Kennedy q & a

7/18/2019 Kennedy q & a

http://slidepdf.com/reader/full/kennedy-q-a 1/58

KENNEDY 4th EDITIONMULTIPLE CHOICES

INTRO TO COMMUNICATIONS SYSTEM

1. In a communications system noise is most !i"e!y to a##ect the si$na!

a. at the t%ansmitte%

b. in the channe!c. in the in#o%mation sou%ced. at the &estination

2. In&icate the false statement' (ou%ie% ana!ysis sho)s that a sa)tooth)a*e consist o#

a. #un&amenta! an& su+ha%monic sine )a*esb. a #un&amenta! sine )a*e an& an in#inite num+e% o# ha%monicsc. #un&amenta! an& ha%monic sine )a*es )hose am,!itu&e &ec%eases )ith

the ha%monic num+e%d. sinusoi&a! *o!ta$es some o# )hich a%e sma!! enou$h to i$no%e in

,%actice

3. In&icate the false statement' Mo&u!ation is use& to

a. %e&uce the +an&)i&th use&b. se,a%ate &i##e%in$ t%ansmissionsc. ensu%e that inte!!i$ence may +e t%ansmitte& o*e% !on$ &istancesd. a!!o) the use o# ,%actica+!e antennas

4. In&icate the false statement' (%om the t%ansmitte% the si$na!&ete%io%ation +ecause o# noise is usua!!y

a'un)ante& ene%$yb. ,%e&icta+!e in cha%acte%c. ,%esent in the t%ansmitte%d. &ue to any cause

5. In&icate the true statement' Most %ecei*e%s con#o%ms to the

a. am,!itu&e-mo&u!ate& $%ou,+'#%e.uency-mo&u!ate& $% c. su,e%hete%o&yne $%ou, ou,d. tune& %a&io #%e.uency %ecei*e% $%ou,

6. In&icate the false statement' The nee& #o% mo&u!ation can +est +ee/em,!i#ie& +y the #o!!o)in$'

a. Antenna !en$ths )i!! +e a,,%o/imate!y 014 !on$b. An antenna in the stan&a%& +%oa&cast AM +an& is 23 #tc. A!! soun& is concent%ate& #%om 5 H6 to 5 "H6d. A messa$e is com,ose& o# un,%e&icta+!e *a%iations in +oth am,!itu&e

an& #%e.uency

7/18/2019 Kennedy q & a


7. In&icate the true statement' The ,%ocess o# sen&in$ an& %ecei*in$sta%te& as ea%!y as

a. the mi&&!e 278sb. 29:c. the +e$innin$ o# the t)entieth centu%yd. the 294s

8. ;hich o# the ste,s is not inc!u&e& in the ,%ocess o# %ece,tion<

a. &eco&in$b. enco&in$c. sto%a$ed. inte%,%etation

9. The acoustic channe! is use& #o% )hich o# the #o!!o)in$<

a. UH( communicationsb. sin$!e-si&e+an& communication

c'te!e*ision communicationsd. ,e%son-to-,e%son *oice communications

10. Am,!itu&e mo&u!ation is the ,%ocess o#

a. su,e%im,osin$ a !o) #%e.uency on a hi$h #%e.uencyb. su,e%im,osin$ a hi$h #%e.uency on a !o) #%e.uencyc. ca%%ie% inte%%u,tiond. #%e.uency shi#t an& ,hase shi#t

7/18/2019 Kennedy q & a


NOISE

1. One o# the #o!!o)in$ ty,es o# noise +ecomes o# $%eat im,o%tance at hi$h #%e.uencies' It is the

a. shot noiseb. %an&om noisec. im,u!se noised. t%ansit-time noise

2. In&icate the false statement'

a. H( mi/e%s a%e $ene%a!!y noisie% than H( am,!i#ie%s'b. Im,u!se noise *o!ta$e is in&e,en&ent o# +an&)i&th'c. The%ma! noise is in&e,en&ent o# the #%e.uency at )hich it is

measu%e&'d. In&ust%ia! noise is usua!!y o# the im,u!se ty,e'

3. The *a!ue o# a %esisto% c%eatin$ the%ma! noise is &ou+!e&' The noise ,o)e% $ene%ato% isthe%e#o%e

a. ha!*e&

b. .ua&%u,!e&c. &ou+!e&d. unchan$e&

4. One o# the #o!!o)in$ is not a use#u! .uantity #o% com,a%in$ the noise,e%#o%mance o# %ecei*e%s=

a. In,ut noise *o!ta$eb. E.ui*a!ent noise %esistancec. Noise tem,e%atu%ed. Noise #i$u%e

5. In&icate the noise )hose sou%ce is in a cate$o%y &i##e%ent #%om that o# the othe% th%ee'

a. So!a% noiseb. Cosmic noisec. Atmos,he%ic noised. >a!actic noise

6. In&icate the false statement' The s.ua%e o# the the%ma! noise *o!ta$e$ene%ate& +y a %esisto% is ,%o,o%tiona! to

a. its %esistance

b. its tem,e%atu%ec. ?o!t6mann@s constantd. the +an&)i&th o*e% )hich it is measu%e&

7/18/2019 Kennedy q & a


7. ;hich o# +%oa& c!assi#ications o# noise a%e most &i##icu!t to t%eat<

a. noise $ene%ate& in the %ecei*e%+'noise $ene%ate& in the t%anc. e/te%na!!y $ene%ate& noise smitte%d. inte%na!!y $ene%ate& noise

8. S,ace noise $ene%a!!y co*e%s a )i&e #%e.uency s,ect%um +ut the st%on$estinte%#e%ence occu%s

a. +et)een 9 MH6 an& 2'48 >H6b. +e!o) 5 Mh6c. +et)een 5 to 25 MH6d. a+o*e 2': >H6

9. ;hen &ea!in$ )ith %an&om noise ca!cu!ations it must +e %emem+e%e& that

a. a!! ca!cu!ations a%e +ase& on ,ea" to ,ea" *a!uesb. ca!cu!ations a%e +ase& on ,ea" *a!uesc. ca!cu!ations a%e +ase& on a*e%a$e *a!ues

d. ca!cu!ations a%e +ase& on RMS *a!ues10. ;hich o# the #o!!o)in$ is the most %e!ia+!e measu%ement #o% com,a%in$ am,!i#ie% noisecha%acte%istics<

a'si$na!-to-noib. noise #acto% se %atioc. shot noised. the%ma! noise a$itation

11. ;hich o# the #o!!o)in$ statements is true<

a. Ran&om noise ,o)e% is in*e%se!y ,%o,o%tiona! to +an&)i&thb. (!ic"e% is sometimes ca!!e& demodulation noise c. Noise is mi/e%s is cause& +y ina&e.uate ima$e #%e.uency %eectiond. A %an&om *o!ta$e ac%oss a %esistance cannot +e ca!cu!ate&

7/18/2019 Kennedy q & a


AMPLITUDE MODULATION

1. I# the ,!ate su,,!y *o!ta$e #o% a ,!ate-mo&u!ate& c!ass C am,!i#ie% isV. the ma/imum ,!ate-catho&e *o!ta$e cou!& +e a!most as hi$h as

a. 4Bb. 8Bc. 5Bd. 2B

2. In a !o)-!e*e! AM system am,!i#ie%s #o!!o)in$ the mo&u!ate& sta$e must +e

a. !inea% &e*icesb. ha%monic &e*icesc. c!ass C am,!i#ie%sd. non!inea% &e*ices

3. I# the ca%%ie% o# a 2 ,e%cent mo&u!ate& AM )a*e is su,,%esse& the ,e%centa$e ,o)e% sa*in$ )i!! +e

a. :b. 2:c. 2d. 33'33

4. Lea"-ty,e +ias is use& in a ,!ate-mo&u!ate& c!ass C am,!i#ie% to

a. ,%e*ent tune& ci%cuit &am,in$b. ,%e*ent e/cessi*e $%i& cu%%entc. ,%e*ent o*e%mo&u!ationd. inc%ease the +an&)i&th

5. The out,ut sta$e o# a te!e*ision t%ansmitte% is most !i"e!y to +e a

a. ,!ate-mo&u!ate& c!ass C am,!i#ie%b. $%i&-mo&u!ate& c!ass C am,!i#ie%c. sc%een-mo&u!ate& c!ass C am,!i#ie%d. $%i&-mo&u!ate& c!ass A am,!i#ie%

6. The mo&u!ation in&e/ o# an AM )a*e is chan$e& #%om to 2' The t%ansmitte&,o)e% is

a. unchan$e&b. ha!*e&c. &ou+!e&d. inc%ease +y : ,e%cent

7/18/2019 Kennedy q & a


7. One o# the a&*anta$es o# the +ase mo&u!ation o*e% co!!ecto% mo&u!ation o# a t%ansisto% c!assC am,!i#ie% is

a. the !o)e% mo&u!atin$ ,o)e% %e.ui%e&b. hi$he% ,o)e% out,ut ,e% t%ansisto%c. +ette% e##iciencyd. +ette% !inea%ity

8. A ca%%ie% is simu!taneous!y mo&u!ate& +y t)o sine )a*es )ith mo&u!ation in&ices o# '8 an&

'4 the tota! mo&u!ation in&e/

a. is 2b. cannot +e ca!cu!ate& un!ess the ,hase %e!ations a%e "no)nc. is ':d. is '

9. Am,!itu&e mo&u!ation is use& #o% +%oa&castin$ +ecause

a. it is mo%e noise immune than othe% mo&u!ation systems'b. Com,a%e& )ith othe% systems it %e.ui%es !ess t%ansmittin$ ,o)e%

c. its use a*oi&s %ecei*e% com,!e/ity'd. no othe% mo&u!ation system can ,%o*i&e the necessa%y +an&)i&th #o%hi$h #i&e!ity

10. ;hat is the %atio o# mo&u!atin$ ,o)e% to tota! ,o)e% at 2 ,e%cent mo&u!ation<

a. 2=8b. 2=5c. 5=8d. None o# the a+o*e

7/18/2019 Kennedy q & a


SIN>LE-SIDE?AND TECHNIUES

1. In&icate the false statement %e$a%&in$ the a&*anta$es o# SS? o*e%&ou+!e si&e+an& #u!!-ca%%ie% AM

a. Mo%e channe! s,ace is a*ai!a+!e'b. T%ansmitte% ci%cuits must +e mo%e sta+!e $i*in$ +ette% %ece,tion'c. The si$na! is mo%e noise-%esistant

d. Much !ess ,o)e% is %e.ui%e& #o% the same si$na! st%en$th2. ;hen the mo&u!ation in&e/ o# an AM )a*e is &ou+!e& the antenna cu%%ent is a!so &ou+!e&The AM system +ein$ use& is

a. Sin$!e-si&e+an& #u!! ca%%ie% FH8EG+'Besti$ia! si&e+an& FC8(Gc. Sin$!e-si&e+an& su,,%esse& ca%%ie% F8EGd. Dou+!e-si&e+an& #u!! ca%%ie% FA8EG

3. In&icate )hich one o# the #o!!o)in$ a&*anta$es o# the ,hasecance!!ation metho& o# o+tainin$ SS? o*e% the #i!te% metho& is false=

a. S)itchin$ #%om one si&e+an& to the othe% is sim,!e%'b. It is ,ossi+!e to $ene%ate SS? at any #%e.uency'c. SS? )ith !o)e% au&io #%e.uencies ,%esent can +e $ene%ate&d. The%e a%e mo%e +a!ance& mo&u!ato%s the%e#o%e the ca%%ie% is

su,,%esse& +ette%'

4. The most common!y use& #i!te%s in SS? $ene%ation a%e

a. mechanica!b. RCc. LCd. !o)-,ass

5. In an SS? t%ansmitte% one is most !i"e!y to #in& a

a. c!ass C au&io am,!i#ie%b. tune& mo&u!ato%c. c!ass ? R( am,!i#ie%d. c!ass A R( out,ut am,!i#ie%

6. In&icate in )hich one o# the #o!!o)in$ on!y one si&e+an& is t%ansmitte&'

a. H8Eb. A8Ec. ?9Ed. C8(

7/18/2019 Kennedy q & a


7. One o# the #o!!o)in$ cannot +e use& to %emo*e the un)ante& si&e+an& inSS?' This is the

a. #i!te% systemb. ,hase-shi#t metho&c. thi%& metho&d. +a!ance& mo&u!ato%

8. R8E mo&u!ation is sometimes use& to

a. a!!o) the %ecei*e% to ha*e a #%e.uency synthesi6e%b. sim,!i#y the #%e.uency sta+i!ity ,%o+!em in %ece,tionc. %e&uce the ,o)e% that must +e t%ansmitte&d. %e&uce the +an&)i&th %e.ui%e& #o% t%ansmission

9. To ,%o*i&e t)o o% mo%e *oice ci%cuits )ith the same ca%%ie% it is necessa%y to use

a. IS?b. ca%%ie% inse%tionc. SS? )ith ,i!ot ca%%ie%d. Lincom,e/

10. Besti$a! si&e+an& mo&u!ation FC8(G is no%ma!!y use& #o%

a. H( ,oint-to-,oint communications+'monoau%a! +%oa&cc. TB +%oa&castin$ astin$d. ste%eo +%oa&castin$

7/18/2019 Kennedy q & a


(REUENCY MODULATION

1. In the sta+i!i6e %eactance mo&u!ato% A(C systema. the &isc%iminato% must ha*e a #ast time constant to ,%e*ent

&emo&u!ationb. the hi$he% the &isc%iminato% #%e.uency the +ette% the osci!!ato%

#%e.uency sta+i!ityc. the &isc%iminato% #%e.uency must not +e too !o) o% the system )i!!

#ai!d. ,hase mo&u!ation is con*e%te& into (M +y the e.ua!i6e% ci%cuit

2. In the s,ect%um o# a #%e.uency-mo&u!ate& )a*ea. the ca%%ie% #%e.uency &isa,,ea%s )hen the mo&u!ation in&e/ is !a%$eb. the am,!itu&e o# any si&e+an& &e,en&s on the mo&u!ation in&e/c. the tota! num+e% o# si&e+an&s &e,en&s on the mo&u!ation in&e/d. the ca%%ie% #%e.uency cannot &isa,,ea%

3. The &i##e%ence +et)een ,hase an& #%e.uency mo&u!ationa. is ,u%e!y theo%etica! +ecause they a%e the same in ,%acticeb. is too $%eat to ma"e the t)o system com,ati+!ec. !ies in the ,oo%e% au&io %es,onse o# ,hase mo&u!ationd. !ies in the &i##e%ent &e#initions o# the mo&u!ation in&e/

4. In&icate the false statement %e$a%&in$ the A%mst%on$ mo&u!ation systema. The system is +asica!!y ,hase not #%e.uency mo&u!ationb. A(C is not nee&e& as c%ysta! osci!!ato% is use&'c'(%e.uency mu!ti,!ication mus t +e use&'d. E.ua!i6ation is unnecessa%y

5. An (M si$na! )ith a mo&u!ation in&e/ m # is passed through a frequency

t%i,!e%' The )a*e in the out,ut o# the t%i,!e% )i!! ha*e a mo&u!ation in&e/ o#

a. m#18b. m

#

c. 8md. 7m

#

#

6. An (M si$na! )ith a &e*iation & is ,asse& th%ou$h a mi/e% an& has its #%e.uency %e&uce&#i*e#o!&' The &e*iation in the out,ut o# the mi/e% is

a. :b. In&ete%minatec'1d. :

7. A ,%e-em,hasis ci%cuit ,%o*i&es e/t%a noise immunity +ya. +oostin$ the +ass #%e.uenciesb. am,!i#yin$ the hi$he% au&io #%e.uenciesc. ,%eam,!i#yin$ the )ho!e au&io +an&d. con*e%tin$ the ,hase mo&u!ation to (M

7/18/2019 Kennedy q & a


8. Since noise ,hase-mo&u!ates the (M )a*e as the noise si&e+an& #%e.uencya,,%oaches the ca%%ie% #%e.uency the noise am,!itu&e

a. %emains constantb. is &ec%ease&c. is inc%ease&d. is e.ua!i6e&

9. ;hen the mo&u!atin$ #%e.uency is &ou+!e& the mo&u!ation in&e/ is ha!*e& an& the mo&u!atin$*o!ta$e %emains constant' The mo&u!ation system is

a. am,!itu&e mo&u!ationb. ,hase mo&u!ationc. #%e.uency mo&u!ationd. any o# the th%ee

10. In&icate )hich one o# the #o!!o)in$ is not an a&*anta$e o# (M o*e% AM=a. ?ette% noise immunity is ,%o*i&e&b. Lo)e% +an&)i&th is %e.ui%e&c. The t%ansmitte& ,o)e% is mo%e use#u!d. Less mo&u!atin$ ,o)e% is %e.ui%e&

11. One o# the #o!!o)in$ is an in&i%ect )ay o# $ene%atin$ (M' This is thea. %eactance (ET mo&u!ato%b. *a%acto% &io&e mo&u!ato%c. A%mst%on$ mo&u!ato%d. %eactance +i,o!a% t%ansisto% mo&u!ato%

13. In an (M ste%eo mu!ti,!e/ t%ansmission thea. sum si$na! mo&u!ates 27 "H6 su+ca%%ie%b. &i##e%ence si$na! mo&u!ates the 27 "H6 su+ca%%ie%c. &i##e%ence si$na! mo&u!ates the 89 "H6 su+ca%%ie%d. &i##e%ence si$na! mo&u!ates the 3 "H6 su+ca%%ie%

7/18/2019 Kennedy q & a


RADIO RECEIBERS

1. In&icate )hich o# the #o!!o)in$ statements a+out the a&*anta$es o# the,hase &isc%iminato% o*e% the s!o,e &etecto% is false=

a. Much easie% a!i$nment+'?ette% !inea%ityc. >%eate% !imitin$

d. (e)e% tune& ci%cuits2. Sho) )hich o# the #o!!o)in$ statements a+out the am,!itu&e !imite% isuntrue=

a. The ci%cuit is a!)ays +iase& in c!ass C +y *i%tue o# the !ea"-ty,e+ias'

b. ;hen the in,ut inc%eases ,ast the th%esho!& o# the !imitin$ the $ain&ec%eases to "ee, the out,ut constant'

c. The out,ut must +e tune&d. Lea"-ty,e +ias must +e use&

3. In a %a&io %ecei*e% )ith sim,!e A>Ca. an inc%ease in si$na! st%en$th ,%o&uces mo%e A>Cb. the au&io sta$e $ain is no%ma!!y cont%o!!e& +y the A>Cc. the #aste% the A>C time constant the mo%e accu%ate the out,utd. the hi$hest A>C *o!ta$e is ,%o&uce&

4. In a +%oa&cast su,e%hete%o&yne %ecei*e% the

a. !oca! osci!!ato% o,e%ates +e!o) the si$na! #%e.uencyb. mi/e% in,ut must +e tune& to the si$na! #%e.uencyc. !oca! osci!!ato% #%e.uency is no%ma!!y &ou+!e the I(d. R( am,!i#ie% no%ma!!y )o%"s at 4:: "H6 a+o*e the ca%%ie% #%e.uency

5. To ,%e*ent o*e%!oa&in$ o# the I( am,!i#ie% in a %ecei*e% one shou!& use

a. s.ue!chb. *a%ia+!e sensiti*ityc. *a%ia+!e se!ecti*ityd. &ou+!e con*e%sion

6. A su,e%hete%o&yne %ecei*e% )ith an I( o# 4: "H6 is tune& to a si$na! at 25 "H6' Theima$e #%e.uency is

a. : "H6b. 7 "H6c. 23: "H6d. 52 "H6

7/18/2019 Kennedy q & a


7. In a %atio &etecto%

a. the !inea%ity is )o%se than in ,hase &isc%iminato%b. sta+i!i6ation a$ainst si$na! st%en$th *a%iations is ,%o*i&e&c. the out,ut is t)ice that o+taina+!e #%om a simi!a% ,hase

&isc%iminato%d. the ci%cuit is the same as in a &isc%iminato% e/ce,t that the &io&es

a%e %e*e%se&

8. The ty,ica! s.ue!ch ci%cuit cuts o##

a. an au&io am,!i#ie% )hen the ca%%ie% is a+sentb. R( inte%#e%ence )hen the si$na! is )ea"c. An I( am,!i#ie% )hen the A>C is ma/imumd. An I( am,!i#ie% )hen the A>C is minimum

9. In&icate the false statement in connection )ith communications%ecei*e%s'

a. The noise !imite% cuts o## the %ecei*e%@s out,ut &u%in$ a noise

,u!se'b. A ,%o&uct &emo&u!ato% cou!& +e use& #o% the %ece,tion o# Mo%se co&e'c'Dou+!e con*e%sion is use& to im,%o*e ima$e %eectiond. Ba%ia+!e sensiti*ity is use& to e!iminate se!ecti*e #a&in$

10. The cont%o!!e& osci!!ato% synthesi6e% is sometimes ,%e#e%%e& o*e% the &i%ect one +ecause

a. it is a sim,!e% ,iece o# e.ui,mentb. its #%e.uency sta+i!ity is +ette%c'it &oes not %e.ui%e c%ysta! osci!!ato%d. it is %e!ati*e!y #%ee o# s,u%ious #%e.uency

11. The #%e.uency $ene%ate& +y each &eca&e in a &i%ect #%e.uency synthesi6e% is muchhi$he% than the #%e.uency sho)n this is &one to

a. %e&uce the s,u%ious #%e.uency ,%o+!emb. inc%ease the #%e.uency sta+i!ity o# the synthesi6e%c. %e&uce the num+e% o# &eca&esd. %e&uce the num+e% o# c%ysta!s %e.ui%e&

12. In&icate )hich o# the #o!!o)in$ ci%cuits cou!& not &emo&u!ate SS?=

a. ?a!ance mo&u!ato%b. P%o&uct mo&u!ato%c. ?(Od. Phase &isc%iminato%

7/18/2019 Kennedy q & a


13. I# a (ET is use& as the #i%st A( am,!i#ie% in a t%ansisto% %ecei*e% this )i!! ha*e the e##ect o#

a'im,%o*in$ the e##ecti*eness o# the A>Cb. %e&ucin$ the e##ect o# ne$ati*e-,ea" c!i,,in$c. %e&ucin$ the e##ect o# noise at !o) mo&u!ation &e,thsd. im,%o*in$ the se!ecti*ity o# the %ecei*e%

14. In&icate the false statement' The su,e%hete%o&yne %ecei*e% %e,!ace&the TR( %ecei*e% +ecause the !atte% su##e%e& #%om

a. $ain *a%iation o*e% the #%e.uency co*e%a$e %an$eb. insu##icient $ain an& sensiti*ityc. ina&e.uate se!ecti*ity at hi$h #%e.uenciesd. insta+i!ity

15. The ima$e #%e.uency o# a su,e%hete%o&yne %ecei*e%

a. is c%eate& )ithin the %ecei*e% itse!#b. is &ue to insu##icient a&acent channe! %eectionc. is not %eecte& +e the I( tune& ci%cuits

d. is in&e,en&ent o# the #%e.uency to )hich the %ecei*e% is tune&16. One o# the main #unctions o# the R( am,!i#ie% in a su,e%hete%o&yne %ecei*e% is to

a. ,%o*i&e im,%o*e& t%ac"in$b. ,e%mit +ette% a&acent-channe! %eectionc. inc%ease the tunin$ %an$e o# the %ecei*e%d. im,%o*e the %eection o# the ima$e #%e.uency

17. A %ecei*e% has ,oo% I( se!ecti*ity' It )i!! the%e#o%e a!so ha*e ,oo%

a. +!oc"in$

b. &ou+!e-s,ottin$c. &i*e%sion %ece,tiond. sensiti*ity

18. Th%ee-,oint t%ac"in$ is achie*e& )ith

a. *a%ia+!e se!ecti*ityb. the ,a&&e% ca,acito%c. &ou+!e s,ottin$d. &ou+!e con*e%sion

19. The !oca! osci!!ato% o# a +%oa&cast %ecei*e% is tune& to a #%e.uency hi$he% than the incomin$

#%e.uency

a. to he!, the ima$e #%e.uency %eectionb. to ,e%mit easie% t%ac"in$c. +ecause othe%)ise an inte%me&iate #%e.uency cou!& not +e ,%o&uce&d. to a!!o) a&e.uate #%e.uency co*e%a$e )ithout s)itchin$

7/18/2019 Kennedy q & a


20. I# the inte%me&iate #%e.uency is *e%y hi$h Fin&icate false statementG

a. ima$e #%e.uency %eection is *e%y $oo&b. the !oca! osci!!ato% nee& not +e e/t%eme!y sta+!ec'the se!ecti*ity )i!! +e ,od. t%ac"in$ )i!! +e im,%o*e& o%

21. A !o) %atio o# the ac to the &c !oa& im,e&ance o# a &io&e &etecto% %esu!ts in

a. &ia$ona! c!i,,in$b. ,oo% A>C o,e%ationc. ne$ati*e-,ea" c!i,,in$d. ,oo% A( %es,onse

22. One o# the #o!!o)in$ cannot +e use& to &emo&u!ate SS?=

a. P%o&uct &etecto%b. Dio&e ?a!ance mo&u!ato%c. ?i,o!a% t%ansisto% +a!ance& mo&u!ato%

d. Com,!ete ,hase-shi#t $ene%ato%23. In&icate the false statement' Notin$ that no ca%%ie% is t%ansmitte%)ith 8E )e see that

a. the %ecei*e% cannot use a ,hase com,a%ato% #o% A(Cb. a&acent-channe! %eection is mo%e &i##icu!tc. ,%o&uction o# A>C is a %athe% com,!icate& ,%ocessd. the t%ansmission is not com,ati+!e )ith A8E

24. ;hen a %ecei*e% has $oo& +!oc"in$ ,e%#o%mance this means that

a. it &oes not su##e% #%om &ou+!e-s,ottin$b. its ima$e #%e.uency %eection is ,oo%c. it is una##ecte& +y A>C &e%i*e& #%om nea%+y t%ansmissionsd. its &etecto% su##e%s #%om +u%nout

25. An AM %ecei*e% uses a &io&e &etecto% #o% &emo&u!ation' This ena+!es it satis#acto%i!y to %ecei*e

a. sin$!e-si&e+an& su,,%esse&-ca%%ie%b. sin$!e-si&e+an& %e&uce&-ca%%ie%c. IS?d. Sin$!e-si&e+an& #u!!-ca%%ie%

7/18/2019 Kennedy q & a


TRANSMISSION LINES

1. In&icate the false statement' The S;R on a t%ansmission !ine isin#inity the !ine is te%minate& in

a. a sho%t ci%cuitb. a com,!e/ im,e&ancec. an o,en ci%cuit

d. a ,u%e %eactance2. A F:- j :G-J is connecte& to a coa/ia! t%ansmission !ine o# at 2 >H6' The best metho& o# matchin$ consists in connectin$

a. a sho%t-ci%cuite& stu+ at the !oa&b. an in&uctance at the !oa&c. a ca,acitance at some s,eci#ic &istance

O : J

7/18/2019 Kennedy q & a


d. a sho%t-ci%cuite& stu+ at some s,eci#ic &istance #%om the !oa&

3. The *e!ocity #acto% o# a t%ansmission !ine

a. &e,en&s on the &ie!ect%ic constant o# the mate%ia! use&b. inc%eases the *e!ocity a!on$ the t%ansmission !inec. is $o*e%n +y the s"in e##ectd. is hi$he% #o% a so!i& &ie!ect%ic than #o% ai%

4. Im,e&ance in*e%sion may +e o+taine& )ith

a. a sho%t-ci%cuite& stu+b. an o,en-ci%cuite& stu+c. a .ua%te%-)a*e !ined. a ha!#-)a*e !ine

5. Sho%t-ci%cuite& stu+s a%e ,%e#e%%e& to o,en-ci%cuite& stu+s +ecause the !atte% a%e

a. mo%e &i##icu!t to ma"e an connect+'ma&e o# a t%ansmis

c. !ia+!e to %a&iate sion !ine )ith a &i##e%ent cha%acte%istic im,e&anced. inca,a+!e o# $i*in$ a #u!! %an$e o# %eactances

6. (o% t%ansmission-!ine !oa& matchin$ o*e% a %an$e o# #%e.uencies it is +est to use a

a. +a!unb. +%oa&+an& &i%ectiona! cou,!e%c. &ou+!e stu+d. sin$!e stu+ o# a&usta+!e ,osition

7/18/2019 Kennedy q & a


7. The main &isa&*anta$e o# the t)o-ho!e &i%ectiona! cou,!e% is

a. !o) &i%ectiona! cou,!in$b. ,oo% &i%ecti*ityc. hi$h S;Rd. na%%o) +an&)i&th

8. To cou,!e a coa/ia! !ine to a ,a%a!!e!-)i%e !ine it is +est to use a

a. s!otte& !ineb. +a!unc. &i%ectiona! cou,!e%d. .ua%te%-)a*e t%ans#o%me%

9. In&icate the th%ee ty,es o# t%ansmission !ine ene%$y !osses'

a. I2R R an& tem,e%atu%eL

b. Ra&iation I2R an& &ie!ect%ic heatin$c. Die!ect%ic se,a%ation insu!ation +%ea"&o)n an& %a&iation

d. Con&ucto% heatin$ &ie!ect%ic heatin$ an& %a&iation %esistance'10. In&icate the true statement +e!o)' The &i%ectiona! cou,!e% is

a. a &e*ice use& to connect a t%ansmitte% to a &i%ectiona! antennab. a cou,!in$ &e*ice #o% matchin$ im,e&ancec. a &e*ice use& to measu%e t%ansmission !ine ,o)e%d. an S;R measu%in$ inst%ument

7/18/2019 Kennedy q & a


RADIATION AND PROPA>ATION O( ;ABES

1. In&icate )hich one o# the #o!!o)in$ te%ms a,,!ies to t%o,oscatte% ,%o,a$ation=

a. SIDsb. (a&in$c. Atmos,he%ic sto%msd. (a%a&ay %otation

2. BL( )a*es a%e use& #o% some ty,e o# se%*ices +ecause

a. o# the !o) ,o)e%s %e.ui%e&b. the t%ansmittin$ antennas a%e o# con*enient si6ec. they a%e *e%y %e!ia+!ed. the ,enet%ate the ionos,he%e easi!y

3. In&icate )hich o# the #o!!o)in$ #%e.uencies cannot +e use& #o% %e!ia+!e+eyon&-the-ho%i6on te%%est%ia! communications )ithout %e,eate%s=

a. 5 "H6

b. 2: MH6c. 7 MH6d. 25 >H6

4. Hi$h-#%e.uency )a*es a%ea. a+so%+e& +y the F 2 !aye%

b. %e#!ecte& +y the D !aye%c. ca,a+!e o# use #o% !on$-&istance communications on the moond. a##ecte& +y the so!a% cyc!e

5. Distances nea% the s"i, &istance shou!& +e use& #o% the s"y-)a*e ,%o,a$ation

a. to a*oi& ti!tin$b. to ,%e*ent s"y-)a*e an& u,,e% %ay inte%#e%encec. to a*oi& the (a%a&ay e##ectd. so as no% to e/cee& the c%itica! #%e.uency

6. A shi,-to-shi, communications system is ,!a$ue& +y #a&in$' The +est so!ution seems to+e use o#

a. a mo%e &i%ectiona! antennab. a +%oa&+an& antennac. #%e.uency &i*e%sityd. s,ace &i*e%sity

7/18/2019 Kennedy q & a


7. A %an$e o# mic%o)a*e #%e.uencies mo%e easi!y ,asse& +y the atmos,he%e than a%e theothe%s is ca!!e& a

a. )in&o)b. c%itica! #%e.uencyc. $y%o #%e.uency %an$ed. %esonance in the atmos,he%e

8. (%e.uencies in the UH( %an$e no%ma!!y ,%o,a$ate +y means o#

a. $%oun& )a*esb. s"y )a*esc. su%#ace )a*esd. s,ace )a*es

9. T%o,os,he%ic scatte% is use& )ith #%e.uencies in the #o!!o)in$ %an$e=

a. H(b. BH(c. UH(

d. BL(

10. The $%oun& )a*e e*entua!!y &isa,,ea%s as one mo*es a)ay #%om the t%ansmitte%+ecause o#

a. inte%#e%ence #%om the s"y )a*eb. !oss o# !ine-o#-si$ht con&itionsc'ma/imum sin$!e-ho, &istance !imitationd. ti!tin$

11. In e!ect%oma$netic )a*es ,o!a%i6ation

a'is cause& +y %e#!ectionb. is &ue to the t%ans*e%se natu%e o# the )a*esc. %esu!ts #%om the !on$itu&ina! natu%e o# the )a*esd. is a!)ays *e%tica! in an isot%o,ic me&ium

12. As e!ect%oma$netic )a*es t%a*e! in #%ee s,ace on!y one o# the #o!!o)in$ can ha,,ento them=

a. a+so%,tionb. attenuationc. %e#%actiond. %e#!ection

13. The a+so%,tion o# %a&io )a*es +y the atmos,he%e &e,en&s on

a. thei% #%e.uencyb. thei% &istance #%om the t%ansmitte%c. the ,o!a%i6ation o# the )a*esd. the ,o!a%i6ation o# the atmos,he%e

7/18/2019 Kennedy q & a


14. E!ect%oma$netic )a*es a%e %e#%acte& )hen they

a. ,ass into a me&ium o# &i##e%ent &ie!ect%ic constantb. a%e ,o!a%i6e& at %i$ht an$!es to the &i%ection o# ,%o,a$ationc. encounte% a ,e%#ect!y con&uctin$ ,!aned. ,ass th%ou$h a sma!! s!ot in a con&uctin$ ,!ane

15. Di##%action o# e!ect%oma$netic )a*es

a. is cause& +y %e#!ections #%om the $%oun&b. a%ises on!y )ith s,he%ica! )a*e#%ontsc. )i!! occu% )hen the )a*es ,ass th%ou$h a !a%$e s!otd. may occu% a%oun& the e&$e o# a sha%, o+stac!e

16. ;hen mic%o)a*e si$na!s #o!!o) the cu%*atu%e o# the ea%th this is "no)n as

a'the (a%a&ay e##ectb. &uctin$c. t%o,os,he%ic scatte%d. ionos,he%ic %e#!ection

17. He!ica! antennas a%e o#ten use& #o% sate!!ite t%ac"in$ at BH( +ecause o#

a. t%o,oscatte%b. su,e%%e#%actionc'ionos,he%ic %e#%actiond. the (a%a&ay e##ect

7/18/2019 Kennedy q & a


ANTENNAS

1. An un$%oun&e& antenna nea% the $%oun&

a. acts as a sin$!e antenna o# t)ice the hei$htb. is un!i"e!y to nee& a $%oun& sc%eenc. acts as an antenna a%%ayd. must +e ho%i6onta!!y ,o!a%i6e&

2. One o# the #o!!o)in$ consists o# non%esonant antennas=

a. The %hom+ic antennab. The #o!&e& &i,o!ec. The en&-#i%e a%%ayd. The +%oa&si&e a%%ay

3. One o# the #o!!o)in$ is *e%y use#u! as a mu!ti+an& H( %ecei*in$ antenna' This is the=

a. conica! ho%nb. #o!&e& &i,o!e

c. !o$ ,e%io&icd. s.ua%e !oo,

4. ;hich o# the #o!!o)in$ antennas is +est e/cite& #%om a )a*e$ui&e<

a'?icon ica!b. Ho%nc. He!ica!d. Discone

5. In&icate )hich o# the #o!!o)in$ %easons #o% usin$ a counte%,oise )ithantenna is false=

a. Im,ossi+i!ity o# a $oo& $%oun& connectionb. P%otection o# ,e%sonne! )o%"in$ un&e%$%oun&c. P%o*ision o# an ea%th #o% the antennad. Roc"iness o# the $%oun&

6. One o# the #o!!o)in$ is not a %eason #o% the use o# an antenna cou,!e%=

a. To ma"e the antenna !oo" %esisti*eb. To ,%o*i&e the out,ut am,!i#ie% )ith the co%%ect !oa& im,e&ancec'To &isc%iminate a$ainst ha%monicsd. To ,%e*ent %e%a&iation o# the !oca! osci!!ato%

7. In&icate the antenna that is not )i&e+an&L=

a. Disconeb. (o!&e& Di,o!ec. He!ica!d. Ma%coni

7/18/2019 Kennedy q & a


8. In&icate )hich one o# the #o!!o)in$ %easons #o% the use o# a $%oun&sc%een )ith antennas is false:

a. Im,ossi+i!ity o# a $oo& $%oun& connection+'P%o*ision o# an ea%th #o% the antennac. P%otection o# ,e%sonne! )o%"in$ un&e%neathd. Im,%o*ement o# the %a&iation ,atte%n o# the antenna

9. ;hich one o# the #o!!o)in$ te%ms &oes not a,,!y to the Ya$i-U&a a%%ay<

a. >oo& +an&)i&thb. Pa%asitic e!ementsc. (o!&e& &i,o!ed. Hi$h $ain

10. An antenna that is cu%%ent!y ,o!a%i6e& us the

a. he!ica!b. sma!! ci%cu!a% !oo,

c. ,a%a+o!ic %e#!ecto%d. Ya$i-U&a

11. The stan&a%& %e#e%ence antenna #o% the &i%ecti*e $ain is the a'in#initesima! &i,ob. isot%o,ic antenna !ec. e!ementa%y &ou+!etd. ha!#-)a*e &i,o!e

12. To, !oa&in$ is sometimes use& )ith an antenna in o%&e% to inc%ease its

a. e##ecti*e hei$htb. +an&)i&thc. +eam)i&thd. in,ut ca,acitance

13. Casse$%ain #ee& is use& )ith a ,a%a+o!ic %e#!ecto% to

a. inc%ease the $ain o# the systemb. inc%ease the +eam)i&th o# the systemc. %e&uce the si6e o# the main %e#!ecto%d. a!!o) the #ee& to +e ,!ace& at a con*enient ,oint

14. onin$ is use& )ith a &ie!ect%ic antenna in o%&e% toa. %e&uce the +u!" o# the !enseb. inc%ease the +an&)i&th o# the !ensc. inc%ease ,in-,oint #ocusin$d. co%%ect the cu%*atu%e o# the )a*e#%ont #%om a ho%n that is too sho%t

7/18/2019 Kennedy q & a


15. A he!ica! antenna is use& #o% sate!!ite t%ac"in$ +ecause o# its

a. ci%cu!a% ,o!a%i6ationb. maneu*e%a+i!ityc. +%oa& +an&)i&thd. $oo& #%ont-to-+ac" %atio

16. The &iscone antenna is

a. use#u! &i%ection-#in&in$ antennab. use& as a %a&a% %ecei*in$ antennac. ci%cu!a%!y ,o!a%i6e& !i"e othe% ci%cu!a% antennasd. use#u! as UH( %ecei*in$ antennas

17. One o# the #o!!o)in$ is not an omni&i%ectiona! antenna=

a. Ha!#-)a*e &i,o!eb. Lo$-,e%io&icc. Disconed. Ma%coni

7/18/2019 Kennedy q & a


;ABE>UIDES RESONATORS AND COMPONENTS

1. ;hen an e!ect%oma$netic )a*es a%e ,%o,a$ate& in a )a*e$ui&e a'they t%a*e!

a!on$ a +%oa&e% )a!!s o# the $ui&eb. they a%e %e#!ecte& #%om the )a!!s +ut &o not t%a*e! a!on$ themc. they t%a*e! th%ou$h the &ie!ect%ic )ithout touchin$ the )a!!s

d. they t%a*e! a!on$ a!! #ou% )a!!s o# the )a*e$ui&e2. ;a*e$ui&es a%e use& main!y #o% mic%o)a*e si$na!s +ecause

a. they &e,en& on st%ai$ht-!ine ,%o,a$ation )hich a,,!ies to mic%o)a*eson!y

b. !osses )ou!& +e too hea*y at !o)e% #%e.uenciesc. the%e a%e no $ene%ato%s ,o)e%#u! enou$h to e/cite them at !o)e%

#%e.uenciesd. they )ou!& +e too +u!"y at !o)e% #%e.uencies

3. The )a*e!en$th o# a )a*e in a )a*e$ui&e

a. is $%eate% than o# #%ee s,aceb. &e,en&s on!y on the )a*e$ui&e &imensions an& the #%ee-s,ace

)a*e!en$thc. is in*e%se!y ,%o,o%tiona! to the ,hase *e!ocityd. is &i%ect!y ,%o,otiona! to the $%ou, *e!ocity

4. The main &i##e%ence +et)een the o,e%ation o# t%ansmission !ines an& )a*e$ui&es is that

a. the !atte% a%e not &ist%i+ute& !i"e t%ansmission !inesb. the #o%me% can use stu+s an& .ua%te%-)a*e t%ans#o%me%s un!i"e the

!atte%c. t%ansmission !ines use the ,%inci,a! mo&e o# ,%o,a$ation an&

the%e#o%e &o not su##e% #%om !o)-#%e.uency cut-o##d. te%ms such as impedance matching an& standing-wae ratio cannot +e

a,,!ie& to )a*e$ui&es

5. Com,a%e& )ith e.ui*a!ent t%ansmission !ines 8->H6 )a*e$ui&es Fin&icatefalse statementG

a. a%e !ess !ossy+'can ca%%y hi$hec. a%e !ess +u!"y % ,o)e%s

d. ha*e !o)e% attenuation

7/18/2019 Kennedy q & a


6. ;hen a ,a%ticu!a% mo&e is e/cite& in a )a*e$ui&e th%ee a,,ea%s an e/t%a e!ect%iccom,onent in the &i%ection o# ,%o,a$ation' The %esu!tin$ mo&e is

a. t%ans*e%se-e!ect%icb. t%ans*e%se-ma$neticc. !on$itu&ina!d. t%ans*e%se-e!ect%oma$netic

7. ;hen e!ect%oma$netic )a*es a%e %e#!ecte& at an an$!e #%om a )a!! thei% )a*e!en$th a!on$ the)a!! is

a. the same as in #%ee s,aceb. the same as the )a*e!en$th ,e%,en&icu!a% to the )a!!c. sho%tene& +ecause o# Do,,!e% e##ectd. $%eate% than in the actua! &i%ection o# ,%o,a$ation

8. As a %esu!t o# %e#!ections #%om a ,!ane con&uctin$ )a!! e!ect%oma$netic )a*es ac.ui%ean a,,a%ent *e!ocity $%eate% than the *e!ocity o# !i$ht in s,ace' This is ca!!e& the

a. *e!ocity o# ,%o,a$ation

b. no%ma! *e!ocityc. $%ou, *e!ocityd. ,hase *e!ocity

9. In&icate the false statement' ;hen the #%ee s,ace )a*e!en$th o# asi$na! e.ua!s the cut-o## )a*e!en$th o# the $ui&e

a. the $%ou, *e!ocity o# the si$na! +ecomes 6e%o+'the ,hase *e!ocity o# the si$na! +ecomes in#initec. the cha%acte%istic im,e&ance o# the $ui&e +ecomes in#inited. the )a*e!en$th )ithin the )a*e$ui&e +ecomes in#inite

10. A si$na! ,%o,a$ation in a )a*e$ui&e has a #u!! )a*e o# e!ect%ic intensity chan$e +et)eenthe t)o #u%the% )a!!s an& no com,onent o# the e!ect%ic #ie!& in the &i%ection o# ,%o,a$ation' Themo&e is

a' TE 22

+' TE 2

c' TM 55

&' TE 5

11. The &ominant mo&e o# ,%o,a$ation is ,%e#e%%e& )ith %ectan$u!a%)a*e$ui&es +ecause Fin&icate false statementG

a. it !ea&s to the sma!!est )a*e$ui&e &imensionsb. the %esu!tin$ im,e&ance can +e matche& &i%ect!y to coa/ia! !inesc. it is easie% than the othe% mo&esd. ,%o,a$ation o# it )ithout any s,u%ious $ene%ation can +e ensu%e&

7/18/2019 Kennedy q & a


12. A cho"e #!an$e may +e use& to cou,!e t)o )a*e$ui&es

a. to he!, in the a!i$nment o# the )a*e$ui&es+'+ecause it is sim,!e% than any othe% oinc. to com,ensate #o% &iscontinuities at the oind. to inc%ease the +an&)i&th o# the system

13. In o%&e% to cou,!e t)o $ene%ato%s to a )a*e$ui&e system )ithoutcou,!in$ them to each othe% on cou!& not use a

a. at-%aceb. ! -,!ane Tc. hy+%i& %in$d. ma$ic T

14. ;hich o# the #o!!o)in$ )a*e$ui&es tunin$ com,onents is not easi!ya&usta+!e<

a. Sc%e)b. Stu+

c. I%isd. P!un$e%

15. A ,iston attenuato% is a

a'*ane attenuato%b. )a*e$ui&e +e!o) cuto##c. mo&e #i!te%d. #!a, attenuato%

16. Cy!in&%ica! ca*ity %esonato%s a%e not use& )ith "!yst%ons +ecause they ha*e

a. a " that is too !o)b. a sha,e )hose %esonant #%e.uency is too &i##icu!t to ca!cu!atec. ha%monica!!y %e!ate& %esonant #%e.uenciesd. too hea*y !osses

17. A &i%ectiona! cou,!e% )ith th%ee o% mo%e ho!es is sometimes use& in ,%e#e%ence to the t)o-ho!e cou,!e%

a. +ecause it is mo%e e##icientb. to inc%ease cou,!in$ o# the si$na!c. to %e&uce s,u%ious mo&e $ene%ationd. to inc%ease the +an&)i&th o# the system

18. A #e%%ite is

a. a noncon&ucti*e )ith ma$netic ,%o,e%tiesb. an intemeta!!ic com,oun& )ith ,a%ticu!a%!y $oo& con&ucti*ityc. an insu!ato% )hich hea*i!y attenuates ma$netic #ie!&sd. a mic%o)a*e semicon&ucto% in*ente& +y (a%a&ay

7/18/2019 Kennedy q & a


19. Man$anese #e%%ite may +e use& as a Fin&icate false ans)e%G

a. ci%cu!ato%+'iso!atoc. $a%net %d. ,hase shi#te%

20. The ma/imum ,o)e% that may +e han&!e& +y a #e%%ite com,onent is !imite& +y the

a. Cu%ie tem,e%atu%eb. Satu%ation ma$neti6ationc. !ine )i&thd. $y%oma$netic %esonance

21. A PIN &io&e is

a. a meta! semicon&ucto% ,oint-contact &io&eb. a mic%o)a*e mi/e% &io&ec. o#ten use& as a mic%o)a*e &etecto%d. suita+!e #o% use as a mic%o)a*e s)itch

22. A &u,!e/e% is use&

a. to cou,!e t)o &i##e%ent antennas to a t%ansmitte% )ithout mutua!inte%#e%ence

b. to a!!o) the one antenna to +e use& #o% %ece,tion o% %et%ansmission)ithout mutua! inte%#e%ence

c. to ,%e*ent inte%#e%ence +et)een t)o antennas )hen they a%e connecte&to a %ecei*e%

d. to inc%ease the s,ee& o# the ,u!ses in ,u!ses in ,u!se& %a&a%

23. (o% some a,,!ications ci%cu!a% )a*e$ui&es may +e ,%e#e%%e& to %ectan$u!a% ones

+ecause o#

a'the sma!!e% c%ossb. !o)e% attenuation section nee&e& at any #%e.uencyc. #%ee&om #%om s,u%ious mo&esd. %otation o# ,o!a%i6ation

24. In&icate )hich o# the #o!!o)in$ cannot +e #o!!o)e& +y the )o%& )a*e$ui&e=

a. E!!i,tica!b. (!e/i+!ec. Coa/ia!d. Ri&$e&

7/18/2019 Kennedy q & a


25. In o%&e% to %e&uce c%oss-sectiona! &imensions the )a*e$ui&e to use is

a. ci%cu!a%b. %i&$e&c. %ectan$u!a%d. #!e/i+!e

26. (o% !o) attenuation the +est t%ansmission me&ium is

a. #!e/i+!e )a*e$ui&e+'%i&$e& )a*e$ui&ec. %ectan$u!a% )a*e$ui&ed. coa/ia! !ine

7/18/2019 Kennedy q & a


MICRO;ABE TU?ES AND CIRCUITS

1. A mic%o)a*e tu+e am,!i#ie% uses an a/ia! ma$netic #ie!& an& a %a&ia! e!ect%ic #ie!&' This isthe

a. %e#!e/ "!yst%onb. coa/ia! ma$net%onc. t%a*e!in$-)a*e ma$net%on

d. C(A2. One o# the #o!!o)in$ is un!i"e!y to +e use& as a ,u!se& &e*ice' It is the

a. mu!tica*ity "!yst%onb. ?;Oc. C(Ad. T;T

3. One o# the %easons )hy *acuum tu+es e*entua!!y #ai! at mic%o)a*e #%e.uencies isthat thei%

a. noise #i$u%e inc%easesb. t%ansit time +ecomes too sho%tc. shunt ca,actiti*e %eactances +ecome too !a%$ed. se%ies in&ucti*e %eactances +ecome too sma!!

4. In&icate the false statement' T%ansit time in mic%o)a*e tu+es )i!! +e%e&uce& i#

a. the e!ect%o&es a%e +%ou$ht c!ose% to$ethe%b. a hi$he% ano&e cu%%ent is use&c. mu!ti,!e o% coa/ia! !ea&s a%e use&

d. the ano&e *o!ta$e is ma&e !a%$e%5. The mu!tica*ity "!yst%on

a. is not a $oo& !o)-!e*e! am,!i#ie% +ecause o# noiseb. has a hi$he% %e,e!!e% *o!ta$e to ensu%e a %a,i& t%ansit timec. is not suita+!e #o% ,u!se& o,e%ationd. nee&s a !on$ t%ansit time th%ou$h the +unche% ca*ity to ensu%e

cu%%ent mo&u!ation

6. In&icate the false statement' K!yst%on am,!i#ie%s may use inte%me&iateca*ities to

a. ,%e*ent the osci!!ations that occu% in t)o-ca*ity "!yst%onsb. inc%ease the +an&)i&th o# the &e*icec. im,%o*e the ,o)e% $aind. inc%ease the e##iciency o# the "!yst%on

7/18/2019 Kennedy q & a


7. The T;T is sometimes ,%e#e%%e& to the mu!tica*ity "!yst%on am,!i#ie% +ecause it

a'is mo%e e##icientb. has a $%eate% +an&)i&thc. has a hi$he% num+e% o# mo&esd. ,%o&uces a hi$he% out,ut ,o)e%

8. The t%ansit time in the %e,e!!e% s,ace o# a %e#!e/ "!yst%on must +e n ¾ cyc!es to ensu%e that

a. e!ect%ons a%e acce!e%ate& +y the $a, *o!ta$e on thei% %etu%nb. %etu%nin$ e!ect%ons $i*e ene%$y to the $a, osci!!ationsc. it is e.ua! to the ,e%io& o# the ca*ity osci!!ationsd. the %e,e!!e% is not &ama$e& +y st%i"in$ e!ect%ons

9. The ca*ity ma$net%on uses st%a,,in$ to

a. ,%e*ent mo&e um,in$b. ,%e*ent catho&e +ac"-heatin$c. ensu%e +unchin$

d. im,%o*e the ,hase-#ocusin$ e##ect10. A ma$netic #ie!& is use& in the ca*ity ma$net%on to

a. ,%e*ent ano&e cu%%ent in the a+sence o# osci!!ationb. ensu%e that the osci!!ations a%e ,u!se&c'he!, in #ocusin$ the e!ect%on +eam thus ,%e*entin$ s,%ed. ensu%e that the e!ect%ons )i!! o%+it a%oun& the catho&e

a&in$

11. To a*oi& &i##icu!ties )ith st%a,,in$ at hi$h #%e.uencies the ty,e o# ca*ity st%uctu%e use& in thema$net%on is th

a. ho!e-an&-s!ot

b. s!otc'*aned. %isin$ sun

12. The ,%ima%y ,u%,ose o# the he!i/ in a t%a*e!in$-)a*e tu+e is to

a. ,%e*ent the e!ect%on +eam #%om s,%ea&in$ in the !on$ tu+eb. %e&uce the a/ia! *e!ocity o# the R( #ie!&c. ensu%e +%oa&+an& o,e%ationd. %e&uce the noise #i$u%e

13. The attenuato% is use& in the t%a*e!in$-)a*e tu+e to a'he!, +unchin$b. ,%e*ent osci!!ationsc. ,%e*ent satu%ationd. inc%ease $ain

7/18/2019 Kennedy q & a


14. Pe%io&ic ,e%manent-ma$net #ocusin$ is use& )ith T;Ts to

a. a!!o) ,u!se& o,e%ation+'im,%o*e e!ect%on +unchin$c. a*oi& the +u!" o# an e!ect%oma$netd. a!!o) cou,!e&-ca*ity o,e%ation at the hi$hest #%e.uencies

15. The T;T is sometimes ,%e#e%%e& to the ma$net%on as a %a&a% t%ansmitte% out,ut tu+e +ecauseit is

a. ca,a+!e o# a !on$e% &uty cyc!eb. a mo%e e##icient +an&)i&thc. mo%e +%oa&+an&d. !ess noisy

16. A ma$net%on )hose osci!!atin$ #%e.uency is e!ect%onica!!y a&usta+!e o*e% a )i&e %an$e isca!!e& a

a. coa/ia! ma$net%onb. &ithe%-tune& ma$net%on

c'#%e.d. BTM uency-a$i!e ma$net%on

17. In&icate )hich o# the #o!!o)in$ is not a T;T s!o)-)a*e st%uctu%e=

a. Pe%io&ic-,e%manent ma$netb. Cou,!e& ca*ityc. He!i/d. Rin$-+a%

18. The $!ass tu+e o# a T;T may +e coate& )ith a.ua&a$ to a'he!,

#ocusin$

b. ,%o*i&e attenuationc. im,%o*e +unchin$d. inc%ease $ain

19. A +ac")a%&-)a*e osci!!ato% is +ase& on the

a. %isin$-sun ma$net%onb. c%osse&-#ie!& am,!i#ie%c. coa/ia! ma$net%ond. t%a*e!in$-)a*e tu+e

7/18/2019 Kennedy q & a


SEMICONDUCTOR MICRO;ABE DEBICES AND CIRCUITS

1. A ,a%amet%ic am,!i#ie% must +e coo!e&

a. +ecause ,a%amet%ic am,!i#ication $ene%ates a !ot o# heatb. to inc%ease +an&)i&thc'+ecause it cannot o,e%ate at %oomd. to im,%o*e the noise ,e%#o%mance

tem,e%atu%e

2. A %u+y mase% am,!i#ie% must +e coo!e&a. +ecause mase% am,!i#ication $ene%ates a !ot o# heatb. to inc%ease +an&)i&thc. +ecause it cannot o,e%ate at %oom tem,e%atu%ed. to im,%o*e the noise ,e%#o%mance

3. A &isa&*anta$e o# mic%ost%i, com,a%e& )ith st%i,!ine is that mic%ost%i,

a. &oes not %ea&i!y !en& itse!# to ,%inte& ci%cuit techni.uesb. is mo%e !i"e!y to %a&iatec. is +u!"ie%

d. is mo%e e/,ensi*e an& com,!e/ to manu#actu%e4. The t%ansmission system usin$ t)o $%oun& ,!ane is

a. mic%ost%i,b. e!!i,tica! )a*e$ui&ec. ,a%a!!e!-)i%e !ined. st%i,!ine

5. In&icate the false statement' An a&*anta$e o# st%i,!ine o*e% )*e$ui&eis its

a. sma!!e% +u!"b. $%eate% +an&)i&thc. hi$he% ,o)e%-han&!in$ ca,a+i!ityd. $%eate% com,ati+i!ity )ith so!i&-state &e*ices

6. In&icate the false statement' An a&*anta$e o# st%i,!ine o*e% mic%ost%i,is its

a. easie% inte$%ation )ith semicon&ucto% &e*icesb. !o)e% ten&ency to %a&iatec. hi$he% iso!ation +et)een a&acent ci%cuits

d. hi$he% 7. Su%#ace acoustics )a*es ,%o,a$ate in

a. $a!!ium a%seni&eb. in&ium ,hos,hi&ec. st%i,!ined. .ua%t6 c%ysta!

7/18/2019 Kennedy q & a


8. SA; &e*ices may +e use& as

a. t%ansmission me&ia !i"e st%i,!ineb. #i!te%sc. UH( am,!i#ie%sd. Osci!!ato%s at mi!!imete% #%e.uencies

9. In&icate the false statement' (ETs a%e ,%e#e%%e& to +i,o!a% t%ansisto%s

at the hi$hest #%e.uencies +ecause they

a. a%e !ess noisyb. !en& themse!*es mo%e easi!y to inte$%ationc. a%e ca,a+!e o# hi$he% e##ecienciesd. can ,%o*i&e hi$he% $ains

10. (o% +est !o)-!e*e! noise ,e%#o%mance in the -+an& an am,!i#ie% shou!& use

a. a +i,o!a% t%ansisto%+'a >unn &io&e

c. a ste,-%eco*e%y &io&ed. an IMPATT &io&e

11. The +i$$est a&*anta$e o# the TRAPATT &io&e o*e% the IMPATT &io&e is its

a'!o)e% noiseb. hi$he% e##iciencyc. a+i!ity to o,e%ato% at hi$he% #%e.uenciesd. !esse% sensiti*ity to ha%monics

12. In&icate )hich o# the #o!!o)in$ &io&es )i!! ,%o&uce the hi$hest ,u!se& ,o)e% out,ut=

a. Ba%ato%b. >unnc'Schott"yd. RIMPATT +a%%ie%

13. In&icate )hich o# the #o!!o)in$ &io&es &oes not use ne$ati*e %esistnace in itso,e%ation=

a. ?ac")a%&b. >unnc. IMPATT

d. Tunne!

7/18/2019 Kennedy q & a


14. One o# the #o!!o)in$ is not use& as a mic%o)a*e mi/e% o% &etecto%=

a. C%ysta! &io&eb. Schott"y-+a%%ie% &io&ec. ?ac")a%& &io&ed. PIN &io&e

15. One o# the #o!!o)in$ mic%o)a*e &io&es is suita+!e #o% *e%y !o)-,o)e% osci!!ato%s on!y=

a. Tunne!b. a*a!anchec. >unnd. IMPATT

16. The t%ans#e%%e&-e!ect%on +u!" e##ect occu%s in

a'$e%maniumb. $a!!ium a%seni&ec. si!icond. meta! semicon&ucto% unctions

17. The $ain-+an&)i&th #%e.uency o# a mic%o)a*e t%ansisto% f #%e.uency at )hich the

a. a!,ha o# the t%ansisto% #a!!s +y 8 &?b. +eta o# the t%ansisto% #a!!s +y 8 &?c',o)e% $ain o# the t%ansisto% #a!!s to

unity

d. +eta othet%ansisto%#a!!s tounity

18. (o% a mic%o)a*e t%ansisto% to o,e%ate at the hi$hest #%e.uencies theFin&icate the false ans)e%G

a. co!!ecto% *o!ta$e must +e !a%$e

b. co!!ecto% cu%%ent must +e hi$hc'+ase shou!& +e thind. emitte% a%ea must +e !a%$e

19. A *a%acto% &io&e may +e use#u! at mic%o)a*e #%e.uencies Fin&icate thefalse ans)e%G

a. #o% e!ect%onic tunin$+'#o% #%e.uency mu!c. as an osci!!ato% ti,!icationd. as a ,a%amet%ic am,!i#ie%

7/18/2019 Kennedy q & a


20. I# hi$h-o%&e% #%e.uency mu!ti,!ication is %e.ui%e& #%om a &io&e mu!ti,!ie%

a. the %esisti*e cuto## #%e.uency must +e hi$hb. a sma!! *a!ue o# the +ase %esistance is %e.ui%e&c. a ste,-%eco*e%y &io&e must +e use&d. a !a%$e %an$e o# ca,acitance *a%iation is nee&e&

21. A ,a%amet%ic am,!i#ie% has an in,ut an& out,ut #%e.uency o# 5'5: >H6 an& is ,um,e& at 4':>H6' It is

a. t%a*e!in$-)a*e am,!i#ie%b. &e$ene%ati*e am,!i#ie%c. !o)e%-si&e+an& u,-con*e%te%d. u,,e%-si&e+an& u,-con*e%te%

22. A non&e$ene%ate ,a%amet%ic am,!i#ie% has an in,ut #%e.uency f

,um, #%e.uency f p. #hen idler frequency is

a. f ib. 5f i

c. f i pd. f$ f

p - fi

23. T%a*e!in$-)a*e ,a%amet%ic am,!i#ie%s a%e use& to

a. ,%o*i&e a $%eate% $ainb. %e&uce the num+e% o# *a%acto% &io&es %e.ui%e&c. a*oi& the nee& #o% coo!in$d. ,%o*i&e $%eate% +an&)i&th

24. A,a%amet%icam,!i#ie%sometimeuses a

ci%cu!ato%to

a. ,%e*ennoise#ee&+ac"

b. a!!o) the antenna to +e use& simu!taneous!y #o% t%ansmission an&%ece,tion

c. se,a%ate the si$na! an& i&!e% #%e.uenciesd. ,e%mit mo%e e##icient ,um,in$

25. The non&e$ene%ate one-,o%t ,a%amet%ic am,!i#ie% shou!& ha*e a hi$h %atio o# ,um, tosi$na! #%e.uency +ecause this

a',e%mits satis#acto%y hi$h-b. yie!&s a !o) noise #i$u%e #%e.uency o,e%ationc. %e&uce the ,um, ,o)e% %e.ui%e&d. ,e%mits satis#acto%y

7/18/2019 Kennedy q & a


26. The tunne! &io&e

a. has a tiny ho!e th%ou$h its cente% to #aci!itate tunne!in$+'is a ,oint-contact &io&e )ith a *e%y hi$h %e*e%se %esic. uses a hi$h &o,in$ !e*e! to ,%o*i&e a na%%o) unction stanced. )o%"s +y .uantum tunne!in$ e/hi+ite& +y $a!!ium a%seni&e on!y

27. A tunne! &io&e is !oose!y cou,!e& to its ca*ity in o%&e% to

a. inc%ease the #%e.uency sta+i!ityb. inc%ease the a*ai!a+!e ne$ati*e %esistancec. #aci!itate tunin$d. a!!o) o,e%ation at the hi$hest #%e.uencies

28. The ne$ati*e %esistance in a tunne! &io&e

a. is ma/imum at the ,ea" ,oint o# the cha%acte%isticb. is a*ai!a+!e +et)een the ,ea" an& *a!!ey ,ointsc. is ma/imum at the *a!!ey ,ointd. may +e im,%o*e& +y the use o# %e*e%se +ias

29. The +i$$est a&*anta$e o# $a!!ium antimoni&e o*e% $e%manium #o% tunne!- &io&e use it that#o%me% has a

a. !o)e% noise+'hi$he% ion mo+i!ityc. !a%$e% *o!ta$e s)in$d. sim,!e% #a+%ication ,%ocess

30. Ne$ati*e %esistance is o+taine& )ith a >unn &io&e +ecause o#

a. e!ect%on t%ans#e% to a !ess mo+i!e ene%$y !e*e!

b. a*a!anche +%ea"&o)n )ith the hi$h *o!ta$e $%a&ientc. tunne!in$ ac%oss the unctiond. e!ect%on &omains #o%min$ at the unction

31. (o% >unn &io&es $a!!ium a%seni&e is ,%e#e%%e& to si!icon +ecause the #o%me%

a. has a suita+!e em,ty ene%$y +an& )hich si!icon &oes not ha*eb. has a hi$he% ion mo+i!ityc. has a !o)e% noise at the hi$hest #%e.uenciesd. is ca,a+!e o# han&!in$ hi$he% ,o)e% &ensities

32. The +i$$est &isa&*anta$e o# the IMPATT &io&e is its

a. !o)e% e##iciency than that o# the othe% mic%o)a*e &io&esb. hi$h noisec. ina+i!ity to ,%o*i&e ,u!se& o,e%ationd. !o) ,o)e%-han&!in$ a+i!ity

7/18/2019 Kennedy q & a


33. The ma$netic #ie!& is use& )ith a %u+y mase% to

a. ,%o*i&e sha%, #ocusin$ #o% the e!ect%on +eamb. inc%ease the ,o,u!ation in*e%sionc. a!!o) %oom-tem,e%atu%e o,e%ationd. ,%o*i&e #%e.uency a&ustments

34. The %u+y mase% has +een ,%e#e%%e& to the ammonia mase% #o% mic%o)a*e am,!i#ication+ecause the #o%me% has

a. a much $%eate% +an&)i&thb. a +ette% #%e.uency sta+i!ityc. a !o)e% noise #i$u%ed. no nee& #o% a ci%cu!ato%

35. Pa%amet%ic am,!i#ie%s an& mase%s a%e simi!a% to each othe% in that+oth Fin&icate false statementG

a. must ha*e ,um,in$b. a%e e/t%eme!y !o)-noise am,!i#ie%s

c. must +e coo!e& &o)n to a #e) "e!*insd. $ene%a!!y %e.ui%e& cicu!tato%s since they a%e one-,o%t &e*ices

36. A mase% R( am,!i#ie% is not %ea!!y suita+!e #o%

a. %a&ioast%onomyb. sate!!ite communicationsc. %a&a%d. t%o,oscatte% %ecei*e%

37. The %u+y !ase% &i##e%s #%om the %u+y mase% in that the #o%me%

a. &oes not %e.ui%e ,um,in$b. nee&s no %esonato%c. is an osci!!ato%d. ,%o&uces much !o)e% ,o)e%s

38. The out,ut #%om a !ase% is monoch%omatic this means that it is

a. in#%a%e&b. ,o!a%i6e&c. na%%o)-+eamd. sin$!e-#%e.uency

39. (o% a $i*en a*e%a$e ,o)e% the pea% out,ut ,o)e% o# a %u+y !ase% may+e inc%ease& +y

a'usin$ coo!in$b. usin$ " s,oi!in$c. inc%easin$ the ma$netic #ie!&d. &is,ensin$ )ith the (a+%y-Pe%ot %esonato%

7/18/2019 Kennedy q & a


40. Communications !ase%s a%e use& )ith o,tica! #i+e% %athe% than in o,en !in"s to

a'ensu%e that the +eam &oes not s,% b. ,%e*ent atmos,he%ic inte%#e%ence ea&c. ,%e*ent inte%#e%ence +y othe% !ase%d. ensu%e that ,eo,!e a%e not +!in&e& +y them

41. In&icate the false statement' The a&*anta$es o# semicon&ucto% !ase%so*e% LEDs inc!u&e

a. monoch%omatic out,utb. hi$he% ,o)e% out,utc. !o)e% costd. a+i!ity to +e ,u!se& at hi$he% %ates

7/18/2019 Kennedy q & a


DI>ITAL COMMUNICATIONS

1. Di$ita! si$na!s

a. &o not ,%o*i&e a continuous set o# *a!uesb. %e,%esent *a!ues as &isc%ete ste,sc'can uti!i6e &ecim a! o% +ina%y systemsd. a!! o# the a+o*e

2. The e*ent )hich ma%"e& the sta%t o# the mo&e%n com,ute% a$e )as

a. &esi$n o# the ENIAC com,ute%b. &e*e!o,ment o# the Ho!!e%ith co&ec. &e*e!o,ment o# the t%ansisto%d. &e*e!o,ment o# &is" &%i*es #o% &ata sto%a$e

3. The +au& %ate

a. is a!)ays e.ua! to the +it t%ans#e% %ateb. is e.ua! to t)ice the +an&)i&th o# an i&ea! channe!

c. is not e.ua! to the si$na!in$ %ated. is e.ua! to one-ha!# the +an&)i&th o# an i&ea! channe!

4. The Shannon-Ha%t!ey !a)

a. %e#e%s to &isto%tionb. &e#ines +an&)i&thc. &esc%i+es si$na!in$ %atesd. %e#e%s to noise

5. The co&e )hich ,%o*i&es #o% ,a%ity chec"s is

a. ?au&otb. ASCIIc. E?CDICd. CCITT-5

6. A #o%)a%& e%%o%-co%%ectin$ co&e co%%ects e%%o%s +y

a. %e.ui%in$ ,a%tia! %et%ansmission o# the si$na!b. %e.ui%in$ %et%ansmission o# the enti%e si$na!c. %e.ui%in$ no ,a%t o# the si$na! to +e %et%ansmitte&d. usin$ ,a%ity to co%%ect the e%%o%s in a!! cases

7. (u!! &u,!e/ o,e%ation

a. %e.ui%es t)o ,ai%s o# ca+!esb. can t%ans#e% &ata in +oth &i%ections at oncec'%e.ui%es mo&ems a t +oth en&s o# the ci%cuitd. a!! o# the a+o*e

7/18/2019 Kennedy q & a


8. The RS-585 inte%#ace

a. inte%connects &ata sets an& t%ansmission ci%cuitb. uses se*e%a! &i##e%ent connecto%sc. ,e%mits custom )i%in$ o# si$na! !ines to the connecto% ,ins as

&esi%e&d. a!! o# the a+o*e

9. S)itchin$ systems

a. im,%o*e the e##iciency o# &ata t%ans#e%b. a%e not use& in &ata systemsc. %e.ui%e a&&itiona! !inesd. a%e !imite& to sma!! &ata net)o%"s

10. The &ata t%ansmission %ate o# a mo&em is measu%e& in

a. +ytes ,e% secon&b. +au& %atec. +its ,e% secon&d. me$ahe%t6

7/18/2019 Kennedy q & a


?ROAD?AND CUMMUNICATIONS SYSTEMS

1. ?%oa&+an& !on$-&istance communications )e%e ma&e ,ossi+!e +y the a&*ent o#

a. te!e$%a,h ca+!esb. %e,eate% am,!i#ie%sc. H( %a&id. >eostationa%y sate!!ites

2. A scheme in )hich se*e%a! channe!s a%e inte%!ea*e& an& then t%ansmitte& to$ethe% is "no)n as

a. #%e.uency-&i*ision mu!ti,!e/b. time-&i*ision mu!ti,!e/c. a $%ou,d. a su,e%$%ou,

3. A +asic $%ou, &

a. occu,ies the #%e.uency %an$e #%om 3 to 29 "H6b. consists o# e%ect channe!s on!y

c. is #o%me& at the $%ou, t%ans!atin$ e.ui,mentd. consists o# #i*e su,e%$%ou,s

4. Time-&i*ision mu!ti,!e/

a. can +e use& )ith PCM on!yb. com+ines #i*e $%ou,s into a su,e%$%ou,c. stac"s 54 channe!s in a&acent #%e.uency s!otsd. inte%!ea*es ,u!ses +e!on$in$ to &i##e%ent t%ansmissions

5. The num+e% o# %e,eate%s a!on$ a coa/ia! ca+!e !in" &e,en&s on

a. )hethe% se,a%ate tu+es a%e use& #o% the t)o &i%ections o#t%ansmission

b. the +an&)i&th o# the systemc. the num+e% o# coa/ia! ca+!es in the tu+ed. the se,a%ation o# the e.ua!i6e%s

6. A su,e%$%ou, ,i!ot is

a. a,,!ie& at each mu!ti,!e/in$ +ayb. use& to %e$u!ate the $ain o# in&i*i&ua! %e,eate%sc. a,,!ie& at each a&usta+!e e.ua!i6e%

d. #e& in at a >TE

7/18/2019 Kennedy q & a


7. Mic%o)a*e !in" %e,eate%s a%e ty,ica!!y : "m a,a%t

a. +ecause o# atmos,he%ic attenuation+'+ecause o# out,ut tu+e ,o)e% !imic. +ecause o# the Ea%th@s cu%*atu%e tationsd. to ensu%e that the a,,!ie& &c *o!ta$e is not e/cessi*e

8. Mic%o)a*e !in"s a%e $ene%a!!y ,%e#e%%e& to coa/ia! ca+!e #o% te!e*ision t%ansmission +ecause

a. they ha*e !ess o*e%a!! ,hase &isto%tionb. they a%e chea,e%c. o# thei% $%eate% +an&)i&thsd. o# thei% %e!ati*e immunity to im,u!se noise

9. A%mo%e& su+ma%ine ca+!e is use&

a. to ,%otect the ca+!e at $%eat &e,thsb. to ,%e*ent ina&*e%tent ,!ou$hin$-in o# the ca+!ec. #o% the sha!!o) sho%e en&s o# the ca+!ed. to ,%e*ent insu!ation +%ea"&o)n #%om the hi$h #ee& *o!ta$es

10. A su+ma%ine ca+!e %e,eate% contains amon$ othe% e.ui,ment

a. a &c ,o)e% su,,!y an& %e$u!ato%b. #i!te%s #o% the t)o &i%ections o# t%ansmissionc. mu!ti,!e/in$ an& &emu!ti,!e/in$ e.ui,mentd. ,i!ot inecte& ,i!ot e/t%act e.ui,ment

11. A $eostationa%y sate!!ite

a. is motion!ess in s,ace Fe/ce,t #o% its s,inGb. is not %ea!!y stationa%y at a!! +ut o%+its the Ea%th )ithin a 54-h%

,e%io&c. a,,ea%s stationa%y o*e% the Ea%th@s ma$netic ,o!ed. is !ocate& at a hei$ht o# 8:9 "m to ensu%e $!o+a! co*e%a$e

12. In&icate the co%%ect statement %e$a%&in$ sate!!ite communications'

a. I# t)o ea%th stations &o not #ace a common sate!!ite they shou!&communicate *ia a &ou+!e-sate!!ite ho,'

b. Sate!!ites a%e a!!ocate& so that it is im,ossi+!e #o% t)o ea%thstations not to #ace the same sate!!ite

c. Co!!ocate& ea%th stations a%e use& #o% #%e.uency &i*e%sityd. A sate!!ite ea%th station must ha*e as many %ecei*e chains as the%e

a%e ca%%ie%s t%ansmitte& to it

7/18/2019 Kennedy q & a


13. Sate!!ite use& #o% inte%continenta! communications a%e "no)n as

a. Comsatb. Domsatc. Ma%isatd. Inte!sat

14. I&entica! te!e,hone num+e%s in &i##e%ent ,a%ts o# a count%y a%e &istin$uishe& +y thei%

a. !an$ua$e &i$itsb. access &i$itsc. a%ea co&esd. cent%a! o##ice co&es

15. Te!e,hone t%a##ic is measu%e&

a. )ith echo cance!!e%sb. +y the %e!ati*e con$estionc. in te%ms o# the $%a&e o# se%*iced. in e%!an$s

16. In o%&e% to se,a%ate channe!s in a #D' %ecei*e% it is necessa%y touse

a. AND $atesb. +an&,ass #i!te%sc. &i##e%entiationd. inte$%ation

17. To se,a%ate channe!s in an (DM %ecei*e% it is necessa%y to use

a. AND $ates

b. +an&,ass #i!te%sc. &i##e%entiationd. inte$%ation

18. Hi$he% o%&e% TDM !e*e!s a%e o+taine& +y

a. &i*i&in$ ,u!se )i&thsb. usin$ the a-!a)c. usin$ the Q-!a)d. #o%min$ su,e%maste%$%ou,s

19. Losses in o,tica! #i+e%s can +e cause& +y Fin&icate the false

statementGa. im,u%itiesb. mic%o+en&in$c'attenuation in the $!assd. ste,,e& in&e/ o,e%ation

7/18/2019 Kennedy q & a


20. The 2':: Qm <)in&o)< is not yet in use )ith #i+e% o,tic systems +ecause

a. the attenuation is hi$he% than at '9: Qmb. the attenuation is hi$he% that at 2'8 Qmc'suita+!e !ase% &e*ices ha*e notd. it &oes not !en& itse!# to )a*e yet +een &e*e!o,e&

21. In&icate )hich o# the #o!!o)in$ is not a su+ma%ine ca+!e

a'TAT-b. INTELSAT Bc. ATLANTISd. CANTAT 5

22. In&icate )hich o# the #o!!o)in$ is an Ame%ican &omsat system

a. INTELSATb. COMSATc. TELSTARd. INMARSAT

7/18/2019 Kennedy q & a


RADAR SYSTEMS

1. I# the ,ea" t%ansmitte& ,o)e% in a %a&a% system is inc%ease& +y a #acto% o# 23 thema/imum %an$e )i!! +e inc%ease& +y a #acto%

a. 5b. 4c. 9d. 23

2. I# the antenna &iamete% in a %a&a% system is inc%ease& +y a #acto% o#4. the ma/imum %an$e )i!! +e inc%ease& +y a #acto% o#

a. 5+'5c. 4d. 9

3. I# the %atio o# the antenna &iamete% to the )a*e!en$th in a %a&a%system is hi$h this )i!! %esu!t in Fin&icate the false statementG

a. !a%$e ma/imum %an$eb. $oo& ta%$et &isc%iminationc. &i##icu!t ta%$et ac.uisitiond. inc%ease& ca,tu%e a%ea

4. The %a&a% c%oss section o# a ta%$et Fin&icate the false statementG

a. &e,en&s on the #%e.uency use&b. may +e %e&uce& +y s,ecia! coatin$ o# the ta%$etc. &e,en&s on the as,ect o# a ta%$et i# this nons,he%ica!d. is e.ua! to the actua! c%oss-sectiona! a%ea #o% sma!! ta%$ets

5. (!at-to,,e& %ectan$u!a% ,u!ses must +e t%ansmitte& in %a&a% toFin&icate the false statementG

a'a!!o) a $oo& minimum %an$eb. ma"e the %etu%ne& echoes easie% to &istin$uish #%om noisec. ,%e*ent #%e.uency chan$es in the ma$net%ond. a!!o) accu%ate %an$e measu%ements

6. A hi$h PR( )i!! Fin&icate the false statementG

a. ma"e the %etu%ne& echoes easie% to &istin$uish #%om noiseb. ma"e ta%$et t%ac"in$ easie% )ith conica! scannin$c. inc%ease the ma/imum %an$ed. ha*e no e##ect on the %an$e %eso!ution

7/18/2019 Kennedy q & a


7. The I( +an&)i&th o# a %a&a% %ecei*e% is in*e%se!y ,%o,o%tiona! to the

a. ,u!se )i&thb. ,u!se %e,etition #%e.uencyc. ,u!se inte%*a!d. s.ua%e %oot o# the ,ea" t%ansmitte& ,o)e%

8. I# a %etu%n echo a%%i*es a#te% the a!!ocate& ,u!se inte%*a!

a. it )i!! inte%#e%e )ith the o,e%ation o# the t%ansmitte%b. the %ecei*e% mi$ht +e o*e%!oa&e&c. it )i!! not +e %ecei*e&d. the ta%$et )i!! a,,ea% c!ose% than it %ea!!y is

9. A#te% a ta%$et has +een ac.ui%e& the +est scannin$ system #o% t%ac"in$ is

a. no&&in$b. s,i%a!c. conica!d. he!ica!

10. I# the ta%$et c%oss section is chan$in$ the +est system #o% accu%ate t%ac"in$ is

a. !o+e s)itchin$b. se.uentia! !o+in$c'conica! sc annin$d. mono,u!se

11. The +i$$est &isa&*anta$e o# C; Do,,!e% %a&a% is that

a'it &oes not $i*e the ta%$et *e!oci tyb. it &oes not $i*e the ta%$et %an$e

c. a t%ans,on&e% is %e.ui%e& at the ta%$etd. it &oes not $i*e the ta%$et ,osition

12. The A sco,e &is,!ays

a. the ta%$et ,osition an& %an$eb. the ta%$et %an$e +ut not ,ositionc. the ta%$et ,osition +ut not %an$ed. neithe% %an$e no% ,osition +ut not on!y *e!ocity

13. The Do,,!e% e##ect is use& in Fin&icate the false statementG

a. mo*in$-ta%$et ,!ottin$ on the PPIb. the MTI systemc. (M %a&a%d. C; %a&a%

7/18/2019 Kennedy q & a


14. The coho in MTI %a&a% o,e%ates at the

a. inte%me&iate #%e.uencyb. t%ansmitte& #%e.uencyc. %ecei*e& #%e.uencyd. ,u!se %e,etition #%e.uency

15. The #unction o# the .ua%t6 &e!ay !ine in an MTI %a&a% is to

a. he!, in su+t%actin$ a com,!ete scan #%om the ,%e*ious scanb. match the ,hase o# the coho an& the sta!oc. match the ,hase o# the coho an& the out,ut osci!!ato%d. &e!ay a s)ee, so that the ne/t s)ee, can +e su+t%acte& #%om it

16. A so!ution to the <+!in& s,ee&< ,%o+!em is

a. to chan$e the Do,,!e% #%e.uencyb. to *a%y the PR(c. to use mono,u!sed. to use MTI

17. In&icate )hich one o# the #o!!o)in$ a,,!ications o% a&*anta$es o#%a&a% +eacons is false:

a. Ta%$et i&enti#icationb. Na*i$ationc. Be%y si$ni#icant e/tension o# the ma/imum %an$ed. Mo%e accu%ate t%ac"in$ o# enemy ta%$ets

18. Com,a%e& )ith othe% ty,es o# %a&a% ,hase& a%%ay %a&a% has the#o!!o)in$ a&*anta$es Fin&icate the false statementG

a. *e%y #ast scannin$b. a+i!ity to t%ac" an& scan simu!taneous!yc. ci%cuit sim,!icityd. a+i!ity to t%ac" many ta%$ets simu!taneous!y

7/18/2019 Kennedy q & a


PULSE COMMUNICATIONS

1. In&icate )hich o# the #o!!o)in$ is not a +ina%y co&e

a. Mo%seb. ?au&otc. CCITT-5d. AR

2. To ,e%mit the se!ection o# 2 out o# 23 e.ui-,%o+a+!e e*ents the num+e% o# +its %e.ui%e& is

a. 5b. !o$c'9d. 4

2 23

3. A si$na!in$ system in )hich each !ette% o# the a!,ha+et is %e,%esente& +y a &i##e%ent sym+o! isnot use& +ecause

a. it )ou!& +e too &i##icu!t #o% an o,e%ato% to memo%i6e+'it is %e&un&ant

c. noise )ou!& int%o&uce too many e%%o%sd. too many ,u!ses ,e% !ette% a%e %e.ui%e&

4. The Ha%t!ey states that

a. the ma/imum %ate o# in#o%mation t%ansmission &e,en&s on the channe!+an&)i&th

b. the ma/imum %ate o# in#o%mation t%ansmission &e,en&s on the &e,th o#mo&u!ation

c. %e&un&ancy is essentia!d. on!y +ina%y co&es may +e use&

5. In&icate the false statement' In o%&e% to com+at noise

a. the channe! +an&)i&th may +e inc%ease&b. %e&un&ancy may +e use&c. the t%ansmitte& ,o)e% may +e inc%ease&d. the si$na!in$ %ate may +e %e&uce&

6. The most common mo&u!ation system use& #o% te!e$%a,hy is

a. #%e.uency-shi#t "eyin$b. t)o-tone mo&u!ation

c. ,u!se-co&e mo&u!ationd. sin$!e-tone mo&u!ation

7/18/2019 Kennedy q & a


7. Pu!se-)i&th mo&u!ation system use& #o% te!e$%a,hy is

a. +y &i##e%entiatin$ ,u!se-,osition mo&u!ationb. )ith a monosta+!ec. +y inte$%atin$ the si$na!d. )ith a #%ee-%unnin$ mu!ti*i+%ato%

8. In&icate )hich o# the #o!!o)in$ system is &i$ita!'

a. Pu!se-,osition mo&u!ationb. Pu!se-co&e mo&u!ationc. Pu!se-)i&th mo&u!ationd. Pu!se-#%e.uency mo&u!ation

9. uanti6in$ noise occu%s in

a. time-&i*ision mu!ti,!e/+'#%e.uency &i*ision mu! ti,!e/c. ,u!se-co&e mo&u!ationd. ,u!se-)i&th mo&u!ation

10. The mo&u!ation system inhe%ent!y most noise-%esistant is

a. SS? su,,%esse&-ca%%ie%b. (%e.uency mo&u!ationc',u!se-,osition mo&u!atd. ,u!se-co&e mo&u!ation ion

11. In o%&e% to %e&uce .uanti6in$ noise one must

a. inc%ease the num+e% o# stan&a%& am,!itu&esb. sen& ,u!ses )hose si&es a%e mo%e nea%!y *e%tica!c. use an R( am,!i#ie% in the %ecei*e%d. inc%ease the num+e% o# sam,!es ,e% secon&

12. The Ha%t!ey-Shannon theo%em sets a !imit on the

a'hi$hest #%e.uency that may +e sent o*e% a $i*en channe!b. ma/imum ca,acity o# a channe! )ith a $i*en noise !e*e!c. ma/imum num+e% o# co&in$ !e*e!s in a channe! )ith a $i*en noise !e*e!d. ma/imum num+e% o# .uanti6in$ !e*e!s in a channe! o# a $i*en +an&)i&th

13. In&icate )hich o# the #o!!o)in$ ,u!se mo&u!ation systems is ana!o$

a. PCMb. Di##e%entia! PCMc. P;Md. De!ta

7/18/2019 Kennedy q & a


14. Com,an&in$ is use&

a. to o*e%come .uanti6in$ noise in PCM+'in PCM t%ansmitte%s to a!!o) am,!itu&e !imite& in the %ecec. to ,%otect sma!! si$na!s in PCM #%om .uanti6in$ &isto%tion i*e%sd. in PCM %ecei*e%s to o*e%come im,u!se noise

15. The +i$$est &isa&*anta$e o# PCM is

a. its ina+i!ity to han&!e ana!o$ si$na!sb. the hi$h e%%o% %ate )hich its .uanti6in$ noise int%o&ucesc. its incom,ati+i!ity )ith TDMd. the !a%$e +an&)i&ths that a%e %e.ui%e& #o% it

7/18/2019 Kennedy q & a


TELEBISION (UNDAMENTALS

1. The num+e% o# !ines ,e% #ie!& in the Unite& States TB system is

a. 535b. :5:c. 8d. 3

2. The num+e% o# #%ames ,e% secon& in the Unite& States TB system is

a. 3b. 535c. 4':d. 8

3. The num+e% o# !ines ,e% secon& in the Unite& States TB system is

a. 82:b. 2::

c. 535d. :5:

4. The channe! )i&th in the Unite& States TB system in MH6 is

a. 42'5:b. 3c. 4':d. 8':9

5. Inte%!acin$ is use& in te!e*ision to

a. ,%o&uce the i!!usion o# motionb. ensu%e that a!! the !ines on the sc%een a%e scanne& not me%e!y the

a!te%nate onesc. sim,!i#y the *e%tica! sync ,u!se t%aind. a*oi& #!ic"e%

6. The si$na!s sent +y the TB t%ansmitte% to ensu%e co%%ect scannin$ in the %ecei*e% a%e ca!!e&

a. syncb. ch%omac. !uminance

d. *i&eo

7/18/2019 Kennedy q & a


7. In the Unite& States co!o% te!e*ision system the intercarrier #%e.uency in MH6 is

a. 8':9b. 8':74:c. 4':d. 4:':

8. In&icate )hich *o!ta$es a%e not #oun& in the out,ut o# a no%ma!monoch%ome %ecei*e% *i&eo &etecto%'

a. Syncb. Bi&eoc. S)ee,d. Soun&

9. The ca%%ie% t%ansmitte& 2'5: MH6 a+o*e the +ottom #%e.uency in the Unite& States TBchanne! is the

a. soun& ca%%ie%b. ch%oma ca%%ie%

c. inte%ca%%ie%d. ,ictu%e ca%%ie%

10. In te!e*ision 4=8 %e,%esents the

a. inte%!ace %atio+'ma/imum ho%i6 onta! &e#!ectionc. as,ect %atiod. %atio o# the t)o &ia$ona!s

11. E.ua!i6in$ ,u!ses in TB a%e sent &u%in$

a. ho%i6onta! +!an"in$b. *e%tica! +!an"in$c. the se%%ationsd. the ho%i6onta! %et%ace

12. An o&& num+e% o# !ines ,e% #%ame #o%ms ,a%t o# e*e%y one o# the )o%!&@s TB systems'This is

a. &one to assist inte%!aceb. ,u%e!y an acci&entc. to ensu%e that !ine an& #%ame #%e.uencies can +e o+taine& #%om the

same o%i$ina! sou%ced. &one to minimi6e inte%#e%ence )ith the ch%oma su+ca%%ie%

7/18/2019 Kennedy q & a


13. The #unction o# the serrations in the com,osite *i&eo )a*e#o%m is to

a. e.ua!i6e the cha%$e in the inte$%ato% +e#o%e the sta%t o# *e%tica!%et%ace

b. he!, *e%tica! synch%oni6ationc. he!, ho%i6onta! synch%oni6ationd. sim,!i#y the $ene%ation o# the *e%tica! sync ,u!se

14. The )i&th o# the *e%tica! sync ,u!se in the Unite& States TB system is

a'5b. 8( 2Hc. ( d. ':(

15. In&icate )hich o# the #o!!o)in$ #%e.uencies )i!! not +e #oun& in theout,ut o# a no%ma! TB %ecei*e% tune%=

a. 4': MH6b. 42'5: MH6

c. 4:': MH6d. 45'2 MH6

16. The *i&eo *o!ta$e a,,!ie& to the ,ictu%e tu+e o# a te!e*ision %ecei*e% is #e& in

a. +et)een $%i& an& $%oun&b. to the yo"ec. to the ano&ed. +et)een $%i& an& catho&e

17. The ci%cuit that se,a%ates sync ,u!ses #%om the com,osite *i&eo )a*e#o%m is

a. the "eye& A>C am,!i#ie%b. a c!i,,e%c. an inte$%ato%d. a &i##e%entiato%

18. The out,ut o# the *e%tica! am,!i#ie% a,,!ie& to the yo"e in a TB %ecei*e% consists o#

a. &i%ect cu%%entb. am,!i#ie& *e%tica! syncc. a sa)tooth *o!ta$ed. a sa)tooth cu%%ent

7/18/2019 Kennedy q & a


19. The HB ano&e su,,!y #o% the ,ictu%e tu+e o# a TB %ecei*e% is $ene%ate& in the

a. mains t%ans#o%me%b. *e%tica! out,ut sta$ec. ho%i6onta! out,ut sta$ed. ho%i6onta! &e#!ection osci!!ato%

20. Anothe% name #o% the ho%i6onta! %et%ace in a TB %ecei*e% is the

a. %in$in$b. +u%stc. &am,e%d. #!y+ac"

21. In&icate )hich o# the #o!!o)in$ si$na!s is not t%ansmitte& in co!o%TB=

a. )

b. "

c. R

d. I

22. The shadow mas% in a co!o% ,ictu%e tu+e is use& to

a'%e&uce /-%ay emissionb. ensu%e that each +eam hits on!y its o)n &otsc. inc%ease sc%een +%i$htnessd. ,%o*i&e &e$aussin$ #o% the sc%een

23. In a TB %ecei*e% the color %iller

a. cuts o## the ch%oma sta$es &u%in$ monoch%ome %ece,tion

b. ensu%es that no co!o% is t%ansmitte& to monoch%ome %ecei*e%sc. ,%e*ents co!o% o*e%!oa&in$d. ma"es su%e that the co!o% +u%st is not mista"en #o% sync ,u!ses +y

cuttin$ o## %ece,tion &u%in$ the +ac" ,o%ch

7/18/2019 Kennedy q & a


INTRODUCTION TO (I?ER OPTIC TECHNOLO>Y

1. ;hat is the #%e.uency !imit o# co,,e% )i%e<

a'a,,%o/imate!y ': MH6b. a,,%o/imate!y 2' MH6c. a,,%o/imate!y 4 >H6d. None o# the a+o*e

2. A,,%o/imate!y )hat is the #%e.uency !imit o# the o,tica! #i+e%<

a. 5 >H6b. 2 MH6c. 2 MH6d. 4 MH6

3. A sin$!e #i+e% can han&!e as many *oice channe! as

a. a ,ai% o# co,,e% con&ucto%sb. a 2:-,ai% ca+!e

c. a :-,ai% ca+!ed. a 2-,ai% ca+!e

4. An inci&ent %ay can +e &e#ine& as

a. a !i$ht %ay %e#!ecte& #%om a #!at su%#aceb. a !i$ht %ay &i%ecte& to)a%& a su%#acec. a &i##use& !i$ht %ayd. a !i$ht %ay that ha,,ens ,e%io&ica!!y

5. The te%m dispersion &esc%i+es the ,%ocess o#

a. se,a%atin$ !i$ht into its com,onent #%e.uenciesb. %e#!ectin$ !i$ht #%om a smooth su%#acec. the ,%ocess +y )hich !i$ht is a+so%+e& +y an une*en %ou$h su%#aced. !i$ht scatte%in$

6. ;hich o# the #o!!o)in$ te%ms &esc%i+es the %eason that !i$ht is %e#%acte& at &i##e%entan$!es<

a. Photon ene%$y chan$es )ith )a*e!en$thb. Li$ht is %e#%acte& as a #unction o# su%#ace smoothnessc. The an$!e is &ete%mine& ,a%t!y +y a an& b

d. The an$!e is &ete%mine& +y the in&e/ o# the mate%ia!s

7/18/2019 Kennedy q & a


7. The te%m c%itica! an$!e &esc%i+es

a. the ,oint at )hich !i$ht is %e#%acte&+'the ,oint at )hich !i$ht +ecomes in*isi+!ec. the ,oint at )hich !i$ht has $one #%om the %e#%acti*e mo&e to the

%e#!ecti*e mo&ed. the ,oint at )hich !i$ht has c%osse& the +oun&a%y !aye%s #%om one

in&e/ to anothe%

8. The c!a&&in$ )hich su%%oun&s the #i+e% co%e

a. is use& to %e&uce o,tica! inte%#e%enceb. is use& to ,%otect the #i+e%c. acts to he!, $ui&e the !i$ht in the co%ed. ensu%es that the %e#%acti*e in&e/ %emains constant

9. The %e#!ecti*e in&e/ num+e% is

a. a num+e% )hich com,a%es the t%ans,a%ency o# a mate%ia! )ith that o#ai%

b. a num+e% assi$ne& +y the manu#actu%e% to the #i+e% in .uestionc. a num+e% )hich &ete%mines the co%e &iamete%d. a te%m #o% &esc%i+in$ co%e e!asticity

10. The te%ms single mode an& multimode a%e +est &esc%i+es as

a. the num+e% o# #i+e%s ,!ace& into a #i+e%-o,tic ca+!e+'the num+e% o# *oice channe!s each #i+e% can su,,oc. the num+e% o# )a*e!en$ths each #i+e% can su,,o%td. the in&e/ num+e%

%t

11. The hi$he% the in&e/ num+e%

a. the hi$he% the s,ee& o# !i$htb. the !o)e% the s,ee& o# !i$htc. has no e##ect on the s,ee& o# !i$htd. the sho%te% the )a*e!en$th ,%o,a$ation

12. The th%ee mao% $%ou,s in the o,tica! system a%e

a. the com,onents the &ata %ate an& %es,onse timeb. the sou%ce the !in" an& the %ecei*e%c'the t%ansmitte% the ca+!e an& the %ecd. the sou%ce the !in" an& the &etecto% ei*e%

13. As !i$ht is cou,!e& in a mu!ti,oint %e#!ecti*e &e*ice the ,o)e% is %e&uce& +y

a. 2': &?+''2 &?c. ': &?d. '2 &?

7/18/2019 Kennedy q & a


14. ;hen connecto% !osses s,!ice !osses an& cou,!e% !osses a%e a&&e& )hat is the #ina!!imitin$ #acto%<

a. Sou%ce ,o)e%b. (i+e% attenuationc. Connecto% an& s,!ice !ossesd. Detecto% sensiti*ity

15. The te%m responsiity as it a,,!ies to a !i$ht &etecto% is +est&esc%i+e& as

a. the time %e.ui%e& #o% the si$na! to $o #%om 2 to 7 ,e%cent o#ma/imum am,!itu&e

b. the %atio o# the &io&e out,ut cu%%ent to o,tica! in,ut ,o)e%c. the %atio o# out,ut cu%%ent to out,ut ,o)e%d. the %atio o# out,ut cu%%ent to in,ut cu%%ent

16. Loss com,a%isons +et)een #usion s,!ices an& mechanica! s,!ices a%e

a. 2=2b. 2=2c. 5=2d. 2=5

17. The mechanica! s,!ice is +est suite& #o%

a. .uic"e% insta!!ation un&e% i&ea! con&itionsb. minimum attenuation !ossesc. #ie!& se%*ice con&itionsd. situations in )hich cost o# e.ui,ment is not a #acto%

18. EMD is +est &esc%i+e +y )hich statement<

a. ,e%cent o# the co%e &iamete% an& o# the #i+e% NA shou!& +e#i!!e& )ith !i$ht

b. ,e%cent o# the #i+e% &iamete% an& o# the cone o# acce,tanceshou!& +e #i!!e& )ith !i$ht

c. ,e%cent o# in,ut !i$ht shou!& +e measu%e& at the out,utd. ,e%cent o# the un)ante& )a*e!en$ths shou!& +e attenuate& +y the

#i+e%

19. ;hich o# the #o!!o)in$ ca+!es )i!! ha*e the hi$hest !aunch ,o)e% ca,a+i!ity<

a. :125:1'5b. 9:125:1'5:c'35':125:1'5d. 21241'8 :

7/18/2019 Kennedy q & a


20. The te%m power budgeting %e#e%s to

a. the cost o# ca+!es connecto%s e.ui,ment an& insta!!ation+'the !oss o# ,o)e% &ue to &e#ecti*e com,onentsc. the tota! ,o)e% a*ai!a+!e minus the attenuation !ossesd. the com,a%ati*e costs o# #i+e% an& co,,e% insta!!ations

Documents

Kennedy q & a