EENG0109final.doc

8/14/2019 EENG0109final.doc

1/8

SANTIAGO CAMPUSFINAL EXAM

EE201 (BASIC CIRCUITS 1)

General Direci!n"# (Plea"e rea$ %e&!re '! "ar e e*a+)1, N! -er+i. N! ID. N! E*a+,

2, M!%ile P!ne" !r an' elecr!nic /a$/e" i" n! all!e$ ile e e*a+ i" !n/!in/

, An'!ne ca/ ceain/ in an' &!r+ "all ae 3er! +ar4" in i" e*a+

5, C!ner"ai!n in an' lan/a/e i" -r!i%ie$

6, C!++en !r re-!r !& e a""i/ne$ -r!c!r7" a%! an' n!ar$ inci$en $rin/ e e*a+

a a&&ec" e "c!re i" c!n"i$ere$ &inal an$ n! a--eala%le

8, U"e %le !r %lac4 -en !nl'

9, D! n! rie an'in/ !n e e" :e"i!nnaire

;, Rea$ an$ &!ll! e in"rci!n !& eac '-e !& e" er' care&ll'


2/8

+. *he voltage applie in C circ!it having a power of ' watts an a total resistance of % ohms.

a. ' 3

b. 93

c. 12 3

. 2% 3

9. When resistor are connecte in series& what happens"

a. *he effective resistance

b. 4othing

c. *he tolerance. *he effective resistance is increase

10. 5in the thevenin6s impeance e/!ivalent across 2 of a linear close circ!it having 1073 s!pply in

series with the resistors (18100 ohms an 28200 ohms)

a. ''' ohms

b. '.'' ohms

c. ''.' ohms

. '''' ohms

11. ow m!ch power oes electronic e/!ipment cons!me& ass!ming a #.#A c!rrent flowing an a 12073

power so!rce.

a. '0 W

b. '' W

c. ''0 W. 12#.# W

12. ow many noes are neee to completely analy:e a circ!it accoring to ,irchoffs C!rrent -aw.

a. ;ne

b. *wo

c. All noes in the circ!it

. ;ne less than the total n!mber of noes in the circ!it

1. A common connection between circ!it elements or con!ctors from ifferent branches.

a. 4oe

b.

c. =ro!n

. >esh

1%. $t is !se to enote a common electrical point of :ero potential.

a. ?hort circ!it

b. eference point

c. ;pen circ!it

.gro!n

1#. -oop c!rrents sho!l be ass!me to flow in which irection"

a. ?traight

b. Clocwise

c. Co!nterclocwise

. @ither b or c

1'. $n mesh analysis& we apply

a. ,C-b. ,3-

c. ?o!rce

. >illman6s theorem

1. Which of the following is not a vali expression of ;hms -aw

a. 8 $

b. @ 8 $

c. $ 8 @B

. 8 @B$

1+. sing ohms -aw& what happens to the circ!it c!rrent if the applie voltage increases"

a. C!rrent o!bles

b. C!rrent increases

c. C!rrent remians constant

. C!rrent ecreases

19. Accoring to ohms law& what happen to the circ!it c!rrent if the circ!it resistance increases"

a. C!rrent o!bles

b. C!rrent ecreases

c. C!rrent increases

. C!rrent remains constant


3/8

20. $f the resistance of a circ!it is o!ble an the applie voltage is ept constant& the c!rrent will be

DDDDDDD .

a. Ee /!ar!ple

b. emains

c. Ee c!t in half

. Ee o!ble

21. $t is an electrical c!rrent that flows in one irection only"

a. 4ormal c!rrent

b. Alternating c!rrentc. irect c!rrent

. @y c!rrent

22. $n ;hms -aw& what is @B"

a. Amperage

b. 3oltage

c. esistance

. ower

2. A 7,ohm resistor is connecte in series with a parallel combination mae !p of #'7,ohm resistor

an a .+7ohm resistor. What is the total combine reistance of the three resistors"

a. 90'' ohms

b. %90'9 ohms

c. ''9 ohms. 9#000 ohms

2%. Which of the following cannot be incl!e in a loop of ,irchoff6s 3olatage -aw

a. C!rrent so!rce

b. 3oltage so!rce

c. esistance

. eactance

2#. A series connecte circ!it consists of loas an cons!me a total power of #0 Watts. $t was

reconfig!re s!ch that 2 are in parallel an the other loa is in series with a combination. What is the

applie expecte powers to be cons!me them"

a. #0 watts

b. 2# watts

c. # watts

. %# watts

2'. $f the n!mber of valence electrons of an atom is less than %& the s!bstance is !s!ally

a. ?emicon!ctor

b. An ins!lator

c. A con!ctor

. 4one of the above

2. @lectric c!rrent in a wire is the flow of

a. 5ree electrons

b. 3alence electrons

c. Eo!n electrons

. Atoms2+. @>5 in a circ!it is a form

a. ower

b. @nergy

c. Charge

. none

29. *he ?$ !nit of specific7resistance is

a. >ho

b. ;hm7n

c. ;hm7s/.7m

. ;hm7cm

0. *he resistance of a material is DDD its area of cross7section

a. irectly proportional

b. $nversely proportional

c. $nepenent

. 4one of these


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1. *he val!e of F& i.e.& the temperar!re coefficient of resistance epens !pon the DDDD of the material.

a. -ength

b. 3ol!me

c. G7sectional area

. 4at!re an temperat!re

2. *he val!e of F of a con!ctor is 1B2' C. *he val!e of a F is

a. 1B21+ C

b. 1B22 C

c. 1B2#% C. 1B2'# C

. @lectrical appliances are not connecte in series beca!se

a. ?eries circ!it is complicate

b. ower loss is greater

c. Appliances have ifferent c!rrent rating

. 4one of these

%. @lectrical appliances are connecte in parallel beca!se it

a. $s a simple circ!it

b. es!lts in re!ce power loss

c. raw less c!rrent

. >aes the operation of the appliances inepenent from each other

#. *he hot resistance of a 100W& 2#03 incanecent lamp isa. 2.# ohms

b. '2# ohms

c. 2# ohms

. 4one of these

'. When a n!mber of resistances are connecte in parallel& the total resistance is

a. -ess than the smallest resistance

b. =reater than the smallest resistance

c. Eetween the smallest an greater resistance

. 4one of these

. $f the resistances& each of val!e ' ohms are connecte in parallel& the total resistance is

a. 2 ohms

b. #% ohms

c. ' ohms

. 4one of these

+. *wo incanecent lamps of 100 W& 2003 are in parallel across the 200 3. *he total resistance will be

a. +00 ohms

b. 200 ohms

c. %00 ohms

. '00 ohms

9. *hree resistors are connecte in parallel an raws 1A& 2.#A& an .#A& rspectively. $f the applie

voltage is 2103& what is the total resistance of the circ!it"

a. # ohms

b. 1% ohmsc. ohms

. .# ohms

%0. An orinary ry cell can eliver abo!t DDDD contin!o!sly.

a. A

b. 2 A

c. 1B+ A

. 4one of these

%1. 5o!r cells of internal resistance 1 ohms& are connecte in parallel. *he battery resistance will be

a. % ohms

b. 0.2# ohms

c. 2 ohms

. 1 ohms

%2. ;f the following combination of !nits& the one that is not e/!al to the watt is

a.


5/8

%. *he power issipate in a circ!it is not e/!al to

a. 3$

b. $

c. 3B

. $B3

%%. An electric iron raws a c!rrent of 1#A when connecte to 1203 power so!rce. $ts resistance is

a. 0.12# ohms

b. + ohms

c. 1' ohms. 1&+00 ohms

%#. *he power rating of an electric motor which raws a c!rrent of A when operate at 120 3 is

a. %0 W

b. '0 W

c. #%0 W

. 1&0+0 W

%'. When a 100W& 2%03& light b!lb is operate at 2003& the c!rrent that flows in it is

a. 0.# A

b. 0.%2 A

c. 0.# A

. 0.#+ A

%. *he e/!ivalent resistance of a networ of three 2 ohm resistors cannot bea. 0.' ohms

b. 1.# ohms

c. ohms

. ' ohms

%+. A 123 potential ifference is applie across a series combination of fo!r six7ohms resistors. *he

c!rrent in each six7ohm resistor will be

a. 0.# A

b. 2 A

c. + A

. ' A

%9. A 123 potential ifference is applie across a parallel combination of fo!r six7ohms resistors. *he

c!rrent in each six7ohm resistor will be

a. 0.# A

b. 2 A

c. + A

. ' A

#0. *he issipation of energy can ca!se b!rns beca!se it proce!ces

a. eat

b. 5ire

c. 5riction

. ;verloa

#1. *he rate of expenit!re of energy is

a. 3oltageb. ower

c. C!rrent

. @nergy

#2. $n a simple C power line& the wire that carries the c!rrent from the generator to the loa is calle

a. et!rn wire

b. 5eeer

c. ;!tgoing wire

. Con!ctor

#. A circ!it in which the resistance are connecte in a contin!o!s r!n& i.e.& en7to7en is a DDDDD circ!it.

a. ?aries

b. arallel

c. ?eries7parallel

. 4one of these

#%. A battery is connecte to an external circ!it. *he potential rop with the battery is proportional to

a. *he @>5 of the battery

b. *he c!rrent of the circ!it

c. *he e/!iv/lent circ!it resistance

. ower issipate in the circ!it


6/8

##. *wo wires A an E have the same cross7sectional area an are mae of the same material. a 8 '00

ohms an b 8 100 ohms. *he n!mber of times A is longer tahn E is

a. '

b. 2

c. %

. #

#'. A coil has a resistance of 100 ohms at 90 C. At 100 C& its resistance is 101 ohms. *he temperat!re

coefficient of the wire is

a. 0.01b. 0.1

c. 0.0001

. 0.001

#. *he resistance of a con!ctor oes not epen on its

a. esistivity

b. -ength

c. Cross7section

. >ass

#+. A material which has a negative temperat!re coefficient of resistance is !s!ally aBan

a. $ns!lator

b. Con!ctor

c. ?emi7con!ctor. All of these

#9. Which of the following statements is tr!e both for a series an a parallel c circ!it"

a. ower aitive

b. C!rrent are aitive

c. 3oltage are aitive

. All of these

'0. *wo resistors are sai to be in series when

a. Eoth carry the same val!e of c!rrent

b. *otal c!rrent e/!als the s!m of the branch c!rrent

c. ?!m of $ rops e/!al to @>5

. ?ame c!rrent phases thro!gh both

'1. Accoring to ,C- as applie to a H!ction in a networ of con!ctors.

a. *otal s!m of c!rrents meeting at the H!ction is Iero

b. 4o c!rrent can leave the H!ction witho!t same c!rrent passing thro!hg it

c. 4et c!rrent flow at he H!ction is positive

. Algebraic s!m of the c!rrents meeting at the H!ction is :ero

'2. ,irchoff6s C!rrent -aw is applicable only to

a. Close7loop circ!it

b. @lectronic circ!its

c.

. @lectric circ!it

'. ,irchoff6s 3oltage -asJw is concerne with

a. $ ropsb. Eattery @>56s

c.

. A an b

'%. Accoring to ,3-& the algebraic s!m of all $ rops an @>56s in any close loop of a networ is

always

a. Iero

b. 4egative

c. ositive

. etermine by battery @>5

'#. *he algebraic sign of an $ rops primarily epenent !pon

a. *he amo!nt of c!rrent flowing thro!gh it

b. irection of c!rrent

c. *he val!e of the resistance

. *he battery connection


7/8

''. Choose the wrong statement. $n the noe voltage techni/!e of solvingnetwor parameters& the choice

of the reference noe oes not

a. Affect the operation of the circ!it

b. Change the voltage across the element

c. Alter the potential ifference between any pair of noes

. Affect the volatge of vario!s noes

'. *he noal analysis is primarily base on the application of

a. ,3-

b. ,C-.c. ;hms -aw

. b an c

'+. ?!perposition theorem can be applie only to circ!its having DDDD elements

a. 4on7linear

b. assive

c. -inear bilateral

. esistive

'9. *he s!perposition theorem is essentially base on the concept of

a. eciprocity

b. -inearity

c. non7linearity

. !ality0. What are the electrons in motion calle"

a. C!rrent variation

b. @lectric c!rrent

c. @lectron velocity

. ynamic electricity

1. An active element in a circ!it is one which DDDDD .

a. eceives energy

b. ?!pplies energy

c. a or b

. 4one of these

2. *he siperposition theorem is !se when the circ!it contains

a. A single voltage so!rce

b. A n!mber of voltage so!rce

c. assive element only

. 4one of these

. *hevenin6s theorem is DDDD form of e/!ivalent circ!it.

a. 3oltage

b. C!rrent

c. Eoth a an b

. 4one of these

%. 4orton6s theorem is DDDD form of an e/!ivalent circ!it.

a. 3oltage

b. C!rrentc. Eoth a an b

. 4one of these

#. $n the analysis of vac!!m t!be circ!it& we can generally !se DDDD theorem.

a. 4orton6s

b. *hevenin6s

c. ?!perposition

. eciprocity

'. $n the analysis of transistor circ!its& we generally !se DDDDD theorem.

a. 3oltage

b. C!rrent

c. Eoth a an b

. 4one of these

. ner the conition of >axim!m ower *ransfer& the efficiency is

a. # K

b. 100 K

c. #0 K

. 2# K


8/8

+. *he maxim!m power transfer theorem is !se in

a. @lectronic circ!its

b. ome lightning

c. ower sytem

. 4one of the above

9. eltaBstar or starBelta transformation techni/!e is applie to

a. ;ne terminal

b. *wo terminal

c. *hree terminal. 4one of these

+0. A heater connecte to a 100 3 s!pply& generates 10&000 < of heat energy is 10 sec. ow m!ch time

is neee to generate the same amo!nt of heat when it is !se on 2203 line"

a. # sec

b. 2.# sec

c. .# sec

. % sec.

II, >ORDED PROBLEM,Answer the /!estions given.

1. A battery s!pplies 'A to a series combination of 10L resistor an an !nnown resistance.

When a %L resistance is connecte in parallel across the !nnown resistor& the total c!rrent increases to+A. Calc!late the voltage s!pplie by the so!rce an the val!e of the !nnown resistance.

III, CIRCUIT ANAL?SIS,?olve what is re/!ire.

1. 5in io !sing two of the methos that yo! have learne in this co!rse. (10 pts each sol!tion)

Pre-are$ %'# Cec4e$ %'#

Tir"! Llana$a. ECE En/r, Mar' @ane Laranan/. MSIT. MCP

In"rc!r C!lle/e Dean

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EENG0109final.doc