UGC NET Solutions at targetIES.pdf

8/13/2019 UGC NET Solutions at targetIES.pdf

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Solutions: Click Here

Quiz & Solution for UGC NET Electronics Science Exams About the NET
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1. An electron rising through a potential of 250 V will acquire an energy of :

a. 250 eV

b. 800 eV

c. 250 J

d. 800 J

2. If the amount of impurity, either donor type or acceptor type added tothe intrinsic semiconductor is controlled to 1 part in one million, the conductivity of thesample :

a. increases by a factor 10e3

b. reduces by a factor 10e-3

c. increases by a factor 10e6

d. reduces by a factor 10e-6

3. The fourier transform of a function on X (t) is X ( f ). The fourier transform of dX ( f )/df willbe :

a. dX ( f )/df

b. j 2p f x ( f )

c. j f x ( f )

d. X ( f )/jf

4. Laplace transform and Fourier integrals are related through :

a. frequency domain

b. time domain

c. both frequency and time domain

d. none

5. A clamper circuit :(i) adds or subtracts a dc voltage to or from a waveform(ii) does not change the shape of the waveform(iii) amplifies the waveform

a. (i) and (ii) are correct

b. (i) and (iii) are correct

c. (ii) and (iii) are correct

d. (i), (ii) and (iii) are correct

6. The amplifier gain with positive feedback is given by :

a. A/1+A
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Solutions: Click Here b. A/1-A

c. A/1-

/1-A

7. A ring counter consisting of five flip flop will have :

a. 5 states

b. 10 states

c. 32 states

d. infinite states

8. Which one of the following can be used as parallel to series converter ?

a. Decoder

b. Encoder

c. Digital counter

d. Multiplexer

9. An interrupt in which the external device supplies its address as well as the interruptrequest, is known as :

a. vectored interrupt

b. maskable interrupt

c. polled interruptd. non-maskable interrupt

10. In 8085 microprocessor, the value of the most significant bit of the result following theexecution of any arithmetic of Boolean instruction is stored in the :

a. carry status flag

b. auxiliary carry status flag

c. sign status flag

d. zero status flag

11. An instruction that can be recognized and used without translation must be written in :

a. Source code

b. Machine code

c. Basic language

d. Assembly code

12. What is the name of the arrangement where by several central processing units share onememory ?

a. Multitasking


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Solutions: Click Here b. Multiprogramming

c. Multiprocessing

d. Concurrent programming

13. The angle for which there is no reflection and the incident wave is vertically polarized isknown as :

a. Steradian angle

b. Reflection angle

c. Brewsters angle

d. Critical angle

14. The characteristic impedance of a transmission line is given by :

a.

b.

c.

d.

15. A PLL can be used to demodulate :

a. PAM signals

b. PCM signals

c. PM signals

d. DSB-SC signals

16. The main function of balanced modulator is to :

a. produce balanced modulation of a carrier waveb. produce 100 percent modulation

c. suppress carrier signal in order to create a single side band or double side band

d. limit noise picked up a receiver

17. An SCR can be termed as :

a. DC switch

b. AC switch

c. Both DC and AC switchd. Square wave switch
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18. Fiber optics communication offers the largest bandwidth in the range of :

a. 10e10

b. 10e6

c. 10e14

d. 10e20

19. Silicon photosensors have their maximum spectral response in the :

a. infrared region

b. ultraviolet region

c. visible region

d. X-ray region

20. Open loop transfer function is given by the system is ::

a. is stable

b. is unstable

c. is marginally stable

d. is absolutely stable

21. Match List-I with List-II and select the correct answer using the codes given below the lists :List-I List-II

(a) Zener Diode (i) Negative resistance(b) Tunnel Diode (ii) High current gain(c) Gunn diode (iii) voltage regulation(d) PIN diode (iv) High input impedance

a. (iii) (i),(ii) (iv) (i)

b (iv) (ii),(iv) (iv) (i)

c. (iv) (i),(iii),(iv) (i) (iii)

d. (iii) (i),(ii),(iv) (iv) (i)

22. Match List-I and List-II and select the correct answer using the codes given below the lists :List-I List-II

(a) Venturi tube (i) Displacement(b) Optical tachometer (ii) Pressure(c) LVDT (iii) Flow(d) Pirani Gauge (iv) Velocity

a. (i) (iv) (iii) (ii)
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Solutions: Click Here b. (iii) (ii) (i) (iv)

c. (i) (ii) (iii) (iv)

d. (iii) (iv) (i) (ii)

23. Match List-I with List-II and select the correct answer using the codes given below the lists :List-I List-II

(a) Frequency Modulation (i) Envelop detection(b) Double sideband suppressed carrier signal (ii) Companding(c) PCM (iii)Balance Modulator(d) Amplitude Modulation (iv) Pre-emphasis and

deemphasis

a. (i) (ii) (iii) (iv)

b. (i) (ii) (iv) (iii)

c. (iv) (iii) (i) (ii)

d. (iv) (iii) (ii) (i)


(With respect to Magnetron (With respect to Magnetron peakaverage o/p power, dyty cycle) o/p power in Watts)

(a) 25 W (i) 6250(b) 50 W (ii) 5000(c) 100 W (iii) 2500(d) 150 W (iv) 1250

a. (iv) (iii) (ii) (i)

b. (iii) (iv) (ii) (i)


d. (iv) (iii) (i) (ii)


(a) AND (i) ||(b) OR (ii) =!(c) NOT (iii) &&(d) NOT EQUAL (iv) !

a. (ii) (iii) (i) (iv)

b. (iii) (i) (iv) (ii)

c. (iv) (iii) (ii) (i)

d. (i) (ii) (iii) (iv)


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(Status flag w.r.t 8085) (Bit position)(a) Auxillary carry (i) 7

(b) Gign (ii) 6(c) Zero (iii) 4(d) Parity (iv) 2

a. (i) (ii) (iii) (iv)

b. (ii) (iii) (i) (iv)


d. (iii) (i) (iv) (ii)


(a) Solar Cell (i) Spontaneous emission(b) LED (ii) Stimulated emission(c) Laser (iii) Photovoltaic conversion(d) Reflex Klystron (iv) Velocity modulation

a. (iii) (i) (ii) (iv)

b. (i) (ii) (iii) (iv)

c. (ii) (iii) (iv) (i)

d. (iv) (i) (ii) (iii)


(a) ROM (i) Volatile memory(b) RAM (ii) Non-volatile memory(c) Magnetic Memory (iii) Erasable Programmable Read Only Memory(d) EPROM (iv) Permanent memory

a. (i) (ii) (iv) (iii)

b. (ii) (i) (iv) (iii)

c. (iii) (i) (ii) (iv)

d. (iv) (iii) (ii) (i)


(a) Bit (i) 16 bit(b) Byte (ii) 1 bit


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Solutions: Click Here (c) Nibble (iii) 4 bit(d) 8086 (iv) 8 bit

a. (ii) (iv) (iii) (i)

b. (i) (iii) (ii) (iv)c. (iv) (ii) (i) (iii)

d. (iii) (iv) (ii) (i)


With respect to copper film Surface resistancethickness (A ),resistivity ( - cm107) ( / Square)

(a) 100, 0.52 (i) 7.25(b) 80, 0.58 (ii) 21.50(c) 60, 0.68 (iii) 5.20(d) 40, 0.86 (iv) 11.33

a. (ii) (iii) (i) (iv)

b. (iii) (i) (iv) (ii)

c. (iv) (i) (iii) (ii)

d. (i) (ii) (iii) (iv)

31. Assertion (A): Silicon is widely used in IC technology.Reason (R): Silicon technology is less expensive and SiO2 layer can be easily formed on silicon.

a. Both (A) and (R) true and (R) is the correct explanation of (A)

b. Both (A) and (R) true but (R) is not the correct explanation of (A)

c. (A) is true but (R) is false

d. (A) is false but (R) is true

32. Assertion (A) : The greater the Q the smaller the bandwidth of a resonant circuit. Reason (R) : At high frequencies the Q of a co il falls due to skin effect.





33. Assertion (A) : In an Op-Amp circuit when one input terminal of the Op-Amp is grounded,the other terminal becomes virtual ground.Reason (R) : Input impedance of the Op-Amp is high.




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Solutions: Click Here b. Both (A) and (R) true but (R) is not the correct explanation of (A)



40. Assertion (A) : Piezoelectric crystals serve as a source of ultrasonic wave.Reason (R) : The crystals can generate wave having frequencies greater than 20 kHz.





41. Give sequence of the following interrupts on priority basis from highest to the lowest :(i) RST 5.5(ii) RST 6.5(iii) RST 7.5(iv) TRAP

a. (i), (ii), (iii), (iv)

b. (ii), (iii), (i), (iv)

c. (iii), (ii), (iv), (i)

d. (iv), (iii), (ii), (i)

42. The highest data rate can be transmitted using the following cables :(i) Twisted-wire cable(ii) Co-axial cable(iii) Fiber-optic cable

a. (iii), (ii), (i)

b. (i), (iii), (ii)

c. (ii), (i), (iii)

d. (i), (ii), (iii)

43. Write down the different computer network from lowest to the highest order :(i) LAN

(ii) WAN (iii) MAN

a. (ii), (i), (iii)

b. (iii), (i), (ii)

c. (i), (ii), (iii)

d. (i), (iii), (ii)

44. Consider the following rectifier circuits :(i) Half-wave rectifier without filter

(ii) Full-wave rectifier without filter(iii) Full-wave rectifier with series inductance filter(iv) Full-wave rectifier with capacitance filter


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Solutions: Click Here The sequence of these rectifier circuits in decreasing order of their ripple factor is :

a. (iii), (iv), (i), (ii)

b. (i), (iv), (iii), (ii)

c. (iii), (ii), (i), (iv)

d. (i), (ii), (iii), (iv)

45. What is the correct sequence of the following steps for fabrication of monolithic, bipolar junction transistor ?(i) Emitter diffusion(ii) Base diffusion(iii) Buried layer formation(iv) Epilayer formation

a. (iii), (iv), (i), (ii)

b. (iv), (iii), (i), (ii)

c. (iii), (iv), (ii), (i)

d. (iv), (iii), (ii), (i)

Linked Items

[Read the passage below and answer the questions that follow based on your understanding of thepassage]Cathode ray oscilloscope is an electronic device which gives a visual representation of electrical

quantities such as voltage and current waveforms in an electrical circuit. The name cathode ray isgiven because the electron beam was first thought to consists of rays from the cathode. A CROconsists of the Cathode Ray Tube (CRT), power supplies, time base circuit and deflection voltageamplifiers. The heart of cathode ray oscilloscope is CRT. Its chief advantage is that it produces thevisual representation directly with extremely high speed because of the high velocity of electrons.

46. The oscilloscope can be considered as a :

a. low impedance instrument

b. high impedance instrument

c. medium impedance instrumentd. infinite impedance instrument

47. Sawtooth waves are used most frequently to move the electron beam in an oscilloscope :

a. back and forth across the screen

b. up and down on the screen

c. back and down on the screen

d. none of the above

48. The deflection sensitivity of a CRT depends inversely on the :


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Solutions: Click Here a. length of the vertical deflecting plates

b. distance between screen and deflecting plates

c. deflecting voltage

d. separation between Y plates

49. Two complete signal cycles would be displaced on the screen scope when time period ofthe sweep generator is __________ the signal time period.

a. half

b. twice

c. equal

d. thrice

50. An electrostatic cathode ray oscilloscope is a :

a. current indicating device

b. voltage indicating device

c. Both (A) and (B) above

d. None of the above


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Solutions: Click Here 1. The threshold voltage of an n-channel MOSFET can be increased by :

a. increasing the channel dopoint concentration

b. decreasing the channel dopoint concentration

c. reducing the gate oxide thickness

d. reducing the channel length

2. The potential difference between two points can be expressed as :

a. Volt per meter

b. Watt per ampere

c. Coulomb per Newton

d. Volt per ampere

3. Laplace tarnsform of is :

a.

b.

c.

d.

4. In a linear network the ratio of voltage excitation to current response is unaltered whenposition of excitation and response are interchanged. This assertion stems from :

a. principle of duality

b. principle of superposition

c. reciprocity theorem

d. equivalent theorem

5. The bandwidth of an amplifier can be increased by :

a. decreasing the capacitance of its bypass filter

b. increasing input signal frequency

c. cascading it

d. minimising its stray capacitance

6. Without the DC source, a clipper acts like a :

a. rectifier

b. clamper
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Solutions: Click Here c. demodulator

d. chopper

7. In order to build a mod-6 counter using three flip-flops the number of possible count

sequence is : a. 4

b. 8

c. 16

d. 28

8. The content of a 4-bit register is 1101. The register is shifted 6 times to the right with serialinput being 101101. The final content of the register will be :

a. 1011

b. 0010

c. 1010

d. 0111

9. A microprocessor with a 16-bit address bus is used in linear memory selection configurationwith 4 memory chips, the maximum addressable memory space is :

a. 64 k

b. 16 k

c. 8 k

d. 4 k

10. The interface chip used for data transmission between 8086 and 16 bit ADC is :

a. 8259

b. 8255

c. 8253

d. 8251

11. The FORTRAN statement A52.5, J55*A22**4/2 will calculate J as :

a. 12

b. 8.5

c. 4.5

d. 4

12. A pointer is a variable that contains as its value :

a. the dimension of another variable

b. the address of another variable


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Solutions: Click Here c. the size of another variable

d. the value of another variable

13. An electromagnetic wave travels in free space with electric field

component . Its angular frequency w is :

a. 3e8 m/s

b. 3e8 rad/s

c. 1.5e8 rad/s

d. 1e8 rad/s

14. The behaviour of which of the following devices is governed by bulk effect :

a. Gunn diodeb. PIN diode

c. Tunnel diode

d. IMPATT diode

15. A frequency modulated signal is expressed as :

a. A cos [ wct1 K m(t) ]

b. A cos [ wct 1 ]

c. A cos [ wct ]d. A cos [ wct1K m() d ]

16. In PCM system if the quantisation levels are increased from 2 to 8, the relative bandwidthrequirement will :

a. become four times

b. remain same

c. be tripled

d. be doubled

17. Optical communication systems generally use :

a. amplitude modulation

b. frequency modulation

c. phase modulation

d. intensity modulation

18. A device that exhibits a negative resistance region is :

a. P-N diodeb. UJT
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Solutions: Click Here c. JFET

d. BJT

19. A pyrometer is used to measure :

a. temperature

b. pressure

c. light intensity

d. low current

20. A linear discrete-time system has the characteristic equation . The system :

a. is stable

b. is marginally stable

c. is unstable

d. assessed

21. Assertion (A): At high temperature, the avalanche breakdown voltage is higher. Reason (R):At higher temperature mean free paths of electrons and holes are shorter, therefore a largerfield is required to cause ionisation.





22. Assertion (A): The Wien Bridge can be used for frequency measurements. Reason (R): TheWien Bridge uses only capacitors and resistors.





23. Assertion (A): A demultiplexer cannot be used as a decoder. Reason (R):A demultiplexer isbuilt using AND gates only.





24. Assertion (A): In Intel 8085, the lower byte of address and data are multiplexed. Reason(R): This helps limit the number of external pin terminals.
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Solutions: Click Here a. Both (A) and (R) true and (R) is the correct explanation of (A)




25. Assertion (A): The solution of Poisson equation is the same as the solution of Laplaceequation. Reason (R): The Laplace equation is the same as Poisson equation for source freeregion.





26. Assertion (A): The total emf induced in a circuit equals the time rate of change of thetotal magnetic flux linking the circuit. Reason (R): The induced current in a loop is always sodirected as to produce a flux opposing the change in the flux density.





27. Assertion (A): AM has better noise performance than FM. Reason (R): AM results in increasein signal power.





28. Assertion (A): Optical communication has shifted from 1.3 mm to 1.55 mm in s ilica fibers.Reason (R): Dispersion and attenuation are both minimum at 1.55 mm.





29. Assertion (A): Thyristors are preferred to power diodes in variable power rectifiers. Reason(R): Thyristors provide controlled rectification and also power loss in them is less compared tothat in power diodes.


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Solutions: Click Here c. (A) is true but (R) is false


30. Assertion (A): An important property of laser radiation is its coherence. Reason (R):

Stimulated emission is the key to the operation of LASER. a. Both (A) and (R) true and (R) is the correct explanation of (A)




31. Consider the following semiconductor diodes : 1. Germanium diode 2. Silicon diode 3.Tunnel diode 4. Schottky diode The correct increasing order of forward voltage drop of theabove diodes is :

a. 1, 3, 4, 2

b. 1, 2, 3, 4

c. 3, 4, 2, 1

d. 3, 1, 4, 2

32. In the microwave region some of the band designations are Ku, X, K and Ka. The orderaccording to their allocated frequency band is :

a. Ku, X, K, Ka

b. X, Ku, K, Kac. Ka, Ku, K, X

d. K, X, Ku, Ka

33. Consider the Analog to Digital converters given below : 1. Successive approximation ADC 2.Dual Ramp ADC 3. Counter method ADC 4. Simultaneous ADC The correct sequence of theascending order in terms of conversion times of the above ADCs is

a. 3, 2, 4, 1

b. 2, 3, 4, 1

c. 2, 3, 1, 4

d. 3, 2, 1, 4

34. The various subsystems in an FM receiver are arranged as : 1. Mixer, RF amplifier, limiter,IF amplifier, discriminator, audio amplifier 2. RF amplifier, mixer, IF amplifier, limiter,discriminator, audio amplifier 3. RF amplifier, mixer, limiter, discriminator, IF amplifier, audioamplifier 4. Mixer, IF amplifier, limiter, audio amplifier, discriminator, RF amplifier Thecorrect sequence of subsystems is :

a. 1

b. 2c. 3
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Solutions: Click Here b. (iv)(iii)(ii)(i)

c. (ii)(iii)(iv)(i)

d. (iii)(iv)(i)(ii)

39. Match the List-I with List-II :List-I List-II

(a) Multiplexer (i) Sequential memory(b) Demultiplexer (ii) Converts decimal to binary(c) Shift Register (iii) Data selector(d) Encoder (iv) Routes out many output with single

input

a. (i)(ii)(iii)(iv)

b. (iv)(iii)(ii)(i)

c. (iii)(iv)(i)(ii)

d. (ii)(i)(iv)(iii)


(a) Sign flag (i) 7th bit(b) Zero flag (ii) 8th bit(c) Parity flag (iii) 1 bit(d) Carry fla (iv) 3rd bit

a. (ii)(i)(iv)(iii)

b. (i)(ii)(iii)(iv)

c. (iv)(ii)(i)(iii)

d. (iii)(iv)(i)(ii)


(a) Pointer (i) C Program(b) Dimension (ii) Array(c) Header (iii) Real variable(d) FLOAT (iv) Memory address

a. (i)(ii)(iii)(iv)

b. (iv)(ii)(i)(iii)

c. (iii)(iv)(i)(ii)

d. (ii)(i)(iv)(iii)



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(a) (i) Gauss' law for electricfield

(b) (ii) Ampere's law

(c) (iii) Faraday's law

(d) (iv) Gauss' law for magnetic field

a. (i)(ii)(iii)(iv)

b. (iv)(i)(iii)(ii)

c. (iii)(iv)(ii)(i)

d. (ii)(iii)(i)(iv)


(a) AM Broadcast (i) Multipath phenomenon(b) FM Broadcast (ii) 535 - 1600 KHz(c) TV Broadcast (iii) VSB modulation(d) Point to Point (iv) 88 - 108 MHz

a. (i)(ii)(iii)(iv)

b. (iii)(iv)(ii)(i)

c. (ii)(iv)(iii)(i)

d. (i)(iii)(iv)(ii)


(a) LDVT (i) Pressure(b) Bourdon gauge (ii) Temperature(c) Strain gauge (iii) Displacement(d) Thermister (iv) Stress

a. (i)(ii)(iii)(iv)

b. (iii)(i)(iv)(ii)

c. (iv)(i)(iii)(ii)

d. (ii)(i)(iv)(iii)


(a) Polarisation (i) Bandwidth(b) Coherence (ii) LCD
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Solutions: Click Here (c) Total internal reflection (iii) Laser(d) Dispersion (iv) Optical fiber

a. (ii)(iii)(iv)(i)

b. (i)(ii)(iii)(iv)c. (iv)(iii)(ii)(i)

d. (ii)(i)(iii)(iv)

Linked Items

[Read the passage below and answer the questions that follow based on your understanding of thepassage] In 1990 Planck proposed, in order to explain the distribution of energy in the spectrum ofblack body, that an oscillating electron may not radiate or absorb energy continuously, as required

by classic electrodynamics, but only in integer multiples of a fundamental unit called quantum. If fis the frequency of radiation, the energy of a quantum is given by E = hv where h is a constantknown as Planck's constant. In 1905, Einstine went further and suggested that light, orelectromagnetic radiation in general, might sometimes be regarded having a corpuscular or particlelike nature. The light particles, or quanta, are called photons. Photons are peculiar in that theytravel with the speed of light and have zero rest mass. What is important to notice is that can bethought of either as waves with particle like properties or as particles with wave like properties. In1924 de Broglie generalised the idea and suggested that any moving particles with mass m andspeed v, will in some experiments display wave like properties with wavelength = h/mv.

46. A quantum of visible light is called :

a. Photon

b. Proton

c. Hyperon

d. Phonon

47. A quantum will have more energy if :

a. the wavelength is longer

b. the frequency is higher

c. the amplitude is higher

d. the velocity is greater

48. The photon has its velocity in vacuum equal to :

a. 3e9 cm/s

b. 3e10 cm/s

c. 3e10 km/s

d. 9e10 cm/s


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Solutions: Click Here 49. For an electron moving with a speed of 5.9e8 cm/sec, the accompanying wave will have awavelength of :

a. 1.2e-8 cm

b. 1.2e-10 cm

c. 1.2e-6 cm

d. 1.2e-12 cm

50. The electron microscope works on the basis of :

a. refraction of light in lenses

b. wave like properties of electron in motion

c. pressure exerted by electron beam

d. Production of electromagnetic wave by impact of electrons on matter.


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Solutions: Click Here 1. Light falls on one end of a long open-circuited n-type semiconductor bar for low levelinjection the hole current is predominantly to :

a. Drift

b. Diffusion

c. Both drift and diffusion

d. Length of bar

2. Under high electric fields, in a semiconductor with increasing electric field :

a. The mobility of charge carriers decreases and saturates

b. The mobility of charge carriers increases.

c. The Velocity of charge carrier increases.

None of the above

3. The action of JFET in its equivalent circuit can be represented by :

a. Current controlled current source

b. Current controlled voltage source

c. Voltage controlled current source

d. Voltage controlled voltage source

4. The function is said to have :a. even symmetry

b. odd symmetry

c. halfwave symmetry

d. quarterwave symmetry

5. The Laplace transform of is equal to :

a.

b.

c.

d.

6. A heat sink is generally used with a transistor to :
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Solutions: Click Here a. increase the forward current

b. decrease the forward current

c. compensate for excessive doping

d. prevent excessive temperature rise

7. The 555 timer can be employed in : (1) A monostable multivibrator (2) A bistablemultivibrator (3) An astable multivibrator Of these statements

a. 1 & 2 are correct

b. 1 & 3 are correct

c. 2 & 3 are correct

d. 1, 2 & 3 are correct

8.A toggle operation is used : a. with a gate circuit

b. with a flip-flop

c. without a flip-flop

d. with a counter

9. A multiplexer : (1) selects one of the several inputs and transmits to a single output (2)routes the data from a single input to one of many inputs (3) converts parallel data into serialdata (4) is a combination circuit. Of these statements

a. 1, 2 & 4 are correct

b. 2, 3 & 4 are correct

c. 1, 3 & 4 are correct

d. 1, 2 & 3 are correct

10. Intel 8085 supports :

a. only isolated input output

b. only memory mapped input output

c. isolated input output and memory mapped input output

d. none of these

11. An I/O processor control the flow of information between :

a. Cache memory and I/O devices

b. main memory and I/O devices

c. two I/O devices

d. cache and main memories

12. In 8085, TRAP is :


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Solutions: Click Here a. always maskable

b. cannot interrupt a service subroutine

c. used for catastrophic events like temporary power failure

d. lowest priority interrupt

13. Which of the following is not a high level computer programming language ?

a. FORTRAN

b. MODED

c. COBOL

d. C++ language

14. Which microwave tube uses buncher and catcher cavities :

a. Magnetron

b. Klystron

c. Reflex Klystron

d. Tunneling wave tube

15. When a plane wave propagating through free space, the direction of the field : (A) E isperpendicular to the direction of propagation (B) H is perpendicular to the direction ofpropagation (C) E is perpendicular to the direction of the field H . Which is correct ?

a. 1 and 2

b. 2 and 3

c. 1 and 3

d. 1, 2 and 3

16. Given a carrier frequency of 100 KHz and a modulating frequency of 5 KHz the band widthof AM transmission is :

a. 5 KHz

b. 200 KHz

c. 10 KHz

d. 20 KHz

17. A PAM signal can be detected by using :

a. an ADC

b. an integrator

c. a bandpass filter

d. a highpass filter

18. Which of the following semiconductor device acts like a diode and two resistor ?


29/36

Solutions: Click Here a. Triac

b. Diac

c. SCR

d. UJT

19. In a thyristor, anode current is made up of :

a. Electrons only

b. Holes only

c. both electrons and holes

d. none of these

20. Which of the following semiconductor device acts like a diode and two resistor ?

a. speed

b. high voltage

c. transmission losses

d. micro wave power

21. A piezoelectric transducer converts :

a. Pressure to voltage

b. Pressure to velocity

c. displacement

d. vibration to kinetic energy

22. A LVDT has :

a. one primary coil and two secondary coils

b. two primary coils and one secondary coil

c. one primary coil and one secondary coil

d. two primary coils and two secondary coils

23. A strain gauge is a transducer which will convert :

a. Pressure into temperature

b. Pressure into velocity

c. Pressure into change of resistance

d. force into displacement

24. CMRR (Common Mode Rejection Ratio) for a differential amplifier should be :

a. Zero

b. Unity


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Solutions: Click Here c. Small

d. Large

25. Which of the following diode is used for frequency tuning ?

a. Varactor diode

b. Zener diode

c. Tunnel diode

d. Gunn diode


(a) BJT (i) Pinch off effect

(b) FET (ii) Frequency tuning(c) Varactor diode (iii) Negative resistance(d) Tunnel diode (iv) Punch through effect

a. (i)(iii)(ii)(iv)

b. (i)(ii)(iii)(iv)

c. (iv)(i)(ii)(iii)

d. (i)(iv)(iii)(ii)

27. Match the List-I with List-II :

List-I List-II(a) Former (i) Produces deflecting torque(b) Coil (ii) Provides base for the coil(c) Core (iii) Makes the magnetic field radia(d) Springs (iv) Provides controlling torque

a. (i)(ii)(iii)(iv)

b. (i)(ii)(iv)(iii)

c. (ii)(i)(iii)(iv)

d. (ii)(i)(iv)(iii)


(a) Passive Network (i) Contains electrically separable passivecircuit

(b) Active Network (ii) Contains electrically inseparable passive circuit

(c) Lumped Network (iii) Contains circuit elements without

energy


31/36

Solutions: Click Here (d) Distributed Network (iv) Contains circuit elements with energy

sources

a. (iii)(iv)(i)(ii)

b. (i)(ii)(iii)(iv)c. (ii)(i)(iv)(iii)

d. (iv)(i)(ii)(iii)


(a) Flip-Flop can be used as latch (i) D Flip-Flop(b) Flip-Flop can be used as delayed (ii) Master-slave Flip-

Flop(c) Flip-Flop does not have race problem (iii) JK Flip-Flop

(d) Flip Flop can be used as shift registers (iv) RS Flip-Flop

a. (iv)(i)(ii)(iii)

b. (ii)(iv)(i)(iii)

c. (i)(iii)(ii)(iv)

d. (iii)(i)(iv)(ii)


(a) Parallel comparator (i) Null balancing type(b) Successive approximation (ii) Faster converter(c) Dual slope (iii) Voltage dependent conversion type(d) Counter type (iv) Integrating type

a. (ii)(i)(iii)(iv)

b. (ii)(i)(iv)(iii)

c. (i)(ii)(iv)(iii)

d. (i)(ii)(iii)(iv)


(a) Frequency modulation (i) Envelop detection(b) Double sideband (ii) Companding

suppressed signal carrier(c) PCM (iii) Balance modulator(d) Amplitude modulation (iv) Pre-emphasis and de emphasis

a. (i)(ii)(iii)(iv)

b. (i)(ii)(iv)(iii)c. (iv)(iii)(i)(ii)


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Solutions: Click Here d. (iv)(iii)(ii)(i)


(a) RC coupling (i) High voltage gain and impedance matching

(b) Inductive coupling (ii) Ability to amplify dc and low frequencysignals

(c) Transformer coupling (iii) Minimum possible non-linear distortion(d) Direct coupling (iv) Low collector supply voltage can be

used

a. (iv)(i)(iii)(ii)

b. (iii)(iv)(i)(ii)

c. (i)(ii)(iii)(iv)d. (iv)(iii)(ii)(i)


(a) LASER (i) Emits light of low intensity(b) Solar cell (ii) Converts light energy into electrical

energy(c) Photo diode (iii) Deliver powers to load(d) LED (iv) Emits light of high intensity

a. (iv)(iii)(i)(ii)

b. (iii)(iv)(ii)(i)

c. (iv)(iii)(ii)(i)

d. (iii)(iv)(i)(ii)


List-I List-II(a) Single mode optical fiber (i) data rate is highest(b) Multi mode optical fiber (ii) data rate is medium(c) Graded index optical fiber (iii) data rate is lowest(d) Simple glass rod optical fiber (iv) data transfer not possible

a. (i)(iii)(ii)(iv)

b. (iii)(i)(iv)(ii)

c. (ii)(iv)(iii)(i)

d. (iv)(iii)(ii)(i)



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Solutions: Click Here List-I List-II

(a) LVDT (i) Pressure(b) Bourdon gauge (ii) Temperature(c) Strain gauge (iii) Displacement(d) Thermistor (iv) Stress

a. (iv)(iii)(ii)(i)

b. (iii)(ii)(i)(iv)

c. (iv)(i)(iii)(ii)

d. (iii)(i)(iv)(ii)

36. Assertion (A) : If a semiconductor is placed in a transverse magnetic field B and an electricfield E is applied across its other two faces, then it would produce an electric current I in thedirection perpendicular to both B and EReason (R) : Hall coefficient is proportional to the mobility of charge carriers in the

semiconductor.a. Both (A) and (R) true and (R) is the correct explanation of (A)




37. Assertion (A) : The Wein bridge can be used for frequency measurement.Reason (R) : The Wein bridge uses only capacitors and resistors.





38. Assertion (A) :R-2R ladder type D/A converter has a higher speed of conversion than aweighted resistance D/A convertor.Reason (R) : R-2R ladder type D/A converter uses a smaller number of components than theweighted resistance D/A converter.


b. Both (A) and (R) true but (R) is not the correct explanation of (A)c. (A) is true but (R) is false


39. Assertion (A) : Bistable multivibrator can be used as flip flop.Reason (R) : It has two stable states.






34/36

Solutions: Click Here 40. Assertion (A) : Reflex klystron is made up of a single cavity.Reason (R) : Velocity modulation occurs in the cavity.





41. Assertion (A) : Optical fibers have broader bandwidth to conventional copper cables.Reason (R) : The information carrying capacity of optical fibers is limited by Rayleigh scatteringloss.





42. Assertion (A) :A monostable multivibrator can be used to alter the pulse width of arepetitive pulse train.Reason (R) : Monostable multivibrator has a single stable state.





43. Assertion (A) : Radio and television receivers are generally of the superheterodyne type.Reason (R) : Wireless communication is possible by receiving signals through super heterodynereceivers.





44. Assertion (A) :A half-adder is faster than full adder.Reason (R) : A half adder gives only one output while a full adder gives two outputs.





45. Assertion (A) : Stimulated emission is the key to the operation of LASER.Reason (R) : An important property of LASER radiation is its coherence, under which is meantthe correlation between the phases of oscillation at different positions in space and at variousmoments of time.



35/36

Solutions: Click Here b. Both (A) and (R) true but (R) is not the correct explanation of (A)



Linked Items

[Read the passage below and answer the questions that follow based on your understanding of thepassage] Michael Faraday was one of the greatest of all scientific researchers. In 1845 he observedexperimentally a relationship between electromagnetism and light. Twenty years later James ClerkMaxwell published "A Dynamical theory of the Electro-magnetic field". Starting with four basicrelationship known as Maxwell's equations, he proved mathematically that electromagnetic wavescould propagate through a nonconducting medium. He predicted a value of wave velocity. In early1880 s Heinrich Hertz succeeded in verifying Maxwell's theory of electromagnetic wave through abrilliant series of experiments. The first application of electromagnetic waves was in the field ofcommunications. The major contribution in this respect came from Sir Jagdish Chandra Bose ofCalcutta, India and Guglielmo Marconi of Italy around 1895. Sir Jagadish Chandra Bose more than acentury ago generated millimeter wave by using Galena detector. With the invention of telegraphyby Samuel Morse in 1844 and telephone by Bell and Gray in 1876, a more detailed study ofelectrical signals on transmission lines was needed. Thanks to the pioneering work of Barkhausinand Kurz on positive -grid oscillators (1919), and Hull on smooth-bore magnetron (1921), reliablemicrowave sources became a reality. A tube with 20 watts output at 3 GHz was constructed byBritish Scientists in 1936. A year later, the Varlan brothers at Stanford conceived the idea ofvelocity modulation of an electron beam. Microwave tube development in the forms of travellingwave tube and Reflex Klystron in 1930 s was given great impetus by the threatening war clouds overEurope precipitated by events surrounding world war II. The early 1960 s saw the emergence ofMicrowave integrated circuits and solid state microwave sources. The pioneering efforts of J.B.Gunn, W.T.Read, B.C. Deloach and many others led to the successful development of Gunn effectand Impatt type oscillators. Gunn diode is based on Gunn effect and an useful microwave source ofpower in the frequency range of 1 GHz to 30 GHz. Gunn diode exibits NDM due to transferredelectron effect. With the development of satellite communication, microwave relay stations andfurther growth in commercial and military radars, microwave technology turned out to be billion-dollar industry. The International MTT symposium and the Transactions of the MTT are the majorsources of information on development in the theory and practice of microwave engineering.

46. Four basic relationships known as Maxwall's equation do not contain the following law :

a. Gauss lawb. Ampere's law

c. Faraday's law

d. Non existance of magnetic monopoles

47. Microwave frequency extends from :

a. 0.1 GHz to 100 GHz

b. 1 GHz to 30 GHz

c. 1 GHz to 300 GHz


36/36

Solutions: Click Here d. 50 MHz to 1000 GHz

48. Millimeter wave was demonstrated by Sir J.C Bose using a solid state detector. Thisdetector was made of :

a. Silicon

b. Germanium

c. Galena

d. Carbon

49. The idea of velocity modulation of an electron beam was used to construct :

a. Gunn diode

b. Reflex klystron

c. Magnetron

d. Carcinotron

50. Gunn diode is based on :

a. Impact ionization and avalanche multiplication effect

b. Transferred electron effect

c. Velocity modulation effect

d. Current modulation effect

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