PAPER-II ELECTRONIC SCIENCE Signature and Name of Invigilator
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(Name)
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(Name) Roll (In words)
J 8 8 1 2

Time 1 1/4 hours] [Maximum Marks 100





Number of Pages in this Booklet 8 Number of Questions in this Booklet 50 Instructions for the Candidates
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ELECTRONIC SCIENCE
Paper II

Note This paper contains fifty objective
type questions, each question carrying two

marks. Attempt all the questions.

1. In a JFET the change in drain current is due to the applied

Electric field between S and D


Electric field between G and S


Magnetic field between S and D


Magnetic field between G and S



2. The increase in temperature, the electrical conductivity would

increase in metals as well as increase in semiconductors


increase in metals but decrease in semiconductors


decrease in metals but increase in semiconductors


decrease in metals as well as in semiconductors



3. A network contains only independent current sources and resistors. If values of all resistors are doubled, then values of node voltages

will become half


will remain unchanged


will become double


cannot be determined unless circuit configuration and values of the resistors are known



4. Thevenin's theorem replaces a complicated circuit facing a load by an

ideal voltage source and parallel resistor


ideal current source and parallel resistor


ideal current source and series resistor


ideal voltage source and series resistor



5. When Op-Amp is used as an integrator, the feedback element is

Resistor


Capacitor


Zener diode


Voltage divider



6. The output Vof the ideal Op-Amp
o
circuit shown in the figure is



-10 V V


5 V 10 V



7. How many Flip-Flops are required to build a binary counter circuit to count from 0 to 1023

1 6


10 24



8. Among the following, the slowest ADC (Analog-to-digital converter) is

Parallel-comparator (i.e.) flash type


Successive approximation type


Integrating type


Counting type



9. In a microcomputer, WAIT states are used to

make the processor wait during a DMA operation


make the processor wait during a power interrupt processing


make the processor wait during a power shut down


interface slow peripherals to the processor



10. In a microprocessor, the register which holds the address of the next instruction to be fetched is

Accumulator


Program Counter


Stack Pointer


Instructor Register



11. Consider the following structure and declaration
1.
struct date

2.
int day;


3.
int month;


4.
int year;


5.

Struct data *pd
Which of the following is the correct
method to refer to the year member




(*pd)·year



(*pd).year pd.year



12. Which of the following is not a linear data structure

Array Linked list


Stack Tree



13. .2V . represents
.

Maxwell's equation


Laplace's equation


Poisson's equation


Gauss's law



14. The energy per unit time, per unit area transported by the electromagnetic fields is expressed as
. 1 ..
S ×
µ
o
. ..

S E ×
. ..



S µ ×


o
. 1 ..
S ×
.
o

15. Time-Division Multiplexing

can be used with PAM only.


combines five groups into a supergroup.


stacks 24 channels in adjacent frequency slots.


interleaves pulses belonging to


different transmissions.

16. One of the following types of becomes of great importance at frequencies. It is the

Shot noise


Random noise


Impulse noise


Transit-time noise


noise
high


17. A relaxation oscillator is one which

oscillates continuously


has two stable states


relax indefinitely


produces non-sinusoidal output



18. The transducer which generates electrical power

Photoconductor


Photodiode


Solar cell


Phototransistor



19. The step-index monomode fiber has diameter

10 µm 50 µm


100 µm 200 µm



20. Which control system has hysteresis property

ON-OFF controller


Proportional controller


Integral controller


controller



Directions Q. Nos. 21 to 30 The following items consist of two statements, one labelled the "Assertion and the other labelled the "Reason You are to examine these two statements carefully and decide if the Assertion and the Reason are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer accordingly.


Codes

Both and are true and is the correct explanation of


Both and are true, but

is not correct explanation of


is true, but is false.


is false, but is true.



21. Assertion If a semiconductor is placed in a transverse magnetic field B and an electric field E is applied across its other two faces, then it would produce an electric current in the direction perpendicular to both B and E.
Reason Hall co-efficient is proportional to the mobility of charge carrier in semi-conductor.

22.
Assertion The voltage-current characteristic of tunnel diode exhibits dynamic negative resistance region.

Reason The negative resistance occurs, therefore, tunnel diode behaves as low power oscillating device.


23.
Assertion R-2R ladder type D/A converter has a higher speed of conversion than a weighted resistance D/A converter.

Reason R-2R ladder type D/A converter uses a smaller number of components than the weighted resistance D/A converter.


24.
Assertion A processor can reference a memory stack without specifying an address.

Reason The address is always available and automatically updated in the stack pointer.


25.
Assertion The part of root locus on the real axis is not dependent upon the poles and zeros which are not on the real axis.

Reason Poles and zeros which are not on the real axis always occur in conjugate pairs.


26.
Assertion The top down structured programming should be used for developing programmes.

Reason The top down structured programming methodology enables us to get readable and easily provable program.


27.
Assertion Stimulated emission is the key to the operation of LASER.


Reason An important property of laser radiation is its coherence, under which is meant the correlation between the phases of oscillation at different positions in space and at various moments of time.

28.
Assertion An half adder is faster than full-adder.

Reason An half adder gives only one output while a full adder gives two outputs.


29.
Assertion A programmable Read-Only-Memory can be used as a synchronous counter.

Reason Each memory location of a programmable Read-Only-Memory is programmed and can be read synchronously.


30.
Assertion In PCM a message signal is represented by a sequence of coded pulses, which is accomplished by representing the signal in discrete form in both time and amplitude.

Reason The signal encoded in the form of quantized samples which translates into a coded number.


31.
Consider the following circuit configurations

1.
Common emitter

2.
Common base

3.
Emitter follower

4.
Emitter follower using




Dartington pair The correct sequence in increasing order of the input resistances of these configurations is

3 3


4 4



32. Digital measuring instruments use the following types of A to D converters
1.
Dual slope Type

2.
Counter Type

3.
Flash Type The correct sequence for these converters in decreasing order of their speed (fastest to slowest) is



2 3


1 1



33. Consider the following logic families
1. MOS 2. DTL
3. RTL 4. ECL The sequence of the logic families in the order of their increasing noise margin is

2 1


2 1



34. Consider the following communication systems
1.
FM Broadcast

2.
AM Broadcast

3.
Microwave Communication

4.
Optical Fiber Communication The sequence of the communication systems in the order of their increasing carrier frequency is



3 4


4 2



35. The highest data rate can be transmitted using following cables
1.
Co-axial cable

2.
Twisted-wire cable

3.
Optical fiber cable The correct sequence in the increasing order is



2 2


3 1



36. Match List I with List II and select the correct answer using codes given below
List I List II

LASER Spontaneous emission


Solar Cell Consumes electrical power due to the incident light


Photo diode Delivers power to a load


LED Stimulated emission




Codes















37. List I List II

BJT Pinch off effect


FET Controlled Rectification


SCR (iii) Negative resistance characteristics


Tunnel Punch through diode effect


Codes















38. List I List II

Ampere's force on a charge law


Biot's law force due to a current carrying conductor


Coulomb's electric flux law density at a point


Gauss's magnetic flux law density at a point


Codes















39. List I List II

Parallel n-bits

comparator conversion time


Successive Fastest approximation converter


Dual slope (iii) Voltage dependent conversion type


Counter type Integrating type


Codes















40. List I List II

Frequency Envelope modulation detection


Double Companding sideband suppressed signal carrier


PCM (iii) Balance modulator


Amplitude Pre-emphasis


modulation and de­emphasis
Codes








(iii)


(iii)



41. List I List II

LVDT Pressure


Bourdon tube Temperature


Strain gauge Displacement


Thermistor Stress


Codes


(iii)












42. List I List II (Flags) (Bit Position)

Sign flag 4th bit


Parity 6th bit


Zero 2nd bit


Auxiliary carry 7th bit


Codes


(iii)


(iii)









43. List I List II

Gunn Junctionless diode device


Solar cell Single junction device


MOSFET Double junction device


SCR Triple junction device


Codes











(iii)



44. List I List II

Monostable Quasi stable multivibrator state


Astable One stable state multivibrator


Schmitt (iii) Two stable trigger state


Bistable No stable state multivibrator


Codes















45. List I List II


Semi- Destructive conductor read out memory



Ferrite core Combinational memory logic


Magnetic (iii) Non-volatile tape memory


Flash EEPROM memory



Codes







Read the paragraph and answer the question 46 to 50
Noise may be defined, in an electrical sense, as an unwanted form of energy tending to interfere with the proper and easy reception and reproduction of wanted signals. Many disturbances of the electrical nature produce noise in receiver, modifying the signal in an unwanted manner. Noise is divided into two groups. Noise whose sources are external to the receiver and other one is noise created within the receiver itself. Various forms of noise created outside the receiver i.e. external noise includes atmospheric and extra-terrestrial noise and industrial noise. Atmospheric noise becomes less severe at frequencies above 30 MHz. Extra-terrestrial noises are solar noise and cosmic noise. They radiate over a very broad frequency spectrum which includes the frequencies, we use for communication. These disturbances are at the eruption of corona flares and sunspots. The noise generated is due to the random motion of electrons, atoms and molecules. Kinetic theory states that the temperature of the system increases due to the motion of the particles.
46. In a communication system, noise is most likely to affect the signal

at a transmitter


in a channel


in the information source


at the destination



47. Indicate the false statement.

HF mixers are generally noiser than HF amplifiers.


Impulse noise voltage is independent of bandwidth.


Thermal noise is independent of the frequency at which it is measured.


Industrial noise is usually of the impulse type.



48. The value of a resistor creating thermal noise is doubled. The noise power generated is therefore

halved


quadrupled


doubled


unchanged



49. One of the following is not a useful quantity for comparing the noise performance of receivers

Input noise voltage


Equivalent noise resistance


Noise temperature


Noise figure



50. Indicate the noise whose source is in a category different from that of the other three.

Solar noise


Cosmic noise


Atmospheric noise


Galactic noise



Space For Rough Work


Paper-II 8
J-88-12