PAPER-II ELECTRONIC SCIENCE Signature and Name of Invigilator
1.
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(Name)
Roll No.


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(Signature) (In figures as per admission card)



(Name) Roll (In words)
J 8 8 1 1

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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where is the correct response.
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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 transistor amplifier, the reverse saturation current I
CO

Doubles for every 10 C rise in temperature


Doubles for every 1 C rise in temperature


Increases linearly with temperature


Doubles for every 5 C rise in temperature


2. The frequency of oscillations in Colpitts oscillator is determined by

L only


C only


L and C only


Transistor gain


3. If the voltage drop across a 2 kO resistor is 8 what is the current flowing in the resistor

8 mA 2 mA


4 mA 1 mA


4. IC 7432 is a 2-input

EX-OR Gate


OR Gate


NOR Gate


NAND Gate


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

Carry status flag


Auxilliary carry status flag


Sign status flag


Zero status flag


6. Which is a correct statement

if (age 16)


if 16)


if 16)


if (age 16)


7. Indicate which of the following diode does not use negative resistance in its operation

Backward Gunn


IMPATT Tunnel


8. If the modulation index of an AM wave is changed from 0 to the transmitted power is

Unchanged


Halved


Doubled


Increased by 50 percent


9. Speed of a dc motor can be controlled by

Triac UJT


Chopper Inverter


10. The resistance of thermistor is a function of

Current Temperature


Heat Voltage


11. 0.8 nm separation in wavelength division multiplexing operating at 1550 nm wavelength, refers to

10 GHz 25 GHz


100 GHz 2.5 GHz


12. The transfer function of the system shown below is






1


1



13. A C)D is equal to

A BC D




BC




A C




A · (BC


14. The term critical frequency denotes

The lower frequency reflected by ionosphere


The highest frequency reflected by ionosphere


The lowest frequency by which communication is possible between any two given points


None of the above


15. Which one of the following addressing mode cannot be used in 8085

Direct addressing


Base Register addressing


Register Indirect addressing


Immediate addressing


16. OP-AMP has the following
1.
High input impedance

2.
Low output impedance

3.
Low slew rate

4.
Infinite CMRR
The correct answer is




2 and 4 2 and 3


3 and 4 1 and 3


17. IC 555 timer consists of the following
1.
Differential stage

2.
Flip Flop

3.
Discharge Transistor

4.
Discharge Capacitor The correct answer is



1 and 4 2 and 3


2 and 3 3 and 4


18. A signal flow is shown below, has


1.
There are three forward paths.

2.
There are three individual loops.

3.
There are two non-touching loops.

4.
There are three non-touching


loops.
The correct answer is


1 and 3 only


2 and 4 only


1 and 2 only


2 and 3 only


19. In a TV transmission
1.
Audio and Video are both frequency modulate.

2.
Audio is frequency modulated.

3.
Video is transmitted by SSB modulation.

4.
Video is transmitted using


USB modulation.
The correct answer is


1 and 3 2 and 4


1 and 2 3 and 4


20. Consider the following statements regarding configuration of TTL devices
1.
The output impedance of totem pole transistor is high.

2.
Open collector output devices have low switching speed.

3.
Power consumption of Schottky devices is high.

4.
Tristate output devices have


high switching speed The correct answer is

1 and 2 are correct


3 and 4 are correct


2 and 3 are correct


3 and 4 are correct


Questions 21 to 30 are Assertion and Reason type. Select your answers to these items using the codes given below and mark your answer sheet accordingly.


Codes

Both and are true and

is the correct explanation of


Both and are true but

is not a correct explanation of


is true but is false.


is false but is true.



and Questions
21.
Assertion The ion implantation is done by bombarding ions to the semiconductor surface.

Reason The doping is changed by ion implantation.


22.
Assertion Superposition theorem can be used to determine the output of a full wave rectifier whose inputs are sinusoidal signal sources of different frequencies connected in series.

Reason Superposition theorem holds good for all linear systems.


23.
Assertion Class C amplifier is a tuned amplifier which needs a resonant tank circuit as the load in the collector circuit of the transistor for its proper operation.


Reason In class C operation, the collector current flows for less than 180° of the ac cycle and hence collector current flows in the pulses.
24.
Assertion The race hazard problem does not occur in combinational circuits.

Reason The output of a combination circuit depends upon present inputs only.

25.
Assertion IC 8255 A is a programmable peripheral interface device.

Reason It can work as a timer.

26.
Assertion Helical antennas can be used as feeder for large parabolic reflectors to obtain circular polarisation.

Reason Parabolic reflectors reverse the sense of polarisation of the wave during reflection.

27.
Assertion Frequency modulation is preferable to amplitude modulation for transmitting high quality music.

Reason FM signal can be demodulated using frequency discriminator circuit.

28.
Assertion A triac is a three terminal semiconductor switching device which can control alternating current in a load.

Reason Triac can conduct current in either direction.

29.
Assertion Single mode fiber are preferred over multimode fiber in optical fiber communication systems.

Reason The attenuation of SMF is of the order of 5 dB/km.

30.
Assertion The statement is used less frequently than the statement.


Reason For most applications, it is more natural to test for continuation of a loop at the beginning rather than at the end of the loop.


Sequence type
31. The correct sequence in microwaves in terms of increasing frequency is
I. L Band II. S Band
III. C Band IV X Band Correct Answer is

IV, II, III II, III, IV


II, IV, III III, IV, II, I


32. The correct sequence of rise in time period is
I. Pico second
II. Femto second
III. Tera second
IV. Nano second Correct Answer is

II, III, IV IV, III, II, I


II, IV, III II, III, IV


33. The correct sequence of fabrication of IC's are
I. Masking
II. Metallization
III. Application of photo resist
IV. Ion implantation
II, III, IV III, IV, II
II, IV, III III, IV, II

34. Place the bandwidth required to transmit data in digital modulation technique in descending order.
I. 64 QAM II. 16 QAM
III. QPSIC IV. BPSIC

II, III, IV IV, III, II, I


II, III, IV IV, II, III


35. The decreasing order of propagation delay in logic families is
I. RTL II. CMOS
III. ECL IV. TTL

II, IV, III II, III, IV


III, IV, II III, II, IV


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

List I List II

DC voltage Reverse polarity


AC voltage Fixed polarity


Ohm's law (iii) P W/T (where w is work done)


Power V IR



Codes are















37. List I List II

Resistive Diaphragm Transducer


Capacitive LDVT Transducer


Inductive Humidity Transducer


Pressure Potentiometer Transducer


Codes are
















38. List I List II

Trap Interrupt Acknowledge


INTR Direct Memory Access


HOLD Interrupt Request


INTA Highest Priority Interrupt


Codes are















42. List I List II

39. List I List II
Boolean Minimization

2

Upper f f

cs Side Band


Bandwidth f f


c s
Power in Twice the
AM signal frequency
Codes are














...


40. List I List II

Rectifier 81.2


Fullwave 40.6 Rectifier


Halfwave 4 diodes Rectifier


Bridge AC to DC Rectifier


Codes are
















41. List I List II

Splicing Microwave oscillator


PCM Relaxation oscillator


Gunn diode Quantization


UJT Optical Fiber


Codes are














Lower



...

m

P

1

Side Band

C
2

Algebra


K-Map Synchronous


circuits


Clock Error correction


Parity De Morgan's theorem


Codes are
















43. List I List II
(System) (Order of Frequency)

Optical fiber 4 to 6 communication GHz


Mobile 88-108 communication MHz


FM 900-1800 Broadcasting MHz


Satellite


1014 Hz communication
Codes are
















44. List I List II

n-channel Reverse bias JFET is increases along better than the channel p-channel JFET


channel is High electric wedge field near the shaped drain and

directed towards the source



channel is Low leakage not current at gate completely terminal closed at pinch-off


Input Better frequency impedance


performance
is high since µn>>µp
Codes are
















45. List I List II

Pointers FORTRAN


Object DO LOOPS oriented programming


High level language


Recursion C




Codes are














Read the passage below and answer the questions 46 to 50 that follows based on your understanding of the passage
An antenna is generally metallic object, often a wire or collection of wires used to convert high frequency current into electro-magnetic waves and vica-versa. Transmitting and receiving antenna behaves identically. One of the important comparison antenna is the isotropic antenna. Directive gain of the antenna is a ratio comparing power density generated by a practical antenna in some direction. An antenna has two bandwidths, both measured between half power points. Because the electro-magnetic waves radiated by the antenna have the electric and magnetic vectors at right angle to each other and the direction of propagation is said to be polarized. Simple antenna may thus be horizontally or vertically polarised. More complex antennas may be circularly or elliptically polarised. For grounded vertical dipoles operated at frequencies upto the MF, the optimum effective height is just over a half-wavelength.
The Yagi-Uda antenna employ a folded dipole and parasitic elements to obtain reasonable gain in the HF and VHF ranges. High gain and narrow bandwidths are especially required of microwave antennas. Large number of microwave antennas incorporate the paraboloid reflector in their construction. Other microwave antennas are horns and lenses. A horn is an ideal for terminating a waveguide and may be conical, rectangular or sectorial. Dielectric lenses act on microwave radiation as do ordinary lenses on light. Wide band antennas are required either when the transmissions themselves are wideband or when working of narrow channel over a wide frequency range. Horns, the folded dipole and rhombic all have good broad band properties small loop antennas are often used for direction finding.
46. An ungrounded antenna near the ground

acts as a single antenna of twice the height.


is likely to need an earth mat.


acts as an antenna array.


must be horizontally polarised.


47. One of the following is very useful as a multiband HF receiving antenna. This is the

Conical Horn


Folded Dipole


Log-Periodic


Square Loop


48. Which of the following antenna is best excited from waveguide Biconical Horn
Helical Discone
49. Indicate the antenna that is not wideband.

Discone


Folded Dipole


Helical


Marconi


50. An antenna that is circularly polarized is

Helical


Small circular loop


Parabolic reflector


Yagi-Uda



Space For Rough Work