1. For the circuit shown in figure, the terminal voltage Vab is given by
<img src='./qimages/2110-9.jpg'><br><br>
Good conductor
Moderate conductor
Good dielectric
Bad dielectric

10


3. The carrier velocity in a silicon photodiode with 25 µm depletion layer width is 3 × 104 m/s. The maximum response time for the pin diode is given by

52 ns 2.5 ns


62 ns 5.2 ns



4. For a JFET, above the pinch-off voltage, as the drain voltage increases, the

the drain current remains constant.


the drain current decreases.


the drain current increases linearly.


the drain current varies parabolically.


5. What bandwidth is needed for an FM signal that has a peak deviation of ± 3 KHz and handles audio signals from 200 Hz to 5 KHz

6 KHz


16 KHz


10 KHz


9.6 KHz


6. In which of the following base system, 132 is not a valid number

Base 16 Base 10


Base 8 Base 2


7. What is the relation between k and T such that a unity feedback control system whose open loop transfer function below is stable
k
10)

0 k 10T


0 k 10T


0 k T


0 k T


8. Microprocessor development had happened because of LSI. What is LSI

Large Scale Integral


Large Signal Integration


Large Scale Integration


Long Signal Integration



9. 'Stdio.h' header file contains functions related to

prototypes for the standard input/output library functions.


prototypes for the standard input and standard output functions.


prototypes for the functions that perform input from files.


prototypes for functions that perform input from strings in memory and outputs to strings in memory.



10. The threshold voltage of a MOSFET can be lowered by
1.
using a thinner gate oxide

2.
reducing the carrier concentration in the substrate

3.
increasing the carrier


concentration in the substrate Of these statements

3 alone is correct.


1 and 2 are correct


1 and 3 are correct


2 alone is correct



11. An angular position to be measured using a transducer. Which of the following types of transducers can be used for this purpose
1.
Circular potentiometer

2.
LVDT

3.
E-pick off

4.
Synchro


Select the correct answer using the codes given below


Codes

3 and 4


2 and 3


2 and 4


1 and 4



12. In a hybrid TEE (Magic following statements are given
1. S, Sand Sarenon­
112233 44 zero.
2. All junctions are reciprocal i.e. S S
jk kj
3.
S and S are zero.

4.
S=0


11223344
13 2314 2443 and S 0
34Which one of the following is true

2 and 4 are correct.


1 and 2 are correct.


3 and 4 are correct.


2 and 3 are correct.



13. In optical fibers, following statements are given
1.
1550 nm is zero dispersion wavelength

2.
1330 nm is zero dispersion wavelength

3.
At 1330 nm, attenuation is minimum

4.
At 1550 nm, attenuation is minimum


Which one of the following is correct

1 and 4 are true.


1 and 3 are true.


2 and 4 are true.


2 and 3 are true.



14. Which of the following techniques are used to generate frequency modulated signal
1.
Armstrong

2.
Foster-Sealy Discriminator

3.
Balanced Modulator

4.
Reactance Modulator Which one of the following is true



1 and 2


2 and 3


1 and 3


1 and 4



15. Which of the following statements are true regarding the operation of JK flip-flop
1.
When K input is low and J input is high, the Q output of the flip flop is reset.

2.
When K input is high and J input is low, the output Q of the flip flop is set.

3.
When both the inputs K and J are low, the output Q does not change.

4.
When both the inputs K and J are high it is possible to set or reset the flip-flop the output toggle on next positive clock edge.


Which one of the following is true

1 and 2


3 and 4


2 and 3


All of the above



16. A linear two-terminal network can be replaced by an equivalent circuit consisting of a current source in parallel with resistor RN, where RN is
the ratio of
1.
Closed circuit voltage to short circuit current at the terminal pair.

2.
Open circuit voltage to open circuit current at the terminal pair.

3.
Open circuit voltage to short circuit current at the terminal pair.

4.
Closed circuit voltage to open circuit current at the terminal pair.



1 and 4


only 2


3 only


only 3 and 4



17. The following signals of microprocessors are intercepts
1.
TRAP



2.
INTA



3.
IO/ M



4.
RESET IN



1 and 3


1 and 4


2 and 3


3 and 4



18. C programming language can be considered as
1.
Low level programming

2.
High level programming

3.
Assembly level programming

4.
Machine level programming



1 and 4 2 and 3


1 and 2 3 and 4



19. A linear two terminal circuit can be replaced by an equivalent circuit consisting of a voltage source Vin
t series with a resistor Rwhere Ris
tt the ratio of
1.
open circuit voltage to the short circuit current at the terminal pair.

2.
short circuit current to the short circuit voltage at the terminal.

3.
Open circuit voltage to the open circuit current at the terminal pair.

4.
the independent sources are turned off.



1 and 4 2 and 4


3 and 4 2 and 3



20. Semi conductors have

Positive temperature coefficient of resistance


Zero temperature coefficient of resistance


Negative temperature coefficient of resistance


Resistance does not change with temperature



21. Consider the following Excimer Lasers used for photolithography and surgery purposes
1.
Ar Excimer laser

2.
ArF Excimer laser

3.
XeCl Excimer laser

4.
XeF Excimer laser


2
The correct sequence of the descending order of wavelength of operation is

4 4


4 1



22. Arrange the following communication systems in increasing order of their available commercial bandwidth
1.
Satellite Communication System

2.
Amplitude Modulated System

3.
Frequency Modulated System

4.
Two-line transmission system Correct sequence is



1 4


1 4



23. Priority of the interrupts in the order from the highest to least priority
1.
RST 7.5

2.
RST 5.5



3.
RESET IN

4.
RST 6.5
The correct sequence is




2 and 3


4 and 2


1 and 3


4 and 1



24. Sequence of operators according to the priority
1. 2.
3. 4. The correct sequence is

3 and 4


4 and 1


1 and 2


2 and 4



25. What is the correct sequence of the following step in the fabrication of a monolithic, bipolar junction transistor
1.
Emitter diffusion

2.
Base diffusion

3.
Buried layer formation

4.
Epi-layer formation


Select the correct sequence using the codes given below

2 2


1 1



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

List I List II
i. .
a.
. ×H v

.B

b.
.·


ii.
.t
c. . ×E .D
iii. J
.t
iv. 0
d. .· ×

Codes
ab cd

iv i ii iii


iii i ii iv


iii ii i iv


i ii iii iv


27. List I List II
a. Multiplexer i. Selects one of
many inputs to
a single output
b. Flip-Flop ii. Combinational
circuit
c. Shift iii. Memory
Register
d. Parallel iv. Sequential
Adder logic
Codes
a b c d

i iv ii iii

i iii ii iv
28. List I List II
a. Shot Noise i. Resistance
b. Johnson ii. Diode
Noise
c. Current iii. P-N junction
Noise
d. Partition iv. Triode
Noise
Codes
a b c d

iii iv i ii

ii i iii iv


29. List I List II
31. List I List II

a. 1550 nm i. 100 GHz a. Flash i. Integrating
b. 0.8 nm ii. Visible light converter type
c. d. 400-700 nm 200 nm iii. Ultra violet iv. 193 T Hz b. Successive approximation ii. Fastest converter
Codes a b c d c. Counter Ramp iii. Maximum conversion Time N

iv i ii ii i iii iii iv d. Dual Slope iv. Uses a DAC in its feed­back path

a b c d
30. List I (Structure/ Characteristics) a. n-channel JFET is better i. List II (Reasons) Reverse bias increases along ii i ii i iii iii iv iv iv iv iii iii i ii i ii
than p-channel the channel
JFET
b. Channel is ii. High electric 32. List I List II
wedge shaped field near the (Devices) (Characteristics)
drain and directed towards source a. BJT i. Voltage controlled negative
c. Channel is not iii. Low leakage resistance
completely closed at pinch-off d. Input impedance is high Codes current at the gate terminal iv. Better frequency performance since µn µp b. MOSFET c. Tunnel diode d. Zener diode Codes ii. High current gain iii. Voltage regulation iv. High input impedance
a b c d a b c d

J-88-14 7 Paper-II


33. List I List II
a.
Gauss meter i. Pressure measurement

b.
Logic ii. Flow analyser measurement

c.
Pirani gauge iii. Trouble shooting of digital electronic circuits

d.
Rotameter iv. Magnetic flux density


Codes
ab cd

i iv iii ii


ii iii i iv


i ii iii iv


iv iii i ii




34. List I List II
a.
AC i. Contains the data of stored from registers

b.
SP ii. used for storing address of the external memory

c.
HL iii. Contains the address of the instructions which has to be executed after completion of execution of present instruction.

d.
PC iv. Primary register to perform arithmetic and logical operations


Codes
ab cd

ii iii iv i


iii i ii iv


iv i ii iii


ii iv iii i




35. List I
a.
Super position theorem

b.
Thevenin's theorem

c.
Reciprocity theorem

d.
Maximum power transfer theorem




Codes
ab

iii i


ii iv


iv iii


ii i


List II
i. Ratio of excitation to response is constant when the positions of excitation and response are interchanged
ii. Applicable to linear systems
iii. Source represented by its Thevenin's equivalent circuits
iv. Reduce some portion of circuit to an equivalent source and a single element

cd
iv ii
i iii
i ii
iv iii Directions Q. Nos. 36 to 45 The following items consists 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 Reason are individually true and if so, whether the reason is a correct explanation of the Assertion. Select your answer 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.


36. Assertion Brewster angle is the angle of incidence at which there is no reflection.

Reason For parallel
polarisation, Brewster angle is
given by following expression

37.
Assertion An EDFA is usually pumped at 980 nm wavelength, which means that Erbium ions at ground level absorb energy.

Reason This absorbed energy is transferred to high frequency signals to boost up.


38.
Assertion D-flip-flops are used as buffer register.

Reason Flip-flops are free from "race-around" condition.


39.
Assertion Routh Hurwitz criterion gives both absolute as well as relative stability using characteristic equation.

Reason For a system to be stable all roots of characteristic equation must lie in left half of s-plane.


40.
Assertion Considering two and transistors of identical construction as far as shape, size and doping are concerned, the transistor will have a better frequency




...

...

.r
2
response.
sin2.
cos .
i
i
.r

E

1r
Reason The electron


E


...

...

.r

i
2
mobility is higher than that of
sin2.
cos .
i
i
.r
1
the hole mobility.


41.
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 coefficient is proportional to the mobility of the charge carriers in the semi conductor.

42.
Assertion A monostable multivibrator can be used to alter the pulse width of a repetitive pulse train.

Reason Monostable multivibrator has a single stable state.

43.
Assertion In a two port network, with 4 terminals four types of parameters like impedance, admittance, hybrid and transmission are considered and they are related to each other.


Reason The assumption made for the above statement is that there are no independent sources and non-zero initial conditions within the linear port network.

44. Assertion MOV 08 H
It means the contents memory address 08 H moved to be contents of A. of are

Reason MV 1 82 H
It means that the contents of memory address 82 H are moved to be contents of A immediately.

45. Assertion To avoid repetition of code and bulky programs functionally related statements are isolated into a function.
Reason Function definition defines the body of the function.

Read the passage and answer the questions 46 to 50 that follows based on your understanding of passage
An antenna is generally a metallic object, often a wire or collection of wires, used to convert high frequency current into electromagnetic waves and vice-versa. Antenna serve either or both of the following two functions, generation or the collection of electromagnetic energy. In a transmitting system, a radio-frequency signal is developed, amplified, modulated and applied to the antenna. The R-F currents flowing through the antenna produce electromagnetic waves which radiate into the atmosphere. In a receiving system, electromagnetic waves "cutting" through the antenna induce alternating currents for use by the receiver.
Efficient operation also requires that the receiving antenna be of the same polarization as the transmitting antenna. Polarization is the direction of the electric field and is therefore, the same as the antennas physical configuration. Thus vertical antenna will transmit vertical polarized light, any antenna having a physical length that is one-half wavelength of the applied frequency is called a Hertz antenna. Hertz antenna are predominantly used with frequencies above 2 MHz. Usually, at frequencies below 2 MHz, a Marconi type of antenna is used. The Marconi antenna is usually a quarter-wave grounded antenna or any odd multiple of a quarter wavelength.
The Yagi-Uda antenna consists of a drivers element and two or more parasitic elements. Yagi-Uda has two parasitic elements, a reflector and a director. This Yagi-Uda antenna provides about 7 dB of power gain with respect to a half-wavelength dipole reference. More complex antennas may be circularly polarized both vertically and horizontally polarized waves are radiated with equal power in both. If the powers are unequal the antenna is said to be elliptically polarized.
A horn is an ideal antenna for terminating a waveguide and may be conical, rectangular or sectorial. Wide band antennas either when the transmissions are wide band or when working of narrow channels over a wide frequency range is the major application. Helical antenna, which consists of a loosely wound helix backed up by a metal ground plane. Loop antennas are often used for direction finding. Loops have many shapes and generally consists of a single turn of wire. Discone is a ground plane antenna evolved from the vertical dipole and having a very similar radiation pattern.

46. A helical antenna is used for satellite tracking because of its

circular polarization


elliptical polarization


broad band width


good front-to-back ratio



47. The discone antenna is

a useful direction finding antenna


used as a radar receiving antenna


circularly polarized like other circular antennas


useful as a UHF receiving antenna



48. Which of the following antennas is best exerted from a waveguide

Biconical


Folded dipole


Horn


Discone



49. Which is a non-resonant antenna

Marconi


Rhombic


Yagi-Uda


Discone



50. An antenna is polarized in the plane of the field perpendicular to

Electric field


Magnetic field


Both Electric and Magnetic field


Field parallel to both electric and magnetic field