1.
In a JFET the change in drain current is due to the applied
(A)
Electric field between S and D
(B)
Electric field between G and S
(C)
Magnetic field between S and D
(D)
Magnetic field between G and S
Answer: (B)
2.
The increase in temperature, the electrical conductivity would
(A)
increase in metals as well as increase in semiconductors
(B)
increase in metals but decrease in semiconductors
(C)
decrease in metals but increase in semiconductors
(D)
decrease in metals as well as in semiconductors
Answer: (C)
3.
A network contains only independent current sources and resistors. If values of
all resistors are doubled, then values of node voltages
(A)
will become half
(B)
will remain unchanged
(C)
will become double
(D)
cannot be determined unless circuit configuration and values of the resistors
are known
Answer: (D)
4.
Thevenin’s theorem replaces a complicated circuit facing a load by an
(A)
ideal voltage source and parallel resistor
(B)
ideal current source and parallel resistor
(C)
ideal current source and series resistor
(D)
ideal voltage source and series resistor
Answer: (D)
5.
When Op-Amp is used as an integrator, the feedback element iswww.netugc.in
(A)
Resistor
(B)
Capacitor
(C)
Zener diode
(D)
Voltage divider
Answer: (B)
Answer: (A)
7.
How many Flip-Flops are required to build a binary counter circuit to count from
0 to 1023?
(A)
1
(B)
6
(C)
10
(D)
24
Answer: (C)
8.
Among the following, the slowest ADC (Analog-to-digital converter) is
(A)
Parallel-comparator (i.e.) flash type
(B)
Successive approximation type
(C)
Integrating type
(D)
Counting type
Answer: (B)
9.
In a microcomputer, WAIT states are used to
(A)
make the processor wait during a DMA operation
(B)
make the processor wait during a power interrupt processing
(C)
make the processor wait during a power shut down
(D)
interface slow peripherals to the processor
Answer: (D)
10.
In a microprocessor, the register which holds the address of the next instruction
to be fetched is
(A)
Accumulator
(B)
Program Counter
(C)
Stack Pointer
(D)
Instructor Register
Answer: (B)
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?
(A)
(*pd)×year
(B)
(*pd)*year
(C)
(*pd)®year
(D)
pd®year
Answer: (A)
12.
Which of the following is not a linear data structure?
(A)
Array
(B)
Linked list
(C)
Stack
(D)
Tree
Answer: (D)
Answer: (C)
Answer: (A)
15.
Time-Division Multiplexing
(A)
can be used with PAM only.
(B)
combines five groups into a supergroup.
(C)
stacks 24 channels in adjacent frequency slots.
(D)
interleaves pulses belonging to different transmissions.
Answer: (D)
16.
One of the following types of noise becomes of great importance at high frequencies.
It is the
(A)
Shot noise
(B)
Random noise
(C)
Impulse noise
(D)
Transit-time noise
Answer: (D)
17.
A relaxation oscillator is one which
(A)
oscillates continuously
(B)
has two stable states
(C)
relax indefinitely
(D)
produces non-sinusoidal output
Answer: (D)
18.
The transducer which generates electrical power
(A)
Photoconductor
(B)
Photodiode
(C)
Solar cell
(D)
Phototransistor
Answer: (C)
19.
The step-index monomode fiber has diameter
(A)
< 10 μm
(B)
50 μm
(C)
100 μm
(D)
200 μm
Answer: (A)
20.
Which control system has hysteresis property?
(A)
ON-OFF controller
(B)
Proportional controller
(C)
Integral controller
(D)
P-I-D controller
Directions
: Q. Nos. 21 to 30 : The following items consist of two statements, one
labelled the “Assertion (A)” and the other labelled the “Reason (R)”. You are to
examine these two statements carefully and decide if the Assertion (A) and the
Reason (R) 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
:
(A)
Both (A) and (R) are true and (R) is the correct explanation of (A).
(B)
Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C)
(A) is true, but (R) is false.
(D)
(A) is false, but (R) is true.
Answer: (A)
21.
Assertion (A) : 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 I, in the direction perpendicular to both B and E.
Reason
(R) : Hall co-efficient is proportional to the mobility of charge carrier in
semi-conductor.
Answer: (B)
22.
Assertion (A) : The voltage-current characteristic of tunnel diode exhibits
dynamic negative resistance region.
Reason
(R) : The negative resistance occurs, therefore, tunnel diode behaves as low power
oscillating device.
Answer: (A)
23.
Assertion (A) : R-2R ladder type D/A converter has a higher speed of conversion
than a weighted resistance D/A converter.
Reason
(R) : R-2R ladder type D/A converter uses a smaller number of components than
the weighted resistance D/A converter.
Answer: (C)
24.
Assertion (A) : A processor can reference a memory stack without specifying an
address.
Reason
(R) : The address is always available and automatically updated in the stack
pointer.
Answer: (A)
25.
Assertion (A) : 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
(R) : Poles and zeros which are not on the real axis always occur in conjugate
pairs.
Answer: (A)
26.
Assertion (A) : The top down structured programming should be used for
developing programmes.
Reason
(R) : The top down structured programming methodology enables us to get
readable and easily provable program.
Answer: (A)
27.
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
meant the correlation between the phases of oscillation at different positions
in space and at various moments of time.
Answer: (A)
28.
Assertion (A) : An half adder is faster than full-adder.
Reason
(R) : An half adder gives only one output while a full adder gives two outputs.
Answer: (C)
29.
Assertion (A) : A programmable Read-Only-Memory can be used as a synchronous
counter.
Reason
(R) : Each memory location of a programmable Read-Only-Memory is programmed and
can be read synchronously.
Answer: (C)
30.
Assertion (A) : 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
(R) : The signal encoded in the form of quantized samples which translates into
a coded number.
Answer: (A)
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
(A)
2, 1, 4, 3 (
(B)
1, 2, 4, 3
(C)
2, 1, 3, 4
(D)
1, 2, 3, 4
Answer: (C)
32.
Digital measuring instruments use the following types of A to D converters :www.netugc.in
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
(A)
3, 1, 2
(B)
1, 2, 3
(C)
2, 3, 1
(D)
3, 2, 1
Answer: (D)
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
(A)
3, 4, 1, 2
(B)
3, 4, 2, 1
(C)
4, 3, 1, 2
(D)
4, 3, 2, 1
Answer: (D)
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
(A)
4, 2, 1, 3
(B)
2, 1, 3, 4
(C)
1, 2, 3, 4
(D)
3, 4, 1, 2
Answer: (B)
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
(A)
1, 3, 2
(B)
3, 1, 2
(C)
2, 1, 3
(D)
3, 2, 1
Answer: (C)
36.
Match List – I with List – II and select the correct answer using codes given below
:
List
– I List
– II
(a)
LASER (i)
Spontaneous emission
(b)
Solar Cell (ii)
Consumes electrical power due to the incident light
(c)
Photo diode (iii)
Delivers power to a load
(d)
LED (iv)
Stimulated emission
Codes
:
(a) (b) (c) (d)
(A)
(iv) (iii) (i) (ii)
(B)
(iii) (iv) (ii) (i)
(C)
(iv) (iii) (ii) (i)
(D)
(iii) (iv) (i) (ii)
Answer: (C)
37.
List – I List
– II
(a)
BJT (i)
Pinch off effect
(b)
FET (ii)
Controlled Rectification
(c)
SCR (iii)
Negative resistance characteristics
(d)
Tunnel diode (iv)
Punch through effect
Codes
:
(a) (b) (c) (d)
(A)
(i) (iii) (ii) (iv)
(B)
(i) (ii) (iii) (iv)
(C)
(iv) (i) (ii) (iii)
(D)
(i) (iv) (iii) (ii)
Answer: (C)
38.
List – I List
– II
(a)
Ampere’s law (i)
force on a charge
(b)
Biot’s law (ii)
force due to a current carrying conductor
(c)
Coulomb’s law (iii)
electric flux density at a point
(d)
Gauss’s law (iv)
magnetic flux density at a point
Codes
:
(a) (b) (c) (d)
(A)
(iii) (ii) (i) (iv)
(B)
(iv) (ii) (i) (iii)
(C)
(iv) (i) (ii) (iii)
(D)
(iii) (i) (ii) (iv)
Answer: (B)
39.
List – I List
– II
(a)
Parallel comparator (i)
n-bits conversion time
(b)
Successive approximation (ii)
Fastest converter
(c)
Dual slope (iii)
Voltage dependent conversion type
(d)
Counter type (iv)
Integrating type
Codes
:
(a)
(b) (c) (d)
(A)
(ii) (i) (iii) (iv)
(B)
(ii) (i) (iv) (iii)
(C)
(i) (ii) (iv) (iii)
(D)
(i) (ii) (iii) (iv)
Answer: (B)
40.
List – I List
– II
(a)
Frequency modulation (i)
Envelope detection
(b)
Double sideband suppressed signal carrier (ii)
Companding
(c)
PCM (iii)
Balance modulator
(d)
Amplitude modulation (iv)
Pre-emphasis and deemphasis
Codes
:
(a) (b) (c) (d)
(A)
(i) (ii) (iii) (iv)
(B)
(i) (ii) (iv) (iii)
(C)
(iv) (iii) (i) (ii)
(D)
(iv) (iii) (ii) (i)
Answer: (D)
41.
List – I List
– II
(a)
LVDT (i)
Pressure
(b)
Bourdon tube (ii)
Temperature
(c)
Strain gauge (iii)
Displacement
(d)
Thermistor (iv)
Stress
Codes
:
(a) (b) (c) (d)
(A)
(iv) (iii) (ii) (i)
(B)
(iii) (ii) (i) (iv)
(C)
(iv) (i) (iii) (ii)
(D)
(iii) (i) (iv) (ii)
Answer: (D)
42.
List – I List
– IIwww.netugc.in
(Flags)
(Bit Position)
(a)
Sign flag (i)
4th bit
(b)
Parity (ii)
6th bit
(c)
Zero (iii)
2nd bit
(d)
Auxiliary carry (iv)
7th bit
Codes
:
(a) (b) (c) (d)
(A)
(i) (iii) (ii) (iv)
(B)
(iv) (iii) (ii) (i)
(C)
(i) (iv) (iii) (ii)
(D)
(ii) (i) (iii) (iv)
Answer: (B)
43.
List – I List
– II
(a)
Gunn diode (i)
Junction less device
(b)
Solar cell (ii)
Single junction device
(c)
MOSFET (iii)
Double junction device
(d)
SCR (iv)
Triple junction device
Codes
:
(a) (b) (c) (d)
(A)
(iv) (i) (ii) (iii)
(B)
(iii) (iv) (i) (ii)
(C)
(i) (ii) (iii) (iv)
(D)
(ii) (iii) (i) (iv)
Answer: (C)
44.
List – I List
– II
(a)
Monostable multivibrator (i)
Quasi stable state
(b)
Astable multivibrator (ii)
One stable state
(c)
Schmitt trigger (iii)
Two stable state
(d)
Bistable multivibrator (iv)
No stable state
Codes
:
(a) (b) (c) (d)
(A)
(i) (ii) (iv) (iii)
(B)
(ii) (iv) (i) (iii)
(C)
(iii) (i) (ii) (iv)
(D)
(iv) (i) (ii) (iii)
Answer: (B)
45.
List – I List
– II
(a)
Semi– =conductor memory (i)
Destructive read out
(b)
Ferrite core memory (ii)
Combinational logic
(c)
Magnetic tape memory (iii)
Non-volatile
(d)
Flash memory (iv)
EEPROM
Codes
:
(a) (b) (c) (d)
(A)
(ii) (i) (iii) (iv)
(B)
(i) (ii) (iv) (iii)
(C)
(ii) (iii) (i) (iv)
(D)
(iv) (ii) (i) (iii)
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.
Answer: (A)
46.
In a communication system, noise is most likely to affect the signal
(A)
at a transmitter
(B)
in a channel
(C)
in the information source
(D)
at the destination
Answer: (B)
47.
Indicate the false statement.
(A)
HF mixers are generally noiser than HF amplifiers.
(B)
Impulse noise voltage is independent of bandwidth.
(C)
Thermal noise is independent of the frequency at which it is measured.
(D)
Industrial noise is usually of the impulse type.
Answer: (B)
48.
The value of a resistor creating thermal noise is doubled. The noise power generated
is therefore
(A)
halved
(B)
quadrupled
(C)
doubled
(D)
unchanged
Answer: (D)
49.
One of the following is not a useful quantity for comparing the noise performance
of receivers :
(A)
Input noise voltage
(B)
Equivalent noise resistance
(C)
Noise temperature
(D)
Noise figure
Answer: (A)
50.
Indicate the noise whose source is in a category different from that of the other
three.
(A)
Solar noise
(B)
Cosmic noise
(C)
Atmospheric noise
(D)
Galactic noise
Answer: (C)
