CUSAT CAT 2019 Question Paper Electronics

CAT 2019 - Electronics

019
2
S T
E
1. T
The SiO2 layer in an IC acts as
N
O
(A)
(B)
a resistor
SI
an insulating layer
(C) IS
mechanical output
M
M
(D) None of the above
D
A

N
2. O
If the arrow of crystal diode symbol is positive w.r.t. bar, then diode is …………. biased.
M
M
O
(A) forward

SAT
CO (B) reverse

C T E
(C) either forward or reverse
(D) None of the above

CU 3.
AT N
For faithful amplification by a transistor circuit, the value of VBE should ………. for a
19
S IO
silicon transistor

2 0
U
(A) be zero

S T
(B) be 0.01 V
S
C IS E
(C) not fall below 0.7 V
(D)
T
be between 0 V and 0.1 V

N
O
M I
4. Addition of pentavalent impurity to a semiconductor creates many
S
IS
D
(A) free electrons
(B) holes
M
A D
(C) valence electrons
(D)
A
bound electrons

N
5. O
The impurity level in an extrinsic semiconductor is about …. of pure semiconductor.
M
(A) 10 atoms for 108 atoms
M
(B)
(C)
1 atom for 108 atoms
1 atom for 104 atoms C O
(D) T
1 atom for 100 atoms
A
S
CU

6. A hole and electron in close proximity would tend to

(A) repel each other 019
(B) attract each other 2
(C) Have no effect on each other
S T
E
(D) None of the above
T
N
O
7. I
The reverse current in a diode is of the order of
S
(A) kA IS
M
D
M
(B) mA
(C) μA A

(D) AN
O
M
8.

SA
T
O
M
C (A) 2.5 V
(B) 3 V
O
C T E
The forward voltage drop across a silicon diode is about

CU
T
(C) 10 V

N
(D) 0.7 V

9. A
S IO
A crystal diode is used as
2 0 19
(A)
(B)
(C)
(D)
U
C IS S
an amplifier
a rectifier
an oscillator
a voltage regulator T E ST
N
O
10.
M S I
A trivalent impurity has …………. valence electrons
IS
(A)
D 4
M
A D
(B) 5
(C) 6
A
(D) 3
N
O
11. M
When the graph between current through and voltage across a device is a straight line, the
device is referred to as M
(A) linear C O
(B) active
AT
(C) nonlinear
S
(D) passive
CU

12. When the crystal current diode current is large, the bias is

(A) forward 019
(B) inverse 2
(C) poor
S T
E
(D) reverse
T
N
O
13. I
A zener diode is used as
S
(A) an amplifierI
S
(B) a voltageM
A
(C) a rectifier
M
D regulator

(D) a N
multivibrator
O
M
14.

SA
T
OThe
C (A) heavily O
M base of a transistor is …………. doped

C T
(B) moderately E
CU
T
(C) lightly

N
(D) None of the above

15. A
S IO 2 0 1
A transistor is a …………… operated device
9
(A)
(B)
(C)
(D)
U
C IS S
current
voltage

T E
both voltage and current
None of the above
ST
N
O
16.
M S I
With a 200 kHz clock frequency, eight bits can be serially entered into a shift register in
IS
(A)
D 4 μs
M
A D
(B) 40 μs
(C) 400 μs
A
(D) 40 ms
N
O
17. M
In a transistor, the base current is about …………. of emitter current
M
(A)
(B)
25%
20% C O
(C)
(D)
35 %
5% AT
S
CU

18. The input impedance of a transistor is

(A) high 019
(B) low 2
(C) very high
S T
E
(D) almost zero
T
N
O
19. I
The value of α of a transistor is
S
(A) more than 1I
S
(B) less than M
(C) 1 A
D1
M
(D) NoneN of the above
O
M
20.

SA
T
O
M
O E
The gain of an amplifier without feedback is 100 db. If a negative feedback of 3 db is
C applied, the gain of the amplifier will become
(A) 5 db
C T
CU
T
(B) 300 db

A N
(C) 103 db
(D) 97 db
19
S IO 2 0
U S
21. If the feedback fraction of an amplifier is 0.01, then voltage gain with negative feedback
is approximately
ST
(A)
(B)
C IS
500
100
O
N
T E

M
(C) 1000
(D) 5000
S I
IS
22.
D M
The gain of an amplifier with feedback is known as …………. gain

(A)
(B)
(C)
A resonant

O
N
open loop
A
closed loop
D
(D) None of the above
M
M
23.
C O
In an LC circuit, when the capacitor is maximum, the inductor energy is

(A) minimum
A T
(B) maximum
Smaximum and minimum
C U
(C) half-way between
(D) None of the above

24. An LC oscillator cannot be used to produce ………………. frequencies

(A) high 019
(B) audio 2
(C) very low
S T
E
(D) very high
T
N
O
25. I
In a phase shift oscillator, the frequency determining elements are
S
(A) L and C IS
M
D
M
(B) R, L and C
(C) A
R and C

(D) N
None of the above
O
M
26.

SA
T
O
M
C X = 1100 Ω?
L

(A) 313.45 W
O
C T E
What is the true power of a 24V AC parallel RL circuit when R = 45 Ω and

CU
T
(B) 12.8 W

A N
(C) 44.96 W
(D) 22.3 W
19
S IO 2 0
U S
27. At 100% modulation, the power in each sideband is ………………… of that of carrier

ST
C IS E
(A) 50%
(B) 40%
T
(C) 60%
N
(D) 25%
O
M IS
S I
D
28. An ammeter is connected in ……………. with the circuit element whose current we wish
to measure M
(A)
(B)
(C)
Aseries
parallel
O
N
A
D
series or parallel
(D) None of the above
M
M
29. O
C resistance is called
A galvanometer in series with a high

(A) an ammeter
A T
(B) a voltmeter
S
(C) a wattmeter
C U
(D) None of the above

30. 019
If the negative potential on the control grid of CRT is increased, the intensity of spot
2
(A) is increased
S T
E
(B) is decreased
(C) remains the same T
(D) None of the above N
O
S I
31.
S
The material used Ito coat inside the face of CRT is
M
A
(A) carbon D
M
(C) O
N
(B) sulphur
silicon
M phosphorous
O
(D)
M
T
32.
SA
O

C T E
C The most accurate device for measuring voltage is

CU
T
(A) voltmeter

N
(B) multimeter

A 9
(C) CRO
1
S IO
(D) VTVM

2 0
33.

(A)
(B)
U
C IS S
the same as
less than T E
T
The doping level in a zener diode is …………… that of a crystal diode
S
(C) more than N
O
M I
(D) None of the above
S
IS
34.
D M
An ideal ammeter has ………… resistance

(A)
(B)
(C)
(D)
A low
infinite
zero
high O
N
A
D

M
M
C O
AT
S
CU

35. If modulation is 100%, then signal amplitude is ………….. carrier amplitude

(A) equal to 019
(B) greater than 2
(C) less than
S T
E
(D) None of the above
T
N
O
36. I
A high Q tuned circuit will permit an amplifier to have high
S
(A) fidelity IS
M
D
M
(B) frequency range
(C) A
sensitivity

(D) N
Selectivity
O
M
37.

SA
T
O
M
O
C (A) at zero potential
(B) negative
C T E
In the normal operation of an SCR, anode is …………… w.r.t. cathode

CU
T
(C) positive

N
(D) None of the above

38. A
S IO 2 0 19
When a crystal diode is used as a rectifier, the most important consideration is

(A)
(B)
(C)
(D)
U S
forward characteristic

C IS
doping level

T
reverse characteristic
PIC rating
E ST
N
O
39.
M S I
The V-I characteristics for a TRIAC in the first and third quadrants are essentially
IS
D
identical to those of ………………. in its first quadrant
M
A D
(A) transistor
(B) SCR
A
(C) UJT
N
(D)
O
None of the above

M
40. A DIAC has …………. terminals M

(A) two C O
(B) three
AT
(C) four
S
U
(D) None of the above
C

41. A UJT has

(A) two pn junctions 019
(B) one pn junction 2
(C) three pn junctions
S T
E
(D) None of the above
T
N
O
42. I
Power electronics essentially deals with control of a.c. power at
S
S
(A) frequenciesIabove 20 kHz
M above 1000 kHz
D
M
(B) frequencies
A less than 10 Hz
(C) frequencies

(D) 50NHz frequency
O
M
43.

SA
T
OWhen
C generally
(A) high
O
M the emitter terminal of a UJT is open, the resistance between the base terminal is

C T E
CU
T
(B) low

A N
(C) extremely low
(D) None of the above
19
S IO 2 0
U S
44. When a UJT is turned ON, the resistance between emitter terminal and lower base
terminal
ST
(A)
(B)
C IS remains the same
is decreased
O
N
T E

M
(C) is increased
(D)
S I
None of the above

IS
45.
D M
Digital circuit can be made by the repeated use of

(A)
(B)
(C)
A O
N
A
D
OR gates
NOT gates
NAND gates
(D) None of the above
M
M
46. O
C in CE arrangement with output shorted
The h parameter is called …………….
fe

(A) voltage gain
A T
(C) input impedanceS
(B) current gain

CU
(D) None of the above

47. 019
In Boolean algebra, the bar sign (–) indicates
2
(A) OR operation
S T
E
(B) AND operation
(C) NOT operation T
(D) None of the above N
O
S I
48. IS
In differential-mode,
M
D
M
A ispolarity
(A) opposite signals are applied to the inputs

(B) the
(C) O
N gain one
the outputs are of different amplitudes
M only one supply voltage is used
O
(D)
M

SA
T
49.
CO

C T
The common-mode gain is
E
CU
T
(A) very high

N
(B) very low

A 9
(C) always unity
1
S IO
(D) unpredictable

2 0
50.

(A)
(B)
U
C IS S T E
T
With zero volts on both inputs, an OP-amp ideally should have an output
S
equal to the positive supply voltage
equal to the negative supply voltage
(C) equal to zero N
O
M I
(D) equal to CMRR
S
IS
51.
D M
A certain OP-amp has bias currents of 50 μA. The input offset current is

(A)
(B)
(C)
(D)
A 700 nA
99.3 μA
49.7 μA
O
N
A
D
None of the above
M
M
52. O
The active components in an IC are
C
(A) resistors
(B) capacitors A T
S
(C) transistors and diodes
U
(D) None of the above
C

53. Operational amplifiers use 019
2
(A) linear ICs
S T
E
(B) digital ICs
(C) T
both linear and digital ICs
(D) None of the aboveN
O
S I
54.
S
The 555 timer can Ibe used in which of the following configurations?
M
D
M
A Monostable
(A) Astable,

(C) O
N
(B) Monostable, Bistable
Astable, Toggled
M Bistable, Tristable
O
(D)
M
T
55.
SA
O

C T E
C How do fixed resistors usually fail?

CU
T
(A) Slowly over time

N
(B) By increasing their value

A 9
(C) By becoming an open circuit
1
S IO
(D) By increasing their value and becoming an open circuit

2 0
56.

(A)
(B)
U
C IS S T E
current remains the same
power decreases
T
With Ohm's law, if voltage increases and resistance stays the same
S
(C) current increases N
O
M I
(D) resistance decreases
S
IS
57.
D M
Which of the following is not Ohm’s law?

(A)
(B)
(C)
(D)
A V = IR
I = V/R
R = IV
O
R = V/I
N
A
D

M
M doped
58. O
In a UJT, the p-type emitter is …………….
C
(A) Lightly
(B) Heavily A T
(C) Moderately S
U
(D) None of the above
C

59. 019
What happens to current and resistance if the voltage doubles?
2
(A) T
Current doubles and resistance doubles.
S
E
(B) Current doubles and resistance is halved.
(C) T
Current remains the same and resistance doubles.
(D) N
Current doubles and resistance remains the same.
O
SI
60. ISvalue of a 12 V peak wave?
What is the average
M
(A) 3.82A VD
M
(C) O
N
(B) 4.24 V
7.64 V
M 9.42 V
O
(D)
M
T
61.
SA
O

C T E
C A system has the transfer function (1-s)/(1+s). It is known as a/an

CU
T
(A) Low pass system

N
(B) High pass system

A 9
(C) All pass system
1
S IO
(D) None of the above

2 0
62.

(A)
(B)
U
C IS S
A phase lag compensation will

T E ST
improve the relative stability
increase the speed of response
(C) N
increase the band width
O
M I
(D) increase the overshoot
S
IS
63.
D M
Which of the following bridges measures the dc resistances?

(A)
(B)
(C)
(D)
A Whetstone
A
D
Maxwell bridge
N
Hay bridge
O
Schering bridge
M
M
C O
AT
S
CU

64. When a rectangular voltage waveform is applied to a capacitor, then the current
waveform is
019
(A) rectangular 2
(B) sinusoidal
S T
E
(C) saw tooth
(D) square T
N
O
SI
65.
IS
A loss less line of characteristic impedance Z is terminated in pure reactance of -jZ
0 0

value. VSWR isM

(A) 10 A
D
M
(B) 2 N
(C) O 1
M
M
O
(D) Infinity

SA
CO
C T E
T If the output of an amplifier is 10 V and 100 mV from the output is fed back to the input,
66.

T
then feedback fraction is
CU (A)
(B)
10
1
A N 19
S IO 0
(C) 01
(D) 15 2
67. U
C IS S E ST
When voltage feedback (negative) is applied to an amplifier, its input impedance
T
(A) is decreased
N
O
M
(B) is increased
(C)
S
remains the same I
IS
D
(D) None of the above

M
68.

A D
If a parallel plate capacitor connected to a battery, stores twice as much charge as with air
A
dielectric, the susceptibility of the dielectric material between the capacitor plates is

(A) 4 O
N
(B) 1 M
(C) 0
M
(D) 2
C O
AT
S
CU

69. Emitter follower is used for

(A) current gain 019
(B) impedance matching 2
(C) voltage gain
S T
E
(D) None of the above
T
N
O
70. I
The positive clipper is that which removes the …………………. half-cycles of the input
S
voltage.
IS
M
(A)
(B)
D
negative
A
positive
M
(C) N
both positive and negative
(D) O
None of the above
M

S
71.
AT
M

(A)
O E
COOne would find a clamping circuit in
C T
receiving antenna

CU
T
(B) radio transmitter

A N
(C) radio receiver
(D) television receiver
19
S IO 2 0
U S
72. A power supply which has voltage regulation of ……….. is unregulated power supply

ST
C IS E
(A) 0%
(B) 5%
T
(C) 10 %
N
(D) 8%
O
M IS
S I
D
73. When the transistor (CE arrangement) is in the cut off region, the collector current is
M
A D
(A) ICBO
(B) ICEO
A
(C)
N
(β + 1) ICEO
(D)
O
IC(sat)

M
M
C O
AT
S
CU

74. If the input to an integrating circuit is a succession of alternating positive and negative

19
pulses of very short duration, the output will be …………… wave
0
(A) rectangular 2
(B) triangular
S T
E
(C) sine
(D) square T
N
O
S I
75.
I
A small concentrationS minority carriers is injected into a homogeneous semiconductor
of
M An electric field of 10V/cm is applied across the crystal and this
M
crystal at one point.
D carriers a distance of 10cm in 20 µ sec. The mobility (in cm /volt sec)
moves the minority 2
A

N
of the minority carriers is
O
(A)M 1,000
M
O
(B) 2,000

SA
T
O
C (C) 5,000
(D) 500,000

C T E
CU 76.
T N
The knee voltage of a crystal diode is approximately equal to ………….

A 19
S IO
(A) applied voltage
(B)
(C)
breakdown voltage
forward voltage 2 0

77.
(D)

U
C IS S
barrier potential

T E ST
In a multivibrator, we have ………. feedback.
N
O
M I
(A) negative
(B) 100 % positive
S
IS
D
(C) both positive and negative
(D)
M
None of the above

78.
A A
D
In CE arrangement, the value of input impedance is approximately equal to

(A) Hie O
N
(B) Hoe M
(C) Hre
M
(D) None of the above
C O
AT
S
CU

79. The smallest change in applied stimulus that will indicate detectable change in deflection
in an indicating instrument is called
019
(A) sensitivity 2
(B) accuracy
S T
E
(C) resolution
(D) precision T
N
O
S I
80.
IS easy measurement of …………… values
An oscilloscope provides
M
D
(A) instantaneous
(B) rms A
M
(C) peakN to peak
O
(D) average
M

SA
O
M
O E
81. C A NPN transistor has a beta cut off frequency f of a 1 MHz and common-emitter short

C T o
β
T circuit low-frequency current gain β of 200.Its unity gain frequency f and the alpha cut
T

T
off frequency f respectively are
CU
α

(A)
(B)
A N
200 MHz,201MHz
200 MHz,199MHz
19
S IO 0
(C) 199 MHz,200MHz
(D) 201 MHz,200MHz 2
82. U
C IS S E ST
Laser light which is monochromatic light is also known as
T
(A) chromatic
N
O
M
(B) coherent light
(C) photon
S I
IS
D
(D) multichromatic

M
83.

(A)
(B)
A O
N
conductor
insulator
D
An ideal crystal diode is one which behaves as a perfect ………. when forward biased.
A
(C) resistance material
M
(D) None of the above
M
C O
AT
S
CU

84. A multimode step index fiber has a large core diameter of range

(A) 100 to 300 μm 019
(B) 100 to 300 nm 2
(C) 200 to 500 μm
S T
E
(D) 200 to 500 nm
T
N
O
85. I
The internal quantum efficiency of LEDs decreasing ……….with………. temperature.
S
IS decreasing
(A) exponentially,
M increasing
D
M
(B) exponentially,
A increasing
(C) linearly,

N decreasing
(D) linearly,
O
M
86.

SA
T
O
M
O E
Multimode step index fiber has
C (A) large core diameter and large numerical aperture
C T
(B) large core diameter and small numerical aperture

CU
T
(C) small core diameter and large numerical aperture

N
(D) small core diameter and small numerical aperture

87. A
S IO 2 0 19
Which statement about a series RC circuit is true?

(A)
(B)
(C)
(D)
U S T
The capacitor's voltage drop is in phase with the resistor's voltage drop.

C IS
S
The current leads the source voltage.

T E
The current lags the source voltage.
The resistor voltage lags the current.
N
O
88.
M S I
A current ratio of IC/IE is usually less than one and is called
IS
(A)
D Beta
M
A D
(B) Theta
(C) Alpha
A
(D) Omega
N
O
89. M
There are …………… h parameters of a transistor
M
(A)
(B)
two
four C O
(C)
(D)
three
A
None of the above
T
S
CU

90. A transistor behaves as a linear device for

(A) small signals only 019
(B) large signals only 2
(C) both small and large signals
S T
E
(D) None of the above
T
N
O
91. I
If temperature changes, h parameters of a transistor
S
S
(A) may or mayInot change
M
D
M
(B) do not change
(C) also A change

N of the above
(D) None
O
M
92.

SA
T
O
M
O E
With the positive probe on an NPN base, an ohmmeter reading between the other
C transistor terminals should be
(A) open
C T
CU
T
(B) infinite

A N
(C) low resistance
(D) high resistance
19
S IO 2 0
U S
93. Voltage-divider bias provides

ST
C IS E
(A) an unstable Q point
(B) a stable Q point
T
(C)
N
a Q point that easily varies with changes in the transistor's current gain
(D)
O
a Q point that is stable and easily varies with changes in the transistor’s current

Mgain

IS
S I
94.
D M
To operate properly, a transistor's base-emitter junction must be forward biased with

A D
reverse bias applied to which junction?
A
(A)
N
collector-emitter
(B)
O
base-collector
(C) base-emitter
M
(D) collector-base
M
C O
AT
S
CU

95. If a 3-input NOR gate has eight input possibilities, how many of those possibilities will
result in a HIGH output?
019
(A) 1 2
(B) 2
S T
E
(C) 7
(D) 8 T
N
O
SI
96.
IS a
A zero-level detector is
M with a sine-wave output
D
(A) comparator

M
A with a trip point referenced to zero
(B) comparator

N detector
(C) peak
(D) O
M limiter

SA T
O
M
O
C T
(A) scaling adder E
97. C A digital-to-analog converter is an application of the

CU
T
(B) voltage-to-current converter

A N
(C) noninverting amplifier
(D) adjustable bandwidth circuit
19
S IO 2 0
U S
98. What does a Hall effect sensor sense?

ST
C IS E
(A) Temperature
(B) Moisture
T
(C) Magnetic fields
N
(D) Pressure
O
M IS
S I
D
99. Why does the Superposition theorem not applicable to power?
M
A D
(A) Because it is proportional to square of current and current is a non-linear function
(B)
A
Because it is proportional to square of voltage and voltage is a non-linear function
(C)
N
Both A and B
(D)
O
None of the above

M
M
C O
AT
S
CU

100. Which operation is likely to get executed or performed by Millman’s theorem in terms of

19
converting the voltage or current sources into a single equivalent voltage or current
0
source?
2
(A) Subtraction S T
E
(B) Combination
(C) Differentiation T
N
(D) Integration O
S I
S
Ifollowing
M
M
101. Which among the is also regarded as ‘Dual of Thevenin’s Theorem’?
D
A Theorem
(A) Norton’s

N
(B) Superposition Theorem
O
(C) Millman’s Theorem
M
M
O
(D) Maximum Power Transfer Theorem

SA
CO
C T E
T Which of the following theorem is manifestation of the law of conservation of energy?
102.

CU (A)
(B)
(C) T
Tellegens theorem

A N
Reciprocity
Thevenin’s theorem
19
S IO 0
(D) Norton theorem
2
103.
U S ST
The d.c. resistance of a crystal diode is …………. its a.c. resistance

C IS
(A) the same as
T E
(B) more than
N
O
M
(C) less than
(D)
S I
None of the above

IS
104.
D M
The device that does not have the gate terminal is

A
(A)
(B)
(C)
TRIAC
FET
SCR
O
N
A
D
(D) DIAC
M
M
105. An impulse response of RL circuitO
C is a

Tfunction
(A) Rising Exponential function
A
(C) Step function S
(B) Decaying Exponential

CU
(D) Parabolic function

106. 019
If the temperature of a crystal diode increases, then leakage current
2
(A) remains the same
S T
E
(B) decreases
(C) increases T
(D) becomes zero N
O
SI
IS would be required to add the numbers 973 + 39 ?
107. How many BCD adders
M
M
10 10

(A) 3 A D

(B) 4 N
(C) O5
M6
O
(D)
M
T
108.
SA
O

C T E
C In an unregulated power supply, if load current increases, the output voltage

CU
T
(A) remains the same

N
(B) decreases

A 9
(C) increases
1
S IO
(D) None of the above

2 0
109.

(A)
(B)
U
C IS
0%
5%
S T E
T
An ideal regulated power supply is one which has voltage regulation of
S
(C) 10% N
O
M I
(D) 1%
S
IS
110.
D M
As the junction temperature increases, the voltage breakdown point for Zener mechanism

(A)
(B)
(C)
(D)
A increases
decreases
N
A
D
remains the same
O
None of the above
M
M
C O
111. The rupture of co-valent bonds will occur when the electric field is ………….

(A) 100 V/cm
(B) 6 V/cm AT
(C) 1000 V/cm
(D) More than 10 U 5
S
V/cm
C

112. A 256 x 4 EPROM has 019
2
(A) 8 address pins and 4 data pins
S T
E
(B) 8 address pins and 8 data pins
(C) T
4 address pins and 8 data pins
(D) N
4 address pins and 4 data pins
O
SI
S
113. In a Zener voltage Iregulator, the changes in load current produce changes in
M
(A) Zener D
Acurrent
M
(C) O
N
(B) Zener voltage
Zener voltage as well as Zener current
M None of the above
O
(D)
M
T
114.
SA
O

C T E
C The maximum efficiency of full wave rectification is

CU
T
(A) 40.6%

N
(B) 100%

A 9
(C) 81.2%
1
S IO
(D) 85.6%

2 0
115.

(A)
(B)
U
C IS S
active region
breakdown region T E
T
When transistors are used in digital circuits they usually operate in the
S
(C) N
saturation and cut off regions
O
M I
(D) linear region
S
IS
116.
D
A MOS transistor
M
(A)
(B)
(C)
(D)
A A
D
has only one pn junction
conducts only sufficient voltage if applied to the gate electrode
N
has only two electrodes
O
has gate electrode in direct contact with the silicon
M
M
117. In 8-bit microcomputer having 8 KObytes of RAM memory the length of the SP will be
C
(A) 5
(B) 8 A T
(C) 11 S
(D) 13
C U

118. 019
When we use RRC instruction once in 8085, the number is
2
(A) Multiplied by 2
S T
E
(B) Divided by 2
(C) Multiplied by 4 T
(D) Divided by 4 N
O
SI
IS to clear lower four bits of the accumulator in 8025 assembly level
119. The single instruction
language is DM
A
M
(A) XRIN OHF
(B) O ANI FOH
M
O
(C) XRI FOH
M
O
E
(D) ANI OFH
C
T
C T
SA120. Which of the following is not a vectored interrupt?
CU (A)
(B)

AT
TRAP
INTR
N 19
S IO
(C) RST 7.5
(D) RST 3
2 0
121.
U
C IS S E ST
In a microprocessor the register which holds the address of next instruction to be fetched
is
T
N
(A) Accumulator
O
(B)
(C)
M
PC
Stack pointer
IS
S I
(D)

D Instruction register
M
122.
A A
D
How many pins do 8085 microprocessors have?

(A) 24
O
N
(B)
(C)
30
40 M
(D) 48 M
C O
AT
S
CU

123. 019
Which of the following translator program converts assembly language program to object
program? 2
S T
E
(A) Assembler
(B) Compiler T
(C) Macro processor N
O
(D) Linker
SI
IS
M
124. D
M
The instruction of high level language is
A

(A) N instruction
Deferred
(B) OMicro instruction
M Macro instruction
O
(C)
M Mnemonics instructions
CO
E
(D)

SA T
125.
C T
Which of the following is the procedure for organizing logical steps in solving the

CU problems?

(A)

AT N
Flow chart
19
S IO 0
(B) Algorithm
(C) Logic
2
U S
(D) None of the above
ST
126.
C IS T E
The register whose content may be added to or subtract from the operant address prior to
N
or during execution of an instruction is known as
O
(A)
(B)
Mindex register

IS
S
control register
I
(C)
(D)
D address register
M
None of the above

127. A N
A
D
For the dominant mode in rectangular wave guide with breadth 10 cm the guide
O
wavelength for a signal of 2.5 GHz will be
M
(A) 12cm
M
(B)
(C)
15cm
18cm
C O
(D) 20cm
AT
S
CU

019
2
128. T
In circular wave guide with radius r the dominant mode is
S
E
(A) TM01 T
(B) TE01 N
O
(C) TM11
SI
IS
(D) TE11
M
D
M
A Multiplex
129. Time-Division

(A) O
N
can be used with PAM only
(B)M combines five groups into a super group

A T
O
M
O E
(C) stacks 24 channels in adjacent frequency slots
C (D) interleaves pulses in time domain belonging to different transmissions
C T
S 130. Quantization means conversion of
CU (A)

AT N
continuous time to discrete time
19
S IO
(B) continuous amplitude to discrete amplitude
(C) 0
continuous amplitude to discrete time
2
U
(D) discrete amplitude to continuous amplitude

131.

C IS
(A) PCM
S N
T E ST
Point out the mismatch among the following modulation techniques.

O
M I
(B) Delta
(C) Adaptive DeltaS
IS
D
(D) FM

M
132.
A
(A) O
55 KHz
N
A
D
A super heterodyne radio receiver with an intermediate frequency of 455 KHz is tuned to
a station operating at 1200 KHz .The associated image frequency is

(B) 1110 KHz M
(C) 2110 KHz M
(D) 4220 KHz
C O
AT
S
CU

133. Disturbance from adjacent power line is known as

(A) crosstalk 019
(B) crossfire 2
(C) inductive disturbance
S T
E
(D) None of the above
T
N
O
134. I
Capture effect is the characteristics of
S
(A) AM IS
M
D
M
(B) FM
(C) PCM A

(D) N
FDM
O
M

SA
M
O
CO (A) ground wave
T (B) space wave
C T E
135. Frequency in UHF range is propagated by means of

CU
T
(C) sky wave

N
(D) surface wave

136. A
S IO 2 0 19
The leakage current in a crystal diode is due to

(A)
(B)
(C)
(D)
U S
minority carriers

C IS
majority carriers
junction capacitance
None of the above T E ST
N
O
137.
M S I
The communication mode that supports data in both directions at same time
IS
(A)
D Simplex
M
A D
(B) Half duplex
(C)
A
Full duplex
(D)
N
Multiplex

O
138. M
The minimum value of anode current below which it must fall to completely turn-off the
device is called as the M
(A) holding current value C
O
(B) latching current valueT

SAvalue
(C) switching current value

CU
(D) peak anode current

139. What type of register would shift a complete binary number in one bit at a time and shift
all the stored bits out one bit at a time?
019
(A) PIPO 2
(B) SISO
S T
E
(C) SIPO
(D) PISO T
N
O
SI 151.75 to binary
140. Convert the decimalSnumber
M
I
D
(A) 10000111.11
A
(B) 11010011.01
M
N
(C) 00111100.00
O
(D) 10010111.11
M

SA
O
M
O E
141.C An 8-ohm resistor is in series with a lamp. The circuit current is 1 A. With 20 V applied,

C T
T what voltage is being allowed for the lamp?
CU (A) 4 V
(B) 8 V

A
(C) 12 VT N 19
S IO 0
(D) 20 V
2
142.
U S ST
The number of bits used to store a BCD digit is

C IS
(A) 8
T E
(B) 4
N
O
M
(C) 2
(D) 1
S I
IS
143.
D M
Which operator is having right to left associativity in the following?

A
(A)
(B)
(C)
O
N
A
D
Array subscripting
Function call
Addition and subtraction
(D) Type cast
M
M
O
C precedence?
144. Which operator is having the highest

(A) Postfix
A T
(B) Unary
S
(C) Shift
(D) Equality
C U

145. Decimal equivalent of the hexadecimal number E5 019
2
(A) 229
S T
E
(B) 279
(C) 427 T
(D) 3000 N
O
S I
S
146. What is the outputIof this program?
M
D
M
Ausing namespace
#include <iostream>

N int main() std;
O
M { int a;

SA
T
CO
M
O
C T E
a = 5 + 3 * 5;
cout << a;
return 0;

CU
T
}

(A) 35

A N 19
S IO
(B) 20
(C)
(D)
25
30 2 0
147. U
C IS S
Evaluate the following
T E
(false && true) || false || true
ST
N
O
M I
(A) 0
(B) 1 S
IS
D
(C) False
(D)
M
None of the above

148.
A N
A
D
If a signal passing through a gate is inhibited by sending a LOW into one of the inputs,

O
and the output is HIGH, the gate is a(n):

(A) AND M
(B) NAND M
(C)
(D)
NOR
OR C O
AT
S
CU

149. Increasing the number of turns of wire on the secondary of a transformer will

(A) increase the secondary current 019
(B) decrease the secondary current 2
(C) T
have no effect on the secondary current
S
E
(D) increase the primary current
T
N
O
150. I
Mutual induction is dependent on
S
IS
(A) winding ratios
M
D
M
(B) output polarities
A levels
(C) dc voltage

N changes
(D) current
O
M

SAT
CO
M
O
C T E
CU
AT N 19
S IO 2 0
U
C IS S T E ST
N
O
M IS
S I
D M
A O
N
A
D

M
M
C O
AT
S
CU

ELECTRONIC SCIENCE 9 PG - ANSWER KEY
1
20 CODE: 606
TEST
QN. NO. KEY QN. NO. KEY QN. NO. T KEY QN. NO. KEY QN. NO. KEY
E S

1 B 26 B 51 T A 76 D 101 A
2 A 27 D N
O52 C 77 B 102 A

I
3 C 28 A
ISS 53 B 78 A 103 C
4 A 29 B M 54 A 79 C 104 D
5 B 30 B AD 55
M C 80 C 105 B

6 B 31 N
OD 56 C 81 A 106 C
7 C 32 MC 57 C 82 B 107 A
8
9
10
D
B
D
33
34 T C
SA
35
O
M C
C
A
O
C TE
59
60
58
D
C
B
84
85
83
A
B
A 108
109
110
B
A
B
11
12
A
A
U
C 36
37
D
C
AT N
61
62
D
D
86
87
A
B
19
111
112
D
A
13 B 38 D
S I O63 A 88
2 0 C 113 A

U S
14 C 39 B 64 A 89 B 114 C
15 A 40 A 65 D S
90
T A 115 C
16
17
B
D
41
42 C IS
B
D
66
67
C
B
O
N
T E91
92
C
C
116
117
B
D
18 B 43 A
M 68
IS
D
S I 93 B 118 B

D
19 B 44 B 69 B 94 D 119 B
20 D 45 C 70 M B 95 A 120 D
21
22
23
B
C
A
46
47
48
A B
C
A
71
72
O
73
N
A
D D
C
B
96
97
98
B
A
C
121
122
123
C
C
A
M
24 C 49 B 74
MD 99 A 124 C

CO
25 C 50 B 75 C 100 C 125 B

AT
S
CU

019
2
QN. NO. KEY
S T
TE
126 A
127 B N
O
128 C SI
129 D IS
M
130 B A
D
M
131 D N
O
132 C M
133
134
135
A
B
B SA
T
CO
M
O
C TE
136
137
A
C
CU
AT N 19
138 A
S I O 2 0
U S
139 B
140 D ST
141
142
C
B C IS O
N
T E
143 D
M IS
S I
D
144 A
145 A M
146
147
148
B
B
B
A O
N
A
D

M
149 B
M
CO
150 D

AT
S
CU