1. The register is a
1. Simplified
unit of a subtractor
2. Cascaded
group of the flip-flop
3. Binary
ripple counter
4. Data
selector
2. The energy of
the photo electron depends upon the following factor
1. Intensity
of incident radiation
2. Quality of
the photocathode
3. Frequency
of incident radiation
4. Type of
the incident light source
3. Hall effect is
used to determine
1. Magnetic
flux
2. Current
density
3. Type of
semiconductor material
4. All of the
above
4. Which one of the
following is the thermistor
1.
Semiconductor device
2. Microwave
device
3. Platinum
resistance thermometer
4.
Thermo-couple device
5. Silicon is
having direct band gap
1. True
2. False
3. No gap
4. None of
these
6. Boron is doped
in silicon to form
1. P-type
2. N-type
3. Intrinsic
4. None of
these
7. The
concentration of impurity in doped silicon semiconductor per atom is
1. 1018 b. 1022 c.108 d.10-22
8. Conduction in
P-type semiconductor is due to
1. Movement
of hole
2. Movement
of electron
3. Movement
of atoms
4. Movement
of electron-hole pair
9. Slope of
electrical conductivity Vs temperature in semiconductor is
1. Positive
2. Negative
3. Linear
4. No effect
10. Volt equivalent
of temperature of silicon at room temperature (300 deg K) is
1. 0.7V b. 1.1V c. 0.026V d. 16V
11. Carbon is not used as semiconductor
because
1. It does
not belong to silicon group
2. It is a
good conductor
3. It is not
a conductor
4. Band gap
is very high
12. In forward bias
of P-N junction depletion region
1. Increases
2. Decreases
3. Remains
the same
4. Breaks
down
13. Knee voltage in
diode stands for
1. Reverse
break down voltage
2. Saturation
voltage
3. Threshold
of current conduction
4. Peak
inverse voltage
14. An ideal
semiconductor diode for an AC input acts like
1.
Unidirectional switch
2.
Bidirectional switch
3. Cuts
off AC part
4. Power
booster
15. Reverse
saturation current in P-N junction diode is due to
1. Hole
conduction
2. Electron
conduction
3. Minority
carrier conduction
4. Majority
carrier conduction
16. In the zener
diode the break down in the reverse characteristic current is due to
1. Electrons
2. Hole
3. Electron
hole pair
4. Crystal
ions
17. The percentage
of voltage regulation is defined as
1. V no load
" V load r100 / V load
2. V load " V no load r100
/ V load
3. V
load " V no load
r100 / V no load
4. V no
load r100 / V load
18. Filtering is
effected by shunting the load with a
1. Capacitor
2. Resistor
3. Inductor
4. None of
these
19. Without applying
the biasing voltage the transistor current would be
1. Maximum
2. Minimum
3. No change
4. Zero
20. In the
transistor the doping at the emitter is much larger than the base results in
1. Emitter
current entirely of holes
2. Emitter
current entirely of electrons
3. Base
current is due to electron-hole pair
4. Emitter
does contribute carrier which can reach collector
21. The largest
current carrying component in P-N-P transistor is
1. Electrons
2. Holes
3. Electron
hole pair
4. Silicon
atoms
22. The circuit
shown in the figure represents
1. Rectifier
2. Clamping
circuit
3. Clipping
circuit
4. Low pass
filter
23. Clamping circuit
is used for
1. AC to DC
conversion
2. Biasing
3. Limiting
the amplitude
4. Wave
shaping
24. For ideal
clipping circuit one should use a diode with cut-in voltage
1. 0.7V b.1.1V c. 0V d. 0.2V
25. The ratio of
peak inverse voltage of full wave and half wave rectifier is
1. 1 b. 2 c. 1/2 d. 1/4
26. Which of the
following transistor configuration is a power amplifier
1. Common
emitter
2. Common
base
3. Common
collector
4. All of the
above
27. In a active mode
of a transistor, collector conduction takes place due to
1. Majority
carrier
2. Minority
carrier
3. Common
collector
4. All of the
above
28. Common emitter
configuration is used for a
1. Current
amplification
2. Voltage
amplification
3. Current
and voltage amplification
4. Charge
amplification
29. The transistor
configuration where input is emitter and output is collector is called:
1. Common
emitter
2. Common
base common collector
3. Voltage
follower(current gain)
30. Beta of a
transistor is given by
1. Ib/Ic b. Ic/Ib c. Ib/Ie d. Ic/Ie
31. Germanium
transistor is preferred over silicon transistor in the following application
1. High
frequency
2. High power
3. Low
voltage
4. Power
rectification
32. SCR is based on
the principle of
1. Voltage
regeneration
2. Current
regeneration
3. Power
regeneration
4. Power
rectification
33. The number of
clock pulses arriving at the digital counter input, should be in the form of
1. Decimal
2. Binary
3. Octal
4.
Hexadecimal
34. In which of the
counter the clock input is common to all flip flops
1. Asynchronous counter
2.
Synchronous counter
3. Decade
counter
4. Down
counter
35. Multiplexer
helps in which of the following
1. Repetition
of similar circuit construction
2. Selecting
all the signal at the output at the same time
3. Prevention
of constructing similar circuits
4. Increase
in the constructional costs due to repetition circuits
36. Full adder for
two inputs can be developed with the help of
1. Two half
adder on OR gate
2. One half
adder and two OR gate
3. An EXOR
gate and AND gate
4. Two AND
gates and an OR gate
37. The important
use of gray code is for a
1. Ripple
counter
2. Full adder
3. Encoder
4. Decoder
38. In which of the
code only one bit changes at each time
1. BCD
2. Aiken code
3. Excess 3
code
4. Gray code
39. In Johnson code
for N bits, the maximum number can be formed is given by an expression
1. 2.N b. 2N c. 2N " 2N d. None of these
40. The active mode
of transistor operation is used in log circuits because of its
1. Non
linearity
2. Linearity
3. Switching
nature
4. High speed
41. Intermediate
frequency in television receiver is
1. 26-46 MHz
2. 1.6-2.3
MHz
3. 455-KHz
4. None of
these
42. At absolute
temperature, a silicon crystal acts like an insulator because
1. Electrons
cannot move through a crystal
2. Electrons
are tightly held by other atoms
3. Electrons
can break away only by supplying energy
4. All of the
above
43. Extrinsic
semiconductor is
1. Doped with
impurities
2. Exists in
the pure state
3. N-type
only
4. Only
P-type
44. The process of
extracting the audio information from the modulated envelope is called
1. Modulation
2. Detection
3.
Transmission
4.
Oscillation
45. Selectivity of a
radio receiver is defined as
1. Ability to
reproduce the original frequencies
2. Ability to
eliminate wanted frequencies
3. Ability to
reject unwanted frequencies
4. Ability to
pick up the weak signal
46. Digital counter
cannot be used as
1. Clock
2. Timer
3. Event
counter
4. Multiplier
47. Distortion in
the amplifier is due to
1. Non
linearity of the device
2. Inductance
presents in the circuits
3.
Capacitance
4. Stray
effect
48. The purpose of
RF amplifier tuning in the radio receiver is
1. To reject
all the frequencies
2. To select
all the frequencies
3. Only to
select required frequencies & amplification
4. To vary
the band width
49. The intermediate
frequency used in the radio receiver is
1.
455KHz b. 1.6 MHz c. 20 MHz d. 60 MHz
50. The purpose of
using tuned circuit between stages in the radio receiver is
1. To
increase the selectivity
2. To
increase the sensitivity
3. To
increase both selectivity and sensitivity
4. To get the
detector output
51. In an amplifier,
the frequency characteristic may be divided into how many regions
1. Two b. Three c. Four d. Zero
52. Op.amp. has high
input impedance because
1. High band
width
2.
Differential amplifier
3. Current
source at input end
4. Common
collector configuration
53. Gain of an OP
amp. In inverting mode is "Rf / Rn provided, the OP.amp. has
1. Low output
impedance
2. Low input
bias current
3. High CMRR
4. High open
loop gain
54. Slew rate of an
OP.amp.is
1. Change of
O/p voltage with time
2.
Propagation speed
3. Input RC
time constant
4. Off set
voltage drift
55. Instrumentation
OP.amp. is used in application where
1. Two
instrument are to be interfaced
2. Input is
very low level signal
3. DC signals
are involved
4.
Differential signals are involved
56. An OP.amp.
integrater will be
1. Capacitor
at input
2. Diode at input
3. Diode feed
back
4. Capacitor
feed back
57. A logarithmic
amplifier will have
1. Inductor
feed back
2. Diode feed
back
3. Resistance
feed back
4. Thermistor
feed back
58. OP.amp. can be
converted into capacitor by
1. Increasing
bandwidth
2. Removing
feed back
3. Increasing
input impedance
4. Positive
feed back
59. Comparators are
used as
1. Switching
device
2. Linear
amplifiers
3. Power
amplifiers
4. High speed
amplifiers
60. Typical output
impedance of 741 OP amps. is
1. 0.5 W b. 1 K W c. 1 W d. 75 W
61. Typical unity
gain bandwidth of 741 OP amps. is
1. 10 MHz b. 100 KHz c. 1 MHz d. 1.5 MHz
62. OP.amp. wein
bridge oscillator works when the over all gain is
1. 180 b. 3 c. 1.2 d. 125
63. Important part
in a electronic voltage regulator is
1. Error
amplifier
2. External
pass transistor
3. Reference
voltage diode
4. All the
above
64. To generate a
triangular wave form from a square wave
1.
Differentiator is used
2. Integrator
is used
3.
Logarithmic amplifier is used
4. Clipping
circuit is used
65. For multiplying
two analog signals which one of the following is used
1. Comparator
2. Hall
effect device
3. Gunn diode
4. Tunnel
diode
66. Which of the
following device is used as an electronic memory element
1. Astable
multivibrator
2. Monostable
multivibrator
3. Magnetic
tape
4. None of
these
67. Phase sensitive
detector in lock-in-amplifier is used
1. To
increase the sensitivity of an instrument
2. To limit
the bandwidth
3. To
increase the dynamic range of the signal
4. To
increase the input impedance
68. In television
transmission video signal is
1. Frequency
modulated
2. Amplitude
modulated
3. Phase
modulated
4. delta
modulated
69. The Boolean
function XYZ + YZ + XZ, after simplification gives
1. X b. Y c. Z d. X+Y+Z
70. Extremely low
power dissipation and low cost per gate can be achieved in
1. MOS ICs
2. CMOS ICs
3. TTL ICs
4. ECL ICs
71. Which of the
following digital IC families can give maximum fan-out
1. ECL b. PMOS c. HTL d.
CMOS
72. A punched card
has
1. 22 rows,
90 columns
2. 12 rows,
80 columns
3. 12 rows, 2
columns
4. 8 rows,
128 columns
73. Which one of
the following is a 16 bit microprocessor
1. Zilog 80
2. Intel 8085
3. Motorola
6800
4. Intel 8086
74. (0.3125)10 when converted to base 8 gives
1.
(0.16)8 b. (0.26)8 c. (0.24)8 d. (0.124)8
75. Excess " 3
code is a
1. Weighted
code
2. Cyclic
code
3. Error
correcting code
4. Self
complementing code
76. ASC II code is a
1. Error
detecting code
2. Self
correcting code
3. An
alphanumeric code
4. A weighted code
77. Modulo " 2
addition is represented by
1. f = XY +
XY
2. f = XY +
XY
3. f = X + XY
4. f = XY +
XZ + YZ
78. Which one of the
following Boolean identities is correct?
1. XYZ + YZ +
XZ = YZ + XZ
2. XYZ + YZ
+XZ = XY + XZ
3. XY +XZ =
XY + XZ + YZ
4. X + XY =
XY
79. SN7410 IC is a
1. Quad 2
input NAND gate
2. Triple 3
input NAND gate
3. Dual M/S
J-K flip flop
4. None of
these
80. Intel 8085
microprocessor has two registers known as primary data pointers these are
1. Registers
V & C
2. Registers
D & E
3. Registers
H & L
4. None of
these
81. Intel 8080
microprocessor has an instruction set of 91 instructions. The op-code to implement the instruction set
should be at least
1. 6 bit b. 7 bytes c. 7 bit d. 8 bit
82. A micro
programmed computer can have the following memories in its control memory unit
1.
Semiconductor ROM
2.
Semiconductor RAM
3. Magnetic
RAM
4. None of
these
83. In digital
circuits parallel operation is preferred because
1. It
requires less memory
2. Circuitry
is simple
3. It is
faster than series operation
4. For None
of these of the above reasons
84. SN 7401 IC is a
1. Quad 2
input NAND gate
2. Quad 2
input NAND gate with open collector output
3. Quad
single input NAND gate with open collector output
4. None of
these
85. What is the
binary code of (26)?
1. 11001 b. 10001 c.
11010 d. 10100
86. The basic RS
flip flops is
1. A bistable
multivibrator
2. A
monostable multivibrator
3. An astable
multivibrator
4. None of
these
87. The input
impedance of an operational amplifier is
1. Very small
2. Zero
3. Very high
but not infinite
4. Infinite
88. Sn 7411 is
1. OP.amp.
monolithic and short circuit protection in-built
2. Two input
NAND gate
3. Three
input NAND gate with open collector output
4. None of
these
89. The output
voltage of an operational amplifier is
1. 90 deg out
of phase from the input
2. 90 deg out
of phase from the input
3. 45 deg out of phase from the input
4. 180deg out
of phase from the input
90. The equivalent
octal number of (492) is
1. 574 b. 547 c. 754 d. 758
91. The equivalent
decimal number for gray code 1011 is
1. 14 b. 13 c.
41 d. 31
92. The output will be only if all inputs go to 1 in
case of
1. OR
gate b. AND gate c. NAND gate d. NOT gate
93. Which of the
following circuits is known as half adder?
1. AND
circuit
2. OR circuit
3. Exclusive
OR circuit
4. None of
these
94. Which of the
following memories is used to store variable quantities of the data?
1. RAM b. ROM
c. PROM d. EPROM
95. Large scale
Integrated (LSI) circuits usually contain
1. Less than
10 gates
2. 10 to 100
gates
3. more than 100 gates
4. more than
1000 gates
96. The Boolean
expression A + AB + B on simplification
can be reduced to:
1. 0 b. 1 c. A + B d. A + B
97. For realizing a
decade counter using flip-flops the minimum number of flip-flops required is
1. 4 b. 5 c. 6 d. 10
98. Which logic
family is widely used in SSI & MSI applications?
1. ECL b. DTL c. TTL d. None of these
99. An amplitude
modulation detector detects
1. The peak
value of the modulation signal
2. The
envelop of the modulation signal
3. The peak
value of the carrier signal
4. The
average value of the carrier signal
100. Microwave (MW)
links are generally preferred to coaxial cable for TV transmission because:
1. They have
less overall phase distortion
2. They are
cheaper
3. Of their
greater bandwidth
4. Of their
relative immunity to impulse noise.
