| Post Name | WORKSHOP INSTRUCTOR/ INSTRUCTOR GR.II/ DEMONSTRATOR IN ELECTRONICS ENGG. - TECH. EDUN |
|---|---|
| Question Paper Code | 068/2023 |
| Category Code | 677/2022 |
| Date of Test | 12 June 2023 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
The mobility of electrons in a semiconductor is defined as the
Answer
C. Drift velocity per unit electric field
2
In an intrinsic semiconductor, the free electron concentration depends on
Answer
D. Temperature of the semiconductor
3
Silicon is not suitable for fabrication of lEds, because it is
Answer
B. An indirect band gap semiconductor
4
A CRO is used to measure phase displacement
Answer
A. 1, 2 and 4 only
5
The diffusion length of a carrier depends on
Answer
C. The mobility and lifetime of the carriers
6
In an n-type semiconductor, as temperature increases, the Fermi level
Answer
B. moves towards middle of forbidden energy gap
7
Barrier potential in a PN junction is caused by
Answer
B. diffusion of majority carriers across the junction
8
The change in barrier potential of a silicon PN junction with temperature is
Answer
A. 0.0025 volts per degree C
9
Consider a PN junction in which the P side is ten times more heavily dopped than N
side. The depletion region would extend
Answer
C. more towards the N side and less towards the P side
10
Negative resistance characteristics is exhibited by a
Answer
D. Tunnel diode
11
The zener breakdown voltage __________ as temperature is increased.
Answer
A. decreases
12
Varactor diodes are used in
Answer
D. All of the above
13
In a tunnel diode, impurity concentration is of the order of
Answer
A. 1 in 103
14
The ripple factor of power supply is a measure of
Answer
Question Cancelled
15
Transformer utilization factor of a full wave rectifier is
Answer
Question Cancelled
16
Peak inverse voltage of each diode in a bridge rectifier is
Answer
A. Vm
17
For the capacitor filter, under no load condition, the ripple is
Answer
B. 0
18
In the diode volt ampere characteristics what will be the resistance, if a slope is drawn
between the voltages 50 to 100 and corresponding current 5 to 10 ?
Answer
C. 10 Ω
19
In a zener regulator, the change in load current produces, change in
Answer
B. Zener current
20
For a filter, no load output voltage is 300 V and full load output voltage is 280 V.
The regulation of the circuit is
Answer
D. 7.1%
21
A series lCR circuit is resonant at 150 kHz and has a Q of 50. The lower half power
frequency is
Answer
B. 148.5 kHz
22
A 220 V dC motor has an armature resistance of 0.5 Ω and the full load armature
current of 20 A, then the back emf induced is
Answer
A. 210 V
23
Transformers are rated in KVA, because they are working with
Answer
D. Varying power factor
24
In slip ring induction motor which type of speed control is used ?
Answer
A. Rotor rheostat
25
Superposition theorem can be applicable only to circuits having __________
element.
Answer
C. linear bilateral
26
Determine the value of V_EE in a UJT which causes the UJT to turn off, R_E = 1 kΩ, I_V = 10 mA.
Answer
Question Cancelled
27
Turn off of SCR is usually measured from the instant
Answer
A. Anode current become zero
28
Operating frequency of an IGBT is around
Answer
B. less than 50 kHz
29
For a given input signal to the relay circuit what is the minimum value of output voltage
Answer
C. –12 V
30
While doing base width modulation in BJT (NPN)
Answer
C. VCB is reverse biased and variable
31
For a given emitter current the collector current can be increased by
Answer
A. By reducing the recombination in base region
32
Width of the conductions channel in mOSFET is
Answer
A. large at source side and decreasing at drain end
33
Pinch off voltage of JFET is
Answer
C. The drain to source voltage at which the drain current start to saturate
34
When latch up occurs in IGBT
Answer
A. IC is no longer controllable
35
Secondary breakdown occur in BJT due to
Answer
A. Negative temperature coefficient of resistance
36
Which one of the following device is not a switched mode dC power supply ?
Answer
A. Resistant converter
37
SmPSs are widely used than linear power supply due to
Answer
A. Size and efficiency
38
An AC lVdT has ________ input and _______ output.
Answer
B. AC, AC
39
No contact is made between armature and core in
Answer
D. Unguided armature lVdT
40
As per Stefan’s law of radiation heat reduced by a body surfaces is
Answer
B. directly proportional to the 4th power of its absolute temperature
41
With Wheatstone bridge we can measure the resistance of _______ range.
Answer
B. 1 Ω to a few megaohms
42
The types of faults in a telephone line are
Answer
C. line to line or line to ground
43
Which of the following statement are incorrect ?
1. The main part of CRO is CRT
2. ACRO can be used for direct measurement of power
3. Time base generator is a part of CRT
4. ACRO is used to measure phase displacement
Answer
B. 2 and 3 only
44
A circle is seen on the screen of a CRO when two time varying signals of same
frequency and same magnitude are applied to X and y plates of CRO. The relative
phase difference is :
Answer
B. 90°
45
Which of the following modes of operation allows you to change the processor
mode from a program/operator device and perform online program editing using
programmable logic control ?
Answer
A. REm mode
46
Which of the following statement is not correct with IC741 ?
Answer
Question Cancelled
47
An operational amplifier is labelled as LM741. The manufacturer’s designation of
the given IC is
Answer
Question Cancelled
48
If a capacitor is placed in the feedback path of an op-amp circuit, then the circuit
act as
Answer
D. Integrator
49
If A_DM = 3500 and A_CM = 0.35, the CMRR is
Answer
C. 10000
50
The common mode voltage gain of a differential amplifier is equal to RC divided by
Answer
D. 2RE
51
An operational amplifier with a gain of –10 and input resistance (Ri) equal to 10 kΩ,
the feedback resistance (Rf) is
Answer
A. 100 kΩ
52
In which state the Pll tracks any change in input frequency is at
Answer
D. locked Range
53
Which of the following statement is correct for 555 IC timers ?
i. It operates in single mode
ii. It operates in two modes
iii. It operates in three modes
iv. It operates in four modes
Answer
B. Only iii
54
What instrument is used to amplify the output signal of a transducer ?
Answer
Question Cancelled
55
In a R-2R ladder dAC, the typical value of R ranges from
Answer
B. 2.5 kΩ to 10 kΩ
56
Which of the following oscillator can be used where high stability of frequency is
required ?
Answer
D. Crystal Oscillator
57
Find the frequency of oscillation of a Wien Bridge Oscillator with R = 20 kΩ and
C = 0.0010 µF.
Answer
A. 7.96 kHz
58
The output of an oscillator oscillates between OFF and ON stages freely, it is called
Answer
C. Astable multivibrator
59
A Schmitt trigger achieves hysteresis by utilising
Answer
C. Re-generate positive feedback
60
Which of the following criteria should be satisfied in order to use an amplifier is an
oscillator ?
Answer
A. Aβ = 1
61
Which of the following is the hexadecimal equivalent of the binary number
10100110101111 ?
Answer
B. 29AF
62
Which of the following code is used for labelling the cells of a Karnaugh map
(K-map) ?
Answer
C. Gray Code
63
The figure of merit of a logic family is often measured in the unit of
Answer
A. Pico joules
64
The decimal equivalent of the octal number 6327.4051 is
Answer
A. 3287.5100098
65
In a half adder the carry output is high, if the inputs are :
Answer
Question Cancelled
66
How many flip-flops are required to construct a mod-32 counter ?
Answer
D. 5
67
The minimum number of 2 input NANd Gates required implementing a 2 input XOR
gate is
Answer
B. 4
68
State the correct statement for 8051 architecture.
Answer
D. dPTR 16 bit, PC 16 bit, CPU 8 bit, PSW 8 bit, SP 8 bit
69
After reset SP register is initialized to address
Answer
C. 7 H
70
Which among the following is not a feature of RAm ?
Answer
C. data remains even after power supply is not present
71
ROm is ________ and ________
Answer
B. non-volatile, permanent
72
In TTl family high output corresponds to
Answer
B. 2.4V to 5V
73
Which TTl family offers lowest power and the fastest operation ?
Answer
D. low power Schottkey TTl
74
In a J-K flip flop, when J = 1 and K =1, then it will be considered as
Answer
B. Toggle condition
75
Which of the following memories uses one transistor and one capacitor as a basic
memory unit ?
Answer
A. dRAm
76
In the Vidicon camera tube the material which is coated on the very thin metallic film
called signal plate is of _____________ nature.
Answer
B. Photo conductive
77
An example for audio file format is
Answer
Question Cancelled
78
The woofer system that is used only in the lower part of the audio spectrum is known as
Answer
C. Subwoofer
79
In a dVd recording and playback is done by
Answer
A. laser beam for both recording and playback
80
In TV transmission separation of sync pulses from the composite video waveform is
done by
Answer
Question Cancelled
81
The modulation process in which the carrier wave is continuous in nature is known as
Answer
B. Analog modulation
82
In amplitude modulation radio broadcast the maximum modulating signal frequency
used is
Answer
B. 5 kHz
83
The circuit which is used in Fm receiver to remove noise present in the peak of
received signal is
Answer
Question Cancelled
84
The probability density function of thermal noise is
Answer
B. Gaussian
85
UHF range frequencies normally propagates by means of
Answer
A. space waves
86
For tracking of satellites at very high frequency helical antennas are used due to
Answer
D. Faraday’s effect
87
QPSK is a modulation scheme where each symbol consists of
Answer
B. 2 bits
88
The method used for demodulating Fm wave is
Answer
D. Phase discrimination
89
In a linear broadside antenna array with half wave length spacing the directivity is equal to
Answer
D. Number of elements present in array
90
Which one of the following is the mode of propagation used in HF antennas ?
Answer
A. Ionospheric
91
PAm signal is detected using
Answer
A. Low pass filter
92
The antenna parameter beam width indicates
Answer
C. directivity
93
What is the impedance of the folded dipole antenna ?
Answer
C. 300 Ω
94
The charge carriers random behaviour is the reason for the generation of
Answer
A. Shot noise
95
In an Amplitude modulation circuit, the emitter modulator amplifier operates in
Answer
A. Class A mode
96
The number of 16-bit timers in 8051 are
Answer
B. 2
97
An event that indicates the microcontroller that a device needs its service is
Answer
A. Interrupt
98
The number of special function registers in 8051 microcontrollers are
Answer
A. 21
99
In 8051 microcontroller all the interrupts are enabled or disabled using the bit
Answer
C. EA
100
When 8051 comes on then the address 0x00 is loaded to which register ?
Answer
D. PC
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