| Post Name | Workshop Instructor/ Demonstrator/ Instructor Grade II in Electronics and Communication - Technical Education |
|---|---|
| Question Paper Code | 058/2023 |
| Category Code | 679/2022 |
| Date of Test | 5 June 2023 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
An Ideal operational amplifier does not have
Answer
C. Infinite output impedance
2
The instruction mOVC A,@A+dPTR denotes an 8051 instruction in
Answer
D. Indexed addressing mode
3
The common collector current gain (Ξ³) of a Bipolar Junction Transistor is 10. The
value of its common base current gain (Ξ±) will be
Answer
C. 0.9
4
demodulation is simpler.
Select the correct answer from the code given below :
Answer
B. 1, 2 and 4
5
The figure below shows the circuit diagram of a
VCC
R 8
4
7 3 Output
555 VO
6 5
C VC 2 1 0.01 Β΅F
Trigger Input
Answer
B. monostable multivibrator
6
ln a series resonant circuit, at resonant frequency the current and voltage are
Answer
D. ln Phase
7
A Resistor with the 4 band colour code of Brown, Black, Black, Red. Its range of
value is
Answer
A. 9.8 β 10.2 β¦
8
The number of D flipflops required to implement a mod 6 Johnson counter is
Answer
B. 3
9
Which of the following is a polarized capacitor ?
Answer
C. Electrolytic
10
The upper cutoff frequency of an RC coupled amplifier is mainly due to
Answer
D. lnter electrode capacitance
11
A common-emitter transistor amplifier without an emitter-bypass capacitor has R_L = 100 kΞ©, R_E = 10 kΞ© and h_FE = 100. Its voltage gain is
Answer
D. 10
12
One of the applications of a Transformer is for
Answer
A. Impedance matching
13
An amplifier using an operational amplifier is shown below. The diagram is an inverting op-amp with R_in from V_in to the negative input, R_f in feedback from V_out, and the positive input grounded. The value of V_out/V_in is, where R_f = 10 kΞ© and R_in = 1 kΞ©
Answer
C. β 10
14
The SFR address of B register in 8051 is
Answer
B. 0F0H
15
The IC 7476 is
Answer
C. JK flipflop
16
The transistor configuration which has both voltage and current gain is
Answer
A. Common Emitter
17
In the instruction mOV A, @Ri. the register Ri may be
Answer
B. Registers R0 and R1 only
18
A Bipolar Junction Transistor
Answer
D. Current Controlled Current Source
19
Which of the following lC is a general purpose opto coupler ?
Answer
B. 4N35
20
ln a series resonant circuit, at resonant frequency the current through the capacitor
is _________ the current through the inductor.
Answer
D. equal to
21
A component which opposes sudden change in voltage is
Answer
A. Capacitor
22
The SmPS work on the principle of
Answer
B. Chopper
23
The IE register of 8051 is
Answer
B. Bit addressable register
24
The maximum input voltage and output voltage of lC regulator 7812 is
Answer
D. 35V, 12V
25
Which of the following is an active component ?
Answer
B. Transistor
26
The Gray code corresponding to the binary number 1111 is
Answer
C. 1000
27
The tolerance of a Resistor with three band colour code is
Answer
C. Β± 20%
28
ln a series resonant circuit with quality factor of 10 has a 3dB bandwidth of
100 KHz. Its resonant frequency in KHz is
Answer
A. 1000
29
Master slave configuration is used in flipflops to
Answer
C. Eliminate race around condition
30
Which of the following statements is correct for interrupt priorities in 8051 ?
Answer
D. All the above
31
The CMRR of an operational amplifier should be
Answer
C. As large as possible
32
A material with resistivity Ο Ξ©Β·m has length 1 metre and cross-sectional area 1 mΒ². Its resistance is
Answer
A. Ο Ξ©
33
If the length and radius of a resistive material are doubled
Answer
C. The resistance is halved and the resistivity remains the same
34
How many select lines are contained in a multiplexer with 2048 inputs and one
output ?
Answer
C. 11
35
A Transformer cannot raise or lower the dC voltage because
Answer
A. Faradayβs laws of Electromagnetic induction is not valid since the rate of
change of flux is zero
36
data can be changed from temporal code to spacial code by using
Answer
B. Serial-in, parallel-out, shift register
37
In an AVR, to set all the bits in a register R2 to 1, we must OR the register R2 with
Answer
C. FFH
38
ln a Pll, when the input is applied and the Voltage Controlled Oscillator (VCO) starts
to change the frequency it is said to be in
Answer
B. Capture mode
39
Which of the following is not an assembler directive in an AVR ?
Answer
D. ddR
40
The minimum number of two- input NANd gates required to realize a half subtractor
is
Answer
B. 5
41
The program
ldI R16, $FF
OUT ddRB, R16 will
Answer
A. Configure PORT B as output port
42
A 2-bit parallel counter and a 3-bit Johnson counter are cascaded. The modulus of
the cascaded configuration is
Answer
D. 24
43
The speed control of dC motor through the interfacing with 8051 can be accomplished
with
Answer
B. PWm
44
The Pll can be used for
Answer
D. All the above
45
Which one of the following have large code size and less execution time ?
Answer
B. macro
46
The phase difference between the input and output voltages of a common base
transistor amplifier is
Answer
D. 0Β°
47
The CmRR of 741OP-AmP is approximately equal to
Answer
A. 90 dB
48
Two amplifiers with voltage gains of 20 dB and 30 dB are cascaded. The overall
voltage gain of the cascaded configuration will be
Answer
C. 50 dB
49
How many inputs and outputs does a full adder circuit have ?
Answer
B. Three inputs, two outputs
50
ln a sequential circuit, output at any instant of time depends
Answer
D. On past outputs as well as present inputs
51
A crystal oscillator has
Answer
C. Substantially constant frequency of oscillations
52
Which of the following uses a split tank capacitor ?
Answer
B. Colpitts Oscillator
53
No. of RC network required to be cascaded in RC phase shift oscillator
Answer
C. Three
54
The piezoelectric effect in a crystal is
Answer
A. voltage developed because of mechanical stress
55
For good differentiator
Answer
C. Both
56
If a signal passes through an integrator, the amplitude of noise signal
Answer
C. Reduced
57
A Hartley oscillator is commonly used in
Answer
A. Radio receivers
58
Which of the following is a condition for oscillation ?
Answer
C. A phase shift around the feedback loop of zero degree
59
________ is a square wave generator.
Answer
B. Astable multivibrator
60
most suitable circuit to generate 1 KHz signal is
Answer
D. Wien Bridge Oscillator
61
Indicate the false statement. modulation is used to
Answer
A. reduce the bandwidth used
62
The modulation index of an Am wave is changed from 0 to 1. The transmitted power
is
Answer
D. Increased by 50 percent
63
Vestigial Sideband modulation is used for
Answer
B. TV broadcasting
64
In an Am wave useful power is carried by
Answer
B. Sidebands
65
Overmodulation occurs in Am, when signal amplitude is ______ carrier amplitude.
Answer
B. Greater than
66
The amount of frequency deviation in Fm signal depends on
Answer
A. Amplitude of the modulating signal
67
The modulation index of Fm is given by
Answer
A. frequency deviation / modulating frequency
68
Which modulator is used for generating DSB-SC signal ?
Answer
B. Balanced modulator
69
Which of the following modulation technique is having lowest bandwidth ?
Answer
D. SSB SC
70
Which of the following is not an advantage of FM over AM ?
Answer
B. lower bandwidth is required
71
Which one of the following blocks is not common in both AM and FM receivers ?
Answer
C. Slope detector
72
Which one of the following statement is correct ?
Noise has the greatest effect in a communication system when it interferes with the
signal
Answer
B. In the channel
73
An Am superheterodyne receiver with IF of 455 kHz is tuned to the carrier frequency
of 1000 kHz. The image frequency is
Answer
D. 1910 kHz
74
Which of the following are the advantages of FM broadcasting over AM broadcasting ?
1. Better S/N ratio.
2. Not subject to signal fading.
3. Power efficiency is superior.
4. Demodulation is simpler.
Select the correct answer from the code given below :
Answer
D. 1 and3
75
High level modulation refers to the modulation process in which
Answer
D. All of the above
76
Fm receivers using the standard 88 to 108 mHz band use IF of
Answer
C. 10.7 mHz
77
________ of a receiver is its ability to reproduce the exact replica of the transmitted
signals at the receiver output.
Answer
B. Fidelity
78
Pre-emphasis in Fm system involves
Answer
D. Amplification of higher frequency components of the modulating signal
79
Which oscillator is used as a local oscillator in radio receiver ?
Answer
C. Hartley
80
The image frequency rejection becomes poor when the intermediate frequency is
Answer
A. low
81
The smallest change in a measured variable to which an instrument will respond is
Answer
B. Resolution
82
A moving coil galvanometer is made into a dc ammeter by connecting
Answer
A. a low resistance across the meter
83
A multimeter is used for the measurement of the following.
1. Both ac and dc voltage.
2. Both ac and dc current.
3. Resistance.
4. Frequency.
5. Power.
Answer
D. 1,2 and3
84
The input impedance of a CRO is nearly
Answer
A. 1 mβ¦
85
In a CRT the highest positive potential is given to
Answer
D. post deflection acceleration anode
86
dual trace CRO uses
Answer
A. one beam
87
In a digital oscilloscope, the A/d converters are usually
Answer
Question Cancelled
88
Which amplifier is used in an electronic multimeter ?
Answer
C. Differential amplifier
89
In a 3Β½ digit 0 β 10V DVM, the most significant digit is
Answer
B. 0 or 1
90
A moving iron instrument can be used for
Answer
C. Both dC and AC
91
A message signal made of multiple frequency components has a maximum frequency
value of 10 kHz. What should be the minimum sampling frequency to sense the
information present in this signal ?
Answer
D. 20 kHz
92
Which of the following pulse modulation system is analog ?
Answer
A. PAm
93
The bandwidth requirement is high in
Answer
D. Both
94
Companding is the process of
Answer
B. Compression and Expansion
95
Name the modulation technique which requires synchronization between transmitter
and receiver.
Answer
C. PPm
96
The binary waveform used to generate BPSK signal is encoded in
Answer
A. Bipolar NRZ format
97
QPSK system uses a phase shift of
Answer
B. Ο /2
98
The technique used to reduce the sideband power is
Answer
C. Gaussian minimum shift keying
99
In BFSK, mark and space respectively represent
Answer
A. 1 and 0
100
In PCm, Noise is measured in
Answer
B. decibel
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