| Post Name | ENGINEERING ASST.(ELEC.) / OVERSEER GR.I (ELEC.) - PWD (ELEC. WING) |
|---|---|
| Question Paper Code | 137/2021 |
| Category Code | 192/2019 |
| Date of Test | 28 December 2021 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
A semiconductor has _______ valence electrons.
Answer
C. 4
2
In a ______ the energy gap between the conduction band and valence band of a
substance is of the order of 0.7 eV
Answer
B. semiconductor
3
In a Zener regulator, change in load current produces change in _______
Answer
A. Zener current
4
Maximum efficiency of a half wave rectifier is ______
Answer
C. 40.6%
5
A center tap full wave rectifier consists of _______ diodes.
Answer
B. 2
6
What is the type of filter shown in the figure?
V in V out
R
C
Answer
A. Low pass filter
7
In a transistor there are ______ depletion layers.
Answer
B. 2
8
If the value of Ξ± in a transistor is 0.9, then value of b is ______
Answer
A. 9
9
Where should be the bias point set in order to make transistor work as an amplifier?
Answer
A. active
10
Each question is provided with four choices
Answer
C. and
11
Which among the following does not belong to the category of LC oscillators?
Answer
C. crystal oscillator
12
The channel of a JFET is between the ______
Answer
D. drain and source
13
Choose the correct statement
Answer
C. MOSFET is a unipolar, voltage controlled, three terminal device
14
What are the working regions of a unijunction transistor?
Answer
Question Cancelled
15
Which of the following is/are optoelectronic devices?
Answer
D. all of the above
16
An optocoupler provides _______ between input and output
Answer
C. isolation
17
Clamping is the process of introducing a/an ______
Answer
B. dc level to an ac signal
18
A square wave oscillator is a/an ______ multivibrator.
Answer
A. astable
19
The Op-amp can amplify ______
Answer
C. both dc and ac signals
20
The common-mode voltage gain of an Op-amp is _______
Answer
B. smaller than differential voltage gain
21
What is the feedback factor of voltage follower circuit?
Answer
B. unity
22
The internal circuitry of the 555 timer consists of _____, an R-S flip-flop, a transistor
switch, an output buffer amplifier, and a voltage divider.
Answer
D. two comparators
23
The 7912 regulator IC provides _______
Answer
D. β12v
24
The fastest A/D converter is _______ ADC
Answer
Question Cancelled
25
What is the disadvantage of binary weighted type DAC?
Answer
B. requires wide range of resistors
26
The phase velocity of a waveguide at cutoff frequency is
Answer
C. Infinite
27
For a short circuited loss-less line having length less than a quarter wavelength will
have input impedance
Answer
A. Purely Inductive
28
The main reason for occurring of standing waves is due to
Answer
Question Cancelled
29
The speakers which cover the frequencies from 16Hz to 1000Hz are called
Answer
Question Cancelled
30
The ratio of the current or voltage entering the network to the current or voltage
leaving the network is known as
Answer
B. Propagation Constant
31
A number of identical parallel antennas arranged along a line perpendicular to the line
of array axis and each element fed with current of equal magnitude and same phase
is known as
Answer
A. Broad side array
32
RF amplifier in a super heterodyne receiver is used to
Answer
D. increase rejection of the image frequency
33
In TV circuits the equalizing pulses are sent during
Answer
B. horizontal retrace
34
Frequencies in the UHF range are normally propagated by
Answer
A. space waves
35
An example for multiband HF receiving antenna is
Answer
D. log periodic
36
A PIN diode is
Answer
B. used as a microwave switch
37
The modulation system which is commonly used in telegraphic communication is
Answer
C. frequency-shift keying
38
The code which is used for parity checks is
Answer
Question Cancelled
39
The transmission rate of data in a modem is measured in
Answer
C. bits per second
40
The On-Off keying method of data transmission is otherwise known as
Answer
A. ASK
41
The type of microphone used in telephone is
Answer
D. Carbon microphone
42
The type of noise which is having greater impact at high frequencies is
Answer
C. transit-time noise
43
Which of the following modulation system is the most noise resistant one?
Answer
C. PCM
44
The reason for Rayleigh scattering loss in optical fibre is
Answer
Question Cancelled
45
Quantizing noise occurs in
Answer
C. pulse-code modulation
46
The main disadvantage of CW Doppler radar is
Answer
A. does not give target range
47
The circuit that separates sync pulses from the composite video waveform is
Answer
B. a clipper
48
Optical fibres used for communication purpose are mostly fabricated using
Answer
A. Silica
49
Which expression is true for open-circuit parameters?
Answer
C. Vβ = ZββIβ + ZββIβ
50
The A scope displays
Answer
D. the target range only
51
According to Kepler's law, the orbit of any smaller body about a larger body is
always _______
Answer
C. Ellipse
52
Perigee is
Answer
B. the point on the satellite orbit nearest to the centre of earth
53
The inclination of a retrograde orbit lies between
Answer
B. 90Β° and 180Β°
54
Geosynchronous orbit is at a distance of _______ above the surface of the earth
Answer
D. 35786 KM
55
The project Iridium is the most important application of
Answer
A. LEO satellites
56
'The apogee and perigee are always exactly opposite to each other' β the statement is
Answer
A. True
57
The basic cassegrain antenna consists of
Answer
C. a main paraboloid and a sub reflector which is hyperboloid
58
Denoting the focal distance of a parabolic reflector by 'p' and focal length 'f' then the
Space Attenuation Function (SAF) is given by
2
Answer
D. ) β
p p
59
Satellites known as 'spinners' are used for
Answer
B. Attitude control
60
Station keeping is applicable for
Answer
A. Orbit control of Geostationary satellites
61
The system which allows the antenna to handle transmit or receive signals
simultaneously is known as
Answer
Question Cancelled
62
Which was the first communication satellite placed in the Geostationary orbit?
Answer
Question Cancelled
63
The series of interconnected units which forms a single communication channel
between transmit and receive antennas in a communication satellite is known as
Answer
C. Transponders
64
The TV system employs a single outdoor unit so that all channels are made available
simultaneously at the indoor receiver is named as
Answer
D. CA TV
65
The ascending nodes of orbits in the GPS constellation are separated by ______ and
the inclination of each orbit is ______
Answer
B. 60Β°, 55Β°
66
'The passive satellite cannot generate power of its own and it reflects the incident
power'; the statement is
Answer
A. True
67
Which co-ordinate system is used with GPS system?
Answer
C. Geocentric-equatorial coordinate system
68
The effects of eclipse does not affect the operation of Geostationary satellite, if the
satellite longitudes are _______ of earth station.
Answer
D. West
69
Solar panels in satellites are arranged in the form of ______ to obtain high power.
Answer
C. rectangular solar sails
70
The system which transmits information about the satellite to earth station and
receives command signals from the earth station is known as
Answer
B. TT & C
71
The temperature extremes experienced from solar flux and cold background of deep
space can be minimized by
Answer
A. Spinning satellites
72
'Space Transportation System (STS) is an expendable launch vehicle' β the
statement is
Answer
B. False
73
Which band of frequencies are used for the satellite services in MSAT?
Answer
D. L-band
74
In
Answer
C. band, the nominal up link and downlink frequencies are
75
The conditions required for an orbit to be geostationary
Answer
B. the orbit must be circular
76
First version of GSM used
Answer
B. 124 full duplex channels
77
The minimum distance which allows the same frequency to be reused will depend on
Answer
D. All of the above
78
Transmission power of a cell has to be limited in order to
Answer
B. Avoid interference with the next cell using the same frequency
79
The time over which a call is made within a cell without handoff is called ______
Answer
B. dwell time
80
In fast fading
Answer
B. Coherence time is lesser than symbol period
81
In FDM, frequency band overlapping is avoided using
Answer
A. Guard band
82
In a cell, which is the radio channel used for transmission of call setup, call request
and call initiation _______?
Answer
B. Control channel
83
The handoff operation involves
Answer
C. Identifying a new base station and reallocating the channels with the new base
station.
84
Code Division multiple access scheme is based on
Answer
C. Spread spectrum technology
85
Delay spread is due to
Answer
A. Multipath reflection
86
Which of the following is true in a DECT system?
Answer
D. All of the above
12 137/2021
87
The channel capacity may be improved by using
Answer
A. Cell splitting
88
If bandwidth over which the channel has constant gain and linear phase response
is smaller than the bandwidth of the transmitted signal, the received signal
undergoes _______
Answer
C. Frequency selective fading
89
_______ is a dynamic database which stores all important information needed for
users currently associated to the MSC.
Answer
B. VLR
90
In mobile communication, the commonly used shape of a cell is hexagon because
Answer
D. All of the above
91
Which of the following multiple access scheme is using soft handover?
Answer
D. CDMA
92
The operation subsystem of GSM has OMC, AuC and EIR. Here EIR stands for
Answer
B. Equipment identity register
93
Crosstalk from two different radio transmitters using the same channel may result
in _______.
Answer
C. Co-channel interference
94
______ resolves the problem of limited radio spectrum.
Answer
B. cell splitting
95
The statistical measure of the range of frequency over which the channel can be
considered flat is known as _______
Answer
C. Coherence bandwidth
96
In a GSM system identify the function of MSC.
Answer
D. All of the above
97
In GSM _____ is used to separate uplink and downlink
Answer
B. FDD
98
Suppose there are N cells in a cellular system and each cell is allocated K channel the
total number of available channel is given by
Answer
Question Cancelled
99
Before a subscriber can use any service from GSM network, he must be authenticated.
This authentication is based on _______
Answer
B. SIM
100
Near-far effect is a severe problem in wireless networks using ______
Answer
D. CDMA
______________
14 137/2021
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