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Q.1
For a plate-modulated class C amplifier the plate supply voltage is E. The maximum plate cathode voltage could be almost high as
2E
3E
4E
6E
Q.2
In Pulse Code Modulation system
Large bandwidth is required
Quantising noise can be overcome by companding
Quantising noise can be reduced by decreasing the number of standard levels
Suffers from the disadvantage of its incompatibly with TDM
Q.3
One of the advantages of base modulation over collector modulation of a transistor class C amplifier is
Improved efficiency
Better linearity
High power output per transistor
The lower modulating power requirement
Q.4
As per Shannon-Hartley theorem, a noise less Gaussian channel has
Zero capacity
Infinite capacity
Small capacity
None of the above
Q.5
In a TV receiver antenna the length of reflector rod
Is the same as that of dipole
Is less than that of dipole
Is more than that of dipole
May be equal, more or less than that of dipole
Q.6
Which of the following does not cause losses in optical fibre cables?
Stepped index operation
Impurities
Microbending
Attenuation in glass
Q.7
In a FM receiver, amplitude limiter
Amplifiers low frequency signals
Reduces the amplitude of signals
Eliminates any change in amplitude of received FM signals
None of the above
Q.8
The direction of rotation of a CD is
Clockwise
Anticlockwise
Clockwise or anticlockwise depending on frequency of data stored
Mostly anticlockwise but some times clockwise
Q.9
A woofer should be fed from the input through a
Low pass filter
High pass filter
Band pass filter
Band stop filter
Q.10
Fourier analysis indicate that a square wave can be represented as
A fundamental sine wave and odd harmonics
A fundamental sine wave and even harmonics
A fundamental sine wave and harmonics
Fundamental and subharmonic sine waves
Q.11
If sampling is done at the rate of 10 kHz. The bandwidth required is
35 kHz
70 kHz
10 kHz
1280 kHz
Q.12
An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are
200 and 1.01
200 and 10.01
200 and 100.1
200 and 200
Q.13
DVD uses
Laser beam for both recording and playback
Laser beam for recording and video head for playback
Video head for recording and laser beam for playback
None of the above
Q.14
Leak type bias is used in plate modulated class C amplifier to
Increase the bandwidth
Prevent over modulation
Prevent excessive grid current
Prevent tuned circuit damping
Q.15
FM transmitting and receiving equipment as compared to AM equipment is
Costly
Cheaper
Almost equally costly
None of the above
Q.16
The characteristic impedance of a twin wire feeder used for TV signals is about
1000 ohm
500 ohm
300 ohm
100 ohm
Q.17
Which of the following is an indirect way of generating FM?
Armstrong modulator
Varactor diode modulator
Reactance FET modulator
Reactance bipolar transistor
Q.18
If output power of a radio receiver is doubled, its volume is increased by __________ dB.
2
3
1
-3
Q.19
For AM receivers the standard IF frequency is
106 kHz
455 kHz
1.07 MHz
10.7 MHz
Q.20
In EM waves, polarization
Is always vertical in an isotropic medium
Is caused by reflection
Is due to transverse nature of waves
Results from longitudinal nature of waves
Q.21
The frequency range of 300 kHz to 3000 kHz is known as
Low frequency
Medium frequency
High frequency
Very high frequency
Q.22
In practical commercial FM system, channel bandwidth is
150 kHz
100 kHz
88 MHz
108 MHz
Q.23
For attenuation of high frequencies we should use
Shunt capacitance
Series capacitance
Inductance
Resistance
Q.24
A modem is classified as low speed if data rate handled is
Upto 100 bps
Upto 250 bps
Upto 400 bps
Upto 600 bps
Q.25
Circular polarization
Is useful in reducing depolarization effect on received wave
Involves critical alignment of transmitting and receiving antenna
Is useful in discrimination between reception of adjacent beams
None of the above
Q.26
PAM stands for
Pulse Analogue Modulation
Phase Analogue Modulation
Pulse Amplitude Modulation
Phase Amplitude Modulation
Q.27
VSB modulation is preferred in TV because
It reduces the bandwidth requirement to half
It avoids phase distortion at low frequencies
It results in better reception
None of the above
Q.28
For attenuation of high frequencies we should use
Shunt capacitance
Series capacitance
Inductance
Resistance
Q.29
A woofer should be fed from the input through a
Low pass filter
High pass filter
Band pass filter
Band stop filter
Q.30
DVD uses
Laser beam for both recording and playback
Laser beam for recording and video head for playback
Video head for recording and laser beam for playback
None of the above
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