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Quiz 4
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Q.1
Assertion (A): In FM the frequency of the carrier is varied by the modulating voltageReason (R): FM and PM are two forms of angle modulation.
Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct
Q.2
Full duplex operation permits transmission in both directions at the same time.
True
False
Q.3
In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then
Amplitude of distant sidebands decreases
Amplitude of distant sidebands increases
Amplitude of distant sidebands remains constant
Amplitude of distant sidebands first increases, then decreases
Q.4
The modulation index of an FM is changed from 0 toHow does the transmitted power change?
Gets halved
Gets doubled
Gets increased by 50 percent
Remains unchanged
Q.5
For a given carrier wave, maximum undistorted power is transmitted when value of modulation is
1
0.8
0.5
0
Q.6
In TV systems, equalising pulses are sent during
Horizontal blanking
Vertical blanking
Serrations
Horizontal retrace
Q.7
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.8
In Modulation, “carrier” is
Resultant wave
Speech voltage to be transmitted
Voltage with constant frequency, phase or amplitude
Voltage for which frequency, phase or amplitude is varied
Q.9
If in a broadcasting studio, akHz carrier is modulated by an audio signal of frequency range 100-kHz, the width of channel is __________ kHz.
5
4.9
995
10
Q.10
Which one of the following is analog?
PCM
PWM
Delta modulation
Differential PCM
Q.11
For AM receivers the standard IF frequency is
106 kHz
455 kHz
1.07 MHz
10.7 MHz
Q.12
FM transmitting and receiving equipment as compared to AM equipment is
Costly
Cheaper
Almost equally costly
None of the above
Q.13
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.14
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
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