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.Management Sciences
Category: Modulation and Demodulation
In TV transmission, picture signal is ______________ modulated?
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A. Frequency
B. Phase
C. Amplitude
D. None of the above
Modulation refers to a low-frequency signal controlling the ________________?
A. Amplitude of the carrier
B. Frequency of the carrier
C. Phase of the carrier
D. May be any of the above
In amplitude modulation, bandwidth is ____________ the audio signal frequency?
A. Thrice
B. Four times
C. Twice
D. None of the above
In TV transmission, sound signal is ______________modulated?
A. Amplitude
B. Frequency
C. Phase
D. None of the above
A high Q tuned circuit will permit an amplifier to have high __________________?
A. Fidelity
B. Frequency range
C. Sensitivity
D. Selectivity
In amplitude modulation, the _____________of carrier is varied according to the strength of the signal?
A. Amplitude
B. Frequency
C. Phase
D. None of the above
In an AM wave, the majority of the power is in _____________?
A. Lower sideband
B. Upper sideband
C. Carrier
D. None of the above
In a superhetrodyne receiver, the difference frequency is chosen as the IF rather than the sum frequency because _________________?
A. The difference frequency is closer to oscillator frequency
B. Lower frequencies are easier to amplify
C. Only the difference frequency can be modulated
D. None of the above
A 50 kW carrier is to be amplitude modulated to a level of 85%. What is the carrier power after modulation ?
A. 50 kW
B. 5 kW
C. 8 kW
D. 25 kW
The signal voltage induced in the aerial of a radio receiver is of the order of_____________?
A. mV
B. µV
C. V
D. None of the above
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