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.Management Sciences
Category: Modulation and Demodulation
The function of ferrite antenna is to_________________?
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A. Reduce stray capacitance
B. Stabilise d.c. bias
C. Increase the Q of tuned circuit
D. Reduce noise
The IF is 455 kHz. If the radio receiver is tuned to 855 kHz, the local oscillator frequency is _______________?
A. 455 kHz
B. 1310 kHz
C. 1500 kHz
D. 1520 kHz
In a radio receiver, noise is generally developed at _______________?
A. IF stage
B. Receiving antenna
C. Audio stage
D. RF stage
The major advantage of FM over AM is__________________?
A. Reception is less noisy
B. Higher carrier frequency
C. Smaller bandwidth
D. Small frequency deviation
In TV transmission, picture signal is ______________ modulated?
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
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