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.Management Sciences
Category: Modulation and Demodulation
In amplitude modulation, the _____________of carrier is varied according to the strength of the signal?
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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
In superhetrodyne receiver, the input at mixer stage is________________?
A. IF and RF
B. RF and AF
C. IF and AF
D. RF and local oscillator signal
Overmodulation (amplitude) occurs when signal amplitude is _____________ carrier amplitude?
A. Equal to
B. Greater than
C. Less than
D. None of the above
In an AM wave useful power is carrier by ______________?
A. Carrier
B. Sidebands
C. Both sidebands and carrier
D. None of the above
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
In radio transmission, the medium of transmission is ________________?
A. Space
B. An antenna
C. Cable
D. None of the above
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