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GATE EC 2022: Communication System Quiz 3

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Question 1

A super heterodyne receiver uses an IF frequency of 455 kHz. The receiver is tuned to a transmitter having a carrier frequency of 1120 kHz. The permissible frequencies of the local oscillator are

Question 2

An FM signal with a deviation δ is passed through a mixer and has its frequency reduced fivefold. The deviation in the output of the mixer is

Question 3

A super heterodyne receiver is designed to receive transmitted signals between 5 and 10 MHz. High – side tuning is to be used. The tuning range of the local oscillator for IF frequency 500 kHz would be

Question 4

A super heterodyne receiver is to operate in the frequency range 550 kHz – 1650 kHz, with the intermediate frequency of 450 kHz. Let r = Cmax / Cmin denote the required capacitance ratio of the local oscillator and f’c denote the image frequency (in kHz) of the incoming signal. If the receiver is tuned to 700 kHz, then

Question 5

A super heterodyne FM receiver operates in the frequency range of 88 – 108 MHz. The IF and local oscillator frequency are chosen such that fIF < fLO. The image frequency must fall outside of the 88 – 108 MHz region. The range of variation in fLO is

Question 6

A super heterodyne receiver uses an IF frequency of 455 kHz. The receiver is tuned to a transmitter having a carrier frequency of 2400 kHz. High – side tuning is to be used. The image frequency will be _ _ _ _ _ _ _ _ kHz.
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Oct 9ESE & GATE EC
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