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GATE 2019: Communication Quiz 3

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Question 1

A superheterodyne receiver is designed to receive transmitted signal between 5 and 10 MHz. High side tuning is to be used. The tuning Range of the local oscillator fan IF freq. 500 KH2 would be

Question 2

A super heterodyne receiver uses an IF frequency of 400kHz and is tuned to2000kHz career. Image frequency of such receiver is:

Question 3

A satellite receiver with noise figure of 5.6 dB has a bandwidth of 16 kHz and consist of a preamplifier with noise temperature 147 K and a gain of 30 dB. If the reference temperature is 297 K the equivalent noise temperature of the receiver is

Question 4

An AM signal is represented as  
Where
with regards to this signal which of the following statement is true :
1) The spectrum consists of 8 spectral component.
2) The bandwidth of the signal is 20 KHz
3) The total modulated index is 0.707
4) The modulation efficiency is 5

Question 5

In a super heterodyne receiver, the mixer translates the carrier frequency to a fixed IF of 10.8 MHz by using local oscillator of frequency . What should be the range of tuning provided in the local oscillator such that assume broadcast frequency range to be 88.5 MHz-108 MHz.

Question 6

A superheterodyne receiver is to operate in the frequency range 550 kHz - 1650 kHz, with the intermediate frequency for 450 kHz. Let denotes the required capacitance ratio of the local oscillator and 1 denote the image frequency (in kHz) of the incoming signal. If the receiver is tuned to 700 kHz, then
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Jan 12ESE & GATE EC