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GATE EC 2020: Communication System Quiz 3 (App update required to attempt this test)
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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
Resonant frequency of a Tuned RF receiver is at 2 MHz and its bandwidth is 10 kHz. However due to some anomalies in the circuit, its actual bandwidth is found to be 8 kHz. What is the error while the Q-factor of the circuit is being calculated?
Question 3
A radio antenna pointed in a direction of the sky has a noise temperature of 50 kHz. The antenna feeds the received signal to the preamplifier which has a gain of 35 dB over a bandwidth of 10 MHz and a noise figure of 2 dB. Then the noise power at output of the preamplifier is _____(pW)
Question 4
A receiver is operated at a temperature of 300K. Transistor used in receiver has output resistance of 2KΩ. What is the value of thermal noise voltage (in μV) in receiver with a bandwidth of 300kHz.
Question 5
A superhetrodyne receiver operates in the frequency range 450 kHz-1350 kHz, with the intermediate frequency of 450 kHz. If R = Cmax/Cmin denotes the required capacitance ratio of the local oscillator and I denote the image frequency (in kHz) of the incoming signal. If the receiver is tuned to 800 kHz, then
Question 6
A superheterodyne receiver having an RF amplifier and intermediate frequency of 450 kHz is tuned to 15 Mhz. If the image rejection ratio is given by 12, the quality factor is _______.
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Oct 13ESE & GATE EC
