Download Aptitude Crack
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Radio Receivers - Engineering

Q1:

Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver?

A Variable selectivity

B Variable sensitivity

C Double conversion

D Squelch

ANS:B - Variable sensitivity

A received signal obviously has very low voltage amplitudes that's why you need variable sensitivity for the receiver to detect up to the weakest signal to be boosted using amplifiers. This is needed for the fidelity or having the exact replica of the transmitted signal.