Comparison Between PM and AM MCQ’s

This set of Analog Communication Multiple Choice Questions & Answers (MCQs) focuses on “Comparison Between PM and AM”.

1. In frequency modulation, noise gets decreased if we decrease deviation.
a) True
b) False

2. Which device is most commonly used for detection in radio receiver?
a) Triode
b) Capacitor
c) Diode
d) Transistor

3. Which of the following oscillator is not used in frequency modulation?
a) Colpitts Oscillator
b) Crystal Oscillator
c) Hartley Oscillator
d) Both Colpitts and Crystal Oscillator

4. ________ modulator is an indirect way of generating FM.
a) Varactor FET
b) Reactance FET
c) Armstrong
d) Reactance bipolar transistor

5. The household radio receiver uses __________ detector.
a) Synchronous
b) Coherent
c) Radio
d) Envelope

6. If the step size of a system is 0.0721, find its quantization power?
a) 3.25 x 10-3
b) 4.33 x 10-4
c) 4.33 x 10-2
d) 3.25 x 10-1

7. Three point tracking is achieved by __________
a) Double conversion
b) Variable selectivity
c) Variable Sensitivity
d) Padder capacitor

8. High IF in superheterodyne receiver ____________
a) improves fidelity
b) improves selectivity
c) improves sensitivity
d) increases tracking problems

9. Find the step size of a signal with peak to peak amplitude of 8V and is quantized into 40 levels?
a) 0.8
b) 1
c) 0.2
d) 0.6

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