Communication Receivers MCQ’s

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This set of Avionics Multiple Choice Questions & Answers (MCQs) focuses on “Communication Receivers”.

1. What circuit provides the initial selectivity in a receiver?
a) Amplifier
b) Attenuator
c) Multiplexer
d) LC tuned circuits

2. The ability to pick up week signals by a receiver is called _________
a) Gain
b) Amplification
c) Sensitivity
d) Selectivity

3. Which of the following are the two main characteristics of receivers?
a) Selectivity and sensitivity
b) Gain and attenuation
c) Modulation and demodulation
d) Multiplexing and demultiplexing

4. What is the input signal level that is approximately equal to the average internally generated noise value called?
a) MDS
b) MBS
c) MMD
d) MSD

5. A sensitive and selective receiver can be made using only amplifiers, selective filters, and a demodulator.
a) True
b) False

6. What is the output of a mixer circuit?
a) Sum of frequencies
b) Difference of frequencies
c) Sum and difference of frequencies
d) Multiplication of frequencies

7. Analog signals : Signal to noise ratio:: Digital signals _________
a) Signal Attenuation
b) Bit error rate
c) Error rate
d) Digital noise ratio

8. What type of receivers converts all incoming frequency into a lower frequency for better selectivity and sensitivity?
a) Analogous receivers
b) Superheterodyne receivers
c) Digital receiver
d) Crystal receiver

9. What is connected between the antenna and the mixer to avoid oscillator radiation?
a) LNA
b) Attenuator
c) Duplexer
d) Power amplifier

10. The LNA of a transducer has failed during the transmission of a signal. Which component’s failure has caused this?
a) Duplexer
b) RF amplifier
c) Antenna
d) Mixer

11. Which of the following is not an advantage of using RF amplifiers in the initial stage of signal selection?
a) Low noise
b) Reduced oscillator radiation
c) Better selectivity
d) Less power consumption

12. What type of oscillators are used to input a wide range of frequencies to the IF amplifier?
a) LC oscillators
b) Crystal oscillators
c) Variable frequency oscillators
d) Diode oscillators

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