Modulation and Demodulation Quiz | Modulation and Demodulation Multiple Choice Questions and Answers

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Questions
1 In TV transmission, sound signal is ………………… modulated
A Amplitude
B Frequency
C Phase
D None of the above

Answer: Frequency
2 In a TRF radio receiver, the RF and detection stages are tuned to …………
A Radio frequency
B IF
C Audio frequency
D None of the above

Answer: Radio frequency
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3 The diode detector in an AM radio receiver is usually found ………….
A Before the first RF stage
B After the first RF stage
C After several stages of amplification
D None of the above

Answer: After several stages of amplification
4 In a superhetrodyne receiver, the difference frequency is chosen as the IF rather than the sum frequency because …………….
A The difference frequency is closer to oscillator frequency
B Lower frequencies are easier to amplify
C Only the difference frequency can be modulated
D None of the above

Answer: Lower frequencies are easier to amplify
5 In the above question, what is the power in sidebands?
A 8 kW
B 6 kW
C 06 kW
D 9 kW

Answer: 06 kW
6 A 50 kW carrier is to be amplitude modulated to a level of 85%. What is the carrier power after modulation?
A 50 kW
B 5 kW
C 8 kW
D 25 kW

Answer: 50 kW
7 A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor?
A 3
B 6
C 5
D None of the above

Answer: 6
8 In a radio receiver, we generally use ………….. oscillator as a local oscillator
A Crystal
B Wien-bridge
C Phase-shift
D Hartley

Answer: Hartley
9 The function of ferrite antenna is to …………….
A Reduce stray capacitance
B Stabilise d.c. bias
C Increase the Q of tuned circuit
D Reduce noise

Answer: Increase the Q of tuned circuit
10 If Amin = 40 and Amax = 60, what is the percentage of modulation?
A 20 %
B 40 %
C 50 %
D 10 %

Answer: 20 %
11 The IF is 455 kHz. If the radio receiver is tuned to 855 kHz, the local oscillator frequency is ………….
A 455 kHz
B 1310 kHz
C 1500 kHz
D 1520 kHz

Answer: 1310 kHz
12 Modulation refers to a low-frequency signal controlling the …………
A Amplitude of the carrier
B Frequency of the carrier
C Phase of the carrier
D May be any of the above

Answer: May be any of the above
13 When the modulating signal controls the frequency of the carrier, we get……….
A Phase modulation
B Amplitude modulation
C Frequency modulation
D May be any one of the above

Answer: Frequency modulation
14 The major advantage of FM over AM is …………..
A Reception is less noisy
B Higher carrier frequency
C Smaller bandwidth
D Small frequency deviation

Answer: Reception is less noisy
15 In superhetrodyne receiver, the input at mixer stage is ……….
A IF and RF
B RF and AF
C IF and AF
D RF and local oscillator signal

Answer: RF and local oscillator signal
16 The superhetrodyne principle provides selectivity at ………. stage
A RF
B IF
C audio
D Before RF

Answer: IF
17 The letters AVC stand for …………..
A Audio voltage control
B Abrupt voltage control
C Automatic volume control
D Automatic voltage control

Answer: Automatic volume control
18 Most of the amplification in a superhetrodyne receiver occurs at ………. stage
A IF
B RF amplifier
C Audio amplifier
D Detector

Answer: IF
19 a radio receiver amplifies all the signal frequencies equally well, it is said to have high …………
A Sensitivity
B Selectivity
C Distortion
D Fidelity

Answer: Fidelity
20 Superhertodyne principle refers to
A Using a large number of amplifier stages
B Using a push-pull circuit
C Obtaining lower fixed intermediate frequency
D None of the above

Answer: Obtaining lower fixed intermediate frequency

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