72 + Mcqs in Modulation And Demodulation Page 1 McqOptions

1.	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» C. 1500 kHz

Discussion

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» B. IF

Discussion

3.	The letters AVC stand for ___________
A.	Audio voltage control
B.	Abrupt voltage control
C.	Automatic volume control
D.	Automatic voltage control
Answer» D. Automatic voltage control

Discussion

4.	Overmodulation results in ___________
A.	Weakening of the signal
B.	Excessive carrier power
C.	Distortion
D.	None of the above
Answer» D. None of the above

Discussion

5.	In radio transmission, the medium of transmission is ___________
A.	Space
B.	An antenna
C.	Cable
D.	None of the above
Answer» B. An antenna

Discussion

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

Discussion

7.	In an AM wave useful power is carrier by ___________
A.	Carrier
B.	Sidebands
C.	Both sidebands and carrier
D.	None of the above
Answer» C. Both sidebands and carrier

Discussion

8.	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» D. May be any one of the above

Discussion

9.	The signal voltage induced in the aerial of a radio receiver is of the order of ___________
A.	mV
B.	µV
C.	V
D.	None of the above
Answer» C. V

Discussion

10.	If Amin = 40 and Amax = 60, what is the percentage of modulation?
A.	20%
B.	40%
C.	50%
D.	10%
Answer» B. 40%

Discussion

11.	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» D. Reduce noise

Discussion

12.	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» D. None of the above

Discussion

13.	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» E.

Discussion

14.	As the modulation level is increased, the carrier power ___________
A.	Is increased
B.	Remains the same
C.	Is decreased
D.	None of the above
Answer» C. Is decreased

Discussion

15.	In an AM wave, the majority of the power is in ___________
A.	Lower sideband
B.	Upper sideband
C.	Carrier
D.	None of the above
Answer» D. None of the above

Discussion

16.	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» B. Higher carrier frequency

Discussion

17.	In amplitude modulation, the ___________ of carrier is varied according to the strength of the signal.
A.	Amplitude
B.	Frequency
C.	Phase
D.	None of the above
Answer» B. Frequency

Discussion

18.	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» C. 5

Discussion

19.	In amplitude modulation, bandwidth is ___________ the audio signal frequency
A.	Thrice
B.	Four times
C.	Twice
D.	None of the above
Answer» D. None of the above

Discussion

20.	If 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» E.

Discussion

21.	The superhetrodyne principle provides selectivity at ___________ stage
A.	RF
B.	IF
C.	audio
D.	Before RF
Answer» C. audio

Discussion

22.	Most of the amplification in a superhetrodyne receiver occurs at ___________ stage
A.	IF
B.	RF amplifier
C.	Audio amplifier
D.	Detector
Answer» B. RF amplifier

Discussion

23.	In TV transmission, sound signal is ___________ modulated
A.	Amplitude
B.	Frequency
C.	Phase
D.	None of the above
Answer» C. Phase

Discussion

24.	In TV transmission, picture signal is ___________ modulated
A.	Frequency
B.	Phase
C.	Amplitude
D.	None of the above
Answer» D. None of the above

Discussion

25.	If modulation is 100% then signal amplitude is ___________ carrier amplitude
A.	Equal to
B.	Greater than
C.	Less than
D.	None of the above
Answer» B. Greater than

Discussion

26.	Overmodulation (amplitude) occurs when signal amplitude is ___________ carrier amplitude
A.	Equal to
B.	Greater than
C.	Less than
D.	None of the above
Answer» C. Less than

Discussion

27.	If level of modulation is increased ___________ power is increased
A.	Carrier
B.	Sideband
C.	Carrier as well as sideband
D.	None of the above
Answer» C. Carrier as well as sideband

Discussion

28.	In a transmitter ___________ oscillator is used
A.	Hartley
B.	RC phase-shift
C.	Wien-bridge
D.	Crystal
Answer» E.

Discussion

29.	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» D. None of the above

Discussion

30.	In the above question, what is the power in sidebands?
A.	8 kW
B.	6 kW
C.	06 kW
D.	9 kW
Answer» D. 9 kW

Discussion

31.	Demodulation is done in ___________
A.	Receiving antenna
B.	Transmitter
C.	Radio receiver
D.	Transmitting antenna
Answer» D. Transmitting antenna

Discussion

32.	Modulation is done in ___________
A.	Transmitter
B.	Radio receiver
C.	Between transmitter and radio receiver
D.	None of the above
Answer» B. Radio receiver

Discussion

33.	If modulation is 100% then signal amplitude is ___________ carrier amplitude%!
A.	Equal to
B.	Greater than
C.	Less than
D.	None of the above
Answer» B. Greater than

Discussion

34.	The superhetrodyne principle provides selectivity at ___________ stage%!
A.	RF
B.	IF
C.	audio
D.	Before RF
Answer» C. audio

Discussion

35.	In amplitude modulation, the ___________ of carrier is varied according to the strength of the signal.%!
A.	Amplitude
B.	Frequency
C.	Phase
D.	None of the above
Answer» B. Frequency

Discussion

36.	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» E.

Discussion

37.	The signal voltage induced in the aerial of a radio receiver is of the order of ___________%!
A.	mV
B.	¬¨¬µV
C.	V
D.	None of the above
Answer» C. V

Discussion

38.	In radio transmission, the medium of transmission is ___________%!
A.	Space
B.	An antenna
C.	Cable
D.	None of the above
Answer» B. An antenna

Discussion

39.	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» C. 1500 kHz

Discussion

40.	*$_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» D. None of the above

Discussion

41.	%_Overmodulation (amplitude) occurs when signal amplitude is ___________ carrier amplitude_%
A.	Equal to
B.	Greater than
C.	Less than
D.	None of the above
Answer» C. Less than

Discussion

42.	%_Most of the amplification in a superhetrodyne receiver occurs at ___________ stage_%
A.	IF
B.	RF amplifier
C.	Audio amplifier
D.	Detector
Answer» B. RF amplifier

Discussion

43.	%_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» C. 5

Discussion

44.	%_As the modulation level is increased, the carrier power ____________%
A.	Is increased
B.	Remains the same
C.	Is decreased
D.	None of the above
Answer» C. Is decreased

Discussion

45.	%_If Amin = 40 and Amax = 60, what is the percentage of modulation?_%
A.	20%
B.	40%
C.	50%
D.	10%
Answer» B. 40%

Discussion

46.	%_In a radio receiver, we generally use ___________ oscillator as a local oscillator_%
A.	Crystal
B.	Wien-bridge
C.	Phase-shift
D.	Hartley
Answer» E.

Discussion

47.	%_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» B. IF

Discussion

48.	%_In the above question, what is the power in sidebands?_%
A.	8 kW
B.	6 kW
C.	06 kW
D.	9 kW
Answer» D. 9 kW

Discussion

49.	__If level of modulation is increased ___________ power is increased__
A.	Carrier
B.	Sideband
C.	Carrier as well as sideband
D.	None of the above
Answer» C. Carrier as well as sideband

Discussion

50.	__In TV transmission, sound signal is ___________ modulated__
A.	Amplitude
B.	Frequency
C.	Phase
D.	None of the above
Answer» C. Phase

Discussion

Explore topic-wise MCQs in Electrical Engineering.

The IF is 455 kHz. If the radio receiver is tuned to 855 kHz, the local oscillator frequency is ___________

In a TRF radio receiver, the RF and detection stages are tuned to ___________

The letters AVC stand for ___________

Overmodulation results in ___________

In radio transmission, the medium of transmission is ___________

In a radio receiver, we generally use ___________ oscillator as a local oscillator

In an AM wave useful power is carrier by ___________

When the modulating signal controls the frequency of the carrier, we get___________

The signal voltage induced in the aerial of a radio receiver is of the order of ___________

If Amin = 40 and Amax = 60, what is the percentage of modulation?

The function of ferrite antenna is to ___________

The diode detector in an AM radio receiver is usually found ___________

Modulation refers to a low-frequency signal controlling the ___________

As the modulation level is increased, the carrier power ___________

In an AM wave, the majority of the power is in ___________

The major advantage of FM over AM is ___________

In amplitude modulation, the ___________ of carrier is varied according to the strength of the signal.

A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor?

In amplitude modulation, bandwidth is ___________ the audio signal frequency

If a radio receiver amplifies all the signal frequencies equally well, it is said to have high ___________

The superhetrodyne principle provides selectivity at ___________ stage

Most of the amplification in a superhetrodyne receiver occurs at ___________ stage

In TV transmission, sound signal is ___________ modulated

In TV transmission, picture signal is ___________ modulated

If modulation is 100% then signal amplitude is ___________ carrier amplitude

Overmodulation (amplitude) occurs when signal amplitude is ___________ carrier amplitude

If level of modulation is increased ___________ power is increased

In a transmitter ___________ oscillator is used

Superhertodyne principle refers to

In the above question, what is the power in sidebands?

Demodulation is done in ___________

Modulation is done in ___________

If modulation is 100% then signal amplitude is ___________ carrier amplitude%!

The superhetrodyne principle provides selectivity at ___________ stage%!

In amplitude modulation, the ___________ of carrier is varied according to the strength of the signal.%!

Modulation refers to a low-frequency signal controlling the ___________%!

The signal voltage induced in the aerial of a radio receiver is of the order of ___________%!

In radio transmission, the medium of transmission is ___________%!

The IF is 455 kHz. If the radio receiver is tuned to 855 kHz, the local oscillator frequency is ___________%!

*$_Superhertodyne principle refers to?

%_Overmodulation (amplitude) occurs when signal amplitude is ___________ carrier amplitude_%

%_Most of the amplification in a superhetrodyne receiver occurs at ___________ stage_%

%_A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor?_%

%_As the modulation level is increased, the carrier power ____________%

%_If Amin = 40 and Amax = 60, what is the percentage of modulation?_%

%_In a radio receiver, we generally use ___________ oscillator as a local oscillator_%

%_In a TRF radio receiver, the RF and detection stages are tuned to ____________%

%_In the above question, what is the power in sidebands?_%

__If level of modulation is increased ___________ power is increased__

__In TV transmission, sound signal is ___________ modulated__

If level of modulation is increased _______ power is increased

In TV transmission, sound signal is _______ modulated