Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 42 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

1.

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
2.

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
3.

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
4.

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
5.

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
6.

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» C. Only the difference frequency can be modulated
Discussion
7.

In TV transmission, sound signal is ______________modulated?
A. Amplitude
B. Frequency
C. Phase
D. None of the above
Answer» C. Phase
Discussion
8.

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
9.

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
10.

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
11.

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
12.

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» E.
Discussion
13.

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
14.

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
15.

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
16.

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
17.

If Amin = 40 and Amax = 60, what is the percentage of modulation?
A. 20 %
B. 40 %
C. 50 %
D. 10 %
Answer» B. 40 %
Discussion
18.

The superhetrodyne principle provides selectivity at ______________stage?
A. RF
B. IF
C. audio
D. Before RF
Answer» C. audio
Discussion
19.

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
20.

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
21.

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
22.

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
23.

If modulation is 100% then signal amplitude is ____________arrier amplitude?
A. Equal to
B. Greater than
C. Less than
D. None of the above
Answer» B. Greater than
Discussion
24.

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
25.

In a transmitter ____________oscillator is used?
A. Hartley
B. RC phase-shift
C. Wien-bridge
D. Crystal
Answer» E.
Discussion
26.

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
27.

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
28.

At 100% modulation, the power in each sideband is _____________ of that of carrier?
A. 50%
B. 40%
C. 60%
D. 25%
Answer» E.
Discussion
29.

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
30.

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
31.

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» B. 5 kW
Discussion
32.

A high Q tuned circuit will permit an amplifier to have high __________________?
A. Fidelity
B. Frequency range
C. Sensitivity
D. Selectivity
Answer» E.
Discussion
33.

Man made noise are______________ variations?
A. Amplitude
B. Frequency
C. Phase
D. Both phase and frequency
Answer» B. Frequency
Discussion
34.

Demodulation is done in ________________?
A. Receiving antenna
B. Transmitter
C. Radio receiver
D. Transmitting antenna
Answer» D. Transmitting antenna
Discussion
35.

In a radio receiver, noise is generally developed at _______________?
A. IF stage
B. Receiving antenna
C. Audio stage
D. RF stage
Answer» E.
Discussion
36.

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
37.

In pakistan, ______________ modulation is used for radio transmission?
A. Frequency
B. Amplitude
C. Phase
D. None of the above
Answer» C. Phase
Discussion
38.

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
39.

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
40.

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
41.

Over modulation 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
42.

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