Explore topic-wise MCQs in Analog Communications.

This section includes 28 Mcqs, each offering curated multiple-choice questions to sharpen your Analog Communications knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of the steps is not included in the process of reception?

A. encoding
B. decoding
C. demodulating
D. filtering
Answer» B. decoding
Discussion
2.

Which of the following is the most generally used term for comparing amplifier noise characteristics?

A. signal to noise ratio
B. equivalent noise
C. noise factor
D. figure of merit
Answer» D. figure of merit
Discussion
3.

The typical squelch circuit cuts off __________

A. An audio amplifier when the carrier is absent
B. RF interference when the signal is weak
C. An IF amplifier when Automatic Gain Control is maximum
D. An IF amplifier when Automatic Gain Control is minimum
Answer» B. RF interference when the signal is weak
Discussion
4.

What do you understand by high level AM?

A. Output power is low
B. Modulation is done at high power of carrier and modulating signal
C. No need to boost the carrier and modulating signal
D. Modulation is done at low power of carrier and modulating signal
Answer» C. No need to boost the carrier and modulating signal
Discussion
5.

The number of frames per second in the United States TV system is _________

A. 262.5
B. 525
C. 45
D. 30
Answer» E.
Discussion
6.

Why interlacing is used in television?

A. to reduce noise in video signals
B. to ensure that all the lines on screen are scanned
C. to reduce the disturbances
D. to avoid flicker
Answer» E.
Discussion
7.

The IF bandwidth of a radar receiver is inversely proportional to the __________

A. pulse repetition frequency
B. pulse width
C. pulse amplitude
D. pulse code
Answer» C. pulse amplitude
Discussion
8.

The signals sent by the TV transmitters to ensure correct scanning in the receiver are called luminance.

A. True
B. False
Answer» C.
Discussion
9.

As distance increases ________

A. Packet size also increases
B. Packet size decreases
C. Packet size becomes twice of its previous value
D. Packet size becomes half
Answer» B. Packet size decreases
Discussion
10.

What is the auto correction function of white noise?

A. Impulse Function
B. Step Function
C. Ramp Function
D. Parabolic Function
Answer» B. Step Function
Discussion
11.

The noise performance of a square law demodulator of AM signal is ___________

A. Identical with that of a synchronous detector
B. Better than that of an envelope detector
C. Better than that of a synchronous detector
D. Poorer than that of an envelope detector
Answer» D. Poorer than that of an envelope detector
Discussion
12.

After a target has been acquired, the best scanning system for tracking is _________

A. circular
B. spiral
C. conical
D. helical
Answer» D. helical
Discussion
13.

If the target cross section is changing, the best system for accurate tracking is __________

A. sequential switching
B. lobe switching
C. conical scanning
D. monopulse radar
Answer» E.
Discussion
14.

What do you understand by low level AM?

A. Output power is low
B. Modulation is done at high power of carrier and modulating signal
C. Collector Modulation Method is low level AM
D. Output power is high
Answer» B. Modulation is done at high power of carrier and modulating signal
Discussion
15.

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
Answer» C. Hartley Oscillator
Discussion
16.

The household radio receiver uses __________ detector.

A. Synchronous
B. Coherent
C. Radio
D. Envelope
Answer» E.
Discussion
17.

An input resistance of 20 K? causes a noise voltage of 10µV. Suppose two input resistance each of 20 K? are connected in parallel, then find the total noise voltage?

A. 8µV
B. 10µV
C. 20µV
D. 13µV
Answer» B. 10µV
Discussion
18.

Three point tracking is achieved by __________

A. Double conversion
B. Variable selectivity
C. Variable Sensitivity
D. Padder capacitor
Answer» E.
Discussion
19.

In frequency modulation, noise gets decreased if we decrease deviation.

A. True
B. False
Answer» C.
Discussion
20.

In systems, pre-emphasis is used to amplify ________

A. high frequency
B. low frequency
C. phase
D. amplitude
Answer» B. low frequency
Discussion
21.

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
Answer» D. 0.6
Discussion
22.

________ modulator is an indirect way of generating FM.

A. Varactor FET
B. Reactance FET
C. Armstrong
D. Reactance bipolar transistor
Answer» D. Reactance bipolar transistor
Discussion
23.

High IF in superheterodyne receiver, ____________

A. improves fidelity
B. improves selectivity
C. improves sensitivity
D. increases tracking problems
Answer» E.
Discussion
24.

Which device is most commonly used for detection in radio receiver?

A. Triode
B. Capacitor
C. Diode
D. Transistor
Answer» D. Transistor
Discussion
25.

If selectivity is poor then the receiver has poor _________

A. sensitivity
B. diverse reception
C. blocking
D. fidelity
Answer» D. fidelity
Discussion
26.

In FM the carrier deviation is determined by ________

A. Frequency
B. Modulation
C. Amplitude
D. Phase
Answer» C. Amplitude
Discussion
27.

Which system is free from noise?

A. FM
B. AM
C. PCM
D. PM
Answer» B. AM
Discussion
28.

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
Answer» C. 4.33 x 10-2
Discussion