MCQOPTIONS

Explore topic-wise MCQs in Analog Communications.

This section includes 19 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.	Aliasing refers to ________
A.	Sampling of signals less than at Nyquist rate
B.	Sampling of signals at Nyquist rate
C.	Sampling of signals greater than at Nyquist rate
D.	Unsampled the original signal
Answer» B. Sampling of signals at Nyquist rate

2.	Signal to quantization noise ratio in PCM system depends on _________
A.	sampling rate
B.	signal bandwidth
C.	number of quantization levels
D.	bit rate
Answer» D. bit rate

3.	What is the carrier power of an un-modulated carrier signal when it is transmitted through an antenna having an impedance of 50? and it produces a current of 5.4A?
A.	1458W
B.	1468W
C.	1478W
D.	1488W
Answer» B. 1468W

4.	Find the total power, if the carrier of an AM transmitter is 800W and it is modulated to 50%?
A.	100W
B.	800W
C.	500W
D.	900W
Answer» E.

5.	Audio frequency range lies between _________
A.	2 MHz to 20 MHz
B.	20 Hz to 20 KHz
C.	20 KHz to 200 KHz
D.	20 MHz to 200 MHz
Answer» C. 20 KHz to 200 KHz

6.	Communication consists of electrical means of sending information only.
A.	True
B.	False
Answer» C.

7.	Which statement is true about emitter modulator amplifier for amplitude modulation?
A.	operates in class A mode
B.	operates in class C mode
C.	operates in class B mode
D.	operates in class D mode
Answer» B. operates in class C mode

8.	In communication system, redundancy ________
A.	Helps to detect error
B.	Helps to correct error
C.	Reduces efficiency of communication
D.	Helps to detect and correct error and also reduces efficiency
Answer» E.

9.	Which of the following statement is not true about auto-correlation function?
A.	it is non-unique description of goals
B.	it is measure of both time variation and statistical dependence
C.	it is an average function
D.	it is defined only for periodic signals
Answer» E.

10.	Auto-correlation function is non-unique description of signals.
A.	True
B.	False
Answer» B. False

11.	What is the auto-correlation function of a signal (t) at t0=0?
A.	It is equal to average voltage of the signal
B.	It is equal to average power of the signal
C.	It is equal to zero
D.	It is equal to infinite
Answer» C. It is equal to zero

12.	Bandwidth of RF amplifier for a color TV receiver is ________
A.	equal to channel width
B.	more than channel width
C.	less than channel width
D.	twice of channel width
Answer» C. less than channel width

13.	In automatic gain control of the AM receiver ________
A.	gain of the receiver is adjusted
B.	gain adjustment depends upon the strength of received signal
C.	is an open-loop system
D.	gain is received only by stronger signals
Answer» B. gain adjustment depends upon the strength of received signal

14.	Which of the following is an example of continuous wave analog modulation?
A.	PCM
B.	DPCM
C.	AM
D.	ADM
Answer» D. ADM

15.	Modulation is used to separate differing transmission.
A.	True
B.	False
Answer» B. False

16.	The output stage of television transmitters is most likely to be a __________
A.	Grid modulated class C amplifier
B.	Grid modulated class A amplifier
C.	Plate modulated class C amplifier
D.	Plate modulated class A amplifier
Answer» B. Grid modulated class A amplifier

17.	A function f(x) is odd, when?
A.	f(x) = -f(x)
B.	f(x) = f(-x)
C.	f(x) = -f(x)f(-x)
D.	f(x) = f(x)f(-x)
Answer» B. f(x) = f(-x)

18.	The amount of frequency deviation in FM signal depends on ________
A.	Modulating frequency
B.	Modulation Index
C.	Amplitude of the modulating signal
D.	Carrier frequency
Answer» D. Carrier frequency

19.	What is the function of frequency mixer in super heterodyne receiver?
A.	Multiplication of incoming signal and the locally generated carrier
B.	Addition of incoming signal and the locally generated carrier
C.	Amplification
D.	Filtering
Answer» B. Addition of incoming signal and the locally generated carrier