Electrical Online Test 4

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Attempt Free Electrical Online Test 4 Here. Read The Important Electrical MCQ From Below.

1) . In digital electronic circuits, information is first converted to a coded group of pulses

A. True
B. False

Ans-A. True

2) Digital systems using the 10-state system are more accurate than those using the two-state system.

A. True
B. False

Ans-B. False

3) The decimal code system used ten levels of voltage

A. True
B. False

Ans-A. True

4) AM and FM are examples of ________ conversion.

A. digital to digital
B. digital to analog
C. analog to analog
D. Analog to digital

Ans-C. analog to analog

Electrical Online Test 4

5) ASK, PSK, FSK, and QAM are examples of ________ conversion

A. Digital to digital
B. digital to analog
C. analog to analog
D. analog to digital

Ans-B. digital to analog

6) In QAM, both ________ of a carrier frequency are varied

A. Frequency and amplitude
B. Phase and frequency
C. none of the above
D. Amplitude and phase

Ans-D. Amplitude and phase

7) The value of madulation index in AM is

A. always zero
B. >1
C. in between o and 1
D. negative

Ans-B. >1

8) In AM the peak value of the modulating signal should be less than the peak value of the carrier.

A. TRUE
B. FALSE
C. Not always
D. None of the above

Ans-A. TRUE

9) In AM if the amplitude of the modulating signal is greater than the amplitude of the carrier, distortion will occur

A. True
B. False

Ans-B. False

Electrical Online Test 4

10) In AM distortion caused by over modulation also produces adjacent channel interference

A. True
B. False

Ans-A. True

11) The bandwidth of an AM signal is —– the highest frequency in the modulating signal

A. Equals
B. Twice
C. thrice
D. none of the above

Ans-B. Twice

12) The bandwidth of voice signal which has max. frequecy 3KHz is

A. 3 KHz
B. 6 KHz
C. 9 KHz
D. None of above

Ans-D. None of above

13) Disadvantage of DSB and SSB are

A. Difficult to transmit
B. Difficult to receive
C. difficult to demodulate
D. none of the above

Ans-B. Difficult to receive

Electrical Online Test 4

14) In SSB which sideband can be used

A. LSB
B. USB
C. BOTH
D. NONE

Ans-B. USB

15) Two way SSB communication used in marine applications

A. TRUE
B. FALSE
C. both
D. none of the above

Ans-A. TRUE

16) _____is used to suppress the lower sideband of TV signal

A. SSB
B. DSB
C. VSB
D. NONE OF ABOVE

Ans-C. VSB

17) Which is called as angle modulation

A. AM
B. PM
C. FM
D. BOTH AM&PM

Ans-C. FM

18) Which is most popular form of analog modulation

A. AM
B. PM
C. FM
D. NONE OF ABOVE

Ans-A. AM

Electrical Online Test 4

19) Bessel functions are used in

A. AM
B. FM
C. PM
D. PCM

Ans-B. FM

20) Bandwidth is independent of signal bandwidth in case of

A. AM
B. PM
C. BOTH
D. NONE

Ans-D. NONE

21) In —– frequency or phase of carrier is varied in proportion with the amplitude of modulating signal.

A. Angle modulation
B. Amplitude modulation
C. BOTH
D. NONE OF ABOVE

Ans-D. NONE OF ABOVE

Electrical Online Test 4

22) Which of the following characterizes an analog quantity

A. Discrete levels represent changes in a quantity
B. Its values follow a logarithmic response curve
C. It can be described with a finite number of steps
D. It has a continuous set of values over a given range.

Ans-D. It has a continuous set of values over a given range.

23) Which type of signal is represented by discrete values

A. noisy signal
B. nonlinear
C. Analog
D. digital

Ans-D. digital

24) The two basic types of signals are analog and————

A. Modulation
B. amplitude
C. digital
D. sine wave

Ans-C. digital

25) Digitizing a signal converts it from digital to analog

A. True
B. False

Ans-A. True

Electrical Online Test 4