Electrical Online Test 7
Category –EE Online Test
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Attempt Free Electrical Online Test 7 Here. Read The Important Electrical MCQ From Below.
1) The two basic types of signals are analog and————
a. Modulation
b. amplitude
c. digital
d. sine wave
Ans. c. digital
2) The bandwidth of voice signal which has max. frequency 3KHz is
a. 3 KHz
b. 6 KHz
c. 9 KHz
d. None of above
Ans. b. 6 KHz
3) Which is called as angle modulation
a. AM
b. PM
c. FM
d. BOTH AM&PM
Ans. d. BOTH AM&PM
4) Bandwidth is independent of signal bandwidth in case of
a. AM
b. PM
c. BOTH
d. NONE
Ans. b. PM
Electrical Online Test 7
5) Which type of signal is represented by discrete values
a. noisy signal
b. nonlinear
c. Analog
d. digital
Ans. d. digital
6) The value of modulation index in AM is
a. always zero
b. >1
c. in between o and 1
d. negative
Ans. c. in between o and 1
7) Disadvantage of DSB and SSB are
a. Difficult to transmit
b. Difficult to receive
c. difficult to demodulate
d. none of the above
Ans. c. difficult to demodulate
8) In digital electronic circuits, information is first converted to a coded group of pulses
a. True
b. False
Ans. a. True
Electrical Online Test 7
9) 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
10) 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.
11) 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. a. Angle modulation
12) The decimal code system used ten levels of voltage
a. True
b. False
Ans. a. True
13) Which is most popular form of analog modulation
a. AM
b. PM
c. FM
d. NONE OF ABOVE
Ans. c. FM
Electrical Online Test 7
14) 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
15) 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
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) Bessel functions are used in
a. AM
b. FM
c. PM
d. PCM
Ans. b. FM
Electrical Online Test 7
18) 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. a. True
19) In AM distortion caused by over modulation also produces adjacent channel interference
a. True
b. False
Ans. a. True
20) In SSB which sideband can be used
a. LSB
b. USB
c. BOTH
d. NONE
Ans. a. LSB
21) Digitizing a signal converts it from digital to analog
a. True
b. False
Ans. b. False
Electrical Online Test 7
22) Two way SSB communication used in marine applications
a. TRUE
b. FALSE
c. both
d. none of the above
Ans. a. TRUE
23) 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
24) 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
25) Digital systems using the 10-state system are more accurate than those using the two-state system.
a. True
b. False
Ans. b. False
Electrical Online Test 7
