Communicatin System 1(TTA)
INSTRUCTIONS
1. NUMBER OF QUESTIONS 25
2. HAS A TIME LIMIT OF 15 MINUTES
3. HAS A PASS MARKS OF 30%
4. QUESTIONS PER PAGE 1
5. EACH QUESTIONS HAS 1 MARKS
6. NEGATIVE MARKING FOR EACH QUESTIONS 0.25
7. WILL ALLOW TO YOU GO BACK ,SKIP AND CHANGE YOUR ANSWERS
8. WILL ALLOW TO YOU PRINT OUT YOUR RESULT AND CERTIFICATE
9. WILL ALLOW TO YOU PRINT OUT YOURS RESPONSE SHEET WITH CORRECT ANSWER KEY AND EXPLANATION
10. WE WILL PROVIDE YOURS RESULT,CERTIFICATE AND YOUR RESPONSE SHEET TO YOURS EMAIL ID AT END OF ONLINE TEST
- 1.
The value of madulation index in AM is
- A.
always zero
- B.
>1
- C.
in between o and 1
- D.
negative
Correct Answer
C. in between o and 1 -
- 2.
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
Correct Answer
A. TRUE -
- 3.
In AM if the amplitude of the modulating signal is greater than the amplitude of the carrier,distortion will occur
- A.
True
- B.
False
Correct Answer
A. True -
- 4.
In AM distortion caused by over modulation also produces adjacent channel interference
- A.
True
- B.
False
Correct Answer
A. True -
- 5.
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
Correct Answer
B. Twice -
- 6.
The bandwidth of voice signal which has max. frequecy 3KHz is
- A.
3 KHz
- B.
6 KHz
- C.
9 KHz
- D.
None of above
Correct Answer
B. 6 KHz -
- 7.
Disadvantage of DSB and SSB are
- A.
Difficult to transmit
- B.
Difficult to receive
- C.
difficult to demodulate
- D.
none of the above
Correct Answer
C. difficult to demodulate -
- 8.
In SSB which sideband can be used
- A.
LSB
- B.
USB
- C.
BOTH
- D.
NONE
Correct Answer
A. LSB -
- 9.
Two way SSB communication used in marine applications
- A.
TRUE
- B.
FALSE
- C.
both
- D.
none of the above
Correct Answer
A. TRUE -
- 10.
_____is used to suppress the lower sideband of TV signal
- A.
SSB
- B.
DSB
- C.
VSB
- D.
NONE OF ABOVE
Correct Answer
C. VSB -
- 11.
Which is called as angle modulation
- A.
AM
- B.
PM
- C.
FM
- D.
BOTH AM&PM
Correct Answer
D. BOTH AM&PM -
- 12.
Which is most popular form of analog modulation
- A.
AM
- B.
PM
- C.
FM
- D.
NONE OF ABOVE
Correct Answer
C. FM -
- 13.
Bessel functions are used in
- A.
AM
- B.
FM
- C.
PM
- D.
PCM
Correct Answer
B. FM -
- 14.
Bandwidth is independent of signal bandwidth in case of
- A.
AM
- B.
PM
- C.
BOTH
- D.
NONE
Correct Answer
B. PM -
- 15.
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
Correct Answer
A. Angle modulation -
- 16.
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. It has a continuous set of values over a given range.
Correct Answer
D. It has a continuous set of values over a given range. It has a continuous set of values over a given range. -
- 17.
Which type of signal is represented by discrete values
- A.
noisy signal
- B.
nonlinear
- C.
Analog
- D.
digital
Correct Answer
D. digital -
- 18.
The two basic types of signals are analog and------------
- A.
Modulation
- B.
amplitude
- C.
digital
- D.
sine wave
Correct Answer
C. digital -
- 19.
Digitizing a signal converts it from digital to analog
- A.
True
- B.
False
Correct Answer
B. False -
- 20.
. In digital electronic circuits, information is first converted to a coded group of pulses
- A.
True
- B.
False
Correct Answer
A. True -
- 21.
Digital systems using the 10-state system are more accurate than those using the two-state system.
- A.
True
- B.
False
Correct Answer
B. False -
- 22.
The decimal code system used ten levels of voltage
- A.
True
- B.
False
Correct Answer
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
Correct Answer
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
Correct Answer
B. digital to analog -
- 25.
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
Correct Answer
D. Amplitude and phase -
Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Aug 01, 2016Quiz Edited by
ProProfs Editorial Team -
Jul 31, 2016Quiz Created by
Harish.hot04
Back to top