Communication System 2(TTA)
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INSTRUCTIONS1. NUMBER OF QUESTIONS 252. HAS A TIME LIMIT OF 15 MINUTES3. HAS A PASS MARKS OF 30%4. QUESTIONS PER PAGE 15. EACH QUESTIONS HAS 1 MARKS6. NEGATIVE MARKING FOR EACH QUESTIONS IS 0. 257. WILL ALLOW TO YOU GO BACK ,SKIP AND CHANGE YOUR ANSWERS8. WILL ALLOW TO YOU PRINT OUT YOUR RESULT AND CERTIFICATE9. WILL ALLOW TO YOU PRINT OUT YOURS RESPONSE SHEET WITH CORRECT ANSWER KEY AND EXPLANATION10. WE WILL PROVIDE YOURS RESULT,CERTIFICATE AND YOUR RESPONSE SHEET TO YOURS EMAIL ID AT END OF Online Test.
- 1.If the baud rate is 400 for a QPSK signal, the bit rate is ________ bps
- A.
100
- B.
400
- C.
800
- D.
1600
- 2.If the bit rate for an ASK signal is 1200 bps, the baud rate is
- A.
300
- B.
400
- C.
600
- D.
1200
- 3.If the bit rate for an FSK signal is 1200 bps, the baud rate is
- A.
300
- B.
400
- C.
600
- D.
1200
- 4.FCC stands for
- A.
Federal communication commission
- B.
frequency communication commission
- C.
Fourier communication commission
- D.
none of the above
- 5.Given an AM radio signal with a bandwidth of 10 KHz and the highest-frequency component at 705 KHz, what is the frequency of the carrier signal?
- A.
700 KHz
- B.
705 KHz
- C.
710 KHz
- D.
Cannot be determined from given info
- 6._______ conversion is the process of changing one of the characteristics of an analog signal based on the information in the digital data
- A.
digital to analog
- B.
Analog to analog
- C.
Analog to digital
- D.
Digital to digital
- 7.Which of the following is not a digital-to-analog conversion
- A.
ASK
- B.
PSK
- C.
FSK
- D.
AM
- 8.In ________, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remain constant
- A.
ASK
- B.
PSK
- C.
FSK
- D.
QAM
- 9.In _________, the frequency of the carrier signal is varied to represent data. Both peak amplitude and phase remain constant
- A.
ASK
- B.
PSK
- C.
FSK
- D.
QAM
- 10.In ________, the phase of the carrier is varied to represent two or more different signal elements. Both peak amplitude and frequency remain constant
- A.
ASK
- B.
PSK
- C.
FSK
- D.
QAM
- 11.A constellation diagram shows us the __________ of a signal element, particularly when we are using two carriers (one in-phase and one quadrature)
- A.
amplitude and phase
- B.
Amplitude and frequency
- C.
frequency and phase
- D.
None of the above
- 12.Quadrature amplitude modulation (QAM) is a combination of ____
- A.
ASK and FSK
- B.
ASK and PSK
- C.
PSK and FSK
- D.
none of the above
- 13.________ uses two carriers, one in-phase and the other quadrature
- A.
A) ASK
- B.
PSK
- C.
FSK
- D.
QAM
- 14._________ conversion is the representation of analog information by an analog signal.
- A.
Digital to analog
- B.
analog to analog
- C.
analog to digital
- D.
Digital to digital
- 15.Analog-to-analog conversion is needed if the available bandwidth is _______.
- A.
low pass
- B.
Band pass
- C.
Both
- D.
None
- 16.Which of the following is not an analog-to-analog conversion?
- A.
AM
- B.
FM
- C.
PM
- D.
QAM
- 17.In _____ transmission, the carrier signal is modulated so that its amplitude varies with the changing amplitudes of the modulating signal
- A.
AM
- B.
PM
- C.
FM
- D.
none of the above
- 18.In _____ transmission, the phase of the carrier signal is modulated to follow the changing voltage level (amplitude) of the modulating signal
- A.
AM
- B.
PM
- C.
FM
- D.
NONE OF ABOVE
- 19.In _______, the peak amplitude of one signal level is 0; the other is the same as the amplitude of the carrier frequency
- A.
PSK
- B.
OOK
- C.
FSK
- D.
NONE
- 20.How many carrier frequencies are used in BASK
- A.
2
- B.
1
- C.
0
- D.
NONE
- 21.How many carrier frequencies are used in BFSK
- A.
2
- B.
1
- C.
0
- D.
NONE
- 22.How many carrier frequencies are used in BPSK
- A.
2
- B.
1
- C.
0
- D.
None
- 23.How many carrier frequencies are used in QPSK
- A.
2
- B.
1
- C.
0
- D.
None
- 24.The constellation diagram of BASK has ______ dots.
- A.
2
- B.
1
- C.
0
- D.
None
- 25.The constellation diagram of BPSK has ______ dots
- A.
2
- B.
1
- C.
0
- D.
None
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