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Q.

How many carrier frequencies are used in QPSK?

A

2

B

1

D

none of the above

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MCQ

1.

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

Discussion

MCQ

2.

In asynchronous transmission, the gap time between bytes is _______

A

fixed

B

variable

C

a function of the data rate

D

zero

Discussion

MCQ

3.

Unipolar, bipolar, and polar encoding are types of _______ encoding.

A

line

B

block

C

NRZ

D

Manchester

Discussion

MCQ

4.

The Nyquist theorem specifies the minimum sampling rate to be_______.

A

equal to the lowest frequency of a signal

B

equal to the highest frequency of a signal

C

twice the bandwidth of a signal

D

twice the highest frequency of a signal

Discussion

MCQ

5.

___________ conversion involves three techniques: line coding, block coding, and scrambling.

A

Analog-to-digital

B

Digital-to-analog

C

Analog-to-analog

D

Digital-to-digital

Discussion

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