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MCQ

Q.

In asynchronous transmission, the gap time between bytes is _______

A

fixed

B

variable

C

a function of the data rate

D

zero

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MCQ

1.

Which of the following encoding methods does not provide for synchronization?

A

NRZ-L

B

RZ

C

NRZ-I

D

Manchester

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2.

How many carrier frequencies are used in BFSK?

A

2

B

1

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3.

In _____ transmission, the frequency of the carrier signal is modulated to follow the changing voltage level (amplitude) of the modulating signal. The peak amplitude and phase of the carrier signal remain constant, but as the amplitude of the information signal changes, the frequency of the carrier changes correspondingly.

A

AM

B

PM

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FM

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none of the above

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4.

________ uses two carriers, one in-phase and the other quadrature

A

ASK

B

PSK

C

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D

QAM

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5.

In a _____ scheme, all the signal levels are on one side of the time axis, either above or below.

A

polar

B

bipolar

C

unipolar

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all of the above

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