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Q.

Modem is used in data transmission. When was it invented and in which country?

A

1963, USA

B

1965, Germany

C

1950, USA

D

1950, Japan

E

None of the above

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MCQ

1.

Which of the following types of channels moves data relatively slowly?

A

wideband channel

B

voiceband channel

C

narrowband channel

D

broadband channel

E

None of the above

Discussion

MCQ

2.

The encoding method specified in the EIA-232 standard is _____.

A

NRZ-I

B

NRZ-L

C

Manchester

D

Differential Manchester

E

None of the above

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3.

Eight stations are competing for the use of the shared channel using the modified Adaptive free walk protocol by Gallager. If the stations 7 and 8 are suddenly become ready at once, how many bit slots are needed to resolve the contention?

A

1 slots

B

5 slots

C

10 slots

D

14 slots

E

None of the above

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4.

The dialogue techniques for terminal use do not include

A

questions and answers

B

open-ended questions

C

form fillings

D

menu display

E

None of the above

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5.

Which of the following is used for modulation and demodulation?

A

modem

B

protocols

C

gateway

D

multiplexer

E

None of the above

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