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Elearn 4

Authored by Bình Thanh

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University

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Elearn 4
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10 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Câu 1 : The attenuation of fiber-optic cable does not depend on :

Electromagnetic interference

Category

Bend radius and number of bends

Distance

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Câu 2 : I. The errors of received data must be corrected II. The data with errors must be retransmitted III. The data with errors must be discarded

None is correct

III.

I. and II.

II.

I.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Câu 3: What is correct about the benefits of fiber-optic communications?

High attenuation, narrow bandwidth, slight, non-electromagnetic interference, high security

Low attenuation, wide bandwidth, slight, non-electromagnetic interference, high security,cheap

Low attenuation, wide bandwidth,slight, non-electromagnetic interference, high security

Low attenuation, narrow bandwidth, slight, non-electromagnetic interference, high security

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Câu 4: Which of the following aspects does not make the received signal distorted?

Limited signal bandwidth

Distance

Limited channel bandwidth

Noise

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Câu 5: Synchronous transmission is done between...

2 PCs via network interface card

2 PCs via network interface card

Mouse and PC

Keyboard and PC

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Câu 6 : The minimum Hamming distance of an error control coding scheme is dₘᵢₙ = 5, this scheme is able to...

Detect up to 4 error bits or correct up to 1 error bits

Detect up to 4 error bits or correct up to 2 error bits

Detect up to 5 error bits or correct up to 1 error bits

Detect up to 5 error bits or correct up to 2 error bits

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Câu 7 : A signal is sampled at 8000 samples/s and the amplitude of the signal is quantized by 256 levels. The data rate is...?

64Kbps

16Kbps

64Kbps

128Kbps

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