Elearn 4
Authored by Bình Thanh
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University
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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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