Digital Communications

Error Detection and Correction 1

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Which can detect two bit errors?
Parity check
Cyclic redundancy check
Parity & Cyclic redundancy check
None of the mentioned
Explanation:
CRC is more powerful and it can detect various kind of errors like 2 bit errors.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
CRC uses
Multiplication
Binary division
Multiplication & Binary division
None of the mentioned
Explanation:
CRC uses more math like multiplication and binary division.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Which has comparatively high frequency component?
Sine wave
Cosine wave
Square wave
None of the mentioned
Explanation:
Square wave has comparatively high frequency component in them.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
How error detection and correction is done?
By passing it through equalizer
By passing it through filter
By amplifying it
By adding redundancy bits
Explanation:
Error can be detected and corrected by adding additional information that is by adding redundancy bits.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Which requires bit transitions?
Asynchronous
Synchronous
Asynchronous & Synchronous
None of the mentioned
Explanation:
Synchronous transmission needs bit transition.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
In layering, n layers provide service to
n layer
n-1 layer
n+1 layer
none of the mentioned
Explanation:
In layering n layer provides service to n+1 layer and use the service provided by n-1 layer.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Which can be used as an intermediate device in between transmitter entity and receiver entity?
IP router
Microwave router
Telephone switch
All of the mentioned
Explanation:
IP router, microwave router and telephone switch can be used as an intermediate device between communication of two entities.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Which is more efficient?
Parity check
Cyclic redundancy check
Parity & Cyclic redundancy check
None of the mentioned
Explanation:
Cyclic redundancy check is more efficient than parity check.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Which has continuous transmission?
Asynchronous
Synchronous
Asynchronous & Synchronous
None of the mentioned
Explanation:
Synchronous has continuous transmission where as asynchronous have sporadic transmission.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
In synchronous transmission, receiver must stay synchronous for
4 bits
8 bits
9 bits
16 bits
Explanation:
In synchronous transmission, receiver must stay synchronous for 9 bits.