VLSI Built-in Self Test MCQ Quiz – Objective Question with Answer for Built-in Self Test for VLSI

11. Self-checking technique consists of

A. supplying coded input data
B. receiving coded output data
C. supplying all possible input sequence
D. all of the mentioned

Answer: A

The self-checking technique consists of supplying coded input data to the logic block under test and comparing the output.

 

12. The type of errors in the self-checking techniques is

A. simple error
B. unidirectional error
C. multiple errors
D. all of the mentioned

Answer: D

The type of errors in self-checking techniques are simple errors, unidirectional errors, and multiple errors.

 

13. The parity check detection is done using

A. OR gate
B. AND gate
C. XOR gate
D. NOR gate

Answer: C

The parity check detects simple errors using XOR gates and for each type of error, the approximate coding technique is used.

 

14. Which errors are detected using duplication codes?

A. single errors
B. unidirectional errors
C. bidirectional errors
D. multiple errors

Answer: D

Multiple errors are detected using duplication codes which consist of duplicating the information.

 

15. Linear feedback shift register occupies more area.

A. true
B. false

Answer: B

The linear feedback shift register method is more area efficient than counters and other methods and requires less combinational logic.

 

16. In external feedback LFSR, shift registers and feedback paths are combined using

A. OR gates
B. AND gates
C. EX-OR gates
D. NAND gates

Answer: C

In the external feedback linear feedback shift register method, the shift registers, and the feedback path are linearly combined via EX-OR gates.

 

17. Which uses the highest operating frequency?

A. internal feedback LFSR
B. external feedback LFSR
C. both internal and external LFSR
D. counters

Answer: A

Internal feedback LFSR provides implementation with the highest operating frequency for use in a high-performance applications.

 

18. Which method has more uniformity?

A. internal feedback LFSR
B. external feedback LFSR
C. all of the mentioned
D. none of the mentioned

Answer: B

External feedback LFSR has more uniformity of the shift register and this is its main advantage.

 

19. The initial state in LFSR must be initialized to zero.

A. true
B. false

Answer: B

The initial state in LFSR must be initialized to any state other than zero so that it goes through all possible states except all 0’s before repeating the sequence.

 

20. For n-bit LFSR, the longest possible sequence is given by

A. 2n
B. 2n + 1
C. 2n – 1
D. 1/2n

Answer: C

For n-bit LFSR, the longest possible sequence of patterns is given by 2n-1.

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