Electronics and Communication Engineering - Digital Electronics

16. 

Assertion (A): Demorgan's first theorem replaces a NOR gate by bubbled AND gate.

Reason (R): Double complement of a variable equals the variable.

A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is true, R is false
D. A is false, R is true

Answer: Option B

Explanation:

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17. 

A flip-flop circuit is

A. monostable
B. bistable
C. multistable
D. unstable

Answer: Option B

Explanation:

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18. 

Assertion (A): The use of 2's complement has simplified the computer hardware for arithmetic operations

Reason (R): 2's complement is obtained by adding 1 to 1's complement.

A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is true, R is false
D. A is false, R is true

Answer: Option B

Explanation:

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19. 

How many lines are there in address bus of 8085 μp?

A. 6
B. 8
C. 12
D. 16

Answer: Option D

Explanation:

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20. 

Consider the following statements Timer 555 can be used as

  1. monostable multivibrator
  2. bistable multivibrator
  3. astable multivibrator
Which of the above statements are correct?

A. 1 and 2
B. 1 and 3
C. 2 and 3
D. 1, 2, 3

Answer: Option B

Explanation:

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