# 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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