Electronics and Communication Engineering - Digital Electronics

16. 

Boolean expression for the output of XNOR (Equivalent) logic gate with inputs A and B is

A. AB + AB
B. AB + AB
C. (A + B). (A + B)
D. (A + B). (A + B)

Answer: Option C

Explanation:

(A + B) (A + B) = A ⊕ B.


17. 

An SR flip flop can be built using NOR gates or NAND gates.

A. True
B. False

Answer: Option A

Explanation:


18. 

In the given figure RC = RL = 1 kΩ, then V0 =

A. 5 V
B. 2.5 V
C. 1 V
D. 0 V

Answer: Option B

Explanation:

Transistor is off. .


19. 

A 14 pin NOT gate 1C has __________ NOT gates.

A. 8
B. 6
C. 5
D. 4

Answer: Option B

Explanation:

6 Input pins, 6 output pins, 1 supply pin and 1 ground pin. Hence 6 NOT gates.


20. 

F's complement of (2BFD)hex is

A. E 304
B. D 403
C. D 402
D. C 403

Answer: Option C

Explanation: