Electronics and Communication Engineering - Digital Electronics

16. 

A 14 pin AND gate IC has __________ AND gates.

A. 8
B. 6
C. 4
D. 2

Answer: Option C

Explanation:

Each AND gates requires 3 pins, 2 inputs and one output, 1 supply pin and 1 ground pin. Hence 4 AND gates.


17. 

In 8085 microprocessor, how many lines are there in data bus?

A. 6
B. 8
C. 2
D. 16

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

18. 

The basic shift register operations are

A. serial in - serial out
B. serial in - parallel out
C. parallel in - serial out
D. all of the above

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

19. 

The hexadecimal number 'A0' has the decimal value

A. 80
B. 256
C. 100
D. 160

Answer: Option D

Explanation:

'Ao' = 10 x 161 + 0 = 160.


20. 

A 4 bit ripple counter is in 0000 state. The clock pulses are applied and then removed. The counter reads 0011. The number of clock pulses which have occurred are

A. 3
B. 3 or 19
C. 3 or 19 or 35
D. none of the above

Answer: Option C

Explanation:

After 16 pulses the counter resets. 0011 is 3. Hence clock pulses can be 3 or 3 + 16 or 3 + 16 + 16.