Electronics and Communication Engineering - Digital Electronics

21. 

Four MSI TTL 4-bit ripple counters are cascaded to form a 16-bit binary counter. Its propagation delay is about __________ nanoseconds.

A. 70
B. 140
C. 210
D. 280

Answer: Option D

Explanation:

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

22. 

The Boolean function A + BC is reduced form of

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

Answer: Option C

Explanation:

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

23. 

The accuracy of A/D conversion is generally

A.
B. ± LSB
C.
D. none of the above

Answer: Option A

Explanation:

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

24. 

To convert JK flip flop to D flip flop

A. connect D to both J and K
B. connect D to J directly and D to K through inverter
C. connect D to K directly and D to J through inverter
D. connect D to K and leave J open

Answer: Option B

Explanation:

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

25. 

Read cycle is always followed by (during instructions execution)

A. read cycle
B. write cycle
C. delete signal
D. none of these

Answer: Option B

Explanation:

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