Electronics and Communication Engineering - Digital Electronics

21. 

TTL logic is preferred to DRL logic because

A. greater fan-out is possible
B. greater logic levels are possible
C. greater fan-in is possible
D. less power consumption is achieve

Answer: Option A

Explanation:

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

22. 

Assertion (A): Schottky transistors are preferred over normal transistors in digital circuits

Reason (R): A Schottky transistor when used as a switch, between cutoff and active region.

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 A

Explanation:

Schottky transistors are fast switching because saturation is avoided.


23. 

The inputs A and B of the given figure are applied to a two input NOR gate. The output waveform is

A.
B.
C.
D.

Answer: Option B

Explanation:

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

24. 

In the circuit of the given figure, V0 =

A. 5 V
B. 3.1 V
C. 2.5 V
D. 0

Answer: Option A

Explanation:

Transistor is off and circuit current is zero.


25. 

A parallel in-parallel out shift register can be used to introduce delay in digital circuits.

A. True
B. False

Answer: Option B

Explanation:

No time delay in this shift register since all bits are loaded and read simultaneously.