# Electronics and Communication Engineering - Digital Electronics

41.

The total number of input words for 4 input OR gate is

 A. 20 B. 16 C. 12 D. 8

Explanation:

24 = 16.

42.

In digital circuits Schottky transistors are preferred over normal transistors because of their

 A. lower propagation delay B. lower power dissipation C. higher propagation delay D. higher power dissipation

Explanation:

Schottky transistors have low switching time and hence low propagation delay.

43.

A flip flop is a

 A. combinational circuit B. memory element C. arithmetic element D. memory or arithmetic element

Explanation:

It is a memory element used in digital circuits.

44.

A 4 bit parallel type A/D converter uses a 6 volt reference. How many comparators are required and what is the resolution in volts?

 A. 0.375 V B. 15 V C. 4.5 V D. 10 V

Explanation:

No. of comparators = 2n - 1 = 24 - 1 = 15

.

45.

Quantization error occurs in

 A. D/A converter B. A/D converter C. both D/A and A/D converter D. neither D/A nor A/D converter