Logic Gates MCQs

Question 1

A major advantage of ECL logic over TTL and CMOS is ________.

Accepted Answer

high speed

Answer

low power dissipation

Answer

both low power dissipation and high speed

Answer

neither low power dissipation nor high speed

Question 2

The output of an XOR gate is HIGH only when ________.

Accepted Answer

the two inputs are unequal

Answer

both inputs = 0

Answer

both inputs = 1

Answer

both inputs are undefined

Question 3

A 2-input gate that can be used to pass a digital waveform unchanged at certain times and inverted at other times is a(n) ________.

Accepted Answer

XOR gate

Answer

AND gate

Answer

OR gate

Answer

NAND gate

Question 4

When does the output of a NAND gate = 1?

Accepted Answer

Whenever a 0 is present at an input

Answer

Only when all inputs = 0

Answer

Whenever a 1 is present at an input

Answer

Only when all inputs = 1

Question 5

The number of input combinations for a 4-input gate is ________.

Accepted Answer

16

Answer

9

Answer

8

Answer

15

Question 6

When does the output of a NOR gate = 0?

Accepted Answer

Whenever a 1 is present at an input

Answer

Whenever a 0 is present at an input

Answer

Only when all inputs = 0

Answer

Only when all inputs = 1