digital logic Archives - Online MCQs Test Preparation for Competitive Exams

Which of the following adders can add three or more numbers at a time ?

A. Parallel adder
B. Carry-look-ahead adder
C. Carry-save-adder
D. Full adder

Option: C

The inverter OR-gate and AND gate are called deeision-making elements because they can recognize some input while disregarding others. A gate recognize a word when its output is

A. words,high
B. bytes,low
C. bytes,high
D. character,low

Option: A

Which one of the following logic expression is incorrect?

A. 1 ⊕ 0 = 1
B. 1 ⊕ 1 ⊕ 0 = 1
C. 1 ⊕ 1 ⊕ 1 = 1
D. 1 ⊕ 1 = 0

Option: B

Extremely low power dissipation and low cost per gate can be achieved in:

A. MOS ICs
B. C MOS ICs
C. TTL ICs
D. ECL ICs

Option: B

The number of two input multiplexers required to construct a 210 input multiplexer is,

A. 31
B. 10
C. 127
D. 1023

Option: D

If A ⊕ B = C, then

A. A ⊕ C = B
B. B ⊕ C = A
C. A ⊕ B ⊕ C = 0
D. Both (a) & (b)

Option: D