Digital Circuit and Microprocessor MCQs

Question 1

A half adder includes

Accepted Answer

a AND gate with XOR gate

Answer

a NAND gate with OR gate

Answer

only AND gate

Answer

neither OR nor XOR nor AND gate

Question 2

For the circuit shown in Fig. 7.10 the output Xis given by

Accepted Answer

X=A+B

Answer

X = A +

Answer

X =A . "g

Answer

X =A A. B

Question 3

A NAND gate is called a universal logic element because

Accepted Answer

any logic function can be realized by NAND gates alone

Answer

it is used by every body

Answer

all the minimization techniques are applicable for optimum NAND gate realization

Answer

many digital computers use NAND gates.

Question 4

The Boolean expression ABC+ -ABC+A13-C+ABZ + -A-13"-E + A B C will be equal to

Accepted Answer

+ + A

Answer

C+B+A

Answer

A

Answer

C+ T3-A-

Question 5

The expression ABC (ABC +ATI C+ BC) when simplified for no assignment of binary values will take the value

Accepted Answer

1

Answer

0

Answer

A

Answer

ABC

Question 6

The complement of (A + B)(B + C) (A + C) will be

Accepted Answer

A B + B C + X T (d)A(B T +CT)

Answer

"X

Answer

X+

Question 7

The "bubble" or small circle, on the output of the NAND gate and NOR gate represents

Accepted Answer

Complementation

Answer

Addition

Answer

Subtraction

Answer

Product

Question 8

How many inputs can be supplied to a logic gate with a fan in factor of four?

Accepted Answer

Four

Answer

Two

Answer

Three

Answer

Eight

Question 9

Which circuit is used for a clock generator?

Accepted Answer

A free runnnig MV

Answer

JK flip-flop

Answer

Either of (a) and (b) above

Answer

Neither of (a) and (b) above