Digital Circuit and Microprocessor MCQs

Question 1

According to Boolean algebra 1 + A + B+ C is equal to

Accepted Answer

1

Answer

A+B+C

Answer

ABC

Answer

1 +ABC

Question 2

(A + B + A B) is the same as

Accepted Answer

1

Answer

0

Answer

C

Answer

T

Question 3

Three Boolean operators are

Accepted Answer

OR, NOT, AND

Answer

OR, NOR, NAND

Answer

NOT, NOR, NAND

Answer

None of the above

Question 4

The truth table given below is for

Accepted Answer

AND gate

Answer

NAND gate

Answer

OR gate

Answer

NOR gate

Question 5

Positive logic in a logic circuit is one in which

Accepted Answer

logic 0 voltage level is lower than logicl voltage level

Answer

logic 0 and 1 are reprennted by 0 and positive voltage respectively

Answer

logic 0 and 1 are represented by negative and positive voltage respectively

Answer

logic 0 voltage level is higher than logic 1 voltage level

Question 6

Which of the following is an inverter?

Accepted Answer

Common emitter amplifier

Answer

Common base amplifier

Answer

Common collector amplifier

Answer

All of the above

Question 7

A combination of AND function and NOT function results in

Accepted Answer

NAND gate

Answer

OR gate

Answer

inversion

Answer

NOR gate

Question 8

It is required to determine the logical output of the circuit shownin figure, built using NAND gates. Pick up the correct answer

Accepted Answer

A+ B

Answer

A. B

Answer

A +

Answer

A 171 + X ITt

Question 9

A + B = Y is Boolean expression for

Accepted Answer

NOR gate

Answer

OR gate

Answer

Inversion

Answer

NAND gate