Digital Electronics MCQs SET-3 ⋆ csestudy247

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These MCQs Useful for DRDO CEPTAM, ISRO, COPA, CCC, O level, Bank, MTS, Railway, Data Entry Operator, PWD,PHED, Hindustan Aeronautics Ltd., Air India, NTPC, BHEL, GAIL, PGCIL, MTS, SSC, CGL, CHSL,KVS and all other computer exams.

This page provide you Digital Electronics MCQs

Q.41 Truth table is used to express

A) Boolean map

B) Boolean expression

C) Boolean expression

D) None

ANSWER= (B) Boolean expression

Q.42 The AND operation is equivalent to

A) Intersection

B) Union

C) Division

D) None

ANSWER= (A) Intersection

Q.43 The time required for a gate or inverter to change its state is called :

A) Rise time

B) Propagation time

C) Changing time

D) None

ANSWER= (B) Propagation time

Q.44 The minimum number of transistors can be used by 2 input AND gate is

A) 1

B) 2

C) 3

D) 4

ANSWER= (B) 2

Q.45 Which logic unit is the fastest of all the logic families?

A) CMOS

B) TTL

C) ECL

D) None

ANSWER= (C) ECL

Q.46 Counter can be used in the measurement of

A) Frequency

B) Time

C) Distance

D) All of these

ANSWER= (D) All of these

Q.47 The universal gate is

A) NAND gate

B) OR gate

C) AND gate

D) All of these

ANSWER= (A) NAND gate

Q.48 A byte is consist of ?

A) 2 bits

B) 4 bits

C) 8 bits

D) 16 bits

ANSWER= (C) 8 bits

Q.49 The Boolean expression A’B+AB’+AB is equivalent to

A) A.B

B) A+B

C) A’.B

D) None

ANSWER= (A) A.B

Q.50 EPROM contents can be erased by exposing it to

A) UV rays

B) By heat radiations

C) Infra red rays

D) None

ANSWER= (A) UV rays

Q.51 The number of output pins of a 8085 microprocessor are

A) 8

B) 16

C) 40

D) 64

ANSWER= (C) 40

Q.52 Which one of the following is 8-bit register in microprocessor ?

A) 16-bit program counter (PC)

B) Accumulator

C) 16-bit program counter (PC)

D) None

ANSWER= (B) Accumulator

Q.53 CMOS technology used in

A) Microprocessor

B) Digital logic

C) Both A & B

D) None

ANSWER= (C) Both A & B

Q.54 The use of OP-AMP is generally not preferred as ?

A) Integrator

B) Subtractor

C) Divider

D) None

ANSWER= (B) Subtractor

Q.55 In decimal system , the base or radix is the ?

A) 0

B) 1

C) 8

D) 10

ANSWER= (D) 10

Q.56 A binary system has radix of ?

A) 0

B) 1

C) 2

D) 10

ANSWER= (C) 2

Q.57 Which of the following is an universal gate ?

A) NOR

B) AND

C) XOR

D) NOT

ANSWER= (A) NOR

Q.58 The system on which digital system usually operates is

RRB JE 2015

A) Binary

B) Decimal

C) Octal

D) Hexadecimal

ANSWER= (A) Binary

Q.59 In Boolean Algebra the plus sign (+) indicates :

A) NOT Operation

B) AND Operation

C) OR Operation

D) None

ANSWER= (C) OR Operation

Q.60 LEDs are usually switched ON and OFF by

A) Diode in the circuit

B) Transistor circuit

C) Resistors in the circuit

D) None

ANSWER= (A) Diode in the circuit

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