Digital Electronics MCQs SET-3

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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

ANSWER= (B) Boolean expression


Q.42 The AND operation is equivalent to

ANSWER= (A) Intersection


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

ANSWER= (B) Propagation time


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



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



Q.46 Counter can be used in the measurement of

ANSWER= (D) All of these


Q.47 The universal gate is



Q.48 A byte is consist of ?

ANSWER= (C) 8 bits


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



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

ANSWER= (A) UV rays


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

ANSWER= (C) 40


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

ANSWER= (B) Accumulator


Q.53 CMOS technology used in

ANSWER= (C) Both A & B


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

ANSWER= (B) Subtractor


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

ANSWER= (D) 10


Q.56 A binary system has radix of ?



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



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

    RRB JE 2015

ANSWER= (A) Binary


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

ANSWER= (C) OR Operation


Q.60 LEDs are usually switched ON and OFF by

ANSWER= (A) Diode in the circuit

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