Digital Electronics Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Digital Electronics ”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Digital Electronics comprehensively.

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1.
Most of the digital computers do not have floating point hardware because_____________?

Floating point hardware is costly

It is slower than software

It is not possible to perform floating point addition by hardware

Of no specific reason.

2.
A NAND gate is called a universal logic element because______________?

It is used by everybody

Any logic function can be realized by NAND gates alone

All the minization techniques are applicable for optimum NAND gate realization

Many digital computers use NAND gates

5.
Digital computers are more widely used as compared to analog computers, because they are______________?

Less expensive

Always more accurate and faster

Useful over wider ranges of problem types

Easier to maintain

6.
Consider the representation of six-bit numbers by two’s complement, one’s complement, or by sign and magnitude: In which representation is there overflow from the addition of the integers 011000 and 011000 ?

Two’s complement only

Sign and magnitude and one’s complement only

Two’s complement and one’s complement only

All three representations

9.
The number 1000 would appear just immediately after__________________?

FFFF (hex)

1111 (binary)

7777 (octal)

All of the above

10.
The number of Boolean functions that can be generated by n variables is equal to_________________?

2n

22 n

2n-1

11.
Positive logic in a logic circuit is one in which______________?

Logic 0 and 1 are represented by 0 and positive voltage respectively

Logic 0 and, -1 are represented by negative and positive voltages respectively

Logic 0 voltage level is higher than logic 1 voltage level

Logic 0 voltage level is lower than logic 1 voltage level

12.
Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is__________________?

TTLAS

CMOS

ECL

TTLLS

14.
NAND gates are preferred over others because these__________________?

Have lower fabrication area

Can be used to make any gate

Consume least electronic power

Provide maximum density in a chip

15.
An AND gate will function as OR if________________?

All the inputs to the gates are “1”

All the inputs are ‘0’

Either of the inputs is “1”

All the inputs and outputs are complemented

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