Practice Digital Principles And System Design Multiple Choice Questions with Answers Quiz-1

Q.1.

How is an encoder different from a decoder?

the output of an encoder is a binary code for 1-of-n input
the output of a decoder is a binary code for n-of-1 output
the output of an encoder is a binary code for n-of-1 output
the output of a decoder is a binary code for 1-of-n input

Q.2.

What is a multiplexer?

it is a type of decoder which decodes several inputs and gives one output
it takes one input and results into many output
a multiplexer is a device which converts many signals into one
it is a type of encoder which decodes several inputs and gives one output

Q.3.

Binary coded decimal is a combination of

two binary digits
three binary digits
four binary digits
five binary digits

Q.4.

What is the function of an enable input on a multiplexer chip?

to apply vcc
to active the entire chip
to connect ground
to active one half of the chip

Q.5.

Which is the major functioning responsibility of the multiplexing combinational circuit?

decoding the binary information
encoding of binary information
generation of selected path between multiple sources and a single destination
generation of all minterms in an output function with or-gate

Q.6.

Latches constructed with NOR and NAND gates tend to remain in the latched condition due to which configuration feature?

low input voltages
synchronous operation
gate impedance
cross coupling

Q.7.

In which of the following gates the output is 1 if and only if at least one input is 1?

and
nor
nand
or

Q.8.

Which of the following combinations of logic gates can decode binary 1101?

one 4-input and gate
one 4-input and gate, one inverter
one 4-input and gate, one or gate
one 4-input nand gate, one inverter

Q.9.

Which of following are known as universal gates?

nand & nor
and & or
xor & or
ex-nor & xor

Q.10.

Can an encoder be called as multiplexer?

no
yes
sometimes
never

Q.11.

The prime implicant which has at least one element that is not present in any other implicant is known as

essential prime implicant
implicant
complement
prime complement

Q.12.

The NAND latch works when both inputs are

1
0
inverted
don’t cares

Q.13.

What type of logic circuit is represented by the figure shown below?

xor
xnor
and
xand

Q.14.

How many bits would be required to encode decimal numbers 0 toin straight binary codes?

12
14
16
18

Q.15.

What is the minimum number of two input NAND gates used to perform the function of two input OR gates?

one
two
three
four

Q.16.

What do you call the intermediate terms in binary multiplication?

multipliers
mid terms
partial products
multiplicands

Q.17.

The purpose of a Digital Comparator is

to create different outputs
to convert analog input into digital
to add a set of different numbers
to compare a set of variables or unknown numbers

Q.18.

How many types of digital comparators are?

1
2
3
4

Q.19.

Which one is a basic comparator?

xor
xnor
and
nand

Q.20.

How many AND, OR and EXOR gates are required for the configuration of full adder?

1, 2, 2
2, 1, 2
3, 1, 2
4, 0, 1

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