Combinational Circuits MCQs

Which of the circuits in figure (a to d) is the sum-of-products implementation of figure ?

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Which of the following logic expressions represents the logic diagram shown?

• X=AB'+A'B

• X=(AB)'+AB

• X=(AB)'+A'B'

• X=A'B'+AB

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

• XOR

• XNOR

• AND

• XAND

For a two-input XNOR gate, with the input waveforms as shown below, which output waveform is correct?

• output a

• output b

• output c

• output d

What is the indication of a short to ground in the output of a driving gate?

• Only the output of the defective gate is affected

• There is a signal loss to all load gates

• The node may be stuck in either the HIGH or the LOW state

• The affected node will be stuck in the HIGH state

3 bits full adder contains

• 3 combinational inputs

• 4 combinational inputs

• 6 combinational inputs

• 8 combinational inputs

What is a multiplexer?

• It is a type of decoder which decodes several inputs and gives one output

• A multiplexer is a device which converts many signals into one

• It takes one input and results into many output

• None of the Mentioned

How many select lines would be required for an 8-line-to-1-line multiplexer?

• 2

• 4

• 8

• 3

How many NOT gates are required for the construction of a 4-to-1 multiplexer?

• 3

• 4

• 2

• 5

In the given 4-to-1 multiplexer, if c1 = 0 and c0 = 1 then the output M is

• X0

• X1

• X2

• X3