Digital Circuit and Microprocessor MCQs

Question 1

A J-K flip-flop is a device to

Accepted Answer

divide the frequency by 2

Answer

divide the frequency by 4

Answer

generate waveform of tsame frequency as that of the input

Answer

cannot be used for frequency division

Question 2

A 1 Its pulse can be converted into a 1 ms pulse by using

Accepted Answer

a monostable multivibrator

Answer

an astable multivibrator a bistable multivibrator

Answer

(e) a J-K flip-flop

Answer

None of these

Question 3

The following is not a sequential circuit

Accepted Answer

full-adder

Answer

J-K flip-flop

Answer

counter

Answer

shift register

Question 4

A one= shot is a type of

Accepted Answer

monostable multivibrator

Answer

astable multivibrator

Answer

bistable multivibrator

Answer

timer

Question 5

An astable multivibrator

Accepted Answer

is an oscillator

Answer

requires a periodic trigger input

Answer

has one stable states

Answer

produces a non-periodic pulse output

Question 6

A 1 msec pulse can be converted to a 10 msec pulse by using :

Accepted Answer

a monostable multivibrator

Answer

an astable multivibrator

Answer

a bistable multivibrator

Answer

a J-K flip-flop

Question 7

A retriggerable one shot is one which

Accepted Answer

is capable of being triggered while the output is being generated

Answer

can be triggered only once

Answer

has two quassi-stable states

Answer

cannot be triggered until full pulse has been outputted

Question 8

The output of the circuit shown in Fig. 7.7 will be

Accepted Answer

squarewaves

Answer

delayed pulses

Answer

trianglular waves

Answer

trapezoidal waves

Question 9

The input waveform Vi and the output waveform Vo of a Schmitt NAND are shown in Fig. 7.8. The duty cycle of the output waveform is

Accepted Answer

72.20%

Answer

100%

Answer

85.50%

Answer

25%