Digital Circuit and Microprocessor MCQs

Question 1

Like a latch, the flip-flop belongs to a category of logic circuit knownes

Accepted Answer

bistable multivibrators

Answer

monostable multivibrators

Answer

astable multivibrators

Answer

none of these

Question 2

Which of the following flip-flops is used as a latch?

Accepted Answer

S-C flip-flop

Answer

J-K flip-flop

Answer

D flip-flop

Answer

T flip-flop

Question 3

A flip-flop which can have an uncertain output state is :

Accepted Answer

S-C flip-flop

Answer

_ J-K flip-flop

Answer

D flip-flop

Answer

T flip-flop

Question 4

The purpose of a clock input to a flip-flop is to

Accepted Answer

cause the output to assume a state dependent on the controlling (S - C, J-K or D) inputs

Answer

clear the device

Answer

set the device

Answer

always cause the output tochange the states

Question 5

A feature that distinguished the J-K flip-flop from an S-C flip-flop is the

Accepted Answer

toggle condition

Answer

preset input

Answer

type of clock

Answer

clear input

Question 6

A J-K flip-flop is in the toggle condition when

Accepted Answer

J = 1, K = 1

Answer

J= 1, K=0

Answer

J = 0, K = 0

Answer

J = 0, K = 1

Question 7

A J-K flip-flop with J 1 and K = 1 has a 10 kHz clock input. The Q = output is,

Accepted Answer

a 5 kHz square wave

Answer

constantly LOW

Answer

constantly HIGH

Answer

a 10 kHz square wave

Question 8

For an edge-triggered D flip-flop,

Accepted Answer

all of these answers

Answer

a change in the state of the flip-flop can occur only at a clock pulse edge

Answer

the state the flip-flop goes to depends on the D input

Answer

the output follows the input at each clock pulse

Question 9

The flip-flop shown in Fig. 7.6 logically behaves as

Accepted Answer

a I flip-flop

Answer

a D flip-flop

Answer

a J-K flip'-flop

Answer

an R-S flip-flop