Flip-Flops/Counters MCQs

Question 1

What is another name for a one-shot?

Accepted Answer

Monostable

Answer

Multivibrator

Answer

Bistable

Answer

Astable

Question 2

On a master-slave flip-flop, when is the master enabled?

Accepted Answer

when the gate is HIGH

Answer

when the gate is LOW

Answer

both of the above

Answer

neither of the above

Question 3

What is the difference between the 7476 and the 74LS76?

Accepted Answer

the 7476 is master-slave, the 74LS76 is edge-triggered

Answer

the 7476 is master-slave, the 74LS76 is master-slave

Answer

the 7476 is edge-triggered, the 74LS76 is edge-triggered

Answer

the 7476 is edge-triggered, the 74LS76 is master-slave

Question 4

Which of the following is correct for a gated D flip-flop?

Accepted Answer

Q output follows the input D when the enable is HIGH.

Answer

The output toggles if one of the inputs is held HIGH.

Answer

Only one of the inputs can be HIGH at a time.

Answer

The output complement follows the input when enabled.

Question 5

With regard to a D latch, ________.

Accepted Answer

the Q output follows the D input when EN is HIGH

Answer

the Q output follows the D input when EN is LOW

Answer

the Q output is opposite the D input when EN is LOW

Answer

the Q output is HIGH regardless of EN's input state

Question 6

A 555 operating as a monostable multivibrator has an R1 of 1 M. Determine C1 for a pulse width of 2 s.

Accepted Answer

1.8 F

Answer

18 F

Answer

18 pF

Answer

18 nF

Question 7

Which of the following is correct for a D latch?

Accepted Answer

Q output follows the input D when the enable is HIGH.

Answer

The output toggles if one of the inputs is held HIGH.

Answer

Only one of the inputs can be HIGH at a time.

Answer

The output complement follows the input when enabled.

Question 8

A J-K flip-flop is in a "no change" condition when ________.

Accepted Answer

J = 0, K = 0

Answer

J = 1, K = 1

Answer

J = 1, K = 0

Answer

J = 0, K = 1

Question 9

A correct output is achieved from a master-slave J-K flip-flop only if its inputs are stable while the:

Accepted Answer

clock is HIGH

Answer

clock is LOW

Answer

slave is transferring

Answer

flip-flop is reset