Flip-Flops and Timers MCQs

Question 1

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

Accepted Answer

The Q output is either SET or RESET as soon as the D input goes HIGH or LOW.

Answer

The output complement follows the input when enabled.

Answer

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

Answer

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

Question 2

When both inputs of a J-K flip-flop cycle, the output will:

Accepted Answer

not change

Answer

be invalid

Answer

change

Answer

toggle

Question 3

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

Accepted Answer

cross coupling

Answer

asynchronous operation

Answer

low input voltages

Answer

gate impedance

Question 4

The 555 timer can be used in which of the following configurations?

Accepted Answer

astable, monostable

Answer

monostable, bistable

Answer

astable, toggled

Answer

bistable, tristable

Question 5

A basic S-R flip-flop can be constructed by cross-coupling which basic logic gates?

Accepted Answer

NOR or NAND gates

Answer

AND or OR gates

Answer

XOR or XNOR gates

Answer

AND or NOR gates

Question 6

One example of the use of an S-R flip-flop is as a(n):

Accepted Answer

switch debouncer

Answer

transition pulse generator

Answer

astable oscillator

Answer

racer

Question 7

If both inputs of an S-R NAND latch are LOW, what will happen to the output?

Accepted Answer

The output would become unpredictable.

Answer

The output will toggle.

Answer

The output will reset.

Answer

No change will occur in the output.

Question 8

An astable multivibrator is a circuit that:

Accepted Answer

produces a continuous output signal

Answer

has two stable states

Answer

is free-running

Answer

is free-running and produces a continuous output signal

Question 9

What is another name for a one-shot?

Accepted Answer

monostable

Answer

bistable

Answer

astable

Answer

tristable