Top 350+ Solved Digital Logic Circuits (DLC) MCQ Questions Answer
Q. What is the hold condition of a flip-flop?
a. both s and r inputs activated
b. no active s or r input
c. only s is active
d. only r is active
Q. One example of the use of an S-R flip-flop is as
a. transition pulse generator
b. racer
c. switch debouncer
d. astable oscillator
Q. When both inputs of a J-K flip-flop cycle, the output will
a. be invalid
b. change
c. not change
d. toggle
Q. Which of the following is correct for a gated D-type flip-flop?
a. the q output is either set or reset as soon as the d input goes high or low
b. the output complement follows the input when enabled
c. only one of the inputs can be high at a time
d. the output toggles if one of the inputs is held high
Q. A basic S-R flip-flop can be constructed by cross-coupling of which basic logic gates?
a. and or or gates
b. xor or xnor gates
c. nor or nand gates
d. and or nor gates
Q. The logic circuits whose outputs at any instant of time depends only on the present input but also on the past outputs are called
a. combinational circuits
b. sequential circuits
c. latches
d. flip-flops
Q. Whose operations are more faster among the following?
a. combinational circuits
b. sequential circuits
c. latches
d. flip-flops
Q. In S-R flip-flop, if Q = 0 the output is said to be
a. set
b. reset
c. previous state
d. current state
Q. The output of latches will remain in set/reset untill
a. the trigger pulse is given to change the state
b. any pulse given to go into previous state
c. they don’t get any pulse more
d. the pulse is edge-triggered
Q. What is a trigger pulse?
a. a pulse that starts a cycle of operation
b. a pulse that reverses the cycle of operation
c. a pulse that prevents a cycle of operation
d. a pulse that enhances a cycle of operation
Q. A latch is an example of a
a. monostable multivibrator
b. astable multivibrator
c. bistable multivibrator
d. 555 timer