Flip-flop Objectives type questions :


Q.1 A flip-flop has two outputs which are _________.

a) always 0

b) always 1

c) always complementary

d) all of the above states

Answer: c

Q.2 A flip-flop can be made by using

a) basic gates such as AND, OR and NOT

b) NAND gates  

c) NOR gates

d) any of the above 

Answer: d

Q.3 Which of the following flip-flop is used as a latch?

a) J-K flip-flop

b) Master-slave flip-flop

c) T flip-flop

d) D flip-flop

Answer: d

Q.4 A flip-flop is used for storing

a) one bit of information

b) two bits of information

c) three bits of information

d) any number of bits of data

Answer: a

Q.5 When an inverter is placed between the inputs of an S-R flip-flop, then the flip-flop becomes

a) J-K flip-flop

b) Master-slave flip-flop

c) T flip-flop

d) D flip-flop  

Answer: d

Q.6 Which of the following input combinations are not allowed in an S-R flip-flop?

a) S = 0, R = 0

b) S = 0, R = 1

c) S = 1, R = 0

d) S = 1, R = 1

Answer: d

Q.7 The race around condition occurs in a J-K flip-flop when ________.

a) both inputs are 0

b) both inputs are 1

c) the inputs are complementary

d) any one of the above input combinations is present

Answer: b

Q.8 Master-slave configuration is used in flip-flops to

a) increase its clocking rate

b) reduce power dissipation

c) eliminate race-around condition

d) improve its reliability

Answer: c

Q.9 Flip-flops can be used to make

a) latches

b) bounce-elimination switches

c) registers

d) all of the above

Answer: c

Q.10 The following flip-flop is also referred as transparent as latch.

a) S-R flip-flop

b) D flip-flop

c) T flip-flop

d) J-K flip-flop

Answer: b

Q.11 The difference between a flip-flop & latch is

a) Flip-flops consists of an extra input

b) Both are same

c) Latches has one input but flip-flop has two

d) Latches has two input but flip-flop has one

Answer: c

Q. 12 Which of the following is a disadvantage of S-R flip-flop?

a) It has Race condition

b) It has no clock input

c) It has no enable state

d) Invalid State

Answer: d

Q.13 The toggle mode for a J-K flip-flop is

a) J = 0, K = 0

b) J = 1, K = 0

c) J = 0, K = 1  

d) J = 1, K = 1

Answer: d

Q.14 The characteristics of J-K flip-flops is similar to

a) D flip-flop

b) S-R flip-flop

c) T flip-flop

d) Gated T flip-flop

Answer: b

Q.15 Flip-flops can be used to make

a) latches

b) bounce-elimination switches

c) registers

d) all of the above

Answer: c


These are most asked Digital Electronics flip-flops mcqs with answers and most important digital electronics interview and Viva question.
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