What is the primary function of a flip-flop in digital circuits?
A
Perform arithmetic operations B
Store a single bit of data C
Multiplex inputs D
Generate analog signals
Analysis & Theory
A flip-flop is a bistable device that stores one bit of binary data.
Which flip-flop has an undefined state when both inputs are 1?
A
JK flip-flop B
D flip-flop C
T flip-flop D
SR flip-flop
Analysis & Theory
The SR flip-flop is undefined (invalid) when both S and R inputs are 1 simultaneously.
In a D flip-flop, what does the output follow?
A
Clock B
Reset C
Input D D
Set
Analysis & Theory
D flip-flop output follows the D input at the clock edge (D → Q).
The JK flip-flop eliminates the invalid state of which flip-flop?
A
T flip-flop B
SR flip-flop C
D flip-flop D
None of these
Analysis & Theory
JK flip-flop removes the invalid state of the SR flip-flop by toggling on J=K=1.
Which flip-flop toggles its output when the input is HIGH?
A
SR B
JK C
T D
D
Analysis & Theory
The T (Toggle) flip-flop changes its state on each clock pulse when input T = 1.
What is the output of a T flip-flop when T=0 and clock is applied?
A
Toggles B
No change C
Reset D
Set
Analysis & Theory
T flip-flop retains its state when T=0, regardless of clock.
Which flip-flop requires only one input and a clock signal?
A
SR flip-flop B
D flip-flop C
T flip-flop D
JK flip-flop
Analysis & Theory
T flip-flop has one input (T) and toggles based on clock and input.
In a JK flip-flop, when J=1 and K=1, what is the output?
A
Set B
Reset C
No change D
Toggle
Analysis & Theory
JK flip-flop toggles when both J and K are 1.
Which flip-flop is also called a 'data latch'?
A
JK B
SR C
D D
T
Analysis & Theory
The D flip-flop is known as a data latch because it passes data input to output.
What is the minimum number of NAND gates required to build an SR flip-flop?
A
1 B
2 C
3 D
4
Analysis & Theory
An SR flip-flop can be built using 2 cross-coupled NAND gates.