1. With which decoder it is possible to obtain many code conversions ?

2 line to 4 line

3 line to 8 line

not possible with any decoder

4 line to 16 line decoder

Answer: 4 line to 16 line decoder

Explanation:


2. The number of 4-line -to-16-line decoders required to make an 8-line-to-256-line decoder is ?

16

17

32

64

Answer: 17

Explanation:


3. In the toggle mode, a JK flip-flop has ?

J= 0, K= 0

J=0, K=1

J=1, K= 0

J=1, K=1

Answer: J=1, K=1

Explanation:


4. In a JK flip-flop, J is connected to Q’ and K is connected to Q outputs. The JK flip-flop converts into a ?

R-S flip-flop

D flip-flop

T flip-flop

Clocked R-S flip flop

Answer: T flip-flop

Explanation:


5. The 'race-around' condition occurs when ?

J = 0, K = 0

J = 0, K = 1

J = 1, K = 0

J = 1, K = 1

Answer: J = 1, K = 1

Explanation:


6. The functional difference between SR and JK flip-flops is that ?

JK flip-flop has a feedback path

JK flip-flop does not require any external clock

JK flip-flop is faster than SR flip-flop

JK flip-flop can accept both inputs

Answer: JK flip-flop can accept both inputs

Explanation:


7. When a flip-flop is reset, its output will be: ?

Q=Q; Q’=1

Q=1;Q’=0

Q = 0;Q’=0

Q=1;Q’=1

Answer: Q=Q; Q’=1

Explanation:


8. The basic R-S flip-flop is ?

a monostable multivibrator

a bistable multivibrator

an astable multivibrator

a Schmitt trigger

Answer: a bistable multivibrator

Explanation:


9. What is the number of selector lines required in a single input n-output demultiplexer ?

2

n

2^n

log? n

Answer: log? n

Explanation:


10. If S=0, R = 1 is a SR flip-flop, ?

Qn+1=Q’n

Qn+1 = Qn

Qn+1 = 0

Qn+1 = 1

Answer: Qn+1 = 0

Explanation: