Digital Electronics 3

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Electronic Engineering MCQ Question Papers: ENTC, IT Interview Placement

Subject:  Digital Electronics 3

Part 3: List for questions and answers of Digital Electronics


Q1. The data stored by the memory element at any given instant of time is called the _____ state of the sequential circuit

a) Next

b) Present

c) Tri

d) None of these


Q2. A _________ is a combinational logic circuit

a) Adder

b) Flip flop

c) Counter

d) None of these


Q3. ______ is not a sequential circuit

a) Flip flop

b) Counter

c) Code converter

d) Shift register


Q4. Demultiplexer is __________

a) Sequential circuit

b) Combinational circuit

c) Either sequential or combinational circuit

d) None of above


Q5. ______ is also known as 1-bit memory cell

a) Flip-flop

b) Register

c) Gate

d) None of these


Q6. A flip flop is a

a) Combinational circuit

b) Memory element

c) Arithmetic element

d) Memory or arithmetic 


Q7. In a D flip flop

a) Data bit D is fed to S input and D’ to R Input

b) Data bit D is fed to R input and D’ to S input

c) Data bit D is fed to both R and S inputs

d) Data bit D is not fed to any input


Q8. The basic storage element in a digital system is__

a) Flip flop

b) Counter

c) Multiplexer

d) Encoder


Q9. D flip flop is used as _______

a) Differentiator

b) Divider circuit

c) Delay switch

d) All of these


Q10. A _______ is bistable logic circuit

a) Adder

b) Omparator

c) Flip flop

d) None of these


Q11. Qn represents the ______ value of a FF

a) Present state

b) Previous state

c) Next state

d) None of these


Q12. Group of FF s connected together forms ______

a) Counter

b) Register

c) Latch

d) None of these


Q13. The register that shifts data in only right direction is called a ____ shift register

a) Right

b) Left

c) Bidirectional

d) None of these 


Q14. A sequential circuit used for counting pulses is known as _______

a) Counter

b) Flip-flop

c) Register

d) None of these


Q15. The output of a _______ circuit at any instant of time is dependent only on the inputs present at the instant of time..

a) Combinational

b) Sequential

c) Combinational and sequential

d) None of these


Q16. ………… of a digital logic gate refers to the number of inputs.

a) Fan in

b) Fan-out

c) Figure of merit

d) None of these


Q17. If a logic circuit has a fan-out of 10 then the circuit …………. .

a) Has 10 inputs

b) Has 10 outputs

c) Can drive maximum of 10 inputs

d) Gives output 10 times the input


Q18. The figure of merit of logic family is given by …………….

a) Gain x bandwidth

b) Propagation delay time x power dissipation

c) Fan-out x propagation delay time

d) Noise margin x power dissipation


Q19. Which is the best figure of merit from the option below?

a) 1 pJ

b) 10 pJ

c) 50 pJ

d) 100 pJ 


Q20. The product of which of following gives the figure of merit of a logic family?

a) Gain and bandwidth

b) Propagation delay time and power dissipation

c) Fan-out and propagation delay time

d) Noise margin and power dissipation 


Part 3: List for questions and answers of Digital Electronics


Q1. Answer: b


Q2. Answer: a


Q3. Answer: c


Q4. Answer: b


Q5. Answer: a


Q6. Answer: b


Q7. Answer: a


Q8. Answer: a


Q9. Answer: c


Q10. Answer: c


Q11. Answer: a


Q12. Answer: b


Q13. Answer: a


Q14. Answer: a


Q15. Answer: a


Q16. Answer: a


Q17. Answer: c


Q18. Answer: b


Q19. Answer: a


Q20. Answer: a