Digital Electronics 6

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Electronic Engineering MCQ Question Papers: ENTC, IT Interview Placement

Subject:  Digital Electronics 6

Part 6: List for questions and answers of Digital Electronics


Q1. Any number with an exponent of zero is equal to:

a) Zero

b) One

c) That number

d) Ten


Q2. In the decimal numbering system, what is the MSD?

a) The middle digit of a stream of numbers

b) The digit to the right of the decimal point

c) The last digit on the right

d) The digit with the most weight


Q3. Which of the following statements does NOT describe an advantage of digital technology?

a) The values may vary over a continuous range

b) The circuits are less affected by noise

c) The operation can be programmed

d) Information storage is easy


Q4. The generic array logic (GAL) device is ________

a) One-time programmable

b) Reprogrammable

c) A CMOS device

d) Reprogrammable and a CMOS device


Q5. The range of voltages between VL(max) and VH(min) are ________

a) Unknown

b) Unnecessary

c) Unacceptable

d) Between 2 V and 5 V


Q6. What is a digital-to-analog converter?

a) It takes the digital information from an audio CD and converts it to a usable form

b) It allows the use of cheaper analog techniques, which are always simpler

c) It stores digital data on a hard drive

d) It converts direct current to alternating current 


Q7. What are the symbols used to represent digits in the binary number system?

a) 0,1

b) 0,1,2

c) 0 through 8

d) 1,2


Q8. A full subtracter circuit requires ________

a) Two inputs and two outputs

b) Two inputs and three outputs

c) Three inputs and one output

d) Three inputs and two outputs


Q9. The output of an AND gate is LOW ________

a) All the time

b) When any input is LOW

c) When any input is HIGH

d) When all inputs are HIGH


Q10. Give the decimal value of binary 10010

a) 610

b) 910

c) 1810

d) 2010


Q11. Parallel format means that

a) Each digital signal has its own conductor

b) Several digital signals are sent on each conductor

c) Both binary and hexadecimal can be used

d) No clock is needed


Q12. A decoder converts ________

a) Noncoded information into coded form

b) Coded information into noncoded form

c) HIGHs to LOWs

d) LOWs to HIGHs


Q13. A DAC changes ________

a) An analog signal into digital data

b) Digital data into an analog signal

c) Digital data into an amplified signal

d) None of the above 


Q14. The output of a NOT gate is HIGH when _______

a) The input is LOW

b) The input is HIGH

c) The input changes from LOW to HIGH

d) Voltage is removed from the gate


Q15. The output of an OR gate is LOW when _______

a) All inputs are LOW

b) Any input is LOW

c) Any input is HIGH

d) All inputs are HIGH


Q16. Which of the following is not an analog device?

a) Thermocouple

b) Current flow in a circuit

c) Light switch

d) Audio microphone


Q17. A demultiplexer has ________

a) One data input and a number of selection inputs, and they have several outputs

b) One input and one output

c) Several inputs and several outputs

d) Several inputs and one output


Q18. A flip-flop has ________

a) One stable state

b) No stable states

c) Two stable states

d) None of the above


Q19. Digital signals transmitted on a single conductor (and a ground) must be transmitted in

a) Slow speed

b) Parallel

c) Analog

d) Serial 


Q20. In a certain digital waveform, the period is four times the pulse width. The duty cycle is ________

a) 0%

b) 25%

c) 50%

d) 100% 


Part 6: List for questions and answers of Digital Electronics


Q1. Answer: b


Q2. Answer: d


Q3. Answer: a


Q4. Answer: b


Q5. Answer: c


Q6. Answer: a


Q7. Answer: a


Q8. Answer: d


Q9. Answer: b


Q10. Answer: c


Q11. Answer: a


Q12. Answer: b


Q13. Answer: b


Q14. Answer: a


Q15. Answer: a


Q16. Answer: c


Q17. Answer: a


Q18. Answer: c


Q19. Answer: d


Q20. Answer: b