MCQ in Industrial Electronics Part 1 | ECE Board Exam

(Last Updated On: August 8, 2018)

MCQ in Industrial Electronics: Principles and Applications Part 1 | ECE Board Exam

This is the Multiples Choice Questions Part 1 of the Series in Industrial Electronics: Principles and Applications as one of the Electronics Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electronics Engineering field, Electronics Books, Journals and other Electronics References.

MCQ Topic Outline included in ECE Board Exam Syllabi

  • MCQ in Industrial Electronics
  • MCQ in Electronic Control System
  • MCQ in Industrial Solid State Services
  • MCQ in Welding Systems
  • MCQ in Thyristors
  • MCQ in High Frequency Heating
  • MCQ in Feedback Systems / Servomechanism
  • MCQ in Transducers
  • MCQ in Motor Speed Control Systems
  • MCQ in Robotic Principles
  • MCQ in Bioelectrical Principles
  • MCQ in Instrumentation and Control

Start Practice Exam Test Questions Part 1 of the Series

Choose the letter of the best answer in each questions.

1. What is a nucleonic sensing method employing usually one or more radioisotope sources and radiation detectors?

A. Radiation sensing

B. Sonic level sensing

C. Conductivity level sensing

D. Dielectric variation sensing

View Answer:

Answer: Option A

Solution:

2. What is concerned with the measurement of electric signals on the scalp with arise from the underlying neural activity in the brain (including synaptic sources)?

A. ECG

B. EEG

C. Ultrasound

D. EKG

View Answer:

Answer: Option B

Solution:

3. In therapeutic radiology and in nuclear medicine, the energies of interest range from about

A. 10 to 100 KeV

B. 100 to 10000 KeV

C. 10000 to 10000 KeV

D. 1 to 10 KeV

View Answer:

Answer: Option B

Solution:

4. Which of the following is a four-layer diode with an anode gate and a cathode gate?

A. SCS

B. SCR

C. SBS

D. SUS

View Answer:

Answer: Option A

Solution:

5. What is basically a two-terminal parallel-inverse combination of semiconductor layers that permits triggering in either direction?

A. Diac

B. Triac

C. Quadrac

D. Shockley Diode

View Answer:

Answer: Option A

Solution:

6. What is the typical value of the interbase resistance of UJTs?

A. 20 KΩ

B. Between 4 to 4 KΩ

C. 4 KΩ

D. Between 4 to 10 KΩ

View Answer:

Answer: Option D

Solution:

7. PUT stands for

A. Programmable Unijunction Transistor

B. Programmable Universal Transistor

C. Pulse Unijunction Transistor

D. Pulse Universal Transistor

View Answer:

Answer: Option A

Solution:

8. Which transistor conducts current in both directions when turned on?

A. Diac

B. SCR

C. Quadrac

D. SCS

View Answer:

Answer: Option A

Solution:

9. What is a three terminal device used to control large current to a load?

A. SCR

B. SCS

C. GTO

D. Thyristor

View Answer:

Answer: Option A

Solution:

10. What is the other term for thermoelectric effect?

A. Seebeck effect

B. Hall effect

C. Photoelectric effect

D. Thermal effect

View Answer:

Answer: Option A

Solution:

11. What are the regions corresponding to open-circuit condition for the controlled rectifier which block the flow of charge from anode to cathode?

A. Forward blocking regions

B. Reverse blocking regions

C. Breakdown regions

D. Both A and B above

View Answer:

Answer: Option D

Solution:

12. The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ________ in the quotation.

A. SCR

B. UJT

C. Transistor

D. SCS

View Answer:

Answer: Option A

Solution:

13. When the temperature increases, the inter-base resistance of a UJT

A. Remains unchanged

B. Increases

C. Decreases

D. is zero

View Answer:

Answer: Option B

Solution:

14. The three terminals of a triac are

A. drain, source, gate

B. two main terminals and a gate terminal

C. cathode, anode and gate

D. anode, source, gate

View Answer:

Answer: Option B

Solution:

15. A triac is equivalent to two SCRs

A. in parallel

B. in inverse-parallel

C. in series

D. in inverse-series

View Answer:

Answer: Option B

Solution:

16. In diagnostic radiology and for superficial therapy purposes, the energy spectrum of radiation varies from about

A. 1 to 10 KeV

B. 10 to 100 KeV

C. 100 to 10000 KeV

D. 10000 to 100000 KeV

View Answer:

Answer: Option B

Solution:

17. The x-ray region of the electromagnetic spectrum has a corresponding range of wavelengths from

A. 0.1 to 0.0001 nm

B. 0.1 to 0.0001 pm

C. 0.1 to 0.0001 μm

D. 0.1 to 0.0001 mm

View Answer:

Answer: Option A

Solution:

18. The three terminals of an SCR are the

A. anode, cathode, and grid

B. cathode, anode, gate

C. anode, cathode, drain

D. drain, source, gate

View Answer:

Answer: Option B

Solution:

19. If a body is considered as a conducting sphere of 0.5m radius its capacitance to infinity is

A. 55 pF

B. 55 nF

C. 55 μF

D. 55 F

View Answer:

Answer: Option A

Solution:

20. How many semiconductor layers does an SCR have?

A. Four

B. Two

C. Three

D. Five

View Answer:

Answer: Option A

Solution:

21. A triac is a _______ switch.

A. unidirectional

B. mechanical

C. bidirectional

D. omnidirectional

View Answer:

Answer: Option C

Solution:

22. Which of the following is the normal way to turn on an SCR?

A. By breakover voltage

B. By appropriate anode current

C. By appropriate cathode current

D. By appropriate gate current

View Answer:

Answer: Option D

Solution:

23. A triac can pass a portion of ________ half cycle through the load

A. only positive

B. only negative

C. both positive and negative

D. neither positive nor negative

View Answer:

Answer: Option C

Solution:

24. A diac has how many terminals?

A. Two

B. Three

C. Four

D. Five

View Answer:

Answer: Option A

Solution:

25. An SCR combines the feature of

A. a rectifier and resistance

B. a rectifier and capacitor

C. a rectifier and transistor

D. a rectifier and inductor

View Answer:

Answer: Option C

Solution:

26. Which is the control element in an SCR?

A. Anode

B. Cathode

C. Gate

D. Cathode supply

View Answer:

Answer: Option C

Solution:

27. How many semiconductor layers does a triac have?

A. Two

B. Four

C. Three

D. One

View Answer:

Answer: Option B

Solution:

28. A diac has how many semiconductor layers?

A. Three

B. Four

C. Two

D. Five

View Answer:

Answer: Option A

Solution:

29. The p-type emitter of a UJT is _______ doped.

A. lightly

B. moderately

C. heavily

D. not

View Answer:

Answer: Option C

Solution:

30. A diac has

A. one pn junction

B. three pn junctions

C. two pn junctions

D. four pn junctions

View Answer:

Answer: Option C

Solution:

31. A UJT is sometimes called a _______ diode.

A. double-based

B. single-based

C. a rectifier

D. a switching diode

View Answer:

Answer: Option A

Solution:

32. A diac is _______ switch.

A. an AC

B. a mechanical

C. a dc

D. both ac and dc

View Answer:

Answer: Option A

Solution:

33. An SCR is made of silicon and not germanium because silicon.

A. is inexpensive

B. has low leakage current

C. is mechanically strong

D. is tetravalent

View Answer:

Answer: Option B

Solution:

34. What is the control element in an SCR?

A. Gate

B. Anode

C. Grid

D. Cathode

View Answer:

Answer: Option A

Solution:

35. An effect that reduces the possibility of accidental triggering of the SCS.

A. Miller effect

B. Rate effect

C. End effect

D. Flywheel effect

View Answer:

Answer: Option B

Solution:

36. Which of the following is a common application of UJT?

A. Amplifier

B. Rectifier

C. Mulitivibrator

D. Sawtooth generator

View Answer:

Answer: Option D

Solution:

37. Which device does not have a gate terminal?

A. Triac

B. SCR

C. FET

D. Diac

View Answer:

Answer: Option D

Solution:

38. An SCR is a _______ triggered device.

A. current

B. power

C. voltage

D. noise

View Answer:

Answer: Option A

Solution:

39. When UJTs is turned on, the resistance between emitter terminal and lower base terminal

A. remains unchanged

B. increases

C. decreases

D. becomes zero

View Answer:

Answer: Option C

Solution:

40. The UJT has

A. two pn junctions

B. three pn junctions

C. one pn junction

D. four on junction

View Answer:

Answer: Option C

Solution:

41. The UJT may be used as

A. an amplifier

B. a rectifier

C. a sawtooth generator

D. a multivibrator

View Answer:

Answer: Option C

Solution:

42. Which of the following is the normal way to turn on a diac?

A. By breakover voltage

B. By gate voltage

C. By gate current

D. By anode current

View Answer:

Answer: Option A

Solution:

43. Power electronics deals with the control of ac power at what frequencies essentially?

A. 20 KHz

B. 1000 KHz

C. Frequencies less than 10 Hz

D. 60 Hz frequency

View Answer:

Answer: Option D

Solution:

44. When the emitter terminal of a UJT is open, the resistance between the base-terminals is generally

A. low

B. extremely low

C. high

D. extremely high

View Answer:

Answer: Option C

Solution:

45. AC power in a load can be controlled by connecting

A. two SCRs in series

B. two SCRs in parallel

C. two SCRs in parallel opposition

D. two SCRs in series opposition

View Answer:

Answer: Option C

Solution:

46. Which equation defines the intrinsic stand off ratio (η) of UJTs?

A. RB1 / (RB1 + RB2)

B. (RB1 + RB2) / RB1

C. (RB1 + RB2) / RB2

D. RB1 + RB2

View Answer:

Answer: Option A

Solution:

47. To turn off the SCR, which of the following is done?

A. Reduce gate voltage to zero

B. Reverse bias the gate

C. Reduce anode voltage to zero

D. Reduce cathode voltage to zero

View Answer:

Answer: Option C

Solution:

48. Control system that maintains a speed voltage, or other variable within specified limits of a preset level.

A. Controller

B. Regulator

C. Sensor

D. Computer

View Answer:

Answer: Option B

Solution:

49. To turn on the UJT, the forward bias on emitter diode should be ________ the peak point voltage.

A. more than

B. less than

C. equal to

D. twice

View Answer:

Answer: Option A

Solution:

50. When the temperature increases, the intrinsic stand off ratio

A. increases

B. decreases

C. essentially constant

D. becomes zero

View Answer:

Answer: Option C

Solution:

Questions and Answers in Industrial Electronics

Following is the list of multiple choice questions in this brand new series:

MCQ in Industrial Electronics Principles and Applications
PART 1: MCQ from Number 1 – 50                        Answer key: PART 1
PART 2: MCQ from Number 51 – 100                   Answer key: PART 2
PART 3: MCQ from Number 101 – 150                 Answer key: PART 3
PART 4: MCQ from Number 151 – 200                 Answer key: PART 4
PART 5: MCQ from Number 201 – 250                 Answer key: PART 5
PART 6: MCQs from Number 251 – 300                 Answer key: PART 6
PART 7: MCQ from Number 301 – 350                 Answer key: included
PART 8: MCQ from Number 351 – 400                 Answer key: included

Complete List of MCQs in Electronics Engineering per topic

MCQ in Industrial Electronics Part 1 | ECE Board Exam
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