MCQs in Industrial Electronics: Principles and Applications Part I

(Last Updated On: December 8, 2017)

MCQs in  Industrial Electronics: Principles and Applications - MCQs Part I

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.

Multiple Choice Questions Topic Outline

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

The  Series

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

Industrial Electronics Principles and Applications MCQs
PART 1: MCQs from Number 1 – 50                        Answer key: PART I
PART 2: MCQs from Number 51 – 100                   Answer key: PART II
PART 3: MCQs from Number 101 – 150                 Answer key: PART III
PART 4: MCQs from Number 151 – 200                 Answer key: PART IV
PART 5: MCQs from Number 201 – 250                 Answer key: PART V
PART 6: MCQs from Number 251 – 300                 Answer key: PART VI

Start Practice Exam Test Questions Part 1 of the Series

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

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

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

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

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

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

7. PUT stands for

  • A. Programmable Unijunction Transistor
  • B. Programmable Universal Transistor
  • C. Pulse Unijunction Transistor
  • D. Pulse Universal Transistor

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

  • A. Diac
  • B. SCR
  • C. Quadrac
  • D. SCS

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

  • A. SCR
  • B. SCS
  • C. GTO
  • D. Thyristor

10. What is the other term for thermoelectric effect?

  • A. Seebeck effect
  • B. Hall effect
  • C. Photoelectric effect
  • D. Thermal effect

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

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

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

  • A. Remains unchanged
  • B. Increases
  • C. Decreases
  • D. is zero

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

15. A triac is equivalent to two SCRs

  • A. in parallel
  • B. in inverse-parallel
  • C. in series
  • D. in inverse-series

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

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

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

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

20. How many semiconductor layers does an SCR have?

  • A. Four
  • B. Two
  • C. Three
  • D. Five

21. A triac is a _____ switch.

  • A. unidirectional
  • B. mechanical
  • C. bidirectional
  • D. omnidirectional

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

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

24. A diac has how many terminals?

  • A. Two
  • B. Three
  • C. Four
  • D. Five

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

26. Which is the control element in an SCR?

  • A. Anode
  • B. Cathode
  • C. Gate
  • D. Cathode supply

27. How many semiconductor layers does a triac have?

  • A. Two
  • B. Four
  • C. Three
  • D. One

28. A diac has how many semiconductor layers?

  • A. Three
  • B. Four
  • C. Two
  • D. Five

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

  • A. lightly
  • B. moderately
  • C. heavily
  • D. not

30. A diac has

  • A. one pn junction
  • B. three pn junctions
  • C. two pn junctions
  • D. four pn junctions

31. A UJT is sometimes called a ____ diode.

  • A. double-based
  • B. single-based
  • C. a rectifier
  • D. a switching diode

32. A diac is _____ switch.

  • A. an AC
  • B. a mechanical
  • C. a dc
  • D. both ac and dc

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

34. What is the control element in an SCR?

  • A. Gate
  • B. Anode
  • C. Grid
  • D. Cathode

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

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

  • A. Amplifier
  • B. Rectifier
  • C. Mulitivibrator
  • D. Sawtooth generator

37. Which device does not have a gate terminal?

  • A. Triac
  • B. SCR
  • C. FET
  • D. Diac

38. An SCR is a _____ triggered device.

  • A. current
  • B. power
  • C. voltage
  • D. noise

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

40. The UJT has

  • A. two pn junctions
  • B. three pn junctions
  • C. one pn junction
  • D. four on junction

41. The UJT may be used as

  • A. an amplifier
  • B. a rectifier
  • C. a sawtooth generator
  • D. a multivibrator

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

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

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

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

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

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

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

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

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

  • A. increases
  • B. decreases
  • C. essentially constant
  • D. becomes zero

Complete List of MCQs in Electronics Engineering per topic

credit: © 2014 www.PinoyBIX.org
MCQs in Industrial Electronics: Principles and Applications Part I
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