Control Devices for Industrial Motors Interview Questions:

Following are the below Control Devices for Industrial Motors Interview Questions and Important Questions which is very useful for interviews and exams

1. What is meant by control gear ? Give the advantages of automatic control over manual control.

2. What is thyratron? How does it differ in construction and properties from triode ? Give it uses too.

3. What is an ignitron ? What is its usual application ?

4. How does an amplidyne differ from an ordinary dc generator ? Give its construction, principle of operation and uses.

5. Describe drawing neat sketches the principle of working and construction of magnetic amplifier. Why ac windings are provided in pair ? Mention a few applications of magnetic amplifiers.

6. Explain with diagram the principle of operation of magnetic amplifiers, rotating amplifiers and thyristors.

7. Why are solid state devices becoming more and more popular in industry nowadays ? What is diode? Give its V-I characteristic and uses.

8. What is Zener diode ? Give its schematic symbol and uses.

9. What is an SCR ? Give its volt-ampere characteristic and typical parameters.

10. With a neat diagram explain the constructional features of a triac. Sketch its V-I characteristics. How does it differ from an SCR ? Mention its applications.

11. What is diac ? Give its schematic symbol, V-I characteristic and uses.

12. What is GTO ? Give its schematic symbol and its advantages over SCR.

13. Describe the construction of a dc electromagnetic contactor.

14. What is a relay ? What are their applications ?

15. What are the differences between an amplidyne and an ordinary dc generator ?

16. How does a saturable reactor differ from an ordinary reactor ? Explain.

17. Distinguish clearly the primary control devices and pilot control devices of a motor.

18. Explain the action of (i) push buttons (ii) limit switches (iii) float switches (iv) pressure switches (v) thermostats (vi) speed governors (vii) plugging switches and (viii) master controllers.

19. Write short notes on the following :

  • Amplidyne
  • Magnetic amplifier
  • Thyratron and its applications
  • SCR
  • Triac, diac and GTO switch.

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