industrial drives MCQs – Page 2

Practise focused industrial drives questions with marked answers for exam preparation and subject revision.

industrial drives Mcqs

21. A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is____________________?
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A. low windage losses

B. slop speed operation

C. high starting torque

D. all of the above

22. For crane travel which of the following motors is normally used ?
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A. D.C. differentially compound motor

B. Synchronous motor

C. AC. slip ring motor

D. Ward-Leonard controlled D.C. shunt motor

23. For a motor-generator set which of the following motors will be preferred ?
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A. Slip ring induction motor

B. Synchronous motor

C. Squirrel cage induction motor

D. Pole changing induction motor

24. For which of the following applications D.C. motors are still preferred ?
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A. Reversibility

B. Variable speed drive

C. High efficiency operation

D. High starting torque

25. need frequent starting and stopping of electric motors ?
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A. Paper mills

B. Lifts and hoists

C. Air-conditioners

D. Grinding mills

26. Which of the following motors are best for the rolling mills ?
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A. Squirrel cage induction motors

B. Single phase motors

C. Slip ring induction motors

D. D.C. motors

27. _________________method of starting a three phase induction motor needs six terminals ?
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A. Star-delta

B. Resistance starting

C. Auto-transformer

D. None of the above

28. Ward-Leonard controlled D.C. drives are generally used for _____________________ excavators?
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A. Light duty

B. Heavy duty

C. All of the above

D. Medium duty

29. Rotor of a motor is usually supported on ___________________ bearings?
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A. ball or roller

B. needle

C. thrust

D. bush

30. Which of the following motors is preferred for boom hoist of a travelling crane ?
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A. Single phase motor

B. Synchronous motor

C. A.C. slip ring motor

D. Ward-Leonard controlled D.C. shunt motor

31. Reluctance motor is a________________?
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A. low noise, slow speed motor

B. low torque variable speed motor

C. variable torque motor

D. self starting type synchronous motor

32. The size of an excavator is usually expressed in terms of_________________?
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A. crowd motion

B. cubic metres

C. travel in metres

D. angle of swing

33. Which of the following motors is preferred when smooth and precise speed control over a wide range is desired ?
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A. Squirrel cage induction motor

B. Synchronous motor

C. D.C. motor

D. Wound rotor induction motor

34. In a paper mill where constant speed is required________________?
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A. group drive is preferred

B. individual drive is preferred

C. synchronous motors are preferred

D. A.C. motors are preferred

35. Which of the following alternatives will be cheaper ?
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A. Five motors of 20 H.P. each

B. Four motors of 25 H.P. each

C. A 100 H.P. AC. three phase motor

D. Ten motors of 10 H.P. each

36. Which of the following motors is preferred when quick speed reversal is the main consideration ?
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A. D.C. motor

B. Squirrel cage induction motor

C. Synchronous motor

D. Wound rotor induction motor

37. Which of the following happens when star-delta starter is used ?
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A. Starting voltage is reduced

B. Starting current is reduced

C. Both A. and B.

D. None of the above

38. __________________ has relatively wider range of speed control?
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A. D.C. shunt motor

B. Squirrel cage induction motor

C. Ship ring induction motor

D. Synchronous motor

39. By the use of which of the following m D.C. can be obtained from AC. ?
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A. Mercury arc rectifier

B. Motor generator set

C. Silicon diodes

D. Any of the above

40. In which of the following applications the load on motor changes in cyclic order ?
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A. Electric shovels

B. All of the above

C. Rolling mills

D. Cranes

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