industrial drives MCQs – Page 3

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

industrial drives Mcqs

41. For blowers which of the following motor is preferred ?
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A. Squirrel cage induction motor

B. D.C. series motor

C. D.C. shunt motor

D. Wound rotor induction motor

42. Which of the following machines has heavy fluctuation of load ?
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A. Lathe

B. Planer

C. g machine

D. Punching machine

43. Besides a constant speed a synchronous rotor possesses which of the following advantages ?
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A. Lower cost

B. Better efficiency

C. High power factor

D. All of the above

44. Which feature, while selecting a.motor for centrifugal pump, will be of least significance ?
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A. Operating speed

B. Horse power

C. Starting characteristics

D. Speed control

45. Which of the following types of motor enclosure is safest ?
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A. Totally enclosed

B. Open type

C. Semi closed

D. Totally enclosed fan cooled

46. A pony motor is used for the starting which of the following motors ?
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A. None of the above

B. Schrage motor

C. Squirel cage induction motor

D. Synchronous motor

47. Which of the following motors is usually preferred for kiln drives ?
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A. Three phase shunt wound com-mutator motor

B. Any of the above

C. Slip ring induction motor

D. Cascade controlled A.C. motor

48. In ________________ method of staging three phase induction motors the starting voltage is not reduced?
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A. any of the above

B. auto-transformer

C. star-delta

D. slip ring

49. For a particular application the type of electric-and control gear are determined by which of the following considerations ?
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A. All of the above

B. Limitation on starting current

C. Speed control range and its nature

D. Conditions of environment

E. Starting torque

50. ___________________is not a part of ball bearing ?
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A. Outer race

B. Inner race

C. Bush

D. Cage

51. _______________has the least value of starting torque to full load torque ratio?
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A. D.C. shunt motor

B. D.C. series motor

C. Slip ring induction motor

D. Squirrel cage induction motor

52. ___________________is preferred for synthetic fibre mills?
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A. Series motor

B. Synchronous motor

C. Shunt motor

D. Reluctance motor

53. The travelling speed of cranes varies from_________________?
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A. 5 to 10 m/s

B. 1 to 2.5 m/s

C. 10 to 15 m/s

D. 20 to 30 m/s

54. Which part of a motor needs maximum attention for maintenance ?
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A. Rotor winding

B. Rearing

C. Stator winding

D. Frame

55. For derries and winches which of the following drives can be used ?
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A. A.C. slip ring motors with variable resistance

B. Pole changing squirrel cage motors

C. D.C. motors with Ward-leonard con-trol

D. Any of the above

56. In which of the following applications variable speed operation is preferred ?
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A. Exhaust fan

B. Refrigerator

C. Ceiling fan

D. Water pump

57. Heavy duty cranes are used in________________?
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A. all of the above

B. steel plants

C. ore handling plants

D. heavy engineering workshops

58. Battery operated scooter for braking uses__________________?
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A. plugging

B. rheostatic braking

C. regenerative braking

D. mechanical braking

59. For which of the following applications motor has to start with high acceleration ?
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A. Centrifugal pump

B. Oil expeller

C. Lifts and hoists

D. Floor mill

60. Which of the following is essentially needed while selecting a motor ?
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A. Foundation pedal

B. Bearings

C. Pulley

D. Starter

Showing 41 to 60 of 71 mcqs