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MCQs

Total Questions : 86 | Page 6 of 9 pages
Question 51. Is preferred for synthetic fibre mills.
  1.    Synchronous motor
  2.    Reluctance motor
  3.    Series motor
  4.    Shunt motor
 Discuss Question
Answer: Option B. -> Reluctance motor
Question 52. While selecting motor for an air conditioner which of the following characteristics is of great importance?
  1.    Type of bearings
  2.    Type of enclosure
  3.    Noise
  4.    Arrangement for power transmission
 Discuss Question
Answer: Option C. -> Noise
Question 53. Besides a constant speed a synchronous rotor possesses which of the following advantages?
  1.    Lower cost
  2.    Better efficiency
  3.    High power factor
  4.    All of the above
 Discuss Question
Answer: Option C. -> High power factor
Question 54. __________ motor is a constant speed motor.
  1.    Synchronous motor
  2.    Schrage motor
  3.    Induction motor
  4.    Universal motor
 Discuss Question
Answer: Option A. -> Synchronous motor
Question 55. Is preferred for automatic drives.
  1.    Squirrel cage induction motor
  2.    Synchronous motors
  3.    Ward Leonard controlled D.C. motors
  4.    Any of the above
 Discuss Question
Answer: Option C. -> Ward Leonard controlled D.C. motors
Question 56. In ________ the speed can be varied by changing the position of brushes.
  1.    Slip ring motor
  2.    Schrage motor
  3.    Induction motor
  4.    Repulsion motor
 Discuss Question
Answer: Option B. -> Schrage motor
Question 57. Which of the following motors are best for the rolling mills?
  1.    Single phase motors
  2.    Squirrel cage induction motors
  3.    Slip ring induction motors
  4.    D.C. motors
 Discuss Question
Answer: Option D. -> D.C. motors
Question 58. Which of the following motors is usually preferred for kiln drives?
  1.    Cascade controlled A.C. motor
  2.    Slip ring induction motor
  3.    Three phase shunt wound commutator motor
  4.    Any of the above
 Discuss Question
Answer: Option D. -> Any of the above
Question 59. In which of the following applications variable speed operation is preferred?
  1.    Exhaust fan
  2.    Ceiling fan
  3.    Refrigerator
  4.    Water pump
 Discuss Question
Answer: Option B. -> Ceiling fan
Question 60. For crane travel which of the following motors is normally used?
  1.    Synchronous motor
  2.    D.C. differentially compound motor
  3.    Ward-Leonard controlled D.C. shunt motor
  4.    AC. slip ring motor
 Discuss Question
Answer: Option D. -> AC. slip ring motor

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