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MCQs

Total Questions : 473 | Page 7 of 48 pages
Question 61. In an induction motor, no-load the slip is generally
  1.    Less than 1 %
  2.    1.5 %
  3.    2 %
  4.    4 %
 Discuss Question
Answer: Option A. -> Less than 1 %
Question 62. Size of a high speed motor as compared to low speed motor for the same H.P. will be
  1.    Bigger
  2.    Smaller
  3.    Same
  4.    Any of the above
 Discuss Question
Answer: Option B. -> Smaller
Question 63. The purpose of using short-circuit gear is
  1.    To short circuit the rotor at slip rings
  2.    To short circuit the starting resistances in the starter
  3.    To short circuit the stator phase of motor to form star
  4.    None of the above
 Discuss Question
Answer: Option A. -> To short circuit the rotor at slip rings
Question 64. Insertion of reactance in the rotor circuit
  1.    Reduces starting torque as well as maximum torque
  2.    Increases starting torque as well as maximum torque
  3.    Increases starting torque but maximum torque remains unchanged
  4.    Increases starting torque but maximum torque decreases
 Discuss Question
Answer: Option A. -> Reduces starting torque as well as maximum torque
Question 65. The maximum torque in an induction motor depends on
  1.    Frequency
  2.    Rotor inductive reactance
  3.    Square of supply voltage
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 66. The shaft of an induction motor is made of
  1.    High speed steel
  2.    Stainless steel
  3.    Carbon steel
  4.    Cast iron
 Discuss Question
Answer: Option C. -> Carbon steel
Question 67. The number of slip rings on a squirrel cage induction motor is usually
  1.    Two
  2.    Three
  3.    Four
  4.    None
 Discuss Question
Answer: Option D. -> None
Question 68. A squirrel cage induction motor is not selected when
  1.    Initial cost is the main consideration
  2.    Maintenance cost is to be kept low
  3.    Higher starting torque is the main consideration
  4.    All above considerations are involved
 Discuss Question
Answer: Option C. -> Higher starting torque is the main consideration
Question 69. Slip ring motor is recommended where
  1.    Speed control is required
  2.    Frequent starting, stopping and reversing is required
  3.    High starting torque is needed
  4.    All above features are required
 Discuss Question
Answer: Option D. -> All above features are required
Question 70. Lubricant used for ball bearing is usually
  1.    Graphite
  2.    Grease
  3.    Mineral oil
  4.    Molasses
 Discuss Question
Answer: Option B. -> Grease

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