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MCQs

Total Questions : 473 | Page 8 of 48 pages
Question 71. If a 3-phase supply is given to the stator and rotor is short circuited rotor will move
  1.    In the opposite direction as the direction of the rotating field
  2.    In the same direction as the direction of the field
  3.    In any direction depending upon phase sequence of supply
  4.    None of these
 Discuss Question
Answer: Option B. -> In the same direction as the direction of the field
Question 72. For which motor the speed can be controlled from rotor side?
  1.    Squirrel-cage induction motor
  2.    Slip-ring induction motor
  3.    Both (A) and (B)
  4.    None of the above
 Discuss Question
Answer: Option B. -> Slip-ring induction motor
Question 73. 5 H.P., 50Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest?
  1.    730 r.p.m.
  2.    960 r.p.m.
  3.    1440 r.p.m.
  4.    2880 r.p.m.
 Discuss Question
Answer: Option A. -> 730 r.p.m.
Question 74. In the squirrel-cage induction motor the rotor slots are usually given slight skew
  1.    To reduce the magnetic hum and locking tendency of the rotor
  2.    To increase the tensile strength of the rotor bars
  3.    To ensure easy fabrication
  4.    None of the above
 Discuss Question
Answer: Option A. -> To reduce the magnetic hum and locking tendency of the rotor
Question 75. In case of the induction motors the torque is
  1.    Inversely proportional to (V-slip)
  2.    Directly proportional to (slip)2
  3.    Inversely proportional to slip
  4.    Directly proportional to slip
 Discuss Question
Answer: Option D. -> Directly proportional to slip
Question 76. Temperature of the stator winding of a three phase induction motor is obtained by
  1.    Resistance rise method
  2.    Thermometer method
  3.    Embedded temperature method
  4.    All above methods
 Discuss Question
Answer: Option D. -> All above methods
Question 77. An induction motor is
  1.    Self-starting with zero torque
  2.    Self-starting with high torque
  3.    Self-starting with low torque
  4.    Non-self starting
 Discuss Question
Answer: Option C. -> Self-starting with low torque
Question 78. The torque of an induction motor is
  1.    Directly proportional to slip
  2.    Inversely proportional to slip
  3.    Proportional to the square of the slip
  4.    None of the above
 Discuss Question
Answer: Option A. -> Directly proportional to slip
Question 79. The crawling in the induction motor is caused by
  1.    Low voltage supply
  2.    High loads
  3.    Harmonics developed in the motor
  4.    Improper design of the machine
 Discuss Question
Answer: Option C. -> Harmonics developed in the motor
Question 80. The 'crawling' in an induction motor is caused by
  1.    High loads
  2.    Low voltage supply
  3.    Improper design of machine
  4.    Harmonics developed in the motor
 Discuss Question
Answer: Option D. -> Harmonics developed in the motor

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