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MCQs

Total Questions : 473 | Page 48 of 48 pages
Question 471. 3. In order to control the speed of a slip ring 3-phase induction motor through injected voltage in its rotor circuit, this voltage and the rotor voltage should essentially be
  1.    in same phase
  2.    in quadrature
  3.    in phase opposition
  4.    of same frequency
 Discuss Question
Answer: Option D. -> of same frequency
Question 472. 2.  The power input to an induction motor is 50kW when it is running at 4% slip. If the stator resistance and core losses are neglected, the rotor copper loss is equal to
  1.    38 kW
  2.    20 kW
  3.    4 kW
  4.    2 kW
 Discuss Question
Answer: Option C. -> 4 kW
Question 473. 1.  The following performance characteris tics are attributed to a 3-phase cage induction motor without skew : 1. lower magnetizing current compared to a slip ring motor.2. low efficiency.3. high pl.4. possible cogging and crawling. Which of these statements are correct?
  1.    1, 2 and 3
  2.    2, 3 and 4
  3.    1, 3 and 4
  4.    1, 2 and 4
 Discuss Question
Answer: Option D. -> 1, 2 and 4

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