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Electrical Machine Design (Electrical Engineering) - MCQs


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Q1.
under full load condition, the power factor of the rotor circuit of three phase induction motor is
  • A. about 0.2 lagging
  • B. about 0.5 lagging
  • C. almost unity
  • D. about 0.8 lagging

    Discuss    
Q2.
synchronous cusps ringtone speed control of 3 phase induction motor is due to
  • A. even harmonics
  • B. odd harmonics
  • C. both odd and even harmonics
  • D. none of the above

    Discuss    
Q3.
skewing of slots
  • A. improves heat transfer
  • B. reduce noise
  • C. suppresses the undesirable harmonics
  • D. none of the above

    Discuss    
Q4.
the number of stator slots should _________ be equal to the number of rotor slots
  • A. never
  • B. always
  • C. sometimes
  • D. none of these

    Discuss    
Q5.
air gap of of polyphase induction motor is kept small to
  • A. reduce the possibility of crawling
  • B. reduce the noise
  • C. reduce magnetizing current
  • D. obtain high starting torque

    Discuss    
Q6.
in an induction motor, leakage reactance is due to _________ leakage flux
  • A. slot
  • B. overhang
  • C. differential
  • D. all of these

    Discuss