☰ Induction Machines (Electrical Engineering) - MCQs

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Q13.

the phenomenon of crawling in a 3 phase induction motor may be due to

  • A. unbalanced supply voltage
  • B. 7th space harmonics of air gap field
  • C. 7th time harmonics of voltage wave
  • D. 5th space harmonics
    ✍ Discuss    
Q14.

the crawling in the induction motor is caused by

  • A. improper design of stator laminations
  • B. low voltage supply
  • C. high loads
  • D. harmonics devolved in motor
    ✍ Discuss    
Q15.

circle diagram of an induction motor can be used to determine its

  • A. power factor and efficiency
  • B. output and slip
  • C. all of the above
  • D. none of these
    ✍ Discuss    
Q16.

the power scale of circle diagram of an induction motor is determined from ______ test date only

  • A. open circuit
  • B. stator resistance
  • C. short circuit
  • D. slip
    ✍ Discuss    
Q17.

circle diagram is employed to determine the performance of a/an

  • A. synchronous motor
  • B. induction motor
  • C. DC motor
  • D. transformer
    ✍ Discuss    
Q18.

blocked rotor test of an induction motor corresponds, in case of a transformer, to

  • A. full load
  • B. half full load
  • C. no load
  • D. short circuit operation
    ✍ Discuss    
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