☰ Synchronous Machines (Electrical Engineering) - MCQs

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Q25.

variation in DC excitation of a synchronous motor causes variation in

  • A. speed of motor
  • B. power factor
  • C. armature current
  • D. both armature current and power factor
    ✍ Discuss    
Q26.

the speed of a synchronous motor can be varied by varying its

  • A. excitation
  • B. supply voltage
  • C. supply frequency
  • D. load
    ✍ Discuss    
Q27.

a smooth cylindrical synchronous motor will always stop when

  • A. excitation winding gets disconnected
  • B. load varies
  • C. supply voltage fluctuates
  • D. supply frequency varies
    ✍ Discuss    
Q28.

when does a synchronous motor operate with leading power factor current?

  • A. while it is under excited
  • B. while it is critically excited
  • C. while it is over excited
  • D. while it is heavily loaded
    ✍ Discuss    
Q29.

the value of load angle for a synchronous motor depends mainly upon its

  • A. excitation
  • B. load
  • C. speed
  • D. supply voltage
    ✍ Discuss    
Q30.

three phase synchronous motor needs DC supply for examination

  • A. continuously
  • B. at the starting instant only
  • C. of stator
  • D. none of these
    ✍ Discuss    
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