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MCQs

Total Questions : 395 | Page 3 of 40 pages
Question 21. A synchronous motor which works on a leading power factor and does not drive a mechanical load is called as
  1.    static condenser
  2.    condenser
  3.    synchronous condenser
  4.    none of the above
 Discuss Question
Answer: Option C. -> synchronous condenser
Question 22. For V-curves for a synchronous motor the graph is drawn between
  1.    field current and armature current
  2.    terminal voltage and load factor
  3.    power factor and field current
  4.    armature current and power factor
 Discuss Question
Answer: Option A. -> field current and armature current
Question 23. The armature current of the synchronous motor has higher values for
  1.    high excitation only
  2.    low excitation only
  3.    both (A) and (B)
  4.    none of the above
 Discuss Question
Answer: Option C. -> both (A) and (B)
Question 24. In which of the following motors the stator and rotor fields rotate simultaneously ?
  1.    D.C. motor
  2.    Reluctance motor
  3.    Universal motor
  4.    Synchronous motor
 Discuss Question
Answer: Option D. -> Synchronous motor
Question 25. A rotory converter can also be run as a
  1.    d.c. shunt motor
  2.    d.c. series motor
  3.    d.c. compound motor
  4.    induction motor
  5.    synchronous motor
 Discuss Question
Answer: Option E. -> synchronous motor
Question 26. The oscillations in a synchronous motor can be damped out by
  1.    maintaining constant excitation
  2.    running the motor on leading power factors
  3.    providing damper bars in the rotor pole faces
  4.    oscillations cannot be damped
 Discuss Question
Answer: Option C. -> providing damper bars in the rotor pole faces
Question 27. A synchronous motor can be used as a synchronous capacitor when it is
  1.    under-loaded
  2.    over-loaded
  3.    under-excited
  4.    over-excited
 Discuss Question
Answer: Option D. -> over-excited
Question 28. Slip-rings in a synchronous motor carry
  1.    direct current
  2.    alternating current
  3.    no current
  4.    all of the above
 Discuss Question
Answer: Option A. -> direct current
Question 29. An over-excited synchronous motor takes
  1.    leading current
  2.    lagging current
  3.    both (A) and (B)
  4.    none of the above
 Discuss Question
Answer: Option A. -> leading current
Question 30. While starting a synchronous motor by induction motor action, field winding is usually
  1.    connected to D.C. supply
  2.    short-circuited by low resistance
  3.    kept open-circuited
  4.    none of the above
 Discuss Question
Answer: Option B. -> short-circuited by low resistance

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