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Total Questions : 395 | Page 36 of 40 pages
Question 351. 0.  A rotory converter can be run as :
  1.    d.c. shunt motor
  2.    d.c. series motor
  3.    d.c. compound motor
  4.    synchronous motor
 Discuss Question
Answer: Option D. -> synchronous motor
Question 352. 9. The speed of a synchronous motor
  1.    increases as the load increases
  2.    decreases as the load decreases
  3.    always remains constant
  4.    none of the above
 Discuss Question
Answer: Option C. -> always remains constant
Question 353. 8. In which of the following motor 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 354. 7.  If the field circuit of an unloaded salientpole synchronous motor gets suddenly open-circuited, then
  1.    it runs at a slower speed
  2.    the motor stops
  3.    it continues to run at the same speed
  4.    it runs at a very high speed
 Discuss Question
Answer: Option B. -> the motor stops
Question 355. 2.  Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor?
  1.    Phase to phase winding resistance
  2.    Stator wnding to earthed frame
  3.    Rotor winding to earthed shaft
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 356. 1. The maximum speed variation in a 3-phase synchronous motor is
  1.    10 per cent
  2.    6 per cent
  3.    4 per cent
  4.    zero
 Discuss Question
Answer: Option D. -> zero
Question 357. 3. Due to which of the following reasons a synchronous motor fails to pull into synchronism after applying D.C. field current?
  1.    High field current
  2.    Low short cirucit ratio
  3.    High core losses
  4.    Low field current
 Discuss Question
Answer: Option D. -> Low field current
Question 358. 6. In a synchronous motor, damper windings are provided on
  1.    stator frame
  2.    rotor shaft
  3.    pole faces
  4.    none of the above
 Discuss Question
Answer: Option C. -> pole faces
Question 359. 7. The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as
  1.    pull-up torque
  2.    pull-in torque
  3.    pull-out torque
  4.    none of the above
 Discuss Question
Answer: Option B. -> pull-in torque
Question 360. 5. In a 3-phase synchronous motor, the negative phase sequence exists when the motor is
  1.    supplied with unbalanced voltage
  2.    under-loaded
  3.    over-loaded
  4.    none of the above
 Discuss Question
Answer: Option A. -> supplied with unbalanced voltage

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