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MCQs

Total Questions : 395 | Page 37 of 40 pages
Question 361. 8. A synchronous machine with low value of short-circuit ratio has
  1.    lower stability limit
  2.    high stability limit
  3.    good speed regulation
  4.    good voltage regulation
 Discuss Question
Answer: Option A. -> lower stability limit
Question 362. 4. In a synchronous motor, the maximum power developed depends on all of the following except
  1.    rotor excitation
  2.    maximum value of coupling angle
  3.    direction of rotating
  4.    supply voltage
 Discuss Question
Answer: Option C. -> direction of rotating
Question 363. 9. Exciters of synchronous machines are
  1.    d.c. shunt machines
  2.    d.c. series machines
  3.    d.c. compound machines
  4.    any of the above
 Discuss Question
Answer: Option A. -> d.c. shunt machines
Question 364. 0. The maximum power developed in a synchronous motor will depend on
  1.    the rotor excitation only
  2.    the supply voltage only
  3.    the rotor excitation and supply voltage both
  4.    the rotor excitation, supply' voltage and maximum value of coupling angle
 Discuss Question
Answer: Option D. -> the rotor excitation, supply' voltage and maximum value of coupling angle
Question 365. 4.  During hunting of synchronous motor
  1.    negative phase sequence currents are generated
  2.    harmonics are developed in the armature circuit
  3.    damper bar develops torque
  4.    field excitation increases
 Discuss Question
Answer: Option C. -> damper bar develops torque
Question 366. 2.  A synchronous motor develops maximum power when load agle is
  1.    450?
  2.    60?
  3.    900
  4.    120?
 Discuss Question
Answer: Option C. -> 900
Question 367. 3.  A cylindrical rotor synchronous motor is switched on the supply with its field windings shorted on themselves. It will
  1.    not start
  2.    start but not run at synchronous speed
  3.    start as an induction motor and then run as synchronous motor
  4.    start and run as a synchronous motor
 Discuss Question
Answer: Option B. -> start but not run at synchronous speed
Question 368. 1. 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 369. 5.  A salient pole synchronous motor is running with normal excitation. If the excitation is reduced to zero
  1.    it becomes an induction motor
  2.    it becomes a reluctance motor
  3.    it remains a synchronous motor
  4.    the motor would stop
 Discuss Question
Answer: Option B. -> it becomes a reluctance motor
Question 370. 6. Which of the following will change in a three-phase synchronous motor, as a consequence of excitation variations? 1. Pull-out torque2. Torque angle3. Magnitude and power factor of stator current4. Output power Select the correct answer using the codes given below :Codes :
  1.    1 and 3
  2.    2 and 4
  3.    2, 3 and 4
  4.    1, 2 and 3
 Discuss Question
Answer: Option B. -> 2 and 4

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