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MCQs

Total Questions : 233 | Page 2 of 24 pages
Question 11. Which of the following motors will operate at high power factor ?
  1.    Shaped pole motor
  2.    Split phase motor
  3.    Capacitor start motor
  4.    Capacitor run motor
 Discuss Question
Answer: Option D. -> Capacitor run motor
Question 12. Single phase induction motor usually operates on
  1.    0.6 power factor lagging
  2.    0.8 power factor lagging
  3.    0.8 power factor leading
  4.    unity power factor
 Discuss Question
Answer: Option A. -> 0.6 power factor lagging
Question 13. In a split phase motor, the running winding should have
  1.    high resistance and low inductance
  2.    low resistance and high inductance
  3.    high resistance as well as high inductance
  4.    low resistance as well as low inductiance
 Discuss Question
Answer: Option B. -> low resistance and high inductance
Question 14. If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in
  1.    Damage to the starting winding
  2.    Damage to the centrifugal switch
  3.    Overloading of running winding
  4.    None of the above
 Discuss Question
Answer: Option A. -> Damage to the starting winding
Question 15. A.C. series motor as compared to D.C. series motor has
  1.    smaller brush width
  2.    less number of field turns
  3.    more number of armature turns
  4.    less air gap
  5.    all of the above
 Discuss Question
Answer: Option E. -> all of the above
Question 16. If a D.C. series motor is operated on A.C. supply, it will
  1.    spark excessively
  2.    have poor efficiency
  3.    have poor power factor
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 17. In a capacitor start single-phase motor, when capacitor is replaced by a resistance
  1.    torque will increase
  2.    the motor will consume less power
  3.    motor will run in reverse direction
  4.    motor will continue to run in same direction
 Discuss Question
Answer: Option D. -> motor will continue to run in same direction
Question 18. A schrage motor can run on
  1.    zero slip
  2.    negative slip
  3.    positive slip
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 19. Which motor is normally free from mechanical and magnetic vibrations ?
  1.    Split phase motor
  2.    Universal motor
  3.    Hysteresis motor
  4.    Shaded pole motor
 Discuss Question
Answer: Option C. -> Hysteresis motor
Question 20. Speed torque characteristic of a repulsion induction motor is similar to that of a D.C.
  1.    shunt motor
  2.    series motor
  3.    compound motor
  4.    separately excited motor
 Discuss Question
Answer: Option C. -> compound motor

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