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MCQs

Total Questions : 233 | Page 5 of 24 pages
Question 41. Which of the following motor will have relatively higher power factor ?
  1.    Capacitor run motor
  2.    Shaded pole motor
  3.    Capacitor start motor
  4.    Split phase motor
 Discuss Question
Answer: Option A. -> Capacitor run motor
Question 42. In split-phase motor auxiliary winding is of
  1.    thick wire placed at the bottom of the slots
  2.    thick wire placed at the top of the slots
  3.    thin wire placed at the top of the slots
  4.    thin wire placed at the bottom of the slots
 Discuss Question
Answer: Option C. -> thin wire placed at the top of the slots
Question 43. In a capacitor start motor, the phase displacement between starting and running winding can be nearly
  1.    10°
  2.    30°
  3.    60°
  4.    90°
 Discuss Question
Answer: Option D. -> 90°
Question 44. In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to
  1.    improve power factor
  2.    increase overload capacity
  3.    reduce fluctuations in torque
  4.    to improve torque
 Discuss Question
Answer: Option A. -> improve power factor
Question 45. Which of the following single-phase induction motors is generally used in time phonographs?
  1.    Resistance start
  2.    Capacitor start capacitor run
  3.    Shaded pole
  4.    Universal
 Discuss Question
Answer: Option C. -> Shaded pole
Question 46. After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on
  1.    running winding
  2.    rotor winding
  3.    field winding
  4.    compensating winding
 Discuss Question
Answer: Option A. -> running winding
Question 47. The power factor of a single-phase induction motor is usually
  1.    lagging
  2.    always leading
  3.    unity
  4.    unity to 0.8 leading
 Discuss Question
Answer: Option A. -> lagging
Question 48. Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a
  1.    Magnetic relay
  2.    Thermal relay
  3.    Centrifugal switch
  4.    None of the above
 Discuss Question
Answer: Option A. -> Magnetic relay
Question 49. To reverse the direction of rotation of acapacitor start motor while it is running we should
  1.    disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding
  2.    disconnect motor from supply and immediately reconnect it to supply with reversed con-nections of the main winding
  3.    reverse the direction of connection of the auxiliary winding and after motor comes to rest then connect auxiliary winding to the supply
  4.    reverse the direction of connections of the auxiliary winding and immediately connect it to supply
 Discuss Question
Answer: Option A. -> disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding
Question 50. A universal motor is one which
  1.    can be operated either on D.C. or A.C. supply at approximately the same speed and output
  2.    can be marketed internationally
  3.    runs at dangerously high speed on no-load
  4.    none of the above
 Discuss Question
Answer: Option A. -> can be operated either on D.C. or A.C. supply at approximately the same speed and output

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