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MCQs

Total Questions : 233 | Page 6 of 24 pages
Question 51. In a shaded pole motor, the shading coil usually consist of
  1.    a single turn of heavy wire which is in parallel with running winding
  2.    a single turn of heavy copper wire which is short-circuited and carries only induced current
  3.    a multilayer fine gauge copper wire in parallel with running winding
  4.    none of the above
 Discuss Question
Answer: Option B. -> a single turn of heavy copper wire which is short-circuited and carries only induced current
Question 52. The shaded pole motor is used for
  1.    high starting torque
  2.    low starting torque
  3.    medium starting torque
  4.    very high starting torque
 Discuss Question
Answer: Option B. -> low starting torque
Question 53. When a D.C. series motor is connected to A.C. supply, the power factor will be low because of
  1.    high inductance of field and armature circuits
  2.    induced current in rotor due to variations of flux
  3.    fine copper wire winding
  4.    none of the above
 Discuss Question
Answer: Option A. -> high inductance of field and armature circuits
Question 54. The motor used on small lathes is usually
  1.    universal motor
  2.    D.C. shunt motor
  3.    single-phase capacitor run motor
  4.    3-phase synchronous motor
 Discuss Question
Answer: Option C. -> single-phase capacitor run motor
Question 55. The speed of a universal motor is generally reduced by using
  1.    gear trains
  2.    V-belts
  3.    brakes
  4.    chains
 Discuss Question
Answer: Option A. -> gear trains
Question 56. The speed of a universal motor is usually reduced by using
  1.    gearing
  2.    belts
  3.    brakes
  4.    chains
 Discuss Question
Answer: Option A. -> gearing
Question 57. The rotor developed by a single-phase motor at starting is
  1.    more than rated torque
  2.    rated torque
  3.    less than the rated torque
  4.    zero
 Discuss Question
Answer: Option D. -> zero
Question 58. Speed control of a universal motor is achieved by
  1.    Varying field flux with tapped field windings
  2.    Connecting rheostat in series
  3.    Applying variable voltage by means of silicon controlled rectifier
  4.    All of the above methods
 Discuss Question
Answer: Option D. -> All of the above methods
Question 59. Torque developed by a single phase induction motor at starting is
  1.    pulsating
  2.    uniform
  3.    none of the above
  4.    nil
 Discuss Question
Answer: Option D. -> nil
Question 60. Which of the following statements regarding two value capacitor motor is incorrect ?
  1.    It is a reversing motor
  2.    It is preferred to permanent-split single-value capacitor motor where frequent reversals are required
  3.    It has low starting as well as rushing currents
  4.    It has high starting torque
 Discuss Question
Answer: Option B. -> It is preferred to permanent-split single-value capacitor motor where frequent reversals are required

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