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MCQs

Total Questions : 233 | Page 9 of 24 pages
Question 81. A shaded pole motor can be used for
  1.    toys
  2.    hair dryers
  3.    circulators
  4.    any of the above
 Discuss Question
Answer: Option D. -> any of the above
Question 82. Hysteresis motor is particularly useful for high-quality record players and tape-recorders because
  1.    it revolves synchronously
  2.    it is not subject to any magnetic or mechanical vibrations
  3.    it can be easily manufactured in extremely small sizes of up to 1 W output
  4.    it develops hysteresis torque which is extremely steady both in amplitude and phase
 Discuss Question
Answer: Option D. -> it develops hysteresis torque which is extremely steady both in amplitude and phase
Question 83. The speed/load characteristics of a universal motor is same as that of
  1.    D.C. motor
  2.    D.C. shunt motor
  3.    D.C. series motor
  4.    none of the above
 Discuss Question
Answer: Option C. -> D.C. series motor
Question 84. If the capacitor of a single-phase motor is short-circuited
  1.    the motor will not start
  2.    the motor will run
  3.    the motor will run in reverse direction
  4.    the motor will run in the same direction at reduced r.p.m.
 Discuss Question
Answer: Option A. -> the motor will not start
Question 85. The repulsion start induction run motor is used because of
  1.    good power factor
  2.    high efficiency
  3.    minimum cost
  4.    high starting torque
 Discuss Question
Answer: Option D. -> high starting torque
Question 86. In split phase motor main winding is of
  1.    thin wire placed at the top of the slots
  2.    thin wire placed at the bottom of the slots
  3.    thick wire placed at the bottom of the slots
  4.    thick wire placed at the top of the? slots
 Discuss Question
Answer: Option C. -> thick wire placed at the bottom of the slots
Question 87. Most of the fractional horsepower motors have either
  1.    hard and annealed bearings
  2.    ball or roller bearings
  3.    soft and porous bearings
  4.    plain or sleeve bearings
 Discuss Question
Answer: Option D. -> plain or sleeve bearings
Question 88. The motor used for the compressors is
  1.    d.c. series motor
  2.    shaded pole motor
  3.    capacitor-start capacitor-run motor
  4.    reluctance motor
 Discuss Question
Answer: Option C. -> capacitor-start capacitor-run motor
Question 89. If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then
  1.    motor will not come up to speed
  2.    motor will not carry the load
  3.    current drawn by the motor will be excessively high
  4.    electrolytic capacitor will, in all probability, suffer break down
 Discuss Question
Answer: Option D. -> electrolytic capacitor will, in all probability, suffer break down
Question 90. If a particular application needs high speed and high starting torque, then which of the following motor will bepreferred ?
  1.    Universal motor
  2.    Shaded pole type motor
  3.    Capacitor start motor
  4.    Capacitor start and run motor
 Discuss Question
Answer: Option A. -> Universal motor

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