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Electrical Engineering

Single Phase Induction Motors MCQs

Practice Single Phase Induction Motors MCQs for competitive exams.

Single Phase Induction Motors MCQs

Practice questions from this topic.

The wattage rating for a ceiling fan motor will be in the range

  1. A. 200 to 250 W
  2. B. 250 to 500 W
  3. C. 50 to 150 W
  4. D. 10 to 20 W
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The direction of rotation of universal motor can be reversed the by reversing the flow of current through

  1. A. Armature winding
  2. B. Field winding
  3. C. Either armature winding or field winding
  4. D. None of the above
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Which of the following motors is used for unity power factor ?

  1. A. Hysteresis motor
  2. B. Schrage motor
  3. C. Universal motor
  4. D. Reluctance motor
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Which of the following motors can be used for unity power factor ?

  1. A. Capacitor run motor
  2. B. Shaded pole motor
  3. C. Hysteresis motor
  4. D. Schrage motor
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In repulsion motor, zero torque is developed when

  1. A. brush axis is 45° electrical to field axis
  2. B. brush axis coincides with the field axis
  3. C. brush axis is 90° electrical to field axis
  4. D. both (B) and (C)
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In repulsion motor, maximum torque is developed when

  1. A. brush axis is at 45° electrical to the field axis
  2. B. brush axis coincides with the field axis
  3. C. brush axis is at 90° electrical to the field axis
  4. D. none of the above
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A repulsion motor is equipped with

  1. A. slip rings
  2. B. commutator
  3. C. both (A) and (B) D. none of the above
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The direction of rotation of an hysteresis motor is determined by

  1. A. interchanging the supply leads
  2. B. position of shaded pole with respect to main pole
  3. C. retentivity of the rotor material
  4. D. none of these
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A shaded pole motor does not possess

  1. A. centrifugal switch
  2. B. capacitor
  3. C. commutator
  4. D. all of the above
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In case of a shaded pole motor the direction of rotation of the motor is

  1. A. from main pole to shaded pole
  2. B. from shaded pole to main pole
  3. C. either of the above depending on voltage
  4. D. either of the above depending on power factor
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The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it

  1. A. improves the efficiency
  2. B. helps the rotor teeth to remain under the stator teeth
  3. C. helps in reducing the tendency of the rotor teeth to remain under the stator teeth
  4. D. improves the power factor
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If starting winding of a single-phase induction motor is left in the circuit, it will

  1. A. run faster
  2. B. spark at light loads
  3. C. draw excessive current and overheat
  4. D. run slower
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