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MCQs

Total Questions : 233 | Page 23 of 24 pages
Question 221. If starting winding of a single-phase induction motor is left in the circuit, it will
  1.    run slower
  2.    spark at light loads
  3.    draw excessive current and overheat
  4.    run faster
 Discuss Question
Answer: Option C. -> draw excessive current and overheat
Question 222. Which of the following motors has highest starting torque ?
  1.    Repulsion motor
  2.    Shaped pole motor
  3.    Split-phase motor
  4.    Capacitor-start motor
 Discuss Question
Answer: Option D. -> Capacitor-start motor
Question 223. A capacitor-start single phase induction motor is switched on to supply with its capa-citor replaced by an inductor of equivalent reactance value. It will
  1.    start and then stop
  2.    start and run at rated speed
  3.    not start at all
  4.    start and run slowly
 Discuss Question
Answer: Option C. -> not start at all
Question 224. The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it
  1.    improves the power factor
  2.    helps the rotor teeth to remain under the stator teeth
  3.    helps in reducing the tendency of the rotor teeth to remain under the stator teeth
  4.    improves the efficiency
 Discuss Question
Answer: Option C. -> helps in reducing the tendency of the rotor teeth to remain under the stator teeth
Question 225. A repulsion motor is equipped with
  1.    commutator
  2.    slip rings
  3.    None of these
  4.    both (A) and (B)
 Discuss Question
Answer: Option A. -> commutator
Question 226. In case of a shaded pole motor the direction of rotation of the motor is
  1.    from shaded pole to main pole
  2.    either of the above depending on voltage
  3.    either of the above depending on power factor
  4.    from main pole to shaded pole
 Discuss Question
Answer: Option D. -> from main pole to shaded pole
Question 227. The direction of rotation of an hysteresis motor is determined by
  1.    retentivity of the rotor material
  2.    interchanging the supply leads
  3.    position of shaded pole with respect to main pole
  4.    none of these
 Discuss Question
Answer: Option C. -> position of shaded pole with respect to main pole
Question 228. A shaded pole motor does not possess
  1.    all of these
  2.    commutator
  3.    capacitor
  4.    centrifugal switch
 Discuss Question
Answer: Option A. -> all of these
Question 229. In repulsion motor, maximum torque is developed when
  1.    None of these
  2.    brush axis is at 90° electrical to the field axis
  3.    brush axis is at 45° electrical to the field axis
  4.    brush axis coincides with the field axis
 Discuss Question
Answer: Option C. -> brush axis is at 45° electrical to the field axis
Question 230. Which of the following motors can be used for unity power factor ?
  1.    Capacitor run motor
  2.    Shaded pole motor
  3.    Schrage motor
  4.    Hysteresis motor
 Discuss Question
Answer: Option C. -> Schrage motor

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