online mcq EE-Single Phase Motors Part three

Instructions: Click the answer button to see the correct answer.

  1. In case of single phase motors, pulsating flux is set up instead of revolving field as in 3-phase motors.
    1. true
    2. false

    Answera

  2. In split-phase induction motors, two windings are provided.
    1. true
    2. In case of single phase motors, pulsating flux is set up instead of revolving field as in 3-phase motors.
    3. false

    Answerb

  3. In split-phase induction motors, two windings arc connected in parallel.
    1. true
    2. false

    Answera

  4. In split-phase induction motor, both the windings arc connected during starling.
    1. false
    2. true

    Answera

  5. A shaded pole motor has laminated salient poles.
    1. true
    2. false

    Answera

  6. In shaded pole motors, the winding is provided on poles.
    1. false
    2. true

    Answerb

  7. A universal motor can be operated on single phase or three phase supply.
    1. true
    2. false

    Answerb

  8. Normally the direction of rotation of a shaded pole motor cannot be reversed.
    1. false
    2. true

    Answerb

  9. The starting torque of a single phase motor can be improved by connecting a capacitor in series with the starting winding.
    1. true
    2. false

    Answera

  10. In capacitor motors paper capacitor is used.
    1. true
    2. false

    Answera

  11. Shaded pole type motor has leading power factor.
    1. false
    2. true

    Answera

  12. The electrical connection between stator and rotor is through a condenser.
    1. true
    2. false

    Answera

  13. Starting winding is provided on single phase motor to make it self-starting.
    1. true
    2. false

    Answera

  14. In a capacitor motor the capacitance helps in splitting single phase into two phase supply.
    1. true
    2. false

    Answera

  15. A shaded pole motor is the only single phase motor which is inherently self-starting.
    1. false
    2. true

    Answerb

  16. In a mixer-grinder, universal motor is used.
    1. false
    2. true

    Answerb

  17. The principle of operation of a single phase induction motor depends upon rotating magnetic fields.
    1. false
    2. true

    Answerb

  18. A repulsion motor is fitted with a commutator.
    1. false
    2. true

    Answerb

  19. A repulsion motor receives its armature current by induction.
    1. false
    2. true

    Answerb

  20. A repulsion motor can be directly switched on line.
    1. true
    2. false

    Answera

  21. The rotor of a hysteresis motor is made of cast iron.
    1. true
    2. false

    Answerb

  22. The disadvantage of hysteresis motor is sparking at brushes.
    1. true
    2. false

    Answera

  23. A single phase motor may become hot due to high voltage, short circuit or over-load.
    1. true
    2. false

    Answera

  24. A hysteresis motor works on the principle of continuously revolving magnetic flux.
    1. false
    2. true

    Answerb

  25. A single phase capacitor start and ran motor is virtually a two phase induction motor.
    1. false
    2. true

    Answerb

  26. A universal motor when operated on dc or ac supply at same speed produces different outputs.
    1. true
    2. false

    Answerb

  27. In repulsion motors the power factor is high.
    1. true
    2. false

    Answerb

  28. A short circuit is used in repulsion start induction run motor.
    1. false
    2. true

    Answerb

  29. A shaded pole motor has low initial cost.
    1. false
    2. true

    Answerb

  30. Universal motors are invariably fitted with a cooling fan.
    1. false
    2. true

    Answerb

  31. Large universal motors are usually directly coupled to load.
    1. true
    2. false

    Answera

  32. Single
    turn coil is used in the armature of single phase ac series motors to
    facilitate commutation and avoid sparking at the brushes.
    1. false
    2. true

    Answerb

  33. In conductively compensated ac series motor the compensating winding is connected in parallel with the armature.
    1. false
    2. true

    Answera

  34. The resultant flux of a two phase induction motor is constant.
    1. true
    2. false

    Answera

  35. In repulsion motors the speed is a function of load.
    1. true
    2. false

    Answera

  36. For domestic applications single phase motors are preferred.
    1. false
    2. true

    Answerb

  37. For cleaning motor winding it should be washed with water and soap solution.
    1. false
    2. true

    Answera

  38. In reluctance motor the torque is produced due to hysteresis loss.
    1. false
    2. true

    Answerb

  39. In inductively compensated ac series motor, the current is proportional to armature current at a phase angle of 90°.
    1. false
    2. true

    Answera

  40. In repulsion motors, no load speed is dangerously high.
    1. fals
    2. true

    Answerb

Copyright (C) 2016 by Single Phase Motors Part Three (ALL EXAM REVIEW ADDA)

online mcq EE-Single Phase Motors Part four
Online MCQ EE-Circuit Breakers Part Four

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