| 1. | Which of the following motors would you select for vacuum cleaners ? | |
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Reluctance motor
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Universal motor
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Hysteresis motor
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Repulsion motor
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Report Question| 2. | The starting winding of a single-phase motor is placed in ? | |
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armature
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field
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rotor
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stator
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| 3. | In a hysteresis motor, the rotor ? | |
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has high hysteresis loss
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has high retentivity
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is made of chrome steel
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should have all of the above features
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| 4. | For ceiling fans generally the single phase motor used is ? | |
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capacitor-start type
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split-phase type
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permanent capacitor type
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capacitor start and run type
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| 5. | The capacitors used in single-phase capacitor motors have no ? | |
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voltage rating
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dielectric medium
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polarity marking
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definite value
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| 6. | Which of the following statements regarding single-phase induction motor is correct ? | |
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It requires only one winding
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It can rotate in one direction only
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It is self-starting
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It is not self-starting
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| 7. | A universal motor operates on ? | |
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synchronous speed with varying load
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constant load and varying speed
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approximately constant speed and load
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constant speed and varying load
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| 8. | If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in ? | |
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Damage to the starting winding
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damage to the centrifugal switch
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Overloading of running winding
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none of the above
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| 9. | A reluctance motor ? | |
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is self-starting
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is constant speed motor
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needs no D.C. excitation
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all of the above
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| 10. | Which motor is normally free from mechanical and magnetic vibrations ? | |
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Split phase motor
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Universal motor
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Hysteresis motor
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Shaded pole motor
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