| 1. | Torque developed by a single phase induction motor at starting is ? | |
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pulsating
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uniform
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none of the above
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nil
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Report Question| 2. | Which of the following statements regarding reluctance-start motor is incorrect ? | |
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It is similar to reluctance motor
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It is basically an induction motor and not a synchronous one
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So far as its basic working principle is concerned, it is similar to shaded pole motor
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the air-gap between rotor and salient poles is non- uniform
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| 3. | Which of the following statements regarding repulsion-start induction motor is incorrect ? | |
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It requires more maintenance of commutator and other mechanical devices
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It makes quite a bit of noise on starting
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fractional horse power motors, it has replaced the capacitor motors
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It is not easily reversed
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| 4. | The speed of a universal motor is usually reduced by using ? | |
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gearing
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belts
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brakes
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chains
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| 5. | Which motor is relatively free from mechanical and magnetic vibrations ? | |
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Shaded-pole motor
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Universal motor
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Reluctance motor
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Hysteresis motor
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| 6. | If the ceiling fan, when switched on, runs at slow speed in the reverse direction, it can be concluded that ? | |
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capacitor is ineffective
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winding has burnt out
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bearings are worn out
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none of the above
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| 7. | Which statement about resistance start split-phase motor is incorrect ? | |
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It is non-reversible
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The main winding has low resistance but high reactance
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It has two stator windings called main and starting windings
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The two stator windings are connected in series across the supply
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| 8. | Which of the following applications always have some load whenever switched on ? | |
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Vacuum cleaners
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Fan motors
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Pistol drills
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All of the above
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| 9. | The speed of a universal motor is usually reduced by using ? | |
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gearing
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belts
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brakes
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chains
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| 10. | Which statement about resistance start split-phase motor is incorrect ? | |
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It is non-reversible
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The main winding has low resistance but high reactance
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It has two stator windings called main and starting windings
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The two stator windings are connected in series across the supply
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