| 1. | The rotor of which motor does not have winding on it ? | |
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Repulsion motor
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Universal motor
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Reluctance motor
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Hysteresis motor
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Report Question| 2. | A single-phase capacitor-start motor will take starting current nearly ? | |
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four to six times the full load current
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three times the full load current
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twice the full load current
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same as full load current
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| 3. | Electrical faults in a motor occur most commonly in its ? | |
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motor winding
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commutator
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control equipment
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brushes
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| 4. | Which of the following statements about universal motor is incorrect ? | |
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Its direction of rotation can be reversed by reversing the polarity of its power supply
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It is designed for commercial frequency ranging from zero to 60 Hz
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It is usually built into the device it drives
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It is built in small size of upto about 0.5kW
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| 5. | A repulsion-start induction-run single phase motor runs as induction motor only when ? | |
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short-circuit is disconnected
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stator winding is reversed
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brushes are lifted to neutral plane
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commutator segments are short circuited
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| 6. | In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to ? | |
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improve power factor
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increase overload capacity
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reduce fluctuations in torque
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to improve torque
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| 7. | ln a shaded pole single-phase motor, the revolving field is produced by the use of ? | |
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inductor
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capacitor
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resistor
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shading coils
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| 8. | In a shaded pole motor, the shading coil usually consist of ? | |
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a single turn of heavy wire which is in parallel with running winding
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a single tum of heavy copper wire which is short-circuited and carries only induced current
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a multilayer fine gauge copper wire in parallel with running winding
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none of the above
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| 9. | Short-circuit is used in ? | |
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repulsion induction motor
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repulsion motor
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repulsion start induction run motor
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none of the above
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| 10. | In a capacitor start single-phase motor, when capacitor is replaced by a resistance ? | |
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torque will increase
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the motor will consume less power
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motor will run in reverse direction
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motor will continue to run in same direction
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