| 1. | The ratio of starting torque to full load torque is least in case of ? | |
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series motor
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shunt motors
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compound motors
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none of the above
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Report Question| 2. | In a D.C. series motor if the armature current is reduced by 50%, the torque of the motor will be equal to ? | |
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100% of the previous value
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50% of the previous value
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25% of the previous value
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10% of the previous value
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| 3. | In case of conductively compensated DC series motors, the compensating winding is provided ? | |
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as separately wound unit
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in parallel with armature winding
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in series with armature winding
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in parallel with field winding
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| 4. | As compared to an induction motor, the air gap in a D.C. motor is ? | |
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less than 50%
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between 50% and 90%
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same
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more
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| 5. | Which of the following motor has the poorest speed regulation ? | |
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Shunt motor
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Series motor
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Differential compound motor
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Cumulative compound motor
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| 6. | For a D.C. shunt motor if the excitation is changed ? | |
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torque will remain constant
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torque will change but power will remain constant
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torque and power both will change
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torque, power and speed, all will change
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| 7. | Which of the following motors have almost constant speed over their full load range ? | |
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AC. series motors
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Low resistance squirrel cage motors
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D.C. shunt motors
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Both (b) and (c)
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