| 1. | Lap winding is preferred for ? | |
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low current and low voltage
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high current and high voltage
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high current and low voltage
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low current and high voltage
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View Answer
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Report Question| 2. | Scott connections are used for ? | |
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single phase to three phase transformation
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three phase to single phase transformation
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three phase to two phase transformation
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any of the above
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| 3. | The primary and secondary windings of an Auto transformer are ? | |
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magnetically coupled
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electrically coupled
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both magnetically and electrically coupled
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None of these
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| 4. | A 40KVA transformer has a core loss of 450 W and total loss of 800 W. Find the copper loss for Maximum efficiency ? | |
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350 W
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800 W
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450 W
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None of these
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| 5. | The difference between the stator synchronous speed and rotor speeds is called ? | |
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leading speed
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lagging speed
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slip speed
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slow speed
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| 6. | In three induction motor maximum torque is inversely proportional to the ? | |
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stator voltage
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speed of rotor
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rotor reactance
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decreasing slip speed
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| 7. | A hysteresis motor ? | |
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is not a self-starting motor
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is a constant speed motor
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needs dc excitation
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can not be run in reverse speed
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| 8. | In a hysteresis motor, the rotor must have ? | |
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retentivity
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resistivity
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susceptibility
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None of these
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| 9. | In a split phase motor ? | |
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the starting winding is connected through a centrifugal switch
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the running winding is connected through a centrifugal switch
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both starting and running windings are connected through a centrifugal switch
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centrifugal switch is used to control supply voltage
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| 10. | Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a ? | |
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magnetic relay
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thermal relay
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centrifugal switch
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None of these
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