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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 25° to 30°
 70° to 85°
 0°
 90°

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 percentage impedances are equal
 turn- ratios are exactly equal
 KVA ratings are equal
 polarities are properly connected

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Electrical Machines
For which of the following loads, armature reaction is magnetizing in nature?

None of these
 pure resistive load
 pure inductive load
 pure capacitive load

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Electrical Machines
Damper winding is used to

 increase the load current.
 suppress the hunting.
 both 1 and 2.
 decrease the load current.

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Electrical Machines
DC Shunt Motor has disadvantage(s) of

 none of above.
 constant speed.
 less expensive.
 not suitable for rapidly changing loads.

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Electrical Machines
Which type motors are preferred for lathes?

 Either A or B.
 DC shunt motors.
 Synchronous motor.
 Squirrel Cage induction motor.

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