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Electrical Machines

Electrical Machines
Hunting phenomenon is observed in which motor?

 Induction motor.
  Synchronous motor.
 Both A and C.
 DC motor.

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Electrical Machines
Which type motors are preferred for lathes?

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

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Electrical Machines
The speed regulation of a DC motor is given as

 NnL − NfL.
 (NfL − NnL)/NnL.
 (NnL − NfL)/NfL.
 NnL/NfL.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

 B - C - A or C - A - B.
  A - C - B.
 C - A - B.
 B - C - A.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 Decrease.d
 remains same.
 increase.
 none of these.

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Electrical Machines
Hysteresis loop represents the area of

 total iron losses
 eddy current loss
 copper loss
 hysteresis loss

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