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Electrical Machines

Electrical Machines
Hunting phenomenon is observed in which motor?

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

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmin to Imax
 Vmax to Imin
 Vmax to Imax
 Vmin to Imin

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Ra minimum and Rf minimum
 Ra maximum and Rf minimum
 Ra maximum and Rf maximum
 Rf maximum and Ra minimum

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1820W
 2000W
 1450W
 1920W

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Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

 will become lagging
None of these
 will become leading
 will remain the same

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Electrical Machines
Hysteresis loop represents the area of

 total iron losses
 hysteresis loss
 eddy current loss
 copper loss

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MORE MCQ ON Electrical Machines

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