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Electrical Machines

Electrical Machines
Total core loss is also called as -------------?

 Eddy current loss
 Hysteresis loss
 Magnetic loss
 Copper loss

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 375 rpm
 3000 rpm
 1500 rpm
 75 rpm

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Electrical Machines
For a DC machine having P no of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for simple wave-winding ?

 PZL/4Sa²
 PZL/ 4Sa
 PZL/4S
 PZL/4Sp²

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Electrical Machines
The flux is maximum in the following part of a DC motor:

 under the interpole.
 pole core.
 under leading pole tip.
 under trailing pole tip.

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Slip ring induction motor.
 Squirrel cage induction motor.
None of these
 Same in both induction motors.

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Electrical Machines
Select the motor that should not be started on no load?

 Compound motor.
 Shunt motor.
  Series motor.
 Brushless DC motor.

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MORE MCQ ON Electrical Machines

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