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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

 magnetization
 cross magnetization
 demagnetization
All of these

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Electrical Machines
Which of these types of motor is used in elevators?

 DC shunt motor.
 None of these.
 DC compound motor.
 DC series motor.

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 closed winding
 wave winding
 open type winding
 lap winding

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = 2/P*θmech
 θelec = θmech
 θelec = 4/P*θmech
 θelec = P/2*θmech

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 3 - phase to ground fault.
 3 - phase fault.
  line to ground fault.
 line to line fault.

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.2 lead
 0.2 lag
 0.9 lag
 unity

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