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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  EIa.
  none of these.
  EbIa2.
  EbIa.

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Electrical Machines
What are slot wedges in a DC machine made of?

 Fibre.
 Silicon steel.
 Cast iron.
 Mild steel.

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Electrical Machines
Which of the following statements is/are correct ?

 Compensating winding will act under the pole.
 Both A and B.
 Inter pole winding will act in interpolar region.
None of these

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Electrical Machines
If the excitation is reduced, the power factor is

 leading power factor
None of these
 lagging power factor
 unity power factor

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

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

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start capacitor run motor
All of these
 Resistance split phase motor
 Capacitor start motor

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