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Electrical Machines

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

  none of these.
  EbIa2.
  EbIa.
  EIa.

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

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

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Electrical Machines
An unexcited single phase synchronous motor is

 repulsion motor.
  universal motor.
 AC series motor.
 reluctance motor.

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Electrical Machines
The armature shaft must be able to with stand

 Twisting stains due to transmission of torque.
 Any unbalanced magnetic pull on the armature core.
 Bending moment due to weight of the armature.
All of these

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the starting current will be enormously high.
 the motor may run away.
 the starting torque becomes low.
 the motor may not start.

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Electrical Machines
Which of the following is/are the advantages of carbon brush over the copper brush?

 In case of any sparking they will be less damaged than copper brushes
All of these
 They are self lubricating in nature
 They are not hard as copper brush

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