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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

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

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 RBY
All of these
 BYR
 BRY

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

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

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Electrical Machines
Swinburne's test is applicable to

 DC Shunt motor.
 DC series motor.
 DC shunt and level Compound motor.
 DC compound motor.

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 1.1.
  0.05.
  0.905.
 20.

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 133.22 N-m
 can not be determined.
 234.76 N-m.
 266.20 N-m.

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