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Electrical Machines

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

 demagnetization
 magnetization
All of these
 cross magnetization

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Electrical Machines
The type of DC motor used for shears and punches is

  Cummulative compound motor.
 Series motor.
 Shunt motor.
 Differential compound motor.

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

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

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Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 either GNA or MNA
 MNA
None of these
 GNA

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 reduced starting current.
 more starting torque.
 more starting time.
 smoother acceleration.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 460 A.
 570 A.
 340 A.
 250 A.

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