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Electrical Machines

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 unity
 zero
 lagging
 leading

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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 self lubricating in nature
 They are not hard as copper brush

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 co- sinusoidal
 flat-topped
 rectangular
 sinusoidal

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Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

  45°C.
 27°C.
 35°C.
 32°C.

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 starting torque.
 speed regulation.
 running torque.
 efficiency.

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

 2 point starter
 3 point starter
 4 point starter
All of these

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