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Electrical Machines

Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 90°
 Greater than 90°
 0°
 less than 90°

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmax to Imin.
 Vmin to Imax.
 Vmin to Imin.
 Vmax to Imax.

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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
 They are not hard as copper brush
 They are self lubricating in nature
All of these

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 increase gradually and then stay at rated voltage
 decrease
 remain nearly constant
 increase to rated voltage and then may decrease

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Electrical Machines
A shaded pole single phase induction motor can be used for

 food mixers
 wet grinders
 personal computers as cooling fan
 tape recorders

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Electrical Machines
In DC machine yoke offers

 both A and B
 mechanical protection to the machine
 flux path completion
 produce working flux

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