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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 1 Hz
 2.5Hz
 2HZ
 50Hz

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Electrical Machines
Ideal value of voltage regulation of a device is?

 ∞
 a finite negative value
 a positive finite value
 0

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 750 rpm
 3000 rpm
 1500 rpm
 1000 rpm

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.04
 0.02
 0.4
 0.2

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Electrical Machines
In a 12 pole triplex lap wound DC armature, each conductor can carry current of 100 A. The rated current of this armature is

  3600 A.
 1200 A.
 600 A.
 2400 A.

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

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

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