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Electrical Machines

Electrical Machines
At stand still condition the value of slip is

 1
 infinite value
 0
 finite value

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Electrical Machines
Which of the following motor has the highest power factor at full load?

 Capacitor start
 Resistance split phase
 Shaded pole
 Capacitor run

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Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?

  Ball bearings.
None of these
  Cast iron bearings.
  Bush bearings.

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

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 both of above.
 DC.
 AC.
None of these

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Electrical Machines
Iron loss in a transformer mainly occurs in

 iron made tank of transformer.
 transformer insulating oil.
 winding of transformer.
 steel core in transformer.

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