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Electrical Machines

Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 20V
 100V
 10V
 200V

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Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 minimum
All of these
 zero
 maximum

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 6 / 7.
  4 / 5.
 2 / 3.
 5 / 6.

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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
On what factors the speed of dc motor depends?

 Field flux.
 Armature current Ia.
 All of these.
 Applied voltage.

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Electrical Machines
Which type of motors uses slip rings?

 Induction motors
 Both Synchronous and Induction motor
 Synchronous motors
 DC Shunt Motor

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