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Electrical Machines

Electrical Machines
Equalizer rings are used in which of the followings?

 both 1 and 2
None of these
 lap winding
 wave winding

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 rough commutator surface.
 any of above.
 severe sparking.
 imperfect contact.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 1/Ia
 Ia2
 I/Ia2
 Ia

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Electrical Machines
Which of the following induction motor has maximum speed?

 6 pole.
 4 pole.
  2 pole.
 8 pole.

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Electrical Machines
Transformer cooling and insulating oil must be of

 high viscosity.
 low BDV.
 low resistivity.
  low viscosity.

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

 I1 = KI2 + Iμ.
  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2.
 I1 = KI2 + Iw.

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