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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1-S
 1/(1-S)
 1/S
 S

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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

 shaded, shaded
 unshaded, unshaded
 unshaded, shaded
 shaded, unshaded

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 zero watt
 30 W
 less than 30 W
 more than 30 W

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Hysteresis losses
 Both 1 and 2
 Eddy current losses
 Copper losses

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Electrical Machines
If the field circuit of a DC shunt motor is opened

 The armature current will reduce.
 The speed of motor will be reduced.
 DC Shunt Motor
  The motor will attain dangerously high speed.

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Electrical Machines
In DC machine yoke offers

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

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