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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 GNA
 MNA
 either GNA or MNA
None of these

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 1 V
 4 V
 2 V
 0 V

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Electrical Machines
Which of the following motor has more stability

None of these
 salient pole motor
 both motors has same stability
 cylindrical motor

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Electrical Machines
Hysteresis loss is proportional to

 f3.
  f.
 f2.
 f1.5.

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 windage and friction loss
 both 1 and 2
 Copper loss
 core loss only

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Electrical Machines
In synchronous generator V curve is drawn between

 either of these.
 field current on Y-axis and armature current on X-axis.
 field current on X-axis and armature current on Y-axis.
 field current on X-axis and power factor on Y-axis.

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