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Electrical Machines

Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 6
 1
 2
 4

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 5 Hz
 50 Hz
 0 Hz
 1 Hz

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

 DC shunt motor.
  DC series motor.
  DC series generator.
 DC shunt generator.

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

 In order to get saturated.
All of these
 In order to not to get saturated.
 In order to get more flux.

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Electrical Machines
In DC machines shape of net flux density is?

 peaky in nature
 sine wave
 saddle shape
 flat tapped or trapezoidal

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Electrical Machines
In case of a conductively compensated DC series motor, the compensating winding is provided

 In parallel with the armature winding.
  In series with the armature winding.
 In parallel with the field winding.
 As a separate unit.

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