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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Ns
 S.Ns
 Nr
 Zero

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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Remain unaltered.
 Oscillate around the normal speed.
 Increase.
 Reduce.

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Electrical Machines
For a DC machine having P no of pole pairs Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for lap-winding ?

 PZL/ 4Sa
 PZL/4S
 PZL/4Sa²
 PZL/4SP²

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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

 15 HP.
  13 HP.
 14 HP.
  10 HP.

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Electrical Machines
A motor operates in stable region at which of the following slip?

 high slip region
 unity slip
 low slip region
 both 1 and 2

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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Fleming's right hand rule.
 Fleming's left hand rule.
 Ampere law.
 Lenz's law.

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