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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

 DC compound.
 Induction motor.
  DC series.
 DC shunt.

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

 PZL/4Sp²
 PZL/4Sa²
 PZL/4S
 PZL/ 4Sa

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Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

 N12 : N22.
 none.
 N1 : N2.
 1 : 1.

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Electrical Machines
Damper winding is used to

 decrease the load current.
 both 1 and 2.
 increase the load current.
 suppress the hunting.

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

 Zero power factor.
  Leading power factor.
 Unity power factor.
 Lagging power factor.

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 8
 2
 1
 4

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