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Electrical Machines

Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sinδ
 cos2δ
 cosδ
 sin2δ

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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/4Sa²
 PZL/4SP²
 PZL/ 4Sa
 PZL/4S

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

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

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Electrical Machines
An induction motor is, in general analogous to

 two winding transformer with secondary open circuited.
 two winding transformer with secondary short circuited.
None of these
 auto transformer.

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Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / E2
 (V2 - E2) / V2
 (E2 - V2) / V2
 (V2 - E2) / E2

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Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Starting torque.
 Speed regulation.
  Effiency.
 Running Torque.

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