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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 45°
 30°
 60°
 10°

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/3, 1/√3
 1/√3, 1/√3
 1/3, 1/3
 1/√3, 1/3

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Electrical Machines
Induction motors have the advantage of

  less cost.
  simple in construction.
  less maintenance.
  all of below.

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Electrical Machines
Synchronous reactance of an alternator represents

 field winding reactance
 armature reactance and leakage reactance
 a reactance operating at synchronous speed
All of these

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 3 - phase fault.
  line to ground fault.
 line to line fault.
 3 - phase to ground fault.

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Four times.
 Eight times.
 Doubled.
 Remains same.

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