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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?

 60°
 45°
 30°
 10°

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 100
 50
 1
 10

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Electrical Machines
Tap changer is generally provided in

  power transformer.
 current transformer.
 earthing transformer.
 voltage transformer.

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Electrical Machines
Conservator tank is used

None of these
 to take up the expansion of oil due to temperature rise.
 for better cooling of transformer.
 to act as an oil storage.

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Electrical Machines
The slot edges in a DC machine are made of

 Mild steel.
  Fibre.
 Silicon steel.
 Cast iron.

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Electrical Machines
The armature of a DC motor is laminated to reduce

 eddy current loss.
 friction and windage loss.
 copper loss.
 hysteresis loss.

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