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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°
 60°
 30°
 10°

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Electrical Machines
CRGO steel is used in the core of transformer to reduce

  hysteresis loss.
 eddy current loss.
 both eddy current and hysteresis loss.
 ohmic loss.

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Electrical Machines
The armature mmf in a dc machine is 1. stationary with respect to field poles 2. stationary with respect to armature 3. rotating with respect to field poles 4. rotating with respect to armature From these, the correct answer is

 2, 3
 1, 4
 2, 4
 1, 3

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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 Ward Leonard control.
 none of above.
 any of above method.
 rheostatic control.

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Electrical Machines
Flux density under trailing pole tips in case of generator will

None of these
 increase
 either increase or decrease
 decrease

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

 constant supply voltage V, starting torque Tst decreases
None of these
 either of these
 constant V, Tst increases

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