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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
If the speed of a dc motor increases with load torque, then it is a

 series motor
 differentially compounded motor
 comulatively compounded motor
 permanent magnet motor

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 6 V
 234 V
 474 V
 240 V

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Electrical Machines
Total core loss is also called as -------------?

 Hysteresis loss
 Magnetic loss
 Copper loss
 Eddy current loss

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Electrical Machines
The function of field regulator in a DC compound motor is to

 none of above.
 limit the armature current.
 control field current.
 vary the armature resistance.

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

 2.
  8.
 4.
 1.

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