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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°
 10°
 60°
 30°

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Electrical Machines
Skewing of cage rotors offers the following advantages

  all of below.
  less noise.
  uniform torque.
  locking tendency is reduced.

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Over-loading for long period.
  Over-excitation.
  Small and constant load.
  Periodic variation of load.

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Electrical Machines
The breakdown torque of a synchronous motor varies as

 1/V
 applied voltage V
 V²
 1/V²

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

 Series.
 Differential compound.
  Shunt.
 Cummulative compound.

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 terminal voltage should be same.
 both A and B.
 rating of generators should be same.
 polarities should be same.

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