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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°
 30°
 10°
 45°

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 back emf is equal to applied voltage.
 none of above.
 back emf is equal to twice of applied voltage.
 back emf is equal to half of applied voltage.

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Electrical Machines
Which of the following will vary the maximum torque?

 both 1 and 2
None of these
 rotor resistance R
 rotor reactance X

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

 Inversely proportional to armature current.
  Constant.
 Proportional to the square of armature current.
 Proportional to armature current.

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  minimum.
  variable.
  maximum.
  constant.

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 near to 1.
 0.25.
 0.5.
 Greater than 1.

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