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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 25° to 30°
 90°
 0°
 70° to 85°

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Electrical Machines
Which type of motors are preferred in lifts?

 DC compound motors.
 DC series motors.
 DC shunt motors.
None of these

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Reluctance motor.
  Stepper motor.
 Hysteresis motor.
 Shaded pole motor.

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Electrical Machines
Which of the following methods of speed control is not affected through stator side?

  Change of number of pole.
  Change of supply frequency.
  Change of rotor resistance.
  Change of supply voltage.

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

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

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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.
 rheostatic control.
 any of above method.

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