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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2HZ
 1 Hz
 50Hz
 2.5Hz

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC series motor.
 Separately excited DC motor.
 DC compound motor.
 DC Shunt motor.

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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Reluctance motors.
  Universal motors.
  Induction motors.
  Stepper motors.

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Electrical Machines
Maximum power will be developed when back emf is

 equal to supply voltage.
All of these
 double the supply voltage.
 half of the supply voltage.

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

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

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

All of these
 Collecting of large current is simple.
 Operating cost is less.
 Insulation requirement is less.

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