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Electrical Machines

Electrical Machines
Which of the following motors has low ratings only?

 Resistance split phase
 Capacitor start
 Capacitor run
 Shaded pole

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 R1 /K
 K×R1
 K²R1
 R1 /K²

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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 any of the above
 0
 1
 0.5

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  very low
  less than one.
  approx to one.
  greater than one.

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Electrical Machines
Which of the following is the largest conversion device?

 Induction machine
 DC machine
 Synchronous machine
All of these

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

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

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