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Electrical Machines

Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 1/3
 1/√3
 3
 √3

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Electrical Machines
Maximum power will be developed when back emf is

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

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Electrical Machines
If the excitation is reduced, the power factor is

 unity power factor
 lagging power factor
None of these
 leading power factor

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Electrical Machines
Which of the following machine will have maximum efficiency?

 Induction motor.
 Electrical power generator.
 DC motor.
  Electrical power transformer.

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 140 V
 120 V
 240 V
 175 V

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 69 / 3.
  slip X 50 / 3.
 1.
  slip X 59 / 3.

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