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Electrical Machines

Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 480 V.
 420 V.
 400 V.
 350 V.

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Electrical Machines
Armature reaction of an unsaturated DC machine is

 demagnetising.
  none of above.
  magnetising.
  crossmagnetising.

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Electrical Machines
At stand still condition the value of slip is

 infinite value
 0
 1
 finite value

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Electrical Machines
In DC generator, the electricity produced in armature is

  DC.
  armature is not present in DC generator.
  AC.
None of these

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

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start motor
All of these
 Capacitor start capacitor run motor
 Resistance split phase motor

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