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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - star
 Star - delta
 Star - star
 Delta - delta

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

  400 Amp.
 800 Amp.
 320 Amp.
  0.5 Amp.

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/3, 1/3
 1/√3, 1/√3
 1/3, 1/√3
 1/√3, 1/3

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Electrical Machines
Capacitor start capacitor run provides

  high power factor only.
  high staring torque and high power factor.
  high staring torque only.
  none.

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Electrical Machines
The type of DC motor used for shears and punches is

 Differential compound motor.
 Shunt motor.
 Series motor.
  Cummulative compound motor.

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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

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

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