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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

 3
 1/√3
 √3
 1/3

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Electrical Machines
A short circuit test on a transformer gives

 copper loss at half load.
 copper loss at full load.
  copper loss at any load.
 copper loss at over load.

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 60, 1440.
 1440, 1500.
  60, 1500.
 50, 1500.

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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to

 increase pull out torque
 improve starting torque
 reduce magnetising current and improve power factor
 decrease starting torque

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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 36.36% increase
 18.18% increase
 36.36% increase
 36.36% decrease

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Universal.
  Capacitor run.
  Split phase.
  Repulsion.

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