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Electrical Machines

Electrical Machines
Total core loss is also called as -------------?

 Eddy current loss
 Hysteresis loss
 Copper loss
 Magnetic loss

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.1.
  1.0.
  0.05.
  0.5.

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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?

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

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Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 remains constant.
 decreases
 decreases.
 increases.

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Electrical Machines
The rotor speed of an induction motor is given by

  Ns = 120f / p × ( 1 - s ).
  Nr = 120f / p × (1-s).
None of these
  Ns = 120f /p × ( 1 - r).

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Electrical Machines
Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A. Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current. Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current. The output voltage of each generator will be

 271.7 V.
 238.2 V.
 240 V.
  256.4 V.

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