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Electrical Machines

Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1920W
 2000W
 1820W
 1450W

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Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

 3200 W and 5200 W
 3200 W and 2500 W
 1600 W and 5000 W
 1600 W and 1250 W

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f
 f²
 V
 V²

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Electrical Machines
In case of DC shunt motor if load is reduced

 The speed will increase abruptly.
  The speed will remains almost constant.
 DC Shunt Motor
 The speed will increase in proportion to reduction in load.

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 eddy-current loss
 mechanical loss
 hysteresis loss
 temperature rise

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Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

 will remain the same
 will become leading
None of these
 will become lagging

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