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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 625 W
 700 W
 650 W
 600 W

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Electrical Machines
Which of the following is minimized by laminating the core of a transformer?

 Stray loss.
 Hysteresis loss.
 Eddy current loss.
 Copper loss.

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

 540 rpm.
 450 rpm.
  470 rpm.
  240 rpm.

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Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 decrease
 either increase or decrease
None of these
 increase

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Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 35°C.
  45°C.
 27°C.
 32°C.

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 it will run in same direction by slowly.
 it will run in opposite direction.
 motor will not run.
 it will run in same direction.

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