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Electrical Machines

Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 20 ppm.
  35 ppm.
 25 ppm.
 45 ppm.

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 20 volts.
 30 volts.
 10 volts.
 40 volts.

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Electrical Machines
Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is

 equal to that of second transformer.
 none of these.
  more than that of second transformer.
 less than that of second transformer.

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

 100W
 60W
 40W
 80W

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 rotor resistance
 supply frequency
None of these
 supply voltage

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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

 15 HP.
  13 HP.
 14 HP.
  10 HP.

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