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Electrical Machines

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
 80W
 40W
 60W

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Electrical Machines
Armature of DC machine is made of

 conducting material.
 silicon steel.
 non-ferrous material.
 insulating material.

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Electrical Machines
Series generators are used in which of the following applications?

 Air crafts.
 Used as boosters in dc distribution or transmission.
 Arc welding.
All of these

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Electrical Machines
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be

  0.54 Ω.
 0.06 Ω.
 0.54 Ω.
 0.01 Ω.

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Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 90°
 70° to 85°
 0°
 25° to 30°

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

  Shunt.
 Series.
 Differential compound.
 Cummulative compound.

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