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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?

 1820W
 1920W
 2000W
 1450W

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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?

 80W
 60W
 40W
 100W

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Electrical Machines
On what factors the speed of dc motor depends?

 Armature current Ia.
 All of these.
 Applied voltage.
 Field flux.

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Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 970 RPM
 940 RPM
 960 RPM
 920 RPM

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  reduce noise level only.
  reduce the eddy currents.
  provide starting torque only.
  prevent hunting and provide the starting torque.

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Electrical Machines
Demagnetization effects which of the following?

 both B and C
 commutation
 reduction in main field flux
 reduces the terminal voltage

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