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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?

 1450W
 1920W
 2000W
 1820W

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Electrical Machines
Regenerative braking is possible in

 DC compound motor.
  DC shunt motor with field weakening control.
 DC series motor.
 DC shunt motor with armature resistance control.

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Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 19%
 40%
 5%
 10%

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

 9.6 kW, 12 kW.
 9.3 kW, 9.3 kW.
 5.7 kW, 8.7 kW.
  6.3 kW, 9.3 kW.

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

  Commutator.
 Brush.
 Armature.
 Yoke.

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 40 V
 20 V
 zero
 50 V

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