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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?

 2000W
 1450W
 1820W
 1920W

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Electrical Machines
Rotating magnetic field is produced in an induction motor because of

  stator winding.
  either stator winding or rotor winding.
  rotor winding.
None of these

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 3000 rpm
 1500 rpm
 75 rpm
 375 rpm

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to avoid over heating.
All of these
 to avoid locking of the armature.
 to achieve a stronger magnetic field.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 474 V
 240 V
 234 V
 6 V

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Electrical Machines
Torque developed in the rotor is

 directly proportional to slip
 either of these
 not dependent on the slip
 inversely proportional to slip

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