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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?

 40W
 60W
 100W
 80W

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia.
  Ia2.
  √Ia.
  1/Ia.

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Electrical Machines
Which type of motors are used for lathes?

 DC shunt motors.
 Either A or B.
 Synchronous motor.
 Cage induction motor.

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Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 60°
 45°
 10°
 30°

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Electrical Machines
The stator frame in an induction motor is used to

  protect the whole machine.
  provide return path for the flux.
  hold armature stamping in position.
  ventilate the armature.

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/√3, 1/√3
 1/3, 1/√3
 1/3, 1/3
 1/√3, 1/3

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