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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?

 60W
 80W
 100W
 40W

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  not run.
  make noise.
  run normally.
  get over heated.

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Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

 3 X 1012 Ω - cm at 27°C and 0.3 X 1012
 4 X 1012 Ω - cm at 27°C and 0.4 X 1012
 2 X 1012 Ω - cm at 27°C and 0.2 X 1012
  1 X 1012 Ω - cm at 27°C and 0.1 X 1012

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Electrical Machines
Reluctance and hysteresis motors are the types of which electrical motor?

 Stepper motor.
  1 - Φ synchronous motor.
 DC motor.
 3 - Φ induction motor.

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

  1435.
 1440.
 1450.
 1500.

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 motor will not run.
 it will run in same direction.
 it will run in same direction by slowly.
 it will run in opposite direction.

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