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Electrical Machines

Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

  (3/2)Fmax.
 3Fmax.
 (1/2)Fmax.
 Fmax.

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Electrical Machines
What does happen if tripled harmonics given to induction motor?

  Will results in open circuit.
  Will results in short circuit.
  Fail to start.
  Nothing will happen.

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

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

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 1000 rpm, 950 rpm.
 zero , - 50 rpm.
 zero, 950 rpm.
 1000 rpm, - 50 rpm.

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Electrical Machines
In DC generator, armature reaction refers to what?

 Effect of armature flux on the load.
  Effect of armature flux on the main field flux.
None of these
 Effect of field flux on the armature flux.

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Electrical Machines
Two transformers operating in parallel will share the load depending on their

 per unit impedance
 ratings
 leakage reactance
 efficiency

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