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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

 cross magnetization
All of these
 magnetization
 demagnetization

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 1500 rpm
 30 rpm
 1470 rpm
 zero

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  f / s.
  sf / 2.
  s2.
  sf.

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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?

 1500.
  1435.
 1450.
 1440.

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Electrical Machines
In double cage induction motor, the inner cage offers

  low resistance and high reactance.
  high resistance and low reactance.
  high resistance and high reactance.
  low resistance and low reactance.

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Electrical Machines
What is the highest possible speed of turbo alternators?

 1500 rpm
 3000 rpm
 1000 rpm
 4000 rpm

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