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Electrical Machines

Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 2 to 3.
 3 to 5.
  1.5 to 2.
 1.0.

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 60, s = 0.96 %.
  P = 40, s = 5.79 %.
  P = 20, s = 3.33 %.
  P = 50, s = 4.43 %.

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Electrical Machines
Armature reaction in dc motor results

  open circuit.
  short circuit.
  decrease in speed.
  increase in speed.

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Electrical Machines
Commonly used starters of cage motor is

None of these
  star delta.
  DOL.
  both A and B.

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 unity
 0.9 lag
 0.2 lead
 0.2 lag

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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.
 1440.
 1450.
  1435.

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