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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  simple in construction.
  all of below.
  less cost.
  less maintenance.

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 59 / 3.
  slip X 69 / 3.
 1.
  slip X 50 / 3.

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Electrical Machines
Which of the following statements are correct ?

 Both 1 and 2.
None of these
 The leakage reactance of the induction motor should be small.
 A small value of leakage reactance will increase the maximum power output of motor.

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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 975 rpm
 1000 rpm
 950 rpm
 940 rpm

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Electrical Machines
Which of the following machine is invariably provided with forced ventilation?

 Fractional horse power slow speed motor.
  Hermetically sealed motor of refrigerator.
 Fractional horse power high speed motor.
 50 MW generator in a power plant.

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Electrical Machines
Number of tappings for each equalizer ring is equal to

  number of pole pairs.
  number of poles.
  number of parallel paths.
  number of commutator segments.

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