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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.
 1.0.
 3 to 5.
  1.5 to 2.

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Electrical Machines
Swinburne test is conducted under which of the following condition?

 no load
 any of the above
 full load
 half load

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Electrical Machines
Which of the following motor has the highest power factor at full load?

 Shaded pole
 Resistance split phase
 Capacitor run
 Capacitor start

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Electrical Machines
Generator works on the principle of production

 static induced emf.
None of these
 both A and B.
 dynamically induced emf.

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Electrical Machines
In a 12 pole triplex lap wound DC armature, each conductor can carry current of 100 A. The rated current of this armature is

 2400 A.
 1200 A.
 600 A.
  3600 A.

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

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

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