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Electrical Machines

Electrical Machines
The slip of an induction motor during DC rheostatic braking is

 2 + s.
 1 - s.
  s.
  2 - s.

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Electrical Machines
The principle of dynamically induced emf is utilized in

 thermocouple.
 transformer.
 generator.
 choke.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Hysteresis losses
 Both 1 and 2
 Eddy current losses
 Copper losses

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Electrical Machines
The field system of an alternator is usually excited

  250 / 250 V DC.
  3 - Φ, 50 Hz and 400 V.
  230 V AC.
  110 / 220 V AC.

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

 Operating cost is less.
All of these
 Insulation requirement is less.
 Collecting of large current is simple.

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 45 ppm.
 25 ppm.
  35 ppm.
 20 ppm.

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