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Electrical Machines

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

  35 ppm.
 20 ppm.
 45 ppm.
 25 ppm.

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Electrical Machines
The flux involved in the emf equation of a transformer has

 average value.
 total value.
  maximum value.
 rms value.

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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is

 2, 3, 4, 5
 2, 3, 4
 2, 3 ,5
 1, 2, 3

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 supply frequency
 supply voltage
 rotor resistance
None of these

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Electrical Machines
Armature coil is short circuited by brushes when it lies

  along neutral axis.
  in any of above positions.
  in none of above positions.
  along field axis.

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 4 times.
 half.
 double.
 one fourth.

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