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Electrical Machines

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

 25 ppm.
 20 ppm.
  35 ppm.
 45 ppm.

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.649.
 0.512.
  0.573.
 0.443.

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Electrical Machines
Which of the following will vary the maximum torque?

 rotor resistance R
 rotor reactance X
None of these
 both 1 and 2

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Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

 greater than the primary.
 any of the above.
 less than primary.
 equal to primary.

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 +3%
 -3.33%
 +3.33%
 -3%

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Semi closed slot type machine.
 Closed slot type machines.
 Open slot type machines.
 Any of the above.

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