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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 25 Hz
 50 Hz
 0 Hz
 100 Hz

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  capacitor start.
  capacitor run.
  shaded pole type.
  split phase.

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Electrical Machines
Demagnetization effects which of the following?

 reduction in main field flux
 reduces the terminal voltage
 commutation
 both B and C

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Electrical Machines
When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then

 I1 < I2
 I1 > I2
 I1 = I2
None of these

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

  1 mg of KOH / gm.
 2 mg of KOH / gm.
  0.3 mg of KOH / gm.
 0.5 mg of KOH / gm.

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Electrical Machines
In a dc machine, 1. physically, the brush axis is along the direct axis 2. physically, the brush axis is along the interpolar axis 3. schematically, the brush axis is along the direct axis 4. schematically, the brush axis is along the quadrature axis 5. armaturemmf is directed along the brush axis From these, the correct statements are

 1 , 3, 5
 2, 4, 5
 1, 4,5
 2, 3, 5

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