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Electrical Machines

Electrical Machines
The commutator segments of DC machines are made up of

 hard-drawn copper
 brass
 copper
 copper alloy

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

 Resistance split phase
 Capacitor run
 Shaded pole
 Capacitor start

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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
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 50, s = 4.43 %.
  P = 60, s = 0.96 %.
  P = 40, s = 5.79 %.
  P = 20, s = 3.33 %.

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 Armature current.
 Line current.
 Field current.
 None of above.

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Electrical Machines
Transformer cooling and insulating oil must be of

 low resistivity.
 low BDV.
 high viscosity.
  low viscosity.

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