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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 any of the above
 half load
 no load
 full load

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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 become execessively high.
 remain unaltered.
 increase.
 decrease.

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Electrical Machines
The breakdown torque of a synchronous motor varies as

 V²
 1/V²
 1/V
 applied voltage V

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Electrical Machines
A 3 - Φ slip ring motor has

  wound rotor.
  any of the above.
  double cage rotor.
  short-circuited rotor.

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

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

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 get damaged.
 start automatically without trouble.
 develop very low starting torque.
 not start automatically.

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