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POWER SYSTEMS

Power Systems
What are the tests performed for oil-filled and gas-filled cables ?

 Impulse tests.
 Thermal stability test.
  All of these.
 Load cycle tests.

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Power Systems
What are the methods of laying underground cables?

  Both A and B.
 Draw - in - system / duct - pipe laying.
 Direct laying.
 None of these.

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Power Systems
A 3 core cable gives on test a capacitance of 3.7 µF between two cores. Find the line charging current of the cable when it is connected to 11 kV, 50 Hz system?

 1 A.
  14.76 A.
 1.476 A.
 14.7 mA.

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Power Systems
String efficiency depends upon

  all of these.
 voltage rating of one SCR.
 voltage rating of whole string.
 no. of SCR in the string.

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Power Systems
A thermal protection switch is used to provide protection against

 short circuit.
 over voltage.
  overload.
 temperature.

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