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Power Systems

Power Systems
A 20 MVA generator has inertia constant of 0.5 pu. Find new value for 50 MVA base?

 0.5 pu
 0.4 pu
 0.2 pu
 0.1 pu

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Power Systems
The surge impedance of a 400 km long overhead transmission line is 420 Ω. For a 200 km length of the same line, the surge impedance will be

 840 Ω
 420 Ω
 210 Ω
 400 Ω

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Power Systems
The essential requirement(s) for power plants to be operated as peak load plants are

 Quick response to load variation.
 Low capital cost.
 Capability of quick starts.
All of these

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Power Systems
A three phase, 33 kV oil circuit breaker is rated 1200 A, the symmetrical breaking capacity is 2000 MVA, 3 secs. Then the making capacity is

  5100 MVA.
 5500 MVA.
 5200 MVA.
  5000 MVA.

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Power Systems
Apart from the skin effect the non uniformity of the current distribution is also caused by

 ferranti effect
 bundled conductors
 proximity effect
All of these

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Power Systems
The Y bus matrix of 100 bus interconnected system is 90% sparse. Hence the number of transmission lines in the system must be

 500
 450
 900
 250

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