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Power Systems

Power Systems
In which of the following given faults, all the sequence currents are equal?

 LLG
 LL
 LG
 LLL

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Power Systems
Maximum efficiency of modern coal fired steam raising thermal power plants is restricted to about 035 (a low value), mainly because of

 low alternative efficiency.
 high energy loss in boiler.
 low steam turbine mechanical efficiency.
  high energy loss from turbine exhaust to condenser.

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Power Systems
Advantages of gauss siedel method is/are

 applicable for large power system network
All of these
 calculation time for each iteration is less
 number of iterations are less

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Power Systems
A generator has a rating of 10 MVA, 5 kV has a reactance of 0.02 pu. Find the reactance at a new base values of 50 MVA, 10 kV?

 0.05
 0.02
 0.25
 0.025

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Power Systems
If we increase the spacing between the phase conductors, the line capacitance

 increases
 decreases
 remains unaffected
None of these

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Power Systems
Mho relays are used for the protection of which of the following lines?

 short transmission lines only
 medium transmission lines only
None of these
 long transmission lines only

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