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Power Systems

Power Systems
If the load is short circuited, then reflection coefficient of voltage is

 -1
 -2
 0
 1

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Power Systems
Operating cost of thermal power station is

 less than that of nuclear power plant.
 less than that of hydroelectric power plant.
  less than that of diesel power plant.
 is the same as that of nuclear power plant.

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Power Systems
Lightning arresters are used for

 protection of equipment from short circuits
 protection of equipment from external lightning
All of these
 protection of equipment from open circuits

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Power Systems
Pump storage schemes are used to improve

 the load factor.
 the diversity factor.
  the plant capacity factor as well as the load factor of the power system.
 the power factor.

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Power Systems
If all the sequence voltages at the fault point in a power system are equal, then the fault point is a

 LG
 LL
 LLG
 LLL

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Power Systems
A load centre is at an equidistant from the two thermal generating stations G1 and G2. The fuel cost characteristics of the generating stations are given by F1 = a + bP1 + cP²1 F2 = a + b P2 + 2cP²2 Where P1 and P2 are the generation in MW of G1 and G2, respectively. For most economic generation to meet 300 MW of load, P1 and P2 respectively, are

 100, 200
 175, 125
 200, 100
 150, 150

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