POWER SYSTEMS QUIZ

Power transmission lines are transposed to reduce

skin effect

radio interference

proximity effect

ferranti effect

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A three phase, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 secs. The symmetrical breaking current is

45 kA.

50 kA.

35 kA.

55 kA.

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Lightning arresters are made up of which material?

silicon oxide

any of the above

copper

silver

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At slack bus, which one of the following combinations of variables is not specified?

P and Q

P and V

V and δ

Q and V

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Advantages of higher transmission voltage is/are

Area of cross section and volume of the conductor is reduced

Power transfer capability of the transmission line is increased

Transmission line losses are reduced

All of these

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The pu parameters for a 500 MVA machine on its own base are: Inertia, H = 20 pu; reactance X = 2 pu. The pu values of inertia and reactance on 100 MVA common base, respectively, are

100, 10

4, 0.4

4, 10

100, 0.4

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Efficiency of thermal power plant can be taken as

generator efficiency.

product of efficiencies of all stages.

efficiency of thermal cycle.

turbine efficiency.

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Surge impedance loading of a transmission line can be increased by

addition of lumped inductance in parallel

both 1 and 3

increasing its voltage level

addition of lumped capacitance in series

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Merze price current scheme protection is used in

alternator.

transformer.

bus bars.

both A and B.

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Which of following are the fertile materials

U238 and Th239.

U233 and Pu239.

U238 and Th232.

U238 and Pu239.

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