POWER SYSTEMS QUIZ

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

Impulse tests.

All of these.

Thermal stability test.

Load cycle tests.

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A transmission line has 200 km operating at frequency of 10 Hz Hz. Find the type of the line

short transmission line

long transmission line

any of the above

medium transmission line

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The arc voltage produced in an AC circuit breaker is always

leading the arc current by 90°.

in phase opposition with the arc current.

in phase with the arc current.

lagging the arc current by 90°.

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Corona loss is ----------------- on hilly areas than as plain areas.

remain same

None of these

more

less

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The most commonly used material for insulators of overhead lines is

mica

glass

PVC

porcelain

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Surge impedance loading of a transmission line can be increased by

addition of lumped capacitance in series

both 1 and 3

addition of lumped inductance in parallel

increasing its voltage level

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Recovery voltage in CB is equal to

none of these.

transient voltage.

normal frequency 50 Hz rms voltage.

arcing period voltage.

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If the time of operation of a relay for unity TMS is 10 sec. the time of operation of 0.5 TMS will be _______________ secs.

7.

3.

5.

20.

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An hydro-graph indicates

the maximum and minimum run off during the period.

the average run off during the period.

the discharge at any time during the period under consideration.

All of these

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If, for a given alternator in economic operation mode, the incremental cost is given by (0.012 P + 8) Rs/MWh, dPL/dP = 0.2 and plant λ = 25, then power generation is

1000 MW

1250 MW

1500 MW

750 MW

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