POWER SYSTEMS QUIZ

A power station has a maximum demand of 15000 kW. The annual load factor is 50% and plant capacity factor is 40%. What is the reserve capacity of the plant?

7500 kW

6000 kW

3750 kW

3000 kW

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NTPC (National Thermal Power Cooperation) has its only thermal power generating unit in West Bengal at

Katwa.

Farakka.

Bakreshwar.

Durgapur.

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Three generators rated 100 MVA, 11 kV have an impedance of 0.15 pu each. If in the same plant, these generators are being replaced by a single equivalent generator, the effective impedance of equivalent generator will be

0.45 pu

0.25 pu

0.05 pu

0.15 pu

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Characteristics of arc quenching medium is/are

All of these

High dielectric strength

High thermal conductivity

Non flammable

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Which of the following statements is/are true? By increasing of temperature,

sag increase

both 1 and 2

neither 1 nor 2

tension decrease

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Reflector nuclear reactor are made of

beryllium.

boron.

cast iron.

steel.

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Surge impedance loading can be increased by

increasing of capacitance value

increasing of inductance value

increasing of voltage level

both 1 and 2

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Earth fault relay uses the which of the following sequence currents?

negative sequence

positive sequence

any of the above

zero sequence

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If R = 84 ohm/Km, G = 10-6 mho/Km, H = 0.01 H/Km, C = 0.061 μ F/Km and frequency = 1000 Hz, then what is the value of propagation constant of the transmission line

None of them.

0.018 per Km.

0.09 + j 0.018 per Km.

0.01 + j 0.02 per Km.

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Highest pressure generating pump inside the thermal plant is

low pressure heater

high pressure heater

boiler feed pump

All of these

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