01․ 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?
02․ The daily energy produced in thermal power station is 720 MWh at a load factor of 0.6. What is the maximum demand of the station?
03․ A power station has a maximum demand of 15 MW. The plant capacity is 20 MW. Find the reserve capacity of the plant?
04․ A generated station has a maximum demand of 30 MW, a load factor of 60% and a plant capacity factor of 50%. The reserve capacity of the plant is
05․ When a pumped storage power plant is operated in conjunction with a steam power plant
Advantages of pumped storage plants:
1. Most economical as a peak load supply plant
2. Used as load frequency control
3. If it is combined with thermal plant of an area load factor is increased
4. Pollution free
5. Easily adaptable for remote operation
6. Operating time is minimum
06․ Which of the following statements is/are true?
Peak load plants:
A peaking power plant is a power station that only runs during high demands of electricity throughout the day during peak hours. Because of that, the price of electricity it generates is generally higher than the electricity generated by base load power plant, which operates continuously throughout the year.
Some examples are
1. Pumped storage plant
2. Diesel plants
3. Hydro plants ( when water availability is less)
4. Gas fired power plants
Advantages of pumped storage plants:
1. Most economical as a peak load supply plant
2. Used as load frequency control
3. If it is combined with thermal plant of an area load factor is increased
4. Pollution free
5. Easily adaptable for remote operation
6. Operating time is minimum
07․ On which one of the following cycles does a modern steam power plant work?
The Rankine cycle is a model that is used to predict the performance of steam turbine systems. The Rankine cycle is an idealized thermodynamic cycle of a heat engine that converts heat into mechanical work. The heat is supplied externally to a closed loop, which usually uses water as the working fluid.
08․ A power station plant load factor is defined as the ratio of
Plant load factor is defined as the ratio of average power generation to the maximum power generation.
Therefore, ideal plant load factor is one and practical load factor is always less than 1.
Therefore, ideal plant load factor is one and practical load factor is always less than 1.
09․ What is the approximate efficiency of a normal thermal power station?
Steam is condensed into the water inside the condenser using circulating water. Most of the energy is wasted in the condenser for conversion of steam into water. So that thermal efficiency is low value i.e., 35 % to 40%.
10․ In coal fired thermal power stations, what are the electrostatic precipitators used for?
The electrostatic precipitators (ESP) are extensively used in the thermal power plant or steam power plant for removal of fly ash from the electric utility boiler emissions. The use of electrostatic precipitators is growing rapidly because of the new strict air code and environmental laws. An electrostatic precipitators can be designed to operate at any desired efficiency for use as primary collector or a supplementary unit to cyclone collector.
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