FIVE PROBLEMS ON POWER PLANTS
PROBLEM
– 01
Water
for a hydro-electric is obtained from a reservoir with head of 150 m. Calculate
the electrical generated per hour per cubic metre of water. If the hydraulic efficiency
is 0.86 and electrical efficiency is 0.92.
PROBLEM – 02
A
atomic power reactor can deliver 40 MW due to fission of each atom of
Uranium-235. The energy released is 200 MeV. Calculate the mass of Uranium consumed
per hour.
PROBLEM – 03
A
80 MW steam power plant uses coal of calorific value 6400 kcal per Kg. Thermal
efficiency of the station is 30 percent and electrical efficiency is 92 percent.
Calculate the coal consumption per hour, when the station is delivering its
full rated output.
PROBLEM - 04
The
thermal power station has an overall efficiency of 0.3 if 0.6 kg of coal is
burnt to generated one kWh energy output, find the calorific value of coal.
PROBLEM – 05
A
diesel station has the following data:
Fuel
consumption per day = 1000 kg.
Units
generated per day = 5000 kWh.
Calorific
value of diesel = 10000 kcal per kg.
Alternator
efficiency = 96 percent.
Engine
mechanical efficiency = 95 percent.
Calculate
(i) specific fuel consumption (ii) Overall efficiency (iii) thermal efficiency
of engine.
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