Energy in one Tonne of Oil Equivalent (toe) corresponds to a) 4.187 GJ b) 1.162 MWh c) 10,000 kcal d) none of the above
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Adi S.
1.4 Perform the following energy conversions and calculations: a) A spherical balloon with a diameter of ten feet is filled with natural gas. How much energy is contained in that quantity of natural gas? b) How many Btu are in 200 therms of natural gas? How many Btu in 500 gallons of #2 fuel oil? c) An oil tanker is carrying 20,000 barrels of #2 fuel oil. If each barrel of fuel oil will generate 550 kWh of electric energy in a power plant, how many kWh can be generated from the oil in the tanker? d) How much coal is required at a power plant with a heat rate of 10,000 Btu/kWh to run a 6 kW electric resistance heater constantly for 1 week (168 hours)? e) A large city has a population which is served by a single electric utility which burns coal to generate electrical energy. If there are 500,000 utility customers using an average of 12,000 kWh per year, how many tons of coal must be burned in the power plants if the heat rate is 10,500 Btu/kWh? f) Consider an electric water heater with a 4500 watt heating element. Assuming that the water heater is 98% efficient, how long will it take to heat 50 gallons of water from 70 degrees F to 140 degrees F?
Sri K.
6) What is a reasonable number for the years remaining until the world's oil supply is completely depleted? a) 10 b) 100 c) 200 d) 50 7) The methane in natural gas burns according to the following equation: CH4 + 2O2 ---> CO2 + 2H2O That is, methane plus 2 diatomic oxygens go to a carbon dioxide molecule plus 2 water molecules. Now the question: How many tons of carbon dioxide are produced for each ton of methane that is burned? a) 1.0 b) 2.0 c) 4.0 d) 2.75 8) What is a reasonable number for the boiling point of gasoline? a) 300 to 500 degrees Celsius b) 30 to 200 degrees Celsius c) 200 to 300 degrees Celsius d) 0 to 30 degrees Celsius 9) A British thermal unit (Btu) is a unit of energy. How many Joules are there in a million Btu? a) 1.055 trillion J b) 1.055 billion J c) 1.055 million J d) 1.055 thousand J 10) A horizontal force of 60 pounds is exerted on a crate which moves the crate 20 feet across a horizontal floor in 4 seconds. What is the power generated by this force? a) 0.3 hp b) 5.4 hp c) 0.54 hp d) 3.0 hp 11) In the U.S., we currently import more than ______ of the oil that we consume. a) 33% b) 10% c) 50% d) 90%
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