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EGEE101 practice questions and Answers
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EGEE101 practice questions
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EGEE101 practice questionsThrough a combination of fertility rate and decreased poverty levels, a population's
energy use is growing exponentially 1% per year.
How many years until the energy use doubles? - answer69.3 years
What energy growth rate per year would increase world energy use by 400% 92
doubling periods) in 80 years? - answer1.7% per year
What has more kinetic energy? - answerA car moving at 120 mph across the bonneville
salt flats
Which series goes from least energetic to most? - answerRadio< infrared< ultraviolet<
x-rays
What has more potential energy? - answerA cubic mile of water (a lake) behind a 300 ft
tall dam
Which has more chemical energy? - answerAn oil tanker moored at a terminal
Which has more nuclear energy? - answerAn atomic bomb in a silo in North Dakota
What transformation occurs in a computer? - answerElectrical to light/sound
The hot coffee heats the mug which heats my hands which are holding the mug, what
method of heat transfer is it? - answerConduction
What transformation occurs in the sun? - answerNuclear to radiation
What transformation occurs in a lawn mower? - answerChemical to kinetic/ mechanical
A power plant consumes 100 MJ of energy, of which only 24 MJ are wasted heat. What
is the efficiency? - answer0.76
a power plant converts 100 KJ of coal into 30 KJ of electrical energy. What is the
efficiency? - answer30%
Your home converts 30 KJ of electrical energy into 15 KJ of useful energy (heat,electric)
and 15 KJ of wasted energy. What is your home's efficiency? - answer50%
, It took 100 KJ of coal to produce the 15 KJ of useful energy in your home. What is the
total efficiency? - answer15%
Penn state natural gas plant produces 7 MW of power. If it runs at 70% efficiency and
has 7 MW Power Out, what is the rate of energy input? - answer10 MW
Penn state natural gas plant produces 7 MW of power. What if Penn State could
successfully reuse 1/3rd of the remaining rejected heat... what is the new process
efficiency? - answer80%
If Penn states power generation is 70% efficient and campus efficiency (dorms, labs,
lecture halls) is raised from 50% to 90%, what is the new process efficiency? -
answer63%
Kevin wants to use less fossil fuel by purchasing an electric vehicle. EV's are currently
about 50% efficient. The power in Kevin's neighborhood comes from a coal-fired power
plant. When Kevin plugs his EV in at night, what is powering his car? - answerCoal
Kevin wants to use less fossil fuel by purchasing an electric vehicle. EV's are currently
about 50% efficient. The grid is about 20% efficient and Kevin's EV is about 50%
efficient. What is the total efficiency of this process? - answer10%
Kevin wants to use less fodder fuel by purchasing an electric vehicle. EV's are currently
about 50% efficient. Gasoline engines are about 25% efficient. What is better for Kevin's
wallet and for the environment? - answer25% overall efficient use of gasoline
Kevin lives next to a coal fired power plant. He wants to be greener, so he buys an
electric vehicle, which he charges with his home's electricity. Is Kevin helping the
environment? - answerNo, the process efficiency and carbonized power grid make
Kevin's EV dirtier than an IC (internal combustion vehicle)
In 2019 the U.S. used 100.2 quads of energy out of which 67.5 quads were rejected
energy. What is the US energy efficiency - answer32%
At $52 /ton, what is the price of coal per MMBTU? - answer$2
At $260/ ton, what is the price of coal per MMBTU - answer$10
At $58/bbl, what is the price of oil per MMBTU? - answer$10
At $3/MCF, what is the price of natural gas per MMBTU? - answer$3
What is the weight percent of fixed carbon if moisture = 3 wt. %, volatile matter = 37wt.
%, and ash 10 at. %? - answer50%
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