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EGEE (official) practice exam Questions and Answers Graded A+
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EGEE (official) practice exam
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EGEE (official) practice examTrue or False? Photovoltaic solar panel is pollution free energy technology. - answer
false
true or false? any energy technology that has lifecycle environmental costs associated
with mining raw materials, manufacturing, and transportation are NOT pollution free -
answer true
which list contains only renewable energy resources? - answer solar, wind, hydropower
Why is the global energy demand is quickly growing? Check all that apply. - answer due
to population growth
due to people striving for higher standard of living
The majority of the world's used energy comes from ______ - answerfossil fuels
true or false? most of the energy people use in the world is converted from fossil fuel
combustion - answertrue
True or False? Energy is produced when fossil fuels are burnt. - answerfalse
Heat spontaneously flows from a body with a higher temperature to a body with a lower
temperature. - answertrue
What type of energy is stored in a gallon of gasoline? - answerchemical
What kind of energy conversions occurs in the clothes dryer? (Check all that apply) -
answerelectrical to mechanical
electrical to thermal
What kind of energy conversions occur in the incandescent light bulb? Check all that
apply. - answerelectric to thermal
thermal to radiant
Which of the following is unit of power? - answerwatt
Which of the following are units of energy. Check all that apply - answerBTU
calorie
joule
kW is a unit of - answerpower
, kWh is a unit of - answerenergy
What would be the correct way to find the energy used by an electric appliance? -
answermultiply power by time
How much energy is used by a 1100 W refrigerator over 2 days? - answer52.8 kWh
Multiply 1100 W by 48 hours (2 days) = 52,800 Wh = 52.8 kWh
Bulb A is 25 W and was on for 4 hours. How much energy did it use? - answer100
25x4
Find the efficiency of the device that outputs 12,000 BTU of thermal energy while
consuming 16,000 BTU of electrical energy from the grid. Input your answer (%) below
(number only) - answer75%
output/input
How much light energy would a light bulb supply if over a day it consumes 750 Wh from
the electric grid, and its efficiency is 12%? Input your answer below in Wh (number only)
- answer90
750 x 0.12
How much fuel energy would a furnace need as input if the useful output requirement
(heat energy) is 250,000 BTU, and the furnace efficiency is 90%? - answer277,777 BTU
useful/ efficiency value
If a solar collector converts incident solar radiation to heat with efficiency 61%, and the
heat exchanger converts heat of the fluid to heat of water storage with efficiency of
89%, what is the total efficiency of this system? (tip: system efficiency is typically a
product of all efficiencies in the process) - answer54%
multiply
True or False? The world's oil reserves represent the amount of fuel that has been
demonstrated to exist and can be economically extracted with available technologies -
answertrue
true or false? reserves are "extractable" resources - answertrue
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