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EGEE Exam #1 Practice Questions with Solutions
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Exam of 7 pages for the course EGEE at EGEE (EGEE Exam #1)
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EGEE Exam #1What type of energy would each of the following be?
A barrel of oil
The sun beating down a solar panel
A piston moving in a car engine - answerA barrel of oil - Chemical energy
The sun beating down a solar panel - Thermal energy
A piston moving in a car engine - Mechanical energy
A steel rod is initially very cold. If it is placed close to a fire, what happens?
A) The steel rod heats up.
B) The fire goes out.
C) Nothing happens. - answerA) The steel rod heats up.
Which do you think is more efficient?
A) A jet engine that produces 70 units of work from 100 units of energy.
B) A vehicle that produces 50 units of work from 100 units of energy.
C) A water mill that produces 10 units of work from 100 units of energy. - answerA) A jet
engine that produces 70 units of work from 100 units of energy.
There are a little more than 7.5 billion people on the planet today, but 2.5 billion people
are using most of the energy. The UN projects that human population will stabilize
around 10 billion people by the year 2100 - an addition of 2.5 billion more people. How
much would energy use increase by if 10 billion people in 2100 are using the amount of
energy 2.5 billion people are using today?
A) 4x
B) 2x
C) 1x
D) 3x - answerA) 4x
Through 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
t= 0.693/rate = 0.693/0.01 = 69.3 years
, What energy growth rate per year would increase world energy use by 400% (2
doubling periods) in 80 years? - answer1.7 per year
t=0.693/rate --> rate=0.693/time
rate= 0.693/40 = 1.7% per year
A wind turbine costs $10 million to construct and generates $1 million worth of electricity
per year. When has the wind turbine paid for itself (what is the pay-back period)? -
answer10 years
What do you think "embedded" energy is? - answerThe energy that goes into making
something.
What is the biggest use of energy in a home? - answerheating and air conditioning
Kevin lives next to a power plant that burns coal. He wants to be more green, so he
buys an electric car that he can plug into his home electricity. What is powering Kevin's
car? - answercoal
Which has more kinetic energy?
A) An oil tanker moored at a terminal.
B) A cubic mile of water (a lake) behind a 300 ft tall dam.
C) An atomic bomb in a silo in North Dakota.
D) A car moving at 120 mph across the Bonneville Salt Flats. - answerD) A car moving
at 120 mph across the Bonneville Salt Flats.
Which series goes from least energetic to most? - answerRadio < infrared < ultraviolet <
x-rays
Which has more potential energy?
A) An oil tanker moving through the Suez Canal.
B) A cubic mile of water (a lake) behind a 300 ft tall dam.
C) An atomic bomb in a silo in North Dakota.
D) A car moving at 120 mph across the Bonneville Salt Flats. - answerB) A cubic mile of
water (a lake) behind a 300 ft tall dam.
Which has more nuclear energy?
A) An oil tanker moving through the Suez Canal.
B) A cubic mile of water (a lake) behind a 300 ft tall dam.
C) An atomic bomb in a silo in North Dakota.
D) A car moving at 120 mph across the Bonneville Salt Flats. - answerC) An atomic
bomb in a silo in North Dakota.
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