EGEE Exam #1, EGEE 101 Midterm
(FINAL ver) UPDATED ACTUAL Exam
Questions and CORRECT Answers
What 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 - CORRECT ANSWER - A 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. - CORRECT ANSWER - A) 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. - CORRECT
ANSWER - A) 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 - CORRECT ANSWER - A) 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? - CORRECT
ANSWER - 69.3 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? - CORRECT ANSWER - 1.7 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)? - CORRECT
ANSWER - 10 years
What do you think "embedded" energy is? - CORRECT ANSWER - The energy that goes
into making something.
,What is the biggest use of energy in a home? - CORRECT ANSWER - heating 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? -
CORRECT ANSWER - coal
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. - CORRECT ANSWER - D) A
car moving at 120 mph across the Bonneville Salt Flats.
Which series goes from least energetic to most? - CORRECT ANSWER - Radio < 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. - CORRECT ANSWER - B) 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. - CORRECT ANSWER - C)
An atomic bomb in a silo in North Dakota.
Which has more chemical 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. - CORRECT ANSWER - A)
An oil tanker moored at a terminal.
The hot coffee heats the mug which heats my hands which are holding the mug. What method of
heat transfer is it? - CORRECT ANSWER - Conduction
What transformation occurs in the Sun? - CORRECT ANSWER - Nuclear to radiation
What transformation occurs in a computer? - CORRECT ANSWER - Electrical to light/sound
What transformation occurs in a lawn mower? - CORRECT ANSWER - Chemical to
kinetic/mechanical
A power plant consumes 100 MJ of Energy, of which only 24 MJ are wasted heat. What is the
efficiency? - CORRECT ANSWER - 0.76
Efficiency = (Etotal-Ewaste)/Etotal
= (100-24)/100 = 76%
(FINAL ver) UPDATED ACTUAL Exam
Questions and CORRECT Answers
What 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 - CORRECT ANSWER - A 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. - CORRECT ANSWER - A) 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. - CORRECT
ANSWER - A) 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 - CORRECT ANSWER - A) 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? - CORRECT
ANSWER - 69.3 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? - CORRECT ANSWER - 1.7 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)? - CORRECT
ANSWER - 10 years
What do you think "embedded" energy is? - CORRECT ANSWER - The energy that goes
into making something.
,What is the biggest use of energy in a home? - CORRECT ANSWER - heating 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? -
CORRECT ANSWER - coal
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. - CORRECT ANSWER - D) A
car moving at 120 mph across the Bonneville Salt Flats.
Which series goes from least energetic to most? - CORRECT ANSWER - Radio < 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. - CORRECT ANSWER - B) 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. - CORRECT ANSWER - C)
An atomic bomb in a silo in North Dakota.
Which has more chemical 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. - CORRECT ANSWER - A)
An oil tanker moored at a terminal.
The hot coffee heats the mug which heats my hands which are holding the mug. What method of
heat transfer is it? - CORRECT ANSWER - Conduction
What transformation occurs in the Sun? - CORRECT ANSWER - Nuclear to radiation
What transformation occurs in a computer? - CORRECT ANSWER - Electrical to light/sound
What transformation occurs in a lawn mower? - CORRECT ANSWER - Chemical to
kinetic/mechanical
A power plant consumes 100 MJ of Energy, of which only 24 MJ are wasted heat. What is the
efficiency? - CORRECT ANSWER - 0.76
Efficiency = (Etotal-Ewaste)/Etotal
= (100-24)/100 = 76%
