EGEE 101 – Final Exam Questions – Energy and Environmental Engineering – exam
preparation material
d - ANS ✔✔Which of these produce the maximum heat?
A) CFL
B) Incandescent bulbs
C) Fluorescent bulbs
D) Halogen bulbs
d - ANS ✔✔In the US, most of the electricity is generated from
A) Wind
B) Fuel oil
C) Hydroelectric
D) Coal
d - ANS ✔✔Which energy source is used most for US home heating?
A) Electricity
B) Coal
C) Oil
D) Natural Gas
c - ANS ✔✔In a light bulb, the useful energy output is in the form of __________ energy.
A) Mechanical
B) Chemical
C) Radiation
D) Thermal / heat
b - ANS ✔✔In the process of refining petroleum, the useful energy output is in the form of
__________ energy.
,A) Mechanical
B) Chemical
C) Radiation
D) Thermal / heat
D - ANS ✔✔If the energy input of a system is 200 calories and its useful output is 138 calories, what is
the efficiency of the system?
A) 0.78
B) 0.7931
C) 0.18
D) 0.69
B - ANS ✔✔Three energy conversion processes take place in succession. The first has an efficiency of
51%, the second is 50% efficient, and the third 5%. What is the efficiency of the entire process?
A) 0.37
B) 0.0128
C) 0.0255
D) 1.11
D - ANS ✔✔An automobile engine gives 30,000 BTUs of mechanical energy from 100,000 BTUs of fuel.
The transmission, axles and tires deliver 27,000 BTUs of mechanical energy to the highway, moving the
car forward. What is the overall efficiency of this vehicle?
A) 27,000
B) 30%
C) 90%
D) 27%
A - ANS ✔✔Which of the following is not a unit of energy?
A) Watts
B) BTUs
,C) Joules
D) Calories
A - ANS ✔✔A watt is a unit of?
A) Power
B) Energy
C) Lighting
D) Mass
D - ANS ✔✔Energy demand is a/an
A) Linear function - it goes up steadily over time
B) Logarithmic function - the longer it goes, the less rapidly it grows
C) Sine function - it goes up and down predictably, in cycles
D) Exponential function - the longer it goes, the more rapidly it grows
B - ANS ✔✔Which sector of the US economy uses energy the least efficiently?
A) Industry and manufacturing
B) Transportation
C) Commercial
D) Residential
D - ANS ✔✔Worldwide, we expect the use of which energy resource to decrease over the next 20
years?
A) Nuclear
B) Coal
C) Hydroelectric
D) None of the above
, A - ANS ✔✔The useful output from a heat engine is 481 joules. The energy that is wasted is 2214 J.
What is the efficiency of the engine?
A) 0.1784
B) 0.217
C) 21.7
D) 4.6
A - ANS ✔✔What is doubling time?
A) Time during which the initial quantity increases by a factor of two
B) Time it takes for a radioactive sample to decrease to half the original mass
C) A measure of radioactive decay
D) Radioactivity
B - ANS ✔✔The quantity of an energy source that is known to exist and that can be economically
recovered is called?
A) Resource
B) Reserve
C) Supply
D) Asset
A - ANS ✔✔If the world demand for energy is growing at the rate of 7% per year, when would we
expect the energy demand to be twice today's?
A) 10 years
B) 6 years
C) 7 years
D) 20 years
D - ANS ✔✔In the US, we rely less on energy from ____________ than in earlier decades?
A) Nuclear
B) Natural gas
preparation material
d - ANS ✔✔Which of these produce the maximum heat?
A) CFL
B) Incandescent bulbs
C) Fluorescent bulbs
D) Halogen bulbs
d - ANS ✔✔In the US, most of the electricity is generated from
A) Wind
B) Fuel oil
C) Hydroelectric
D) Coal
d - ANS ✔✔Which energy source is used most for US home heating?
A) Electricity
B) Coal
C) Oil
D) Natural Gas
c - ANS ✔✔In a light bulb, the useful energy output is in the form of __________ energy.
A) Mechanical
B) Chemical
C) Radiation
D) Thermal / heat
b - ANS ✔✔In the process of refining petroleum, the useful energy output is in the form of
__________ energy.
,A) Mechanical
B) Chemical
C) Radiation
D) Thermal / heat
D - ANS ✔✔If the energy input of a system is 200 calories and its useful output is 138 calories, what is
the efficiency of the system?
A) 0.78
B) 0.7931
C) 0.18
D) 0.69
B - ANS ✔✔Three energy conversion processes take place in succession. The first has an efficiency of
51%, the second is 50% efficient, and the third 5%. What is the efficiency of the entire process?
A) 0.37
B) 0.0128
C) 0.0255
D) 1.11
D - ANS ✔✔An automobile engine gives 30,000 BTUs of mechanical energy from 100,000 BTUs of fuel.
The transmission, axles and tires deliver 27,000 BTUs of mechanical energy to the highway, moving the
car forward. What is the overall efficiency of this vehicle?
A) 27,000
B) 30%
C) 90%
D) 27%
A - ANS ✔✔Which of the following is not a unit of energy?
A) Watts
B) BTUs
,C) Joules
D) Calories
A - ANS ✔✔A watt is a unit of?
A) Power
B) Energy
C) Lighting
D) Mass
D - ANS ✔✔Energy demand is a/an
A) Linear function - it goes up steadily over time
B) Logarithmic function - the longer it goes, the less rapidly it grows
C) Sine function - it goes up and down predictably, in cycles
D) Exponential function - the longer it goes, the more rapidly it grows
B - ANS ✔✔Which sector of the US economy uses energy the least efficiently?
A) Industry and manufacturing
B) Transportation
C) Commercial
D) Residential
D - ANS ✔✔Worldwide, we expect the use of which energy resource to decrease over the next 20
years?
A) Nuclear
B) Coal
C) Hydroelectric
D) None of the above
, A - ANS ✔✔The useful output from a heat engine is 481 joules. The energy that is wasted is 2214 J.
What is the efficiency of the engine?
A) 0.1784
B) 0.217
C) 21.7
D) 4.6
A - ANS ✔✔What is doubling time?
A) Time during which the initial quantity increases by a factor of two
B) Time it takes for a radioactive sample to decrease to half the original mass
C) A measure of radioactive decay
D) Radioactivity
B - ANS ✔✔The quantity of an energy source that is known to exist and that can be economically
recovered is called?
A) Resource
B) Reserve
C) Supply
D) Asset
A - ANS ✔✔If the world demand for energy is growing at the rate of 7% per year, when would we
expect the energy demand to be twice today's?
A) 10 years
B) 6 years
C) 7 years
D) 20 years
D - ANS ✔✔In the US, we rely less on energy from ____________ than in earlier decades?
A) Nuclear
B) Natural gas
