EGR 240 Exam 1 Study Guide and Practice Questions – Engineering Economics 2026-02-25
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EGR 240 Exam 1 Study
Guide and Practice
Questions – Engineering
Economics
Guidehttps://www.stuvia.com/dashboard!@_)#*)(@$)($@*($@)($@*_Page 1 EGR 240 Exam 1 Study Guide and Practice Questions – Engineering Economics.pdf
,EGR 240 - Exam 1 2026-02-25
A BTU is the English unit for what?
Energy
What are some units for energy?
Calorie, quad, Joule, toc, toe (not Watt or Horsepower)
What is the relationship between power and energy?
Power = energy / time
A kilowatt and a kilowatt hour are units that measure what quantities?
kW - power
kWh - energy
Page 2 EGR 240 - Exam 1.pdf
, EGR 240 - Exam 1 2026-02-25
Suppose that you have two machines. Machine A gives 10 horsepower, and machine B gives 20
horsepower. You will use these machines to lift an object. Suppose that Machine A takes 1 kJ of
energy to lift the object, and it does so in 1 minute.
Select all of the statements below that are correct (there may be one or more)? (We assume
machines are using their full horsepower, and there are no losses.) (Select all that apply)
The object will be lifted in 1/2 minute by machine B and the object will take 1 kJ of energy for
machine B to lift
In the US, how much of the energy that goes into electricity generation ends up as waste, before use
by any industry or consumer?
60 - 70 %
Efficiency of energy conversion is defined as:
Useful energy out / energy in
Page 3 EGR 240 - Exam 1.pdf
*)#u)()@$+((+_@$_@+_)$$+_)+_$@)$@+_)@++)$+_$@)+_$)+_$$+_+_@$+_)
EGR 240 Exam 1 Study
Guide and Practice
Questions – Engineering
Economics
Guidehttps://www.stuvia.com/dashboard!@_)#*)(@$)($@*($@)($@*_Page 1 EGR 240 Exam 1 Study Guide and Practice Questions – Engineering Economics.pdf
,EGR 240 - Exam 1 2026-02-25
A BTU is the English unit for what?
Energy
What are some units for energy?
Calorie, quad, Joule, toc, toe (not Watt or Horsepower)
What is the relationship between power and energy?
Power = energy / time
A kilowatt and a kilowatt hour are units that measure what quantities?
kW - power
kWh - energy
Page 2 EGR 240 - Exam 1.pdf
, EGR 240 - Exam 1 2026-02-25
Suppose that you have two machines. Machine A gives 10 horsepower, and machine B gives 20
horsepower. You will use these machines to lift an object. Suppose that Machine A takes 1 kJ of
energy to lift the object, and it does so in 1 minute.
Select all of the statements below that are correct (there may be one or more)? (We assume
machines are using their full horsepower, and there are no losses.) (Select all that apply)
The object will be lifted in 1/2 minute by machine B and the object will take 1 kJ of energy for
machine B to lift
In the US, how much of the energy that goes into electricity generation ends up as waste, before use
by any industry or consumer?
60 - 70 %
Efficiency of energy conversion is defined as:
Useful energy out / energy in
Page 3 EGR 240 - Exam 1.pdf
