Exam 1: Egee 102 Penn State UPDATED
ACTUAL Exam Questions and CORRECT
Answers
True or False? Over the recent decades, the annual energy use was growing faster in the
industrialized countries compared to developing economies. - CORRECT ANSWER - False
What is reflected by the GDP (gross domestic product) per capita? - CORRECT ANSWER -
Value of goods an average person can purchase per year
Complete the sentence. One BTU of energy is enough to _______. - CORRECT ANSWER -
Heat one pound of water by one degree Fahrenheit.
Complete the sentence. One calorie is defined as the amount of energy that is required to raise
the temperature of _____. - CORRECT ANSWER - 1 g of water by 1ºC.
What type of energy is provided by gasoline fuel? - CORRECT ANSWER - Chemical
Which one of the following is a unit of power? - CORRECT ANSWER - Watt
True or False? Energy cannot be created or destroyed, but can only be converted from one form
to another. - CORRECT ANSWER - True
True or False? A BTU has more energy than a calorie. - CORRECT ANSWER - True
What type of energy is possessed by a football thrown by a quarterback? - CORRECT
ANSWER - Mechanical kinetic, Mechanical potential, and thermal
, Two cars of the same mass are moving the same direction at speeds 40 and 80 miles per hour
respectively. What is the difference in kinetic energy between these two cars? - CORRECT
ANSWER - 4 times
An electric bulb rated at 60 W is used for 12 hours. How much energy is burned? - CORRECT
ANSWER - 720 Wh (multiply 60 W by 12 hours)
A 100 watt incandescent light bulb is operated for 120 hours, and a 15 watt fluorescent light bulb
is operated for the same time. At the local price of electricity of 10 cents per kWh, what cost
savings are achieved for that period of time by using the fluorescent bulb? - CORRECT
ANSWER - $1.02
(Energy=Power x duration, bulb 1: 100W x 120h = 12,000Wh=12kWh;
bulb 2: 15W x 120h = 1,800 Wh=1.8kWh.
The energy savings is the difference (12-1.8)kWh=10.2kWh;
at the rate of 10 cents per kWh this amounts to $1.02)
What is true about energy conversion devices according to the energy conservation principle (1st
Law of Thermodynamics)? - CORRECT ANSWER - Total Energy Input = Useful Energy
Output + Energy Dissipated to Surroundings
Approximately what percentage of electrical energy input does an incandescent light bulb
convert into visible light? - CORRECT ANSWER - 2.5%
What is the form of useful energy output in the case of a car? - CORRECT ANSWER -
Mechanical
A car converts chemical energy from the burning of fuel into mechanical energy (rotation of
wheels)
What is the main form of useful energy output in the case of a TV? - CORRECT ANSWER -
Radiation
ACTUAL Exam Questions and CORRECT
Answers
True or False? Over the recent decades, the annual energy use was growing faster in the
industrialized countries compared to developing economies. - CORRECT ANSWER - False
What is reflected by the GDP (gross domestic product) per capita? - CORRECT ANSWER -
Value of goods an average person can purchase per year
Complete the sentence. One BTU of energy is enough to _______. - CORRECT ANSWER -
Heat one pound of water by one degree Fahrenheit.
Complete the sentence. One calorie is defined as the amount of energy that is required to raise
the temperature of _____. - CORRECT ANSWER - 1 g of water by 1ºC.
What type of energy is provided by gasoline fuel? - CORRECT ANSWER - Chemical
Which one of the following is a unit of power? - CORRECT ANSWER - Watt
True or False? Energy cannot be created or destroyed, but can only be converted from one form
to another. - CORRECT ANSWER - True
True or False? A BTU has more energy than a calorie. - CORRECT ANSWER - True
What type of energy is possessed by a football thrown by a quarterback? - CORRECT
ANSWER - Mechanical kinetic, Mechanical potential, and thermal
, Two cars of the same mass are moving the same direction at speeds 40 and 80 miles per hour
respectively. What is the difference in kinetic energy between these two cars? - CORRECT
ANSWER - 4 times
An electric bulb rated at 60 W is used for 12 hours. How much energy is burned? - CORRECT
ANSWER - 720 Wh (multiply 60 W by 12 hours)
A 100 watt incandescent light bulb is operated for 120 hours, and a 15 watt fluorescent light bulb
is operated for the same time. At the local price of electricity of 10 cents per kWh, what cost
savings are achieved for that period of time by using the fluorescent bulb? - CORRECT
ANSWER - $1.02
(Energy=Power x duration, bulb 1: 100W x 120h = 12,000Wh=12kWh;
bulb 2: 15W x 120h = 1,800 Wh=1.8kWh.
The energy savings is the difference (12-1.8)kWh=10.2kWh;
at the rate of 10 cents per kWh this amounts to $1.02)
What is true about energy conversion devices according to the energy conservation principle (1st
Law of Thermodynamics)? - CORRECT ANSWER - Total Energy Input = Useful Energy
Output + Energy Dissipated to Surroundings
Approximately what percentage of electrical energy input does an incandescent light bulb
convert into visible light? - CORRECT ANSWER - 2.5%
What is the form of useful energy output in the case of a car? - CORRECT ANSWER -
Mechanical
A car converts chemical energy from the burning of fuel into mechanical energy (rotation of
wheels)
What is the main form of useful energy output in the case of a TV? - CORRECT ANSWER -
Radiation
