EGEE 102 Exam 3 UPDATED ACTUAL
Exam Questions and CORRECT Answers
A process by which energy is transferred as the vibrations of one molecule are passed on to the
next, but there is no movement of energetic atoms or molecules themselves is called _____. -
CORRECT ANSWER conduction,
Conduction a process by which energy is conducted down the rod as the vibrations of one
molecule are passed to the next, but there is no movement of energetic atoms or molecules.
When you insulate the attic of a home the R-value of insulation increases at the same rate as its
thickness. - CORRECT ANSWER true,
R-value is a measure of the effectiveness of an insulation. Its R-value is increases at the same
rate as its thickness
The number of degrees the mean temperature falls below 65 degrees F for a given day is
indicated by _____ . - CORRECT ANSWER HDD
To calculate the heating degree days for a particular day, the day's average outside temperature is
calculated by _____. - CORRECT ANSWER adding the high and low temperatures and then
dividing by two.
You are warmed by the sun. This is an example of heat transfer by _____. - CORRECT
ANSWER radiation,
Radiation is the only mode of heat transfer which does not require a medium. Heat from the sun
reaches the earth through space by radiation.
On cloudless nights, heat escapes from our planet and goes into space by _____. - CORRECT
ANSWER radiation
Natural materials like stone and bricks are not good insulation materials. - CORRECT
ANSWER true
,Most of the synthetic insulation products are poor insulation materials - CORRECT
ANSWER false,
most of the synthetic insulation products such as polystyrene or polyurethane are very effective
insulation materials
Brownies bake in a glass pan using these 2 methods. - CORRECT ANSWER Radiation and
conduction,
The primary means of heat transfer to the brownies baked in a glass pan are radiation of heat
inside the over and conduction of heat from the hot glass pan
The time it takes to recover the additional cost through savings is called _____. - CORRECT
ANSWER payback period
The circulation of air due to temperature differences in a room is called a _____. - CORRECT
ANSWER convective loop
Home heating is the single highest energy expense for a household. - CORRECT
ANSWER true
What is the name of the process by which energy is transferred by the bulk motion of the fluids?
- CORRECT ANSWER Convection
Which of the following indicates the heating requirement at a particular location? - CORRECT
ANSWER Heating Degree Days
The higher the R-value, the greater the insulating effectiveness. - CORRECT ANSWER true
What is the most common fuel for home heating in the US? - CORRECT ANSWER natural
gas
A higher HDD indicates a _____. - CORRECT ANSWER All the above
, The higher HDD indicates a higher heat loss and therefore, higher fuel requirements.
What is the process in which heat is transferred through electromagnetic radiation? - CORRECT
ANSWER Radiation
After a house is built, the easiest place to insulate a house is/are _____. - CORRECT
ANSWER attic
Compared to a house built in the 1960's, a house built today has ______ - CORRECT
ANSWER greater r-vale, built with better insulation
When using a fire place, most of the heated air is lost through the chimney. - CORRECT
ANSWER true, about 75% of heated air is lost through the chimney
A thermos bottle has a shiny interior. What type of heat transfer does this prevent? - CORRECT
ANSWER Radiation
Radiation is transfer of heat through electromagnetic radiation.A shiny surface reflects any
incident radiation.
What is the typical cost of natural gas per million BTUs? - CORRECT ANSWER 5
What is the mechanism by which heat is transferred without the help of any medium (molecules
or atoms)? - CORRECT ANSWER radiation
Warm water rises in a lake and cold water descends. What is this due to? - CORRECT
ANSWER Convection
Exam Questions and CORRECT Answers
A process by which energy is transferred as the vibrations of one molecule are passed on to the
next, but there is no movement of energetic atoms or molecules themselves is called _____. -
CORRECT ANSWER conduction,
Conduction a process by which energy is conducted down the rod as the vibrations of one
molecule are passed to the next, but there is no movement of energetic atoms or molecules.
When you insulate the attic of a home the R-value of insulation increases at the same rate as its
thickness. - CORRECT ANSWER true,
R-value is a measure of the effectiveness of an insulation. Its R-value is increases at the same
rate as its thickness
The number of degrees the mean temperature falls below 65 degrees F for a given day is
indicated by _____ . - CORRECT ANSWER HDD
To calculate the heating degree days for a particular day, the day's average outside temperature is
calculated by _____. - CORRECT ANSWER adding the high and low temperatures and then
dividing by two.
You are warmed by the sun. This is an example of heat transfer by _____. - CORRECT
ANSWER radiation,
Radiation is the only mode of heat transfer which does not require a medium. Heat from the sun
reaches the earth through space by radiation.
On cloudless nights, heat escapes from our planet and goes into space by _____. - CORRECT
ANSWER radiation
Natural materials like stone and bricks are not good insulation materials. - CORRECT
ANSWER true
,Most of the synthetic insulation products are poor insulation materials - CORRECT
ANSWER false,
most of the synthetic insulation products such as polystyrene or polyurethane are very effective
insulation materials
Brownies bake in a glass pan using these 2 methods. - CORRECT ANSWER Radiation and
conduction,
The primary means of heat transfer to the brownies baked in a glass pan are radiation of heat
inside the over and conduction of heat from the hot glass pan
The time it takes to recover the additional cost through savings is called _____. - CORRECT
ANSWER payback period
The circulation of air due to temperature differences in a room is called a _____. - CORRECT
ANSWER convective loop
Home heating is the single highest energy expense for a household. - CORRECT
ANSWER true
What is the name of the process by which energy is transferred by the bulk motion of the fluids?
- CORRECT ANSWER Convection
Which of the following indicates the heating requirement at a particular location? - CORRECT
ANSWER Heating Degree Days
The higher the R-value, the greater the insulating effectiveness. - CORRECT ANSWER true
What is the most common fuel for home heating in the US? - CORRECT ANSWER natural
gas
A higher HDD indicates a _____. - CORRECT ANSWER All the above
, The higher HDD indicates a higher heat loss and therefore, higher fuel requirements.
What is the process in which heat is transferred through electromagnetic radiation? - CORRECT
ANSWER Radiation
After a house is built, the easiest place to insulate a house is/are _____. - CORRECT
ANSWER attic
Compared to a house built in the 1960's, a house built today has ______ - CORRECT
ANSWER greater r-vale, built with better insulation
When using a fire place, most of the heated air is lost through the chimney. - CORRECT
ANSWER true, about 75% of heated air is lost through the chimney
A thermos bottle has a shiny interior. What type of heat transfer does this prevent? - CORRECT
ANSWER Radiation
Radiation is transfer of heat through electromagnetic radiation.A shiny surface reflects any
incident radiation.
What is the typical cost of natural gas per million BTUs? - CORRECT ANSWER 5
What is the mechanism by which heat is transferred without the help of any medium (molecules
or atoms)? - CORRECT ANSWER radiation
Warm water rises in a lake and cold water descends. What is this due to? - CORRECT
ANSWER Convection
