EGEE Exam 3 ACTUAL Exam Questions
and CORRECT Answers
We know that, electrical resistance heating systems approach an efficiency of 97%. Electrical
baseboard heating is more efficient than a heat pump. - CORRECT ANSWER - False
Electrical resistance heating systems converts electricity to heat. All the heat is obtained from
electricity. But, heat pump heat our house by moving heat from low temperature surrounding to
high temperature interior. Electricity is only used to run compressor.
Due to convection, a house with an electric radiant system and floors with a high thermal mass
can reduce heating costs if the electric company offers "time-of-use" rates. - CORRECT
ANSWER - False
An electric radiant system heats through radiation, not convection.
Where there is limited space, a hydronic heating system can be installed vertically. - CORRECT
ANSWER - False
A GHP can be installed vertically if there is limited space. A hydronic heating system must be
installed horizontally underneath the floor to be effective
Of the following sources, where does a typical home lose most of its heat? - CORRECT
ANSWER - Cracks in walls, windows and doors
Which of the following air systems is the most commonly used type of central heating and
cooling system? - CORRECT ANSWER - Forced Air Duct
How many degree days are accumulated in a seven day period when the average outside
temperature is 30 oF? - CORRECT ANSWER - 245
HDD = 65 - outside temperature HDD for 7 days = 7 x (65-30) = 7 x 35 = 245 degree-days
,The higher the R-value, the greater the insulating effectiveness. - CORRECT ANSWER -
True
R-value is a measure of insulating effectiveness of a material. The higher the R-value, the greater
the insulating efectiveness
What is the typical cost of natural gas per million BTUs? - CORRECT ANSWER - $4.0
1000 cu.ft of natural gas gives 1 MMBTU of heat.Natural gas costs around $11 per 1000 cu.ft
Which of the following values indicate the heating requirement at a particular location? -
CORRECT ANSWER - Heating Degree Days
The R-value of thermal insulation depends on _____. - CORRECT ANSWER - A) the type of
material
B) the thickness
C) density
*D) all the above*
The R-value of thermal insulation depends on the type of material, its thickness, and its density.
A higher HDD indicates _____. - CORRECT ANSWER - A) Higher heat loss
B) Higher fuel requirements
C) Higher temperature difference between inside and outside of the house
*D) All the above*
The higher HDD indicates a higher heat loss and therefore, higher fuel requirements.
,HDD is used to estimate the amount of energy required for residential space heating during
heating season. - CORRECT ANSWER - True
HDD is used to estimate the amount of energy required for residential space heating during a
heating season.
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
Convection is the process by which energy is transferred by the bulk motion of the fluids.
Heat in a room from an air register moves from warmer areas to cooler areas of the room due to
_____. - CORRECT ANSWER - Convection
Convection is a process by which energy is transferred by the bulk motion of the fluids (gases or
liquids).
In a conventional oven, brownies bake in a glass pan using these two methods - CORRECT
ANSWER - Radiation and conduction
Brownies are baked by heat transfer from the coils by radiation and from the glass pan by
conduction.
On cloudless nights, heat escapes from our planet and goes into space by _____. - CORRECT
ANSWER - Radiation
Radiation is the only type of heat of transfer that doesn't require a medium
, 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
To calculate the heating degree days for a particular day, find the day's average outside
temperature (by adding the high and low temperatures), then dividing by two
The R-value of a composite wall is calculated by _____. - CORRECT ANSWER - adding the
R-values of all layers
The R-value of a composite wall is calculated by adding the effective R-values of each of the
layers of the wall.
Most of the synthetic insulation products are very effective insulation materials. - CORRECT
ANSWER - True
Most of the synthetic insulation products such as polystyrene or polyurethane are very effective
insulation materials.
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 compared to natural materials like stone or wood or brick.
A room has a wall with an R value of 16 F sq.ft. hr/BTU. The room is 16 feet long and 8 feet
wide, with walls that are 9 ft high. On a particular day the average outside temperature is 34
degrees F. How much heat is transferred through the walls on that day (in BTUs)? - CORRECT
ANSWER - 20088 BTUs
Total area of walls = 2 ((16 x 9) + (8 x 9)) = 432 sq.ft
HDD = 65-34 = 31 oF
and CORRECT Answers
We know that, electrical resistance heating systems approach an efficiency of 97%. Electrical
baseboard heating is more efficient than a heat pump. - CORRECT ANSWER - False
Electrical resistance heating systems converts electricity to heat. All the heat is obtained from
electricity. But, heat pump heat our house by moving heat from low temperature surrounding to
high temperature interior. Electricity is only used to run compressor.
Due to convection, a house with an electric radiant system and floors with a high thermal mass
can reduce heating costs if the electric company offers "time-of-use" rates. - CORRECT
ANSWER - False
An electric radiant system heats through radiation, not convection.
Where there is limited space, a hydronic heating system can be installed vertically. - CORRECT
ANSWER - False
A GHP can be installed vertically if there is limited space. A hydronic heating system must be
installed horizontally underneath the floor to be effective
Of the following sources, where does a typical home lose most of its heat? - CORRECT
ANSWER - Cracks in walls, windows and doors
Which of the following air systems is the most commonly used type of central heating and
cooling system? - CORRECT ANSWER - Forced Air Duct
How many degree days are accumulated in a seven day period when the average outside
temperature is 30 oF? - CORRECT ANSWER - 245
HDD = 65 - outside temperature HDD for 7 days = 7 x (65-30) = 7 x 35 = 245 degree-days
,The higher the R-value, the greater the insulating effectiveness. - CORRECT ANSWER -
True
R-value is a measure of insulating effectiveness of a material. The higher the R-value, the greater
the insulating efectiveness
What is the typical cost of natural gas per million BTUs? - CORRECT ANSWER - $4.0
1000 cu.ft of natural gas gives 1 MMBTU of heat.Natural gas costs around $11 per 1000 cu.ft
Which of the following values indicate the heating requirement at a particular location? -
CORRECT ANSWER - Heating Degree Days
The R-value of thermal insulation depends on _____. - CORRECT ANSWER - A) the type of
material
B) the thickness
C) density
*D) all the above*
The R-value of thermal insulation depends on the type of material, its thickness, and its density.
A higher HDD indicates _____. - CORRECT ANSWER - A) Higher heat loss
B) Higher fuel requirements
C) Higher temperature difference between inside and outside of the house
*D) All the above*
The higher HDD indicates a higher heat loss and therefore, higher fuel requirements.
,HDD is used to estimate the amount of energy required for residential space heating during
heating season. - CORRECT ANSWER - True
HDD is used to estimate the amount of energy required for residential space heating during a
heating season.
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
Convection is the process by which energy is transferred by the bulk motion of the fluids.
Heat in a room from an air register moves from warmer areas to cooler areas of the room due to
_____. - CORRECT ANSWER - Convection
Convection is a process by which energy is transferred by the bulk motion of the fluids (gases or
liquids).
In a conventional oven, brownies bake in a glass pan using these two methods - CORRECT
ANSWER - Radiation and conduction
Brownies are baked by heat transfer from the coils by radiation and from the glass pan by
conduction.
On cloudless nights, heat escapes from our planet and goes into space by _____. - CORRECT
ANSWER - Radiation
Radiation is the only type of heat of transfer that doesn't require a medium
, 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
To calculate the heating degree days for a particular day, find the day's average outside
temperature (by adding the high and low temperatures), then dividing by two
The R-value of a composite wall is calculated by _____. - CORRECT ANSWER - adding the
R-values of all layers
The R-value of a composite wall is calculated by adding the effective R-values of each of the
layers of the wall.
Most of the synthetic insulation products are very effective insulation materials. - CORRECT
ANSWER - True
Most of the synthetic insulation products such as polystyrene or polyurethane are very effective
insulation materials.
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 compared to natural materials like stone or wood or brick.
A room has a wall with an R value of 16 F sq.ft. hr/BTU. The room is 16 feet long and 8 feet
wide, with walls that are 9 ft high. On a particular day the average outside temperature is 34
degrees F. How much heat is transferred through the walls on that day (in BTUs)? - CORRECT
ANSWER - 20088 BTUs
Total area of walls = 2 ((16 x 9) + (8 x 9)) = 432 sq.ft
HDD = 65-34 = 31 oF
