EGEE 102 Exam 4 UPDATED ACTUAL
Exam Questions and CORRECT Answers
The circulation of air due to temperature differences in a room is called a ____________. -
CORRECT ANSWER Convective loop
After a house is built, the easiest place to insulate a house is/are _____________. - CORRECT
ANSWER Attic
What is the average cost of electricity in the US? - CORRECT ANSWER $80/MWh
Oil is sold in a particular region at $1.10/gal and natural gas at $11.47 per MCF. Given that the
oil has a heating value of 140,000 Btus/gal and natural gas of 1 MMBtu/MCF, which fuel is
cheaper to use? - CORRECT ANSWER Oil
HDD is used to estimate the amount of energy required for residential space heating during a
cool season. - CORRECT ANSWER True
What is the process in which heat is transferred through electromagnetic radiation? - CORRECT
ANSWER Radiation
Warm water rises in a lake and cold water descends. What is the name given to this process? -
CORRECT ANSWER Convection
The R-value of a composite wall is calculated by __________. - CORRECT
ANSWER adding the R-values of all layers
Most of the synthetic insulation products are poor insulation materials. - CORRECT
ANSWER False
, Oil is sold in a particular region at $1.60/gal. Its heating value is 117000 BTU/gal. What is the
heating cost per MMBTU? - CORRECT ANSWER $13.68/MMBTU
A wall is made up of the following materials: Plasterboard (R=0.45), 3.5 inches of fiberglass
(R=3.11/inch), Plywood (R=0.94), and Wood Siding (R=0.81). This wall is 11 feet long and 8
feet high. On particular day the average outside temperature is 34 degrees F. What is the R-value
that you would use to calculate the heat loss?
Recall that Heat loss = (Temp Diff * Area)/R-value (Units: BTU/h) - CORRECT
ANSWER $13.08 F sq.ft.h/BTU
Pat has 1200 ft2 of roof in his home in Pittsburgh, PA (HDD = 6,000). He is considering
upgrading the insulation from R-16 to R-22. The estimate from the contractor was $594. His
home is heated with natural gas. Last year, the average price he paid for natural gas was
$14.1/MCF. Assuming an AFUE of 82.4%, how long will it take Pat to recover his investment? -
CORRECT ANSWER 11.8 Years
What presented with limited space, a hydronic heating system can be installed vertically. -
CORRECT ANSWER False
Horizontal loop Geothermal heat pumps are used when there is less space available - CORRECT
ANSWER False
What kind of efficiency rating do gas and oil heating systems use? - CORRECT
ANSWER AFUE
Of the following sources, where does a typical home loses most heat? - CORRECT
ANSWER Cracks in walls, windows, and doors
The compressor of a heat pump system _____________ the pressure of the refrigerant,
________________ its temperature. - CORRECT ANSWER Increases, raising
The furnace/air conditioner will run for longer periods of time when the air filter is dirty. -
CORRECT ANSWER True
Exam Questions and CORRECT Answers
The circulation of air due to temperature differences in a room is called a ____________. -
CORRECT ANSWER Convective loop
After a house is built, the easiest place to insulate a house is/are _____________. - CORRECT
ANSWER Attic
What is the average cost of electricity in the US? - CORRECT ANSWER $80/MWh
Oil is sold in a particular region at $1.10/gal and natural gas at $11.47 per MCF. Given that the
oil has a heating value of 140,000 Btus/gal and natural gas of 1 MMBtu/MCF, which fuel is
cheaper to use? - CORRECT ANSWER Oil
HDD is used to estimate the amount of energy required for residential space heating during a
cool season. - CORRECT ANSWER True
What is the process in which heat is transferred through electromagnetic radiation? - CORRECT
ANSWER Radiation
Warm water rises in a lake and cold water descends. What is the name given to this process? -
CORRECT ANSWER Convection
The R-value of a composite wall is calculated by __________. - CORRECT
ANSWER adding the R-values of all layers
Most of the synthetic insulation products are poor insulation materials. - CORRECT
ANSWER False
, Oil is sold in a particular region at $1.60/gal. Its heating value is 117000 BTU/gal. What is the
heating cost per MMBTU? - CORRECT ANSWER $13.68/MMBTU
A wall is made up of the following materials: Plasterboard (R=0.45), 3.5 inches of fiberglass
(R=3.11/inch), Plywood (R=0.94), and Wood Siding (R=0.81). This wall is 11 feet long and 8
feet high. On particular day the average outside temperature is 34 degrees F. What is the R-value
that you would use to calculate the heat loss?
Recall that Heat loss = (Temp Diff * Area)/R-value (Units: BTU/h) - CORRECT
ANSWER $13.08 F sq.ft.h/BTU
Pat has 1200 ft2 of roof in his home in Pittsburgh, PA (HDD = 6,000). He is considering
upgrading the insulation from R-16 to R-22. The estimate from the contractor was $594. His
home is heated with natural gas. Last year, the average price he paid for natural gas was
$14.1/MCF. Assuming an AFUE of 82.4%, how long will it take Pat to recover his investment? -
CORRECT ANSWER 11.8 Years
What presented with limited space, a hydronic heating system can be installed vertically. -
CORRECT ANSWER False
Horizontal loop Geothermal heat pumps are used when there is less space available - CORRECT
ANSWER False
What kind of efficiency rating do gas and oil heating systems use? - CORRECT
ANSWER AFUE
Of the following sources, where does a typical home loses most heat? - CORRECT
ANSWER Cracks in walls, windows, and doors
The compressor of a heat pump system _____________ the pressure of the refrigerant,
________________ its temperature. - CORRECT ANSWER Increases, raising
The furnace/air conditioner will run for longer periods of time when the air filter is dirty. -
CORRECT ANSWER True
