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EGEE 102 Exam 4 Questions and Answers 100% Solved
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Exam of 5 pages for the course EGEE at EGEE (EGEE 102 Exam 4)
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EGEE 102 Exam 4The circulation of air due to temperature differences in a room is called a
____________. - answerConvective loop
After a house is built, the easiest place to insulate a house is/are _____________. -
answerAttic
What is the average cost of electricity in the US? - 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? - answerOil
HDD is used to estimate the amount of energy required for residential space heating
during a cool season. - answerTrue
What is the process in which heat is transferred through electromagnetic radiation? -
answerRadiation
Warm water rises in a lake and cold water descends. What is the name given to this
process? - answerConvection
The R-value of a composite wall is calculated by __________. - answeradding the R-
values of all layers
Most of the synthetic insulation products are poor insulation materials. - answerFalse
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? - 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) - 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? - answer11.8 Years
What presented with limited space, a hydronic heating system can be installed
vertically. - answerFalse
Horizontal loop Geothermal heat pumps are used when there is less space available -
answerFalse
What kind of efficiency rating do gas and oil heating systems use? - answerAFUE
Of the following sources, where does a typical home loses most heat? - answerCracks
in walls, windows, and doors
The compressor of a heat pump system _____________ the pressure of the refrigerant,
________________ its temperature. - answerIncreases, raising
The furnace/air conditioner will run for longer periods of time when the air filter is dirty. -
answerTrue
Which one of the following is not an advantage of forced air heating systems? -
answerThey usually have a very high efficiency (80-90%)
Thermal-lined draperies and outdoor awnings can significantly reduce the energy
required for air conditioning. - answerTrue
The home heating and cooling system is the major residential user of energy -
answerTrue
Which of the following is/are true about a geothermal heat pump? - answer- it provides
reduced or free hot water
- it requires little maintenance
- it saves energy and is environmentally friendly
If a heat pump is used to heat a house in the winter, how will the Coefficient of
Performance be affected as the outside temperature drops? - answerit decreases
A freezer maintains a temperature of 30F while the outside temperature is 75F. What is
the COP of the freezer cooling system? - answer11.8
A "desuperheater" can provide a homeowner with ______. - answerfree or reduced cost
hot water
Which of the following is recommended to look at when purchasing a furnace -
answerAnnual Fuel Utilization Efficiency
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