Exam (elaborations)
EGEE 102 Exam 4 Questions and Answers 100% Solved
- Course
- Institution
Exam of 5 pages for the course EGEE at EGEE (EGEE 102 Exam 4)
[Show more]
Seller
Follow
julianah420
Reviews received
Content preview
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller julianah420. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R297,59. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
73243 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy summaries for 14 years now