Exam (elaborations)
EGEE 102 Final Exam Questions with solutions 2024
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Exam of 37 pages for the course EGEE at EGEE (EGEE 102 Final Exam)
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EGEE 102 Final ExamWhat is the name given to the weatherization process used in sealing cracks in
windows, doors and walls?
A ) Caulking
B ) Insulating
C ) Painting - answerA ) Caulking
Caulking is used in weatherization process used in sealing cracks in windows, doors
and walls
A house that effectively uses passive solar heating and cooling will_____.
A ) Face south and have deciduous trees growing on the south side to block heat in the
summer and allow sunlight in the winter.
B ) Have large windows on the east and west sides of the house to maximize solar
intake throughout the whole day.
C ) Have solar panels on the roof and around the house.
D ) Face east and have deciduous trees growing on the south side to block heat in the
summer and allow sunlight in the winter. - answerA ) Face south and have deciduous
trees growing on the south side to block heat in the summer and allow sunlight in the
winter.
A house that effectively uses passive solar heating and cooling will face south and have
deciduous trees growing on the south side to block heat in the summer and allow
sunlight in the winter
Using kitchen and bath exhaust fans may adversely affect the heating and cooling
requirements.
A ) TRUE
B ) FALSE - answerA ) TRUE
Use of kitchen and bath exhaust fans lead to venting out already heated or cooled from
inside the house. This increases heating and cooling requirements.
,On a summer afternoon you should keep the draperies closed on all west-facing
windows to block out the hot sun
A ) TRUE
B ) FALSE - answerA ) TRUE
On a summer afternoon you should keep the draperies closed on all west-facing
windows to block out the hot sun
The home heating and cooling system is the major residential user of energy
A ) TRUE
B ) FALSE - answerA ) TRUE
The home heating and cooling system is the major residential user of energy
What happens to the high temperature, high pressure refrigerant after it comes out of
the compressor of a heat pump (heating mode)?
A ) It evaporates in the coil, giving off heat to the inside
B ) It evaporates in the coil, absorbing heat from the inside
C ) It condenses in the coil, absorbing heat from the inside
D ) It condenses in the coil, giving off heat to the inside - answerD ) It condenses in the
coil, giving off heat to the inside
In heating mode, high temperature, high pressure refrigerant comes out of the
compressor and condenses, giving off heat to the inside
What is the process by which forced-air furnace systems distribute heat?
A ) Conduction
B ) Convection
C ) Radiation
D ) None of the above - answerB ) Convection
When air is circulated, heat is transfered by convection.
The average cost of electricity in the US is ______.
A ) $80/MWh
B ) $8.0/kWh
C ) $0.08/MWh
,D ) $0.80/kWh - answerA ) $80/MWh
Typical Electricity price is $0.08/KWH = $80.00/MWH
Which of the following is recommended to look at when purchasing a furnace
A ) Annual Fuel Utilization Efficiency
B ) Combustion Efficiency - answerA ) Annual Fuel Utilization Efficiency
Annual Fuel Utilization Efficiency
The work (energy) input to a heat pump system is at the _____.
A ) Condenser coil
B ) Expansion Valve
C ) Compressor
D ) Evaporator coil - answerC ) Compressor
The work (energy) input to a heat pump system is at the compressor
Keep the draperies and shades on your south-facing windows open during a
_____________ day to cut down energy costs.
A ) Summer
B ) Winter - answerB ) Winter
Keep the draperies and shades on your south-facing windows open during a winter day
to cut down energy costs
Nearly one half of the energy used at home is for _____.
A ) stoves
B ) Space heating and cooling
C ) refrigerators
D ) lighting - answerB ) Space heating and cooling
Nearly 47% of the energy at home is used for home heating and cooling
In a baseboard radiator _____ increase(s) the surface area, which in turn leads to more
efficient heat transfer."
, A ) Ducts
B ) Oil Heating
C ) Gas combustion
D ) Fins - answerD ) Fins
In a baseboard radiator fins increase the surface area, which in turn leads to more
efficient heat transfer.
A freezer maintains a temperature of 30ºF while the outside temperature is 75ºF. What
is the COP of the freezer cooling system?
A ) 1.67
B ) 11.8
C ) 15.6
D ) 11.5 - answerB ) 11.8
COP = Thot/(Thot-Tcold)
Tcold = 30 F = (30-32)x5/9 C = -1.11 C = -1.11 + 273 K = 271.89 K
Thot = 75 F = (75-32)x5/9 C = 23.89 C = 23.89 + 273 K = 296.89 K
COP = 296.89/(296.89-271.89) = 11.87
A heat pump (heating) with a COP of 3.3 maintains an indoor temperature of 65
degrees F. What is the outside temperature (in oF)?
A ) -94 F
B ) -45 F
C ) 94 F
D ) 45 F - answerA ) -94 F
65 oF = (65 - 32) oC = 18.33oC = 18.33 + 273 K= 291.33 K
' 3.3 = 291.33 / (291.33 - tcold)
' tcold = 291.33 - 291..3 = 203.04 K = 203.04 - 273 oC = -69.96 oC = (-69.96 x 9 /
5) + 32 oF = -93.93 oF
All of the following are examples of ways to improve energy efficiency of heating
systems, except _______.
A ) Frequently cleaning the furnace filter.
B ) Closing off rooms that aren't in use.
C ) Fixing cracks in the walls and floor.
D ) Opening the front door in winter to filter and clean warm air. - answerD ) Opening
the front door in winter to filter and clean warm air.
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