EGEE – Exam 3 – Energy and Environmental Engineering –
study material
2. What is the physical meaning of coefficient of performance? (2 Points)
A. It is the amount of work needed to produce one unit of heat
B. It is the amount of work required to move one unit of heat between the reservoirs
C. It is the amount of heat needed to produce one unit of work
D. It is the amount of heat moved between the reservoirs for every unit of work done - ANS ✔✔D
3. If a heat pump is used to heat a house in the winter, how will the Coefficient of Performance be
affected if the inside set temperature is changed from 70 oF to 65 oF? (2 Points)
A. it decreases
B. it stays the same
C. it increases
D. it may become negative - ANS ✔✔C
T OR F: Ground Source heat pumps are more efficient than air to air heat pumps. (2 Points) - ANS
✔✔True
Opening the drapes of windows on which side of a house helps in heating? (2 Points)
A. south
B. east
C. north
D. west - ANS ✔✔A
Which one of the following items is used in a passive solar heating system? (2 Points)
A. Photo-voltaic Cells
B. South facing windows
C. A Geothermal Heat Pump
,D. Flat Plate Collectors - ANS ✔✔B
Flat plate collectors are usually placed on the roof or on the ground where there is sunlight. Such
collectors are classified as _______. (2 Points)
A. Passive Systems
B. Hybrid Systems
C. Active Systems - ANS ✔✔C
T OR F: Solar and GHP heating systems have absolutely no impact on the environment. - ANS ✔✔False
What happens when the outside temperature falls below the 'Balance Point'? (2 Points)
A. the home heating requirement equals the heat pump output
B. the home heating requirement falls below the heat pump output
C. the heat pump output falls below the home heating requirement - ANS ✔✔C. the heat pump
output falls below the home heating requirement
Which of the following defines 'Balance Point'?
A. the home heating requirement equals the heat pump output
B. the home heating requirement falls below the heat pump output
C. the heat pump output falls below the home heating requirement - ANS ✔✔A. the home heating
requirement equals the heat pump output
In heating mode, when the refrigerant liquid moves past the expansion valve it ______.
A. evaporates, giving off heat to the outside
B. condenses, absorbing heat from the outside
C. evaporates, absorbing heat from the outside
D. condenses, giving off heat to the outside - ANS ✔✔C. evaporates, absorbing heat from the outside
AFUE stands for _____. (2 Points)
A. After Fuel Utilization
, B. Annual Fuel Utilization Efficiency
C. All Fuel Utilization
D. American Fuel Utilization Efficiency - ANS ✔✔B. Annual Fuel Utilization Efficiency
13. What kind of efficiency rating do gas and oil heating systems use? (2 Points)
A. COP
B. EF
C. AFUE
D. EER - ANS ✔✔C. AFUE
T OR F: 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 鋳 ime-of-use� rates - ANS ✔✔False- heats
through radiation
What is the process by which forced-air furnace systems distribute heat? (2 Points)
A. Conduction
B. Convection
C. Radiation
D. None of the above - ANS ✔✔B. Convection
T or F: When using a fire place, most of the heated air is lost through the chimney. - ANS ✔✔True
One of the heating systems we talked about in this course comprises of a system of ducts. What is the
process by which heat is transferred in this system?
A. Conduction
B. Convection
C. Radiation
D. None of the above - ANS ✔✔B. Convection
study material
2. What is the physical meaning of coefficient of performance? (2 Points)
A. It is the amount of work needed to produce one unit of heat
B. It is the amount of work required to move one unit of heat between the reservoirs
C. It is the amount of heat needed to produce one unit of work
D. It is the amount of heat moved between the reservoirs for every unit of work done - ANS ✔✔D
3. If a heat pump is used to heat a house in the winter, how will the Coefficient of Performance be
affected if the inside set temperature is changed from 70 oF to 65 oF? (2 Points)
A. it decreases
B. it stays the same
C. it increases
D. it may become negative - ANS ✔✔C
T OR F: Ground Source heat pumps are more efficient than air to air heat pumps. (2 Points) - ANS
✔✔True
Opening the drapes of windows on which side of a house helps in heating? (2 Points)
A. south
B. east
C. north
D. west - ANS ✔✔A
Which one of the following items is used in a passive solar heating system? (2 Points)
A. Photo-voltaic Cells
B. South facing windows
C. A Geothermal Heat Pump
,D. Flat Plate Collectors - ANS ✔✔B
Flat plate collectors are usually placed on the roof or on the ground where there is sunlight. Such
collectors are classified as _______. (2 Points)
A. Passive Systems
B. Hybrid Systems
C. Active Systems - ANS ✔✔C
T OR F: Solar and GHP heating systems have absolutely no impact on the environment. - ANS ✔✔False
What happens when the outside temperature falls below the 'Balance Point'? (2 Points)
A. the home heating requirement equals the heat pump output
B. the home heating requirement falls below the heat pump output
C. the heat pump output falls below the home heating requirement - ANS ✔✔C. the heat pump
output falls below the home heating requirement
Which of the following defines 'Balance Point'?
A. the home heating requirement equals the heat pump output
B. the home heating requirement falls below the heat pump output
C. the heat pump output falls below the home heating requirement - ANS ✔✔A. the home heating
requirement equals the heat pump output
In heating mode, when the refrigerant liquid moves past the expansion valve it ______.
A. evaporates, giving off heat to the outside
B. condenses, absorbing heat from the outside
C. evaporates, absorbing heat from the outside
D. condenses, giving off heat to the outside - ANS ✔✔C. evaporates, absorbing heat from the outside
AFUE stands for _____. (2 Points)
A. After Fuel Utilization
, B. Annual Fuel Utilization Efficiency
C. All Fuel Utilization
D. American Fuel Utilization Efficiency - ANS ✔✔B. Annual Fuel Utilization Efficiency
13. What kind of efficiency rating do gas and oil heating systems use? (2 Points)
A. COP
B. EF
C. AFUE
D. EER - ANS ✔✔C. AFUE
T OR F: 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 鋳 ime-of-use� rates - ANS ✔✔False- heats
through radiation
What is the process by which forced-air furnace systems distribute heat? (2 Points)
A. Conduction
B. Convection
C. Radiation
D. None of the above - ANS ✔✔B. Convection
T or F: When using a fire place, most of the heated air is lost through the chimney. - ANS ✔✔True
One of the heating systems we talked about in this course comprises of a system of ducts. What is the
process by which heat is transferred in this system?
A. Conduction
B. Convection
C. Radiation
D. None of the above - ANS ✔✔B. Convection
