Question 1

Infiltration can be reduced primarily by ________.

Accepted Answer

A)  insulation 
B)  double pane windows 
C)  weatherstripping 
D)  lowering the thermostat 
E)  furnace maintenance 
A)  insulation 
B)  double pane windows 
C)  weatherstripping 
D)  lowering the thermostat 
E)  furnace maintenance

Question 2

As a liquid changes into a vapor ________.

Accepted Answer

A)  heat energy is absorbed 
B)  heat energy is given off 
C)  the temperature of the liquid rises substantially 
D)  the specific heat maintains the temperature 
A)  heat energy is absorbed 
B)  heat energy is given off 
C)  the temperature of the liquid rises substantially 
D)  the specific heat maintains the temperature

Question 3

The temperature on an Oswego, New York "warm" spring day has a maximum of 64$\degree$F and a minimum of 30$\degree$F. What is the number of heating degree days?

Accepted Answer

A)  18 
B) 30 
C)  34 
D)  47 
E)  64 
A)  18 
B) 30 
C)  34 
D)  47 
E)  64

Question 4

If the R-value of a wall is 10 ft2-˚F-hr/Btu, then the rate of heat transfer through a 2 ft - 3 ft section of wall, with $\Delta$T = 50 $\degree$F, will be:

Accepted Answer

A)  10 
B)  30 
C)  500 
D)  3000 
E)  10,000 Btu/hr 
A)  10 
B)  30 
C)  500 
D)  3000 
E)  10,000 Btu/hr

Question 5

Materials A, B, and C have R values of 1, 4, and 8 ft2-$\degree$F-hr/Btu, respectively. If the rate of heat transfer through material A alone is 20 Btu/hr, then the rate of heat transfer through the combination of A, B and C is _____.

Accepted Answer

A)  1.5 
B)  2.5 
C)  4.0 
D)  7.0 
E)  80 Btu/hr 
A)  1.5 
B)  2.5 
C)  4.0 
D)  7.0 
E)  80 Btu/hr

Question 6

The cooling effect in a refrigerator is produced by _____.

Accepted Answer

A)  the electric motor which essentially converts electricity into heat 
B)  compression of the refrigeration gas into a liquid 
C)  liquefying the refrigeration gas 
D)  vaporization of the refrigeration liquid 
E)  proper insulation 
A)  the electric motor which essentially converts electricity into heat 
B)  compression of the refrigeration gas into a liquid 
C)  liquefying the refrigeration gas 
D)  vaporization of the refrigeration liquid 
E)  proper insulation

Question 7

An object with a high specific heat will ________.

Accepted Answer

A)  lose its heat very fast 
B)  decrease in temperature quite fast if removed from the heat source 
C)  take considerably more heat to raise its temperature 
D)  always be water 
A)  lose its heat very fast 
B)  decrease in temperature quite fast if removed from the heat source 
C)  take considerably more heat to raise its temperature 
D)  always be water

Question 8

When ice crystals form in the clouds, ________.

Accepted Answer

A)  heat energy is released 
B)  the atmosphere becomes colder 
C)  phase change from solid to liquid occurs 
D)  the thermal mass of the atmosphere increases 
A)  heat energy is released 
B)  the atmosphere becomes colder 
C)  phase change from solid to liquid occurs 
D)  the thermal mass of the atmosphere increases

Question 9

A heat pump will have an efficiency (heat out to electrical in) of about ________.

Accepted Answer

A)  35% 
B)  50% 
C)  75% 
D)  100% 
E)  200% 
A)  35% 
B)  50% 
C)  75% 
D)  100% 
E)  200%

Question 10

Running a clothes dryer for 90 minutes at 800 Watts will cost about ______ cents if the cost of electricity is 7 cents per kWh:

Accepted Answer

A)  4 
B)  10 
C)  24 
D)  50 
E)  120 
A)  4 
B)  10 
C)  24 
D)  50 
E)  120

Question 11

A heat engine ________.

Accepted Answer

A)  converts work into heat energy 
B)  needs a temperature difference to be able to work 
C)  can be 100% efficient in the absence of friction 
D)  needs electricity to be able to run 
A)  converts work into heat energy 
B)  needs a temperature difference to be able to work 
C)  can be 100% efficient in the absence of friction 
D)  needs electricity to be able to run

Question 12

Infiltration in a house will ________.

Accepted Answer

A)  increase on windy days 
B)  raise the heating load by about 10% 
C)  reduce the number of air changes 
D)  be increased by caulking around windows 
A)  increase on windy days 
B)  raise the heating load by about 10% 
C)  reduce the number of air changes 
D)  be increased by caulking around windows

Question 13

The predominant method of heat transfer to a cold drink held in an evacuated bottle (a thermos)
Is by ________.

Accepted Answer

A)  conduction 
B)  convection 
C)  radiation 
A)  conduction 
B)  convection 
C)  radiation

Infiltration can be reduced primarily by ________.

As a liquid changes into a vapor ________.

The temperature on an Oswego, New York "warm" spring day has a maximum of 64 $\degree$ F and a minimum of 30 $\degree$ F. What is the number of heating degree days?

If the R-value of a wall is 10 ft2-˚F-hr/Btu, then the rate of heat transfer through a 2 ft - 3 ft section of wall, with $\Delta$ T = 50 $\degree$ F, will be:

Materials A, B, and C have R values of 1, 4, and 8 ft2- $\degree$ F-hr/Btu, respectively. If the rate of heat transfer through material A alone is 20 Btu/hr, then the rate of heat transfer through the combination of A, B and C is _____.

The cooling effect in a refrigerator is produced by _____.

An object with a high specific heat will ________.

When ice crystals form in the clouds, ________.

A heat pump will have an efficiency (heat out to electrical in) of about ________.

Running a clothes dryer for 90 minutes at 800 Watts will cost about ______ cents if the cost of electricity is 7 cents per kWh:

A heat engine ________.

Infiltration in a house will ________.

The predominant method of heat transfer to a cold drink held in an evacuated bottle (a thermos) Is by ________.

Introduction

Energy Mechanics

Solar Energy

Air Pollution, Global Warming, and Fossil Fuels

Electricity

Nuclear

Biomass

Filters

Exam 3: Heat

Infiltration can be reduced primarily by ________.

As a liquid changes into a vapor ________.

The temperature on an Oswego, New York "warm" spring day has a maximum of 64 °\degree° F and a minimum of 30 °\degree° F. What is the number of heating degree days?

If the R-value of a wall is 10 ft2-˚F-hr/Btu, then the rate of heat transfer through a 2 ft - 3 ft section of wall, with Δ\DeltaΔ T = 50 °\degree° F, will be:

Materials A, B, and C have R values of 1, 4, and 8 ft2- °\degree° F-hr/Btu, respectively. If the rate of heat transfer through material A alone is 20 Btu/hr, then the rate of heat transfer through the combination of A, B and C is _____.

The cooling effect in a refrigerator is produced by _____.

An object with a high specific heat will ________.

When ice crystals form in the clouds, ________.

A heat pump will have an efficiency (heat out to electrical in) of about ________.

Running a clothes dryer for 90 minutes at 800 Watts will cost about ______ cents if the cost of electricity is 7 cents per kWh:

A heat engine ________.

Infiltration in a house will ________.

The predominant method of heat transfer to a cold drink held in an evacuated bottle (a thermos) Is by ________.

Introduction

Energy Mechanics

Solar Energy

Air Pollution, Global Warming, and Fossil Fuels

Electricity

Nuclear

Biomass

Filters

The temperature on an Oswego, New York "warm" spring day has a maximum of 64 $\degree$ F and a minimum of 30 $\degree$ F. What is the number of heating degree days?

If the R-value of a wall is 10 ft2-˚F-hr/Btu, then the rate of heat transfer through a 2 ft - 3 ft section of wall, with $\Delta$ T = 50 $\degree$ F, will be:

Materials A, B, and C have R values of 1, 4, and 8 ft2- $\degree$ F-hr/Btu, respectively. If the rate of heat transfer through material A alone is 20 Btu/hr, then the rate of heat transfer through the combination of A, B and C is _____.