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WorksheetsHeating 101
Total questions: 15
Worksheet time: 8mins
When a coffee cup gets warm when hot coffee is poured in, it represents heat transfer by _____.
conduction
capillary action
convection
radiation
When you become warm while sitting some distance from a fire, heat is being transferred by _____.
combustion
conduction
radiation
convection
A temperature of 140°F is equal to _____.
202°C
12°C
60°C
133°C
Humidifiers are used to _____.
lower the room temperature
reduce condensation
keep furniture dry
add moisture to the air
Carbon monoxide (CO) is produced when _____.
there is excess air in the combustion chamber
incomplete combustion is present
oil and oxygen are mixed
there is too much water vapor in the flue gas
A yellow flame in a gas burner indicates that _____.
incomplete combustion is at work
there is too much primary air
there is too much secondary air
a proper amount of combustion air is present
Most calculations regarding the capacity of gas piping are based on natural gas having a heat content of _____.
1,800 Btus/ft³
750 Btus/ft³
1500 Btus/ft³
1000 Btus/ft³
Figure RQ01
Which furnace configuration is represented in Figure RQ01?
Horizontal
Counterflow
Upflow
Lowboy
In a condensing furnace, the secondary heat exchanger _____.
is used to reheat the flue gases before they are vented
extracts heat by condensing moisture from the flue gases
is used only for room-air dehumidification
extracts heat by cooling the room air that passes over it
The type of blower used to circulate room air through a furnace is a(n) _____.
centrifugal blower wheel with forward-curved blades
axial fan
centrifugal blower wheel with backward-curved blades
propeller fan
Venting of the flue gases through PVC pipe is an option _____.
for all furnaces with an induced-draft blower
for any furnace not connected to a masonry chimney
only for natural-draft furnaces
only for condensing furnaces
A manometer is used to measure _____.
the ratio of combustion primary air to secondary air
the gas pressure in the manifold
the volume of water is in the flue gas
the flame rectification current
Sectional heat exchangers in a large boiler are usually constructed from _____.
steel
finned copper tubes
cast iron
stainless steel
The typical pressure setting from the factory for a makeup water valve is _______.
100 psig
12 psig
30 psig
45 psig
The actual heating output of an electric heating element largely depends on the _____.
the temperature of the return air stream
voltage provided
the relative humidity of the return air stream
temperature difference of the return and supply air streams
