Book 2 Chapter 6: Warm Air Heating System Equipment Flashcards
Which of the following are advantages of a warm air heating system?
A) A more uniform temperature distribution can be obtained due to a positive air circulation
B) Filters may be used to clean the air
C) Controlled amounts of external ventilation may be drawn into the system
D) All of the above
D) All of the above
What is the name given to the furnace type that has the return air enter the top and the supply air leave the bottom of the system?
A) Lowboy furnace
B) Downflow furnace
C) Highboy furnace
D) Horizontal furnace
B) Downflow furnace
The flue gas temperature on the heat exchanger exit of a warm air furnace is about _________.
A) 150ºC (300ºF)
B) 300ºC (570ºF)
C) 230ºC (450ºF)
D) 365ºC (690ºF)
C) 230ºC (450ºF)
Heat may be added to a building’s forced air system by means of:
A) Duct silencers
B) Electronic control
C) Dampers
D) Fin-coil heat exchangers
E) Fans
D) Fin-coil heat exchngers
In high efficiency furnaces, if the temperature of the flue gas drops below 65ºC, the:
A) Furnace burner will shut down
B) Flue gas will condense
C) Furnace burner will start up
D) Furnace vent will close
E) Water vapour will condense
E) Water vapour will condense
One of the advantages forced air heating systems has over steam or hot water heating systems is the:
A) Ease of installation of the air duct
B) Systems do not require electricity
C) Air can be humidified and filtered
D) Systems are maintenance free
E) Systems are virtually noise free
C) Air can be humidified and filtered
A pulse combination condensing furnace stated efficiency is:
A) 50-60%
B) 70-75%
C) 94-98%
D) 60-70%
E) 80-95%
C) 94-98%
Various types of heat sources are used in warm air heating systems. They can be divided into the following classes:
1. Indirectly-fired
2. Directly fired
3. Electric resistance coil
4. High voltage coil
5. Fin-coil heat exchanger
A) 2,3,4
B) 1,3,4
C) 3,4,5
D) 1,2,3
E) 2,3,5
E) 2,3,5
Three types of direct fired forced warm air furnaces are:
A) Steam unit ventilators, hot water unit ventilators, and finned hot water convection
B) Hydronic, steam, and finned electric
C) Horizontal, upflow, and Downflow
D) Dual duct, terminal reheat, and constant volume
E) Zone, direct volume and variable volume
C) Horizontal, upflow, and downflow
High efficiency warm air furnaces require:
A) Larger fans
B) Large vent stacks
C) More air
D) Condensate drains to waste
E) Increased gas pressure
D) Condensate drains to waste
In a warm air heating system, the cold air return registers are located:
A) Under windows
B) In interior locations
C) In ceilings
D) In floors
E) In exterior walls
B) In interior locations
An advantage of an electric resistance warm air furnace is:
A) Lower installation cost
B) More efficient
C) Elimination of burners and fuel
D) More compact
E) All of these are correct
E) All of these are correct
One of the advantages of a forced warm air heating system is:
A) The furnace must be located on the same floor
B) The air can not be cleaned by filters
C) The air can be humidified
D) The ducts can not be enclosed within the walls and ceilings
E) Temperature distribution is not uniform
C) The air can be humidified
In forced warm air heating system a fresh air supply duct allows a controlled amount of outside air to enter the system:
A) After it passes through the filter
B) Before it is heated
C) After the blower
D) Before it passes through the filter
E) After it is heated
D) Before it passes through the filter
One of the advantages of a forced warm air heating system is:
A) The furnace must be located on the same floor
B) The air can not be humidified
C) The air can not be cleaned by filters
D) The ducts can not be enclosed within the walls and ceilings
E) A more uniform temperature distribution can be obtained
E) A more uniform temperature distribution can be obtained
What is the name given to the furnace type that has the return air enter the bottom and the supply air leave the top of the system?
A) Lowboy furnace
B) Upflow furnace
C) Horizontal flow furnace
D) Downflow furnace
E) Highboy furnace
B) Upflow furnace
What is the name given to the furnace type that is used when headroom is limited?
A) Lowboy furnace
B) Downflow furnace
C) Highboy furnace
D) Upflow furnace
E) Horizontal flow furnace
A) Lowboy furnace
One of the disadvantages of a forced warm air heating system is:
A) The ducts can be enclosed within walls and ceilings
B) The air may be cleaned by filters
C) They can be quite noisy if not properly designed
D) A more uniform temperature distribution can be obtained
E) The air can be humidified
C) They can be quite noisy if not properly designed
One of the advantages of a forced warm air heating system is:
A) The air can not be cleaned by filters
B) Temperature distribution is not uniform
C) The air can not be humidified
D) The ducts can not be enclosed within walls and ceilings
E) The furnace may be located in any part of the building
E) The furnace may be located in any part of the building
The rooftop heating unit is basically a _________ air heater mounted on the roof.
A) Vertical
B) Duct
C) Horizontal
D) Lowboy
E) Highboy
C) Horizontal
By passing the combustion gases through a secondary exchanger more heat is transferred to the air so the temperature of the gases drop to about:
A) 100ºC (212ºF)
B) 50ºC (122ºF)
C) 150ºC (300ºF)
D) 230ºC (450ºF)
E) 65ºC (150ºF)
E) 65ºC (150ºF)
The term space heater is generally applied to a fired heater which is installed in the space to be heated and heats the air directly without the use of:
A) Any ducting
B) A combustion chamber
C) Steam or water
D) An open flame
E) A blower
A) Any ducting
