#1
Which of the following is a primary function of a heating system?
Cooling the indoor environment
Regulating humidity levels
Providing warmth to the indoor environment
Purifying indoor air
#2
What is the typical fuel source used in combustion furnaces?
Electricity
Natural gas
Solar energy
Geothermal energy
#3
Which component of a furnace is responsible for igniting the fuel-air mixture?
Thermostat
Heat exchanger
Pilot light or igniter
Combustion chamber
#4
What does AFUE stand for in the context of heating systems?
Annual Fuel Utilization Efficiency
Automatic Furnace Efficiency
Advanced Furnace Utilization Energy
Annual Furnace Usage Estimation
#5
What is the purpose of a heat exchanger in a furnace?
To regulate the flow of air
To ignite the fuel-air mixture
To transfer heat from the combustion process to the air
To filter out impurities from the air
#6
What is the primary function of a flue in a combustion furnace?
To supply combustion air
To remove combustion byproducts
To regulate fuel flow
To control heat output
#7
What does the term 'stack effect' refer to in the context of heating systems?
The process of chimney cleaning
The movement of air through a building due to temperature differences
The adjustment of thermostat settings
The operation of the flue damper
#8
Which of the following is NOT a common type of furnace ignition system?
Pilot light
Hot surface ignition
Direct spark ignition
Thermostat ignition
#9
What role does a flame sensor play in the operation of a furnace?
Regulating the fuel flow
Monitoring the temperature inside the furnace
Detecting the presence of a flame
Controlling the blower motor
#10
Which factor primarily affects the efficiency of a combustion furnace?
Size of the furnace
Type of insulation used
Air filtration system
Combustion air-to-fuel ratio
#11
Which type of furnace operates with the highest efficiency?
Single-stage furnace
Two-stage furnace
Modulating furnace
Gravity furnace
#12
What is the main advantage of a modulating furnace over a single-stage furnace?
Higher initial cost
Increased energy efficiency
Simpler maintenance
Shorter lifespan
#13
Which factor can negatively impact the efficiency of a furnace over time?
Regular maintenance
Replacing air filters frequently
Using high-quality fuel
Accumulation of soot and debris in the heat exchanger
#14
Which of the following is a potential consequence of inefficient combustion in a furnace?
Increased energy savings
Reduced indoor air quality
Enhanced heating performance
Extended furnace lifespan
#15
What is the purpose of a draft inducer in a furnace?
To regulate the flow of fuel
To ignite the fuel-air mixture
To create proper airflow for combustion
To monitor temperature levels
#16
What is the purpose of a secondary heat exchanger in a high-efficiency furnace?
To increase airflow
To extract additional heat from combustion gases
To regulate temperature settings
To filter out dust particles