#1
Which of the following is a primary requirement for combustion to occur?
Oxygen
ExplanationCombustion requires oxygen as a primary reactant.
#2
What is the most common type of fuel used in heating systems?
Natural Gas
ExplanationNatural gas is the predominant fuel choice for heating systems.
#3
Which of the following is a characteristic of complete combustion?
Formation of water and carbon dioxide
ExplanationComplete combustion results in the formation of water and carbon dioxide as the main byproducts.
#4
What is the purpose of a flue in a heating system?
To exhaust combustion byproducts
ExplanationThe flue removes combustion byproducts from the heating system.
#5
Which of the following gases is a common byproduct of incomplete combustion?
Carbon monoxide
ExplanationIncomplete combustion often produces carbon monoxide as a byproduct.
#6
Which of the following is NOT a component of the fire triangle?
Exhaust
ExplanationExhaust is not a component of the fire triangle, which comprises fuel, heat, and oxygen.
#7
What is the term used to describe the minimum temperature to which a fuel must be heated before combustion can occur without a flame?
Autoignition Temperature
ExplanationAutoignition Temperature is the minimum temperature for flameless combustion of a fuel.
#8
What is the role of a burner in a heating system?
To ignite the fuel-air mixture
ExplanationThe burner ignites the fuel-air mixture to initiate combustion in a heating system.
#9
What is the primary factor that influences the efficiency of combustion in a heating system?
Fuel type
ExplanationThe efficiency of combustion is primarily influenced by the type of fuel used.
#10
What is the primary purpose of a combustion air supply in a heating system?
To provide oxygen for combustion
ExplanationThe combustion air supply furnishes oxygen necessary for combustion in a heating system.
#11
Which of the following combustion processes is considered the most efficient?
Complete Combustion
ExplanationComplete combustion is the most efficient combustion process, producing water and carbon dioxide as byproducts.
#12
What is the term for the ratio of the heat output of a heating system to the heat input?
Efficiency
ExplanationEfficiency is the ratio of heat output to heat input in a heating system.
#13
What is the term used to describe the process of reducing the temperature of combustion gases before they are released into the environment?
Flue gas recirculation
ExplanationFlue gas recirculation reduces the temperature of combustion gases before release into the environment.
#14
Which of the following combustion processes is commonly used in internal combustion engines?
Compression ignition combustion
ExplanationCompression ignition combustion is commonly used in internal combustion engines.
#15
What is the term used to describe the process of heating a solid material to the point where it releases volatile gases that can be burned?
Pyrolysis
ExplanationPyrolysis involves heating a solid material to release volatile gases for combustion.