The Dynamics of Fire and the Chemical Process of Burning Test Questions and Answers
What type of chemical is added to natural gas to give its distinct odor? - Answersmercaptan
If a gas leak occurred in a house and many minutes passed before someone came home and struck a
match to light a cigarette or candle, the resulting flames would be of the type? - AnswersPremixed flame
Which of the following is the first step in the ignition process that is initiated by a spark or flame? -
AnswersPiloted Ignition
Which of the following is the first step in the ignition process that is initiated by raising the temperature
by infusing a large amount of energy? - AnswersAuto-ignition
As more nitrogen (or any other inert gas) is added to a flame, the flame temperature drops and the
oxidation reactions cannot proceed fast enough to keep going and Sustain the flame. This point is known
as the_____? - AnswersLean flammability limit
Which of the following terms is defined as the rate at which a planar flame moves through a Stationary,
quiescent flammable mixture of infinite extent? - AnswersBurning velocity
Which of the following terms is defined as the rapid release of energy and increase in pressure when a
premixed flame propagates in a confined space? - AnswersExplosion
Which of the following terms is defined as a subsonic combustion? - AnswersDeflagration
Which of the following terms is defined as super-Sonic combustion? - AnswersDetonation
During the hydrogen oxidation process, the reaction of a single H atom with a stable molecule, O2,
producing two highly reactive species (OH and O) is known as a_____? - AnswersChain Branching
Reaction
, During the hydrogen oxidation process, as the OH is consumed in the formation of a stable water
molecule, it produces an H atom that can continue the chain reaction. Because this step keeps the
Overall Reaction Sequence going but does not increase the number of highly reactive species, it is called
a_____? - AnswersChain propagation reaction
The flammability limits of acetylene are from ¬¬¬¬¬_____ percent by Volume to_____ by Volume. ...? -
Answers2.5% to 81%
In North America, at what temperature are fusible plugs in acetylene cylinders designed to operate? -
Answers212 F
Which of the following gases is much lighter than air and can concentrate in the upper area of a
compartment? - AnswersHydrogen
Ethane, propane, isobutane, and, methane have what in common? - AnswersThey are Odorless
When a material is heated 10 °F to 30 °F (5 °C to 15 °C) higher than the flash point, and the ignition flame
is applied from time to time, combustion is sustained after removal of the ignition source. This
temperature is called the_____? - AnswersFire Point
Liquids are divided into classes based upon their flash point. Which of the following liquid classifications
have a flash point below 100 °F (38 °C)? - AnswersClass 1 Liquids
Liquids are divided into classes based upon their flash point. Which of the following liquid classifications
have a flash point at or above 100 °F (38 °C) but below 140°F (60 °C)? - AnswersClass 2 Liquids
Liquids are divided into classes based upon their flash point. Which of the following liquid classifications
have a flash point at or above 140 °F (60 °C)? - AnswersClass 3 Liquids
Which of the following materials has the lowest flashpoint? - Answersgas > ethyl ether > n-hexane
What type of chemical is added to natural gas to give its distinct odor? - Answersmercaptan
If a gas leak occurred in a house and many minutes passed before someone came home and struck a
match to light a cigarette or candle, the resulting flames would be of the type? - AnswersPremixed flame
Which of the following is the first step in the ignition process that is initiated by a spark or flame? -
AnswersPiloted Ignition
Which of the following is the first step in the ignition process that is initiated by raising the temperature
by infusing a large amount of energy? - AnswersAuto-ignition
As more nitrogen (or any other inert gas) is added to a flame, the flame temperature drops and the
oxidation reactions cannot proceed fast enough to keep going and Sustain the flame. This point is known
as the_____? - AnswersLean flammability limit
Which of the following terms is defined as the rate at which a planar flame moves through a Stationary,
quiescent flammable mixture of infinite extent? - AnswersBurning velocity
Which of the following terms is defined as the rapid release of energy and increase in pressure when a
premixed flame propagates in a confined space? - AnswersExplosion
Which of the following terms is defined as a subsonic combustion? - AnswersDeflagration
Which of the following terms is defined as super-Sonic combustion? - AnswersDetonation
During the hydrogen oxidation process, the reaction of a single H atom with a stable molecule, O2,
producing two highly reactive species (OH and O) is known as a_____? - AnswersChain Branching
Reaction
, During the hydrogen oxidation process, as the OH is consumed in the formation of a stable water
molecule, it produces an H atom that can continue the chain reaction. Because this step keeps the
Overall Reaction Sequence going but does not increase the number of highly reactive species, it is called
a_____? - AnswersChain propagation reaction
The flammability limits of acetylene are from ¬¬¬¬¬_____ percent by Volume to_____ by Volume. ...? -
Answers2.5% to 81%
In North America, at what temperature are fusible plugs in acetylene cylinders designed to operate? -
Answers212 F
Which of the following gases is much lighter than air and can concentrate in the upper area of a
compartment? - AnswersHydrogen
Ethane, propane, isobutane, and, methane have what in common? - AnswersThey are Odorless
When a material is heated 10 °F to 30 °F (5 °C to 15 °C) higher than the flash point, and the ignition flame
is applied from time to time, combustion is sustained after removal of the ignition source. This
temperature is called the_____? - AnswersFire Point
Liquids are divided into classes based upon their flash point. Which of the following liquid classifications
have a flash point below 100 °F (38 °C)? - AnswersClass 1 Liquids
Liquids are divided into classes based upon their flash point. Which of the following liquid classifications
have a flash point at or above 100 °F (38 °C) but below 140°F (60 °C)? - AnswersClass 2 Liquids
Liquids are divided into classes based upon their flash point. Which of the following liquid classifications
have a flash point at or above 140 °F (60 °C)? - AnswersClass 3 Liquids
Which of the following materials has the lowest flashpoint? - Answersgas > ethyl ether > n-hexane
