NFPA 921 Chapter 23 Explosion Test Questions with All Correct Answers

NFPA 921 Chapter 23 Explosion Test Questions with All Correct Answers pressure generated or released in excess of the surrounding ambient pressure - ANSWER overpressure sudden conversion of potential energy into kinetic energy with the production and release of gas under pressure - ANSWER explosion whether an explosion occurs depends on the location and concentration of diffuse fuels and on - ANSWER geometry preliminary criteria of an explosion is the ____________ and ______________ of gases - ANSWER generation / violent Escape two major types of explosions - ANSWER mechanical and chemical the rupture of a closed container cylinder tank boiler or similar strong vessel resulting in the release of pressurized gas or vapor - ANSWER mechanical explosion the type a mechanical explosion that will be encountered most frequently - ANSWER BLEVE the generation of overpressure is the result of exothermic reactions where in the fundamental chemical nature of the fuel is changed - ANSWER chemical explosion from the point of initiation chemical reactions of the type involved in explosions usually propagate in a reaction __________ way - ANSWER front way the most common of the chemical explosions are those caused by burning of - ANSWER hydrocarbon fuels chemical explosions can involve solid combustibles for explosive mixtures of fuel and oxidizer but more common to the investigator will be reactions involving gas vapors or dust mixed with air. Such combustion reactions are called ______________ reaction - ANSWER propagation combustion explosions are classified as either deflagrations or detonations depending on the velocity of the ________________ propagation through the fuel mixture - ANSWER flame front combustion reactions in which the velocity of the reaction relative to the unreacted flammables is faster than the speed of sound - ANSWER detonation