4A Unit 4 Questions and Answers Graded A+

4A Unit 4 Questions and Answers Graded A+ The type of standpipe system that requires a supplemental detection system to operate is the: Select one: a. Dry Pipe b. Wet Pipe c. Deluge System d. Preaction d. Preaction (4-039-1.1) Overheating of electrical equipment is: Select one: a. Is one of the conditions that usually cause electrical fires in buildings b. Usually the result of inadequate wiring c. Often due to over sized fuses being installed d. The result of blocked cooling fin passages a. Is one of the conditions that usually cause electrical fires in buildings (4-037-2.9) Aqueous film forming foam agents extinguish a fire by: Select one: a. Breaking the chain reaction b. Cooling and smothering c. Sealing vapours, and cooling d. Sealing vapours, cooling, and removing oxygen b. Cooling and smothering (4-034-1.5) The ignition temperature of a fuel/air mixture is the: Select one: a. Lowest temperature at which a mixture will burn. b. Temperature at which it becomes a lean mixture. c. Highest mixture temperature before the fuel turns to vapour. d. Temperature at which the mixture is above the boiling point. a. Lowest temperature at which a mixture will burn. (4-038-1.12) What type of fire should be put out with water? Select one: a. Class "A" b. Class "B" c. Class "C" d. Class "A", "B", and "C" a. Class "A" (4-029-1.3) Which one of these statements is true?: Select one: a. The attitude of an injured worker has no impact on the outcome of his injury. b. Financial costs of a workplace injury outweigh all other costs c. A workplace injury can destroy an employee's self esteem d. An injured worker usually causes his own injury. c. A workplace injury can destroy an employee's self esteem Confined spaces include the following, except for: Select one: a. Deaerators b. Boilers c. MCC room d. stacks c. MCC room (4-033-3.2) To prevent the formation of explosive mixtures, oxygen and acetylene cylinders should be: Select one: a. Equipped with different thread connectors b. Stored outside c. Stored in separate areas d. Regularly hydro-tested c. Stored in separate areas (4-034-1.1) If a fuel-air mixture is below the lower flammable limit, the mixture: Select one: a. Is said to be lean b. Is explosive