Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Safety & Environmental Protection (Deck) (Set 21)
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Question 1 of 30
Fires in combustible metals, such as sodium or magnesium, are classified as class __________.
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30 MCQs #1 Fires in combustible metals, such as sodium or magnesium, are classified as class __________. #2 Fires are grouped into what categories? #3 You are testing a tank that contained gasoline by using a combustible gas indicator. Under testing, the tank sample caused the needle to move rapidly to 100 on the dial then fall to zero. What is the concentration of flammable gas? #4 A combustible gas indicator meter is calibrated to read the percentage of __________. #5 Combustible gas indicators measure the presence of combustible gas as a percentage of the __________. #6 When using the combustible gas indicator, a special filter for filtering the incoming sample must be used if the atmosphere being tested contains vapors of __________. #7 Which instrument is suitable for determining the presence of explosive concentrations of fuel oil vapors in tanks? #8 What is the best instrument for establishing a safe working area before welding in a confined space? #9 An oxygen indicator can be used to determine if there is __________. #10 The oxygen indicator is an instrument that measures the __________. #11 What could result in an incorrect oxygen concentration reading on the oxygen indicator? #12 Which statement is TRUE concerning the oxygen indicator? #13 What can be used to measure the percentage of oxygen inside a chain locker? #14 Deficient oxygen content inside a chain locker can be detected with __________. #15 Ambient air, which you normally breathe, contains what percent of oxygen? #16 After each reading of an oxygen indicator, the instrument should be purged with __________. #17 When using the oxygen indicator, which reaction from the needle should you expect as a sample is drawn into the instrument? #18 You are using an oxygen indicator. How long should you wait after the sample is drawn into the instrument before reading the meter? #19 If the meter needle of the oxygen indicator cannot be set to zero, what should be done? #20 What is used to test a tank for oxygen content? #21 Combustible gas indicators operate by drawing an air sample into the instrument __________. #22 Before entering the chain locker, you should __________. #23 What can cause a lack of oxygen in a chain locker? #24 Deficient oxygen content inside a chain locker can be detected with __________. #25 Which fire detection system is actuated by sensing a heat rise in a compartment? #26 Fire alarm system thermostats are actuated by __________. #27 Some spaces protected by fixed carbon dioxide systems are required to have audible alarms that begin sounding prior to the discharge of CO2. This time delay must be at least __________. #28 The CO2 flooding system is actuated by a sequence of steps which are __________. #29 The danger associated with using carbon dioxide in an enclosed space is __________. #30 There are two disadvantages to CO2 as a firefighting agent. One of these is the limited quantity available, and the other is __________.
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