Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR

USCG Deck General (Set 40)

30:00

|

Question 1 of 30

Question Navigator

Correct Incorrect Pending Starred

Question 1 of 30

Tank vessel inerting refers to __________.

Browse Questions in Set 40

30 MCQs

#1 Tank vessel inerting refers to __________. #2 An inert gas system on a tanker should be used to __________. #3 On a hydrocarbon flammability chart the line which extends from 0% to 21.8% oxygen, lying tangent to the flammability range, is called the __________. #4 The maximum allowable oxygen content within the ship's cargo tanks, inert gas piping and the vapor recovery system is __________. #5 Which statement is TRUE concerning inert gas systems on tank vessels? #6 Which operation may cause the pressure in an inert tank to fall below the prescribed limits? #7 Which action must be taken when an individual cargo tank is closed off from the inert gas system by the tank isolation valve? #8 Which of the following describes excessive recirculation of inert gas? #9 Which of the following methods is used to supply inert gas from a flue gas system to the cargo tanks? #10 How does an inert gas system on a tanker function to prevent explosions in cargo tanks? #11 Where are remote readouts for oxygen concentration, pressure, and temperature of an inert gas system required to be located? #12 Coast Guard Regulations permit which of the following systems to be used for fire prevention and the simultaneous inerting of cargo tanks on tank vessels? #13 Each inert gas system gas main must have an automatic shut down valve at the outlet of the gas production plant. This valve must close automatically upon __________. #14 Vapor recovery hoses must be tested yearly at what ratio to their maximum allowable working pressure? #15 When checking the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery, the atmosphere must be sampled __________. #16 What is the combined fan discharge rate in an inert gas system is related to? #17 What happens to steam that is produced by gas burning in excess of machinery plant demand? #18 Liquefied flammable gas is defined as any flammable gas having a Reid vapor pressure exceeding how many pounds? #19 The primary hazard of liquefied petroleum gas and liquefied natural gas is __________. #20 One of the principal dangers inherent in liquefied petroleum gas is __________. #21 Upon release to the atmosphere, LFG readily __________. #22 Generally, the first action in extinguishing an LFG fire caused by escaping gas is to __________. #23 What normally helps in detecting escaping gas? #24 Why is gas-freeing rarely required for LPG cargo tanks? #25 Why is gas-freeing rarely required for LPG cargo tanks? #26 Tankers carrying cryogenic cargoes, such as LNG, are fitted with gas detector systems alarmed at 30% of the lower explosive limit. What is indicated if the gas detector alarms sounds? #27 What is the most common liquified gas cargo? #28 Flames from small leaks of LFG may be extinguished by which of the following? #29 Which of the following describes a chemical gas? #30 At what maximum gas concentration must the fixed gas detection system on a LNG ship activate an audible and visual alarm?

Question Discussion & Notes

0

Have a doubt, memory trick, or exam update? Share your insights with fellow mariners.

Loading mariner discussions...