The deck water seal of the inert gas system（）.
A . cools the inert gas and prevents soot from entering the cargo tanks
B . acts as an emergency shutdown when inlet pressures exceed the safe working pressure
C . prevents the backflow of hydrocarbon gasses into nonhazardous areas
D . relieves sudden large overpressures in the system
相似题目
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To “shore up” the main deck for the stowage of deck cargo means to（）.
A . weld pad eyes on deck in proper position to secure the cargo
B . strengthen the main deck by placing pillars underneath it in the tween-decks
C . distribute the weight of the cargo by placing fore-and-aft planks on the main deck
D . package the cargo in wooden crates so it will not damage the deck
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The interface between the liquid seal (water) and the oil should be positioned （） possible to the bowl periphery.
A . as far as
B . as soon as
C . as close as
D . as closer a
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The purpose of the deck seal in an inert gas system is to prevent（）.
A . flammable vapors from entering machinery space
B . flue gas escaping to atmosphere
C . inert gas escaping to atmosphere
D . air entering inert gas system
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Prior to taking over the deck watch in port,the relieving officer shall not be informed by the officer in charge of the deck watch as to（）.
A . the depth of the water at the berth
B . the ship‟s draught
C . the duty of the relieving officer
D . the arrangement of anchor and the scope of the anchor chai
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The antennas of the trucks on deck are not fitted（）.
A . in
B . on
C . out
D . with
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The bearing of tailshaft sealing equipment, which adopting the oil nature circulation is hot, the reason is（）
A . the rotate speed fluctuation
B . the ventilation tube clogged
C . the main engine accelerate so fast
D . stormy wave
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The officer in charge of the deck watch in port shall not（）.
A . make rounds to inspect the ship at appropriate interals
B . take every precaution to prevent pollution of the environment by the ship
C . enter, in the bell book, all important events affecting the ship
D . offer assistance to ships or person in distre
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The heavier outboard strake of deck plating on a ship is called the deck（）.
A . stiffener
B . beam
C . stringer
D . doubler
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（）is the head of the Deck Department.
A . The Chief Officer
B . The Second officer
C . The Third Officer
D . Master
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The film of oil between the rings and the liner is not only essential for the lubrication but also （） achieving a gas seal.
A . play a great part on
B . run a role in
C . plays an important part in
D . acts as important part at
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Which of the following influences the position of the interface between the liquid seal and the oil in a purifier?（）
A、Height of the machine
B、Temperature of the liquid seal
C、Gravity disc
D、Bowl diameter
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The sealing function of the piston ring is brought about by the gas pressure above and behind the piston ring, which forces it （） against the bottom of the ring groove, and （） against the cylinder wall.
A . upwards；inwards
B . upwards；outwards
C . downwards；inwards
D . downwards；outward
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Holes in the bulwark，which allow deck water to drain into the sea，are（）.
A . doggers
B . fidleys
C . freeing ports
D . swash port
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（）is the depth of the vessel at ship’s side from the upper deck to the lowest point of the keel.
A . Extreme draft
B . Molded draft
C . Extreme depth
D . Molded depth
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The foremost part of the upper deck is called the（）.
A . forecastle
B . tweendeck
C . hatches
D . peak tank
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The SOLAS convention prescribes that in the fire fighting drill the duty engineer should start the pump and supply deck water in（） minute(s).
A . 5
B . 3
C . 2
D . 1
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When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of （）
A . insufficient lubrication
B . improper piston cooling
C . blow-by
D . overload operatio
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The main advantage of improved Simplex tailshaft seal are（）
A . the good sealing performance and the simple structure
B . the good sealing performance and the short life expectancy
C . the good sealing performance but the short life expectancy
D . the good sealing performance and the lower cost
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Sealing in pump shaft is achieved by means of the （）.
A . gasket
B . packing
C . washer
D . spring
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The（）is the intermediate deck between upper deck and the inside bottom of the vessel.
A . forcastle
B . tweendeck
C . hatches
D . peak tank
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The danger of a charged hose left unattended on deck with the nozzle open is（）.
A . the hose could burst
B . the nozzle end will whip about causing damage or injury
C . water damage to vessel's cargo or structure
D . personnel might trip over the hose
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Holes in the bulwark,Which allow deck water to drain into the sea, are（）.
A . doggers
B . fidleys
C . freeing ports
D . swash port
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The sealing rings are in four parts and pressed together around the piston rods by means of （）.
A . nuts
B . bolts
C . coil springs
D . stuffing boxe
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Black areas on the sealing surfaces of piston rings indicate＿.
A.lube oil pumping
B.rotating rings
C.gas pressure behind the ring
D.passage of hot gases
