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发布时间:2023-09-29 20:01:45

[单项选择]Carbon dioxide flooding system is used for extinguishing fires because it reduces the concentration of oxygen in the air to().
A. flashing point
B. combustion point
C. auto-ignition point
D. lower explosive limit

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[单项选择]The supply of carbon dioxide used in the fixed extinguishing system aboard a cargo vessel MUST be at least sufficient for().
A. all the spaces of a vessel
B. all cargo spaces
C. the engine room and largest cargo space
D. the space requiring the largest amount
[单项选择]The part of the shipboard electrical system used to control the distribution of power to the branch circuits, is the ().
A. bridge control panel
B. disconnect links
C. governor relay box
D. main switchboard
[单项选择]The component in an inert gas system used for cleaning the gas of solid and sulphur combustion products,while simultaneously cooling the inert gas,is called the().
A. filter
B. cooler
C. scrubber
D. purifier
[单项选择]What is NOT a securing system used on a containership?().
A. Lashing system
B. Stacking system
C. Locking system
D. Buttress system
[单项选择]Controls for a fixed carbon dioxide system shall be mounted().
A. directly outside the space protected by the system
B. as near the gas cylinders as possible
C. in the pilothouse
D. on the main deck near the bow
[单项选择]A fixed carbon dioxide extinguishing system for a machinery space,designed WITHOUT a stop valve in the line leading to the protected space,is actuated by().
A. one control
B. two controls
C. three controls
D. none of the above
[单项选择]A separate piston cooling system is used to limit any contamination () piston cooling glands() the piston cooling system only.
A. between;to
B. either;or
C. from;to
D. neither;nor
[单项选择]A separate piston cooling system is used () any contamination from piston cooling glands to the piston cooling system only.
A. to help
B. to limit
C. to protect
D. to remove
[单项选择]The Consol navigation system,used in Russian and Northern European waters,can be used().
A. for precise navigation in coastal waters
B. by measuring the phase difference of the dots and dashes
C. as an aid to ocean navigation
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[单项选择]A purge recovery system is used in a centrifugal air conditioning or refrigeration system to ()
A. purge lube oil from the liquid refrigerant
B. recover water purged from the system
C. separate foul gases from the receiver
D. purge non-condensable gases without losing refrigerant
[单项选择]In a central cooling system, used in some modem ships, sea water is supplied to cool ()which will circulate to other individual cooler, greatly reducing the corrosion problems.
A. fresh water
B. sea water
C. cooling oil
D. emulsion
[单项选择]A permanent chain chasing system is used to().
A. clean anchor chain as it's hauled in
B. recover anchors which have lost their buoys
C. run and retrieve anchors
D. prepare anchor chain for inspection
[单项选择]Which is a disadvantage of Halon as a fire extinguishing medium?()
A. Conducts electricity
B. Difficult to store
C. Large volume necessary to be effective
D. Ineffective in powdered metal fires
[单项选择]When used to fight fire,carbon dioxide().
A. is effective if used promptly on an oil fire
B. has a greater cooling effect than water
C. is lighter than air
D. is harmless to cargo and crew
[单项选择]The sprinkler system of a survival craft is used to().
A. cool the craft in a fire
B. cool the engine
C. spray oil on the sea to calm it
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[单项选择]The two most common gases used in pneumatic system are ()
A. compressed air and nitrogen
B. helium and nitrogen
C. oxygen and hydrogen
D. oxygen and acetylene
[单项选择]()can be used to prevent hydraulic system overloaded or keep the pressure of oil outlet from pump constant.
A. Overflow valve
B. Reducing valve
C. Balancing valve
D. Reducing valve or balancing valve

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