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单选题
Some vessels are equipped with a water lubricated stern robeWhen at sea, operating under normal conditions, the water service valve from the ships saltwater system to the bearing should be （）.
A
closed, and no leakage permitted across the shaft packing
B
closed, and only slight leakage permitted across the shaft packing
C
open, and no leakage permitted across the shaft packing
D
open, and only slight leakage permitted across the shaft packing
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更多 “单选题Some vessels are equipped with a water lubricated stern robeWhen at sea, operating under normal conditions, the water service valve from the ships saltwater system to the bearing should be （）.A closed, and no leakage permitted across the shaft packingB closed, and only slight leakage permitted across the shaft packingC open, and no leakage permitted across the shaft packingD open, and only slight leakage permitted across the shaft packing” 相关考题
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考题
单选题A shallow dish positioned at the normal water level is connected to the（）This enables the blowing down or removal of scum and impurities from the water surface.A
main stern stop valveB
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AIS is a short-range 3 cm X-band radar system that automatically sends a vessel's position and other safety related information to similarly equipped vessels，aircraft and shore stations within the areaC
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单选题You intend to overtake a vessel in a narrow channel.As you approach the other vessel’s stern（）A
you will gain speedB
both vessels will gain speedC
the vessels will drift togetherD
the vessels will drift apart
考题
单选题What type of stern tube bearing has the least friction（）.A
Oil-lubricated bearingsB
Lignum vitaeC
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考题
单选题Regulations require that tank vessels handling grade B liquids shall have their cargo pumps separated from all sources of vapor ignition by（）.A
cofferdamsB
empty cargo spacesC
gas tight bulkheadsD
areas equipped with power ventilation
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