海船船员考试轮机部三管轮模拟题6(轮机英语)
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Before being used the fuel service tank should be drained of _____.
- A.soda solution
- B.mechanical impurities
- C.ballast
- D.water and residuals
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Strainers are commonly used in hydraulic systems to _____.
- A.protect the pump from fine soluble contaminants
- B.prevent solid particles from entering the pump
- C.prevent solid particles from entering the filter
- D.protect the directional control valves
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The scavenging air ports are located at _____ that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.
- A.so a height
- B.such a height
- C.so high
- D.such high
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If emergency welding repairs must be made to the upper area of a fuel tank, the tank and/or adjacent compartments may need to be _____.
- A.gas freed
- B.inerted
- C.filled with water
- D.all of the above as necessary
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Setting a sealing equipment astern on the tailshaft can’t ____.
- A.prevent the seawater from intergrating
- B.prevent the lube oil from running out of the outside aboard
- C.strengthen the intencity of the sterntube
- D.prevent the mud and sand from entering the lube oil system
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Excessive valve lash in an auxiliary diesel engine will cause the valves to open________.
- A.later and close sooner
- B.sooner and close later
- C.sooner and close sooner
- D.later and close later
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The latent heat of evaporation is dissipated in the _____ in a compression refrigeration system.
- A.evaporator
- B.condenser
- C.expansion valve
- D.compressor
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The most critical part of the bunkering operations, which can result in an oil spill, is when the _____.
- A.hose joints are made up
- B.tanks are being topped off
- C.system is being lined up
- D.pumping operation is first started
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A butterfly valve consists basically of a disc pivoted across the bore of a ring body having the same radial dimensions as the pipe in which it is fittedAccording to the above sentence, which of the following statements is not true?
- A.The diameter of a disc is the same as the outer diameter of the pipe
- B.We can infer that the valve is opened or closed by rotating the spindle
- C.A butterfly valve comprises a disc and a ring body
- D.The profile of the butterfly valve is a ring body
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Worn out ring grooves should be _____ to standard dimension after being welded.
- A.machined
- B.bored
- C.honed
- D.drilled
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