If keep the fuel injection of main engine unchanged when ship is fouled, that will cause IThe speed of main engine to be reducedIIShip speed to be reducedIIIThe resistance torque of propeller to be increasedIVTrim at stern to increase.
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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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