單項選擇題Trunk type diesel engine pistons are effectively cooled when heat is()

A.radiated through the engine block
B.transferred to water cooled cylinder walls
C.conducted through the piston crown
D.transferred to escaping exhaust gases


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1.單項選擇題Maintaining the proper fuel oil temperature will result in ()

A.the elimination of valve wear
B.improved atomization
C.a decrease in cylinder blow-by
D.an increase in cylinder blow-by

2.單項選擇題Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as()

A.supercharging
B.scavenging
C.turbulence
D.swept volume charging

3.單項選擇題Which of the following statements is correct concerning diesel engine cooling water systems?()

A.Each engine must have its own engine driven cooling water pump capable of providing cooling for all ranges of operation
B.propulsion engines with bores exceeding 200 mm are to be fitted with a means to display the cooling water temperature of each cylinder
C.At least two independent sea suctions are to be provided for supplying water to the engine jackets or to the heat exchangers
D.Suitable strain are to be fitted between the circulating pumps and heat exchangers when sea water is used for direct cooling

4.單項選擇題In a full flow type lube oil system, the bypass relief valve will lift due to ()

A.a clogged filter element
B.excessive lube oil pump discharge pressure
C.excessive lube oil flow
D.excessively hot lube oil

5.單項選擇題In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by ()

A.improper venting of the cooling system
B.carrying the expansion tank water level too high
C.a totally clogged impeller in the cooling water pump
D.an incorrectly set cooling system temperature control

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The shipboard oil pollution emergency plan will be invalid after ()

題型:單項選擇題

A purge recovery system is used in a centrifugal air conditioning or refrigeration system to ()

題型:單項選擇題

Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?()

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Using a file without a handle may result in ()

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Flame failure in an automatically fired auxiliary boiler can from a/an ()

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During the diesel engine running, the water level of F.W expansion tank should normally kept in the () level of glass tube.

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The additional mark ()in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.

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The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the()

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For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?()

題型:單項選擇題