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单选题
For most ship engines，the fuel is（）.
A
natural gas
B
diesel oil
C
propane
D
bunker fuel
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单选题On most diesel engines, the governor controls the output speed by （）.A
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varying the speed of the turbochargerC
adjusting the compression ratioD
changing the timing of the fuel injection camshaft
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单选题While a ship with twin screw is making a turn, in order to prevent overload, the duty engineer should （）A
reduce the fuel feeding of main engine of inner propellerB
reduce the fuel feeding of main engine of outer propellerC
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单选题Diesel engines are considered safer than gasoline engines because（）.A
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单选题（）, so they are widely used on board ship nowadays.A
Diesel engines have more advantages in comparison with gasoline enginesB
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单选题The viscosity regulator controls （） in order to provide oil at the correct viscosity for combustion.A
the engines speedB
the engines loadC
the fuel oil temperatureD
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单选题（）is not a feature of the electronic controlled engines.A
Lower fuel consumptionB
Better balanced cylinder powerC
A shorter overhaul periodD
Less smoke emission
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improve fuel economyB
increase the air charge velocityC
reduce the risk of explosionD
all of the above
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Among；the most commonlyC
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heat conduction into the injected fuel oilB
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incorrect adjustmentsB
dirty fuelC
broken fuel linesD
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单选题Prior to starting most medium-speed propulsion diesel engines, which of the procedures listed should be observed?（）A
The expansion tank should be topped offB
The thermostatic water regulating valves should be manually openedC
The fuel filters should be changedD
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单选题The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by（）A
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using it in the engineC
heating the fuel tanksD
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