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單項選擇題

What color exhaust will be exhibited when a slow speed two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?（）

A.White
B.Black
C.Blue
D.Clear

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Combustion knock will most likely occur as a result of using a fuel with（）
A.low ignition quality
B.a high volatility
C.low ignition delay
D.a high cetane number
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High exhaust temperatures from all of cylinder of a turbocharged, four-stroke/cycle diesel engine can be caused by an（）
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B.inadequate fuel supply
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A diesel engine may fail to start due to （）
A.low air charge temperature
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C.excessive fuel dilution of lube oil
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A diesel engine fails to start due to excessive water in the fuelBefore the engine can be started, the water should be removed from the（）
A.fuel lines
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C.crank case pump
D.rocker arm reservoir
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A diesel engine fails to start because of water in the fuelIn order to start the engine, you should （）?
A.turn engine with jacking gear
B.drain filters and strainers and bleed off water at each injection pump
C.use ether to start the engine with blow-down valves open
D.blow through the cylinders and fuel lines with a drying agent
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As engine RPM is increased from idle speed to full load speed, which of the conditions listed will decrease?（）
A.Compression ratio
B.Fuel/Air ratio
C.Compression pressure
D.Lube oil pressure
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Prior to starting, the purpose of turning over a main propulsion diesel engine with the cylinder test cocks open, is to （）
A.test the starting system
B.remove condensation from the cylinders
C.check the compression
D.check for proper lube oil pressure
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In the starting process of a diesel engine, the main object is to attain the compression conditions sufficient to （）
A.turn the flywheel
B.reduce friction
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Air in the fuel lines to the fuel injection nozzles of a diesel will result in （）.
A.lower compression pressures
B.overheating without smoking
C.failure to start
D.a run away without load

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