A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a （）.

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• In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）

  A . noise coming from that air starting valve B . continuous operation of the starting air compressor C . zero air pressure in the air starting system D . overheated starting air pipe to the cylinder head

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• Which of the following conditions is realized by the turbo-charging of a previously naturally aspirated diesel engine?（）

  A . Ignition lag increases B . Lube oil system pressure increases C . Brake specific fuel consumption increased D . Mechanical efficiency increaded

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• Which of the following statements is correct for the design and installation of diesel engine cooling water systems?（）

  A . An alarm device with audible and visible signals is required for all cooling water systems B . Propulsion engines with bores over 200 mm are to be fitted with cooling water jackets C . Each totally enclosed cooling system shall be provided with a suitable head tank D . Drain cocks are to be provided at the lowest points of all cylinder water jacket

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• Which of the following statements is true regarding the installation of piston rings on two-stroke/cycle, diesel engines as compared to four-stroke/cycle, diesel engines?（）

  A . In a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greater B . Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the ports C . No gap is required to exist between the ends of the ring when cold in a two-stroke/cycle engine, but a small gap is required in a four-stoke/cycle engine D . The gaps should be staggered on either side of a piston in a two-stroke/cycle engine, while staggering is not necessary in a four-stroke/cycle engine

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• Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?（）

  A . compression must be low for effective spark ignition B . compression must be low for required horsepower and torque generation C . compression must be low to prevent pre-ignition D . compression must be low to have effective pre-ignitio

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• Which lubricating oil additive is used in diesel engines to reduce the tendency for sludge and varnish to form on the engine parts?（）

  A . Flash point improvers B . Pour point improvers C . Inhibitors D . Foam suppressor

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• During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the following actions is used to stop the shaft from turning prior to reversing the engine rotation?（）

  A . Flywheel inertia B . Admission of starting air C . The way of the vessel D . securing of fuel to the cylinder

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• On a turbo-charged, medium-speed diesel engine, which of the following problems is an indication of a restricted air intake passage?（）

  A . Engine is hard to start B . Engine misses C . Surges at governed RPM D . Coolant temperature is too low

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• A device which functions to bring a diesel engine to a full stop to protect it from damage is known as a/an （）

  A . torque limiter B . over-speed trip C . over-speed governor D . load limit governor

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• If a diesel engine runs roughly, which of the systems listed is most likely to be at fault?（）

  A . Fuel B . Lubricating C . Cooling D . Ignitio

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• A diesel engine is supercharged in order to（）

  A . lower the no-load RPMs B . provide more air for combine with the fuel C . increase the no-load RPMs D . provide more fuel combine with the air

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• Which of the following methods is normally used to lubricate bearings in a small high-speed diesel engine?（）

  A . Splash lubrication B . Pressure lubrication C . Sight feed lubricators D . Mechanical lubricator

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• The diesel engine is a type of （）.

  A、A. turbine engine B、B. gas turbine C、C. steam engine D、D. internal combustion engine

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• Which of the combustion parameters listed is used in a diesel engine, but NOT related to the injection system?（）

  A . Atomization B . Metering C . Effective stroke D . Penetratio

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• Modern marine diesel engines using mechanical fuel injection, operate on a combustion cycle which is（）

  A . a combination of constant volume and constant pressure B . a combination of constant temperature and constant pressure C . entirely constant pressure D . entirely constant volume

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• With respect to diesel fuel, the ease with which a cold engine will start is dependent upon the（）

  A . ignition quality of the fuel B . high heating value of the fuel C . amount of carbon residue after combustion D . internal flow resistance in the injector

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• A diesel engine is similar to a gasoline engine except that the former has no （）.

  A . cross-head B . cylinder C . connecting rod D . spark plug

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• In a diesel engine, an integral liner is one in which the cooling water （） Ⅰ.flows through the cylinder liner jackets Ⅱ.touches the outer side of the liner

  A . Ⅰ only B . Ⅱ only C . both Ⅰ and Ⅱ D . neither Ⅰ and Ⅱ

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• The diesel engine is a type of internal combustion engine which ignites the fuel by injecting it into hot, high pressure air in a （）.

  A . air bottle B . air compressor C . crank case D . combustion chamber

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• Which of the following conditions is most likely to occur when unburned fuel contaminates the crankcase of a diesel engine?（）

  A . Lube oil is diluted and its viscosity is reduced B . Sulfuric acid is formed C . Bearings become pitted ad immediately fail D . Valve stems develop sludge deposit

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• Which of the listed diesel engine systems is likely to create the problem of a cylinder regularly misfiring?（）

  A . Lubrication B . Cooling C . Fuel D . Electric ignitio

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• 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

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• The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the （）

  A . method of supplying air B . cooling system C . method of igniting fuel D . valve operating mechanism

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• With respect to diesel fuel, the ease with which a cold engine will start is dependent upon the__________

  A.ignition quality of the fuel B.high heating value of the fuel C.amount of carbon residue after combustion D.internal flow resistance in the injectors

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