The timing of diesel engine air starting valves is controlled by（）

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• The color of the exhaust from a diesel engine should be （）

  A . clear B . hazy light brown C . hazy light blue D . hazy light grey

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• If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will（）

  A . backfire through the air intakes B . develop less power under load C . have high firing pressures D . lift its cylinder relief valve

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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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• In some diesel engine designs,（）the injection of cylinder oil is timed to impinge when the piston and only impinge on（）

  A . is coming upward；cylinder ring belt B . is going downward；piston ring belt C . is coming upward；piston ring belt D . is going downward；cylinder ring belt

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• In a diesel engine, the time taken to heat the fuel particles, turn them into vapor, and bring about combustion is called （）

  A . injection lag B . ignition delay C . compression D . turbulence lag

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• What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）

  A . Spark plug B . Heat of compression C . Carburetor D . Glow ping

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• The purpose of compressing the air within the cylinder of a diesel engine is to （）

  A . produce the heat for ignition B . decrease injection lag C . increase ignition delay D . aid in exhausting burnt gase

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• The crankshaft of diesel engine is supported by （）.

  A . tension stretch B . tie rods C . through bolts D . main bearing

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• The cooling water of the diesel engine should be treated, because it has（）

  A . alkale scence B . acidity C . salinity D . impurity

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• Significant retardation of a diesel engine fuel injection timing will result in （）

  A . smoother engine operation B . advanced fuel ignition C . increased fuel economy D . reduced engine power

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• The purpose of the flywheel of a diesel engine is to （）.

  A . counterbalance the crank throws on the crankshaft B . keep the engine running smoothly between power stroke C . provide a belt-driving surface for the operation of auxiliary machinery D . prevent the engine from overspeeding

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• The bore of a diesel engine cylinder describes the （）

  A . swept volume of the cylinder B . inside diameter of the cylinder C . piston displacement in the cylinder D . length of the piston stroke

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• When fuel enters the crankcase of a diesel engine, it （）

  A . dilutes the lube oil and reduces its viscosity B . forms sulfuric acid in the lube oil C . causes pitting and failure of the bearings D . causes sludge deposits on valve stem

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• What is the best indication of the loading of a diesel engine?（）

  A . Oil temperature B . Manifold pressure C . Exhaust gas temperature D . Fuel consumptio

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• A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longer

  A . (1) only B . (2) only C . both (1) and (2) D . neither (1) nor (2)

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• How dose water enter the crankcase of a diesel engine?（）

  A . Through the crankcase exhauster B . As water vapor contained in blow-by C . Demulsifying lube oil passing through the main bearings D . Condensation from vapor formed in the expansion tank

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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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• A diesel engine burns （） a gasoline engine of the same capacity in the same period of time.

  A . as much fuel as B . less fuel than C . less fuel as D . more fuel tha

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• The main purpose of starting the diesel engine on air briefly is（）

  A . to inspect if the cylinder has the water leakage B . to expel out the residual water/gas/oil from the cylinder C . to check if fuel supply is normal D . A and B

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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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• The overspeeding of the diesel engine driving an electric generator could cause （）.

  A . low voltage trip to trip B . reverse power trip to trip C . damage to windings D . excessive exhaust temperature

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• The marine diesel engine is a type of diesel engine used on shipsThe _____ of its operation is not very difficult to understand.

  A.principle B.principal C.cause D.case

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