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

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• If the speed of a turbocharged diesel engine is maintained constant the turbocharger speed will （）

  A . decrease until the engine speed increases B . increase as the load increases C . decrease as the load D . increases remain unchanged

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• The function of the piston compression rings used in a diesel engine is to （）

  A . seal the space between the piston and liner B . transmit heat from the piston to the cylinder liner C . reduce the amount of combustion gas blow-by D . all of the above

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• A diesel engine piston ring face is in direct contact with the （）.

  A . top of the ring groove B . cylinder liner oil film C . bottom of the ring groove D . back of the ring groove

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• The main purpose of inspection for a running diesel engine is（）

  A . testing for the mechanical load and the thermal load B . inspecting thermal and mechanical condition of the engine C . inspecting each system and exhaust temperature D . testing for compress pressure and explosion pressure

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• If a diesel engine fails to start，one of the likely causes is （）

  A . low compression temperature B . low ambient air pressure C . high lube oil pump pressure D . high fuel oil booster pump pressure

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• Successful combustion inside the cylinders of a diesel engine is dependent upon （）.

  A . fine atomization B . high temperature C . good mixing of fuel and air D . all of the above

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• If a diesel engines exhaust temperature is abnormally high, the cause could be（）

  A . too light of a load B . injection timing is too early C . overloading of the engine D . too low of a compression ratio

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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 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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• A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) MEP is lower and the scavenging air is cooling the exhaust gases (2) valve overlap in a four-stroke

  A . (1) only is correct B . (2) only is correct C . both (1) and (2) are correct D . Neither (1) or (2) are correct

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• In a diesel engine, when the fuel is injected into the cylinder,（）

  A . the piston is just coming upward from the bottom dead center B . the piston has moved about one-fifth of the way up C . the piston has moved most of the way up and almost reached the TDC D . the piston has just past the TDC

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• The purpose of the compensating adjustment used in a diesel engine hydraulic governor is to （）

  A . compensate for low oil level B . increase governor promptness C . prevent governor hunting D . limit engine load

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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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• If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an （）

  A . excessively late injection timing for each cylinder B . incorrectly adjusted intake valve timing C . incorrectly adjusted fuel injector D . incorrectly adjusted intake valve clearance

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• In a diesel engine, blow-by is generally the result of worn（）

  A . valve guides B . oil control rings C . valve seats D . compression ring

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• On a diesel engine, fuel is delivered into the combustion space by （）.

  A . a cooling system B . a lubrication oil system C . an electric system D . an injection system

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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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• Fuel is admitted to a diesel engine cylinder through the （）.

  A . intake valves B . carburetor C . exhaust ports D . injector nozzle

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• If a diesel engine is smoking excessively under load, the cause could be （）

  A . low exhaust back pressure B . early fuel injection in one of the cylinders C . compression pressure in one of the cylinders D . plugged injector hole

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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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• One advantage of dry cylinder liners used in a diesel engine is the（）

  A . lower thermal expansion rates than wet liners B . greater heat transfer rate than wet liners C . greater wear resistance than wet liners D . procedure to replace dry liners is simpler than for wet liner

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• On a large diesel engine installation, crankshaft axial alignment is maintained by the （）

  A . piston rod guides B . engine thrust bearing C . crosshead bearing D . main shaft flexible coupling

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• What is the effect of heated intake air on a diesel engine? （）

  A . Increases efficiency B . Increases engine horsepower C . Increases engine life D . Reduces engine horsepower

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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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• 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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