Diesel engine blow-by is the leakage of combustion gases past the （）

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• In a four-cycle diesel engine piston blow-by can result in increased（）

  A . crankcase pressure B . compression pressure C . scavenge pressure D . exhaust manifold pressure

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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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• Trunk type diesel engine pistons are effectively cooled when heat is（）

  A . radiated through the engine block B . transferred to water cooled cylinder walls C . conducted through the piston crown D . transferred to escaping exhaust 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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• When fuel is injected late into a diesel engine cylinder,（）.

  A . the exhaust will be clear B . fuel consumption will be low C . all the fuel will be burned at top dead center D . fuel consumption will be high

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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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• In a diesel engine, excessive cylinder liner wear will cause （） (1) increased blow-by (2) wear between the piston ring and groove

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

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• Fuel is ignited in a diesel engine cylinder by （）

  A . a spark plug B . injectors C . the heat of compression D . increasing jacket water temperature

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• One of function of diesel engine lubricating oil is to （）

  A . induce carbon formation on cylinder walls B . improve fuel penetration in the combustion space C . form a friction reducing film between mating surfaces D . lubricate the fuel injectio

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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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• 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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• 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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• Immediately after any diesel engine is started, the engineer should check the （）

  A . crankcase pressure B . lube oil pressure C . saltwater pressure D . exhaust temperature

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• Low compression pressure in a diesel engine is caused by（）

  A . low water in the expansion tank B . improperly seated valves C . low fuel oil pressure D . worn or broken cylinder liner sealing ring

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

  A . the air start valve timing gears and rods B . a cylinder check valve C . individual cams and valve gear D . an air manifold poppet valve

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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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• Diesel engine piston ring blow-by is usually caused by excessive ring clearance at the ring（）

  A . back B . side C . gap D . bottom

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• Diesel engine air start valve timing is controlled by（）

  A . engine operating speed B . an air manifold C . a hydraulic distributor D . individual cams and valve gear

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• A thrust bearing is used with a propulsion diesel engine to （）.

  A . control axial movement of the crankshaft B . transmit engine thrust to the propeller shaft C . absorb vibrations in the propeller shafting D . prevent propeller thrust from being transmitted to the hul

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• A disadvantage of a four-stroke/cycle diesel engine is （）

  A . higher working temperature of piston and cylinder B . the use of scavenge ports C . fewer power strokes per revolution of the crankshaft D . part of the fuel is burned as the piston is moving away from top dead center

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• In a diesel engine, blow-by（）

  A . increase exhaust back pressure B . causes excessive crankcase pressure C . can only be detected by a compression check D . decreases fuel consumptio

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• In a diesel engine, blow-by__________.

  A.increase exhaust back pressure B.causes excessive crankcase pressure C.can only be detected by a compression check D.decreases fuel consumption

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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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