For a diesel engine, individual cylinder performance is commonly determined by exhaust gas（）

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• In the cylinder head of a two-stroke/cycle diesel engine, valves are used for（）

  A . air intake B . a fuel outlet C . cooling water inlets D . exhausting combustion ga

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• A possible cause for an individual piston to knock when at TDC on a slow-speed, two-stroke/cycle main propulsion diesel engine could be due to （）

  A . early fuel injection B . excessive bearing play within the running gear C . overloading of the cylinder D . all of the above

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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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• For a main diesel engine the lube oil in the bearings is drawn from （）, usually located in the bedplate.

  A . a gravity tank B . a sump C . a vessel D . a bottle

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• Turbocharged four-stroke/cycle diesel engines utilize valve overlap for（）.

  A . improving cylinder scavenging B . preheating the combustion chamber C . reducing air charge density D . preventing valve wear

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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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• After changing out the fuel filters the diesel engine fails to restart, the most probable cause for this condition is a/an（）.

  A . low compression B . air-bound fuel system C . improper spark D . change in viscosity

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• Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the （）

  A . electronic ignition system B . compression of air by the piston C . friction in the fuel injector D . fuel oil bearing system

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

  A . slow-speed diesel B . medium-speed diesel C . high-speed diesel D . constant-speed diesel

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• In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）

  A . improper venting of the cooling system B . carrying the expansion tank water level too high C . a totally clogged impeller in the cooling water pump D . an incorrectly set cooling system temperature control

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• When comparing different fuels for different engines, the ignition quality of diesel fuel oils becomes a less critical consideration as （）

  A . the amount of lube oil additives increase B . piston speeds increase C . injection pressure decrease D . engine speeds decrease

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• Before shutting off the fuel supply to stop a medium or high–speed diesel engine, why is it necessary to allow the engine to idle for a few minutes?（）

  A . To prevent internal damage form local overheating B . To ensure the fuel nozzles are flushed clean C . To clear the smoke stack D . To let the waste heat boiler reduce its rate of steam generatio

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• The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.

  A . reduce water temperature B . reduce water turbulence C . provide an air cushion D . allow for an increase in water volume as the engine warms u

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• Operating a propulsion diesel engine at less than 30% of designed normal load for prolonged periods will result in （）.

  A . decreased fuel consumption per brake horsepower B . more complete cylinder scavenging C . extended valve life D . carbon formation on combustion chamber surface

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• The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top dead center as a result of the （）

  A . expansion of the combustion gases B . exhaust and intake valves just closing C . maximum compression is just being attained D . fuel injection occurring at that point and combustion begi

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• If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）

  A . a broken shaft on the freshwater pump B . an excessive accumulation of scale exchanger C . an incorrect thermostatic element operating range D . lube oil in the cooling water

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• A four-stroke/cycle, 1000horsepower diesel engine fails to start at normal cranking speed with normal fuel pressure and ambient temperatureThe reason for the failure could be（）

  A . glazed liners or pistons B . high lube oil pressure C . excessive compression ratio D . worn valve seats and valve

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• If you suspect a diesel engine is misfiring due to air leakage into the fuel system, you should begin looking for the leak at the （）

  A . fuel line connections to cylinder injection valves B . gasket surfaces of the fuel oil filters C . discharge fitting of the fuel injector pumps D . suction side of the fuel oil tra

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• In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessiveIn order to correct for this, you should（）

  A . build up the piston crown by metal spraying B . build up the cylinder head by metal spraying C . insert shims between the crankpin bearing box and the connecting rod foot D . install a thinner head gasket

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• A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to （）

  A . feel the high pressure fuel line B . check the cylinder exhausts for white smoke frequently C . check the cylinder exhaust temperature D . isolate each cylinder and inspect the injector

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• One remedy for a high firing pressure, in addition to a high exhaust temperature in one cylinder of a diesel engine, is to （）

  A . increase scavenge air pressure B . reduce fuel booster pump pressure C . adjust the fuel rack D . retard fuel injector timing

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• Which of the following statements represents the reason for rolling over a diesel engine with the cylinder indicator cocks open prior?（）

  A . To test the starting system B . To remove air bubbles from the jacket water C . To ensure that the lube oil system delivers pressure D . To ensure foreign material (water etc) is not present in the cylinder

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• An electrically driven automatically operating auxiliary blower is provided for slow speed and （） of a low speed diesel engine.

  A . manoeuvring operations B . bad combustion C . cooling D . mooring trial

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• For a diesel engine, individual cylinder performance is commonly determined by exhaust gas_____________.

  A.chemical analysis B.back pressure readings C.pyrometer readings D.infrared analysis

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