A diesel engine exposed to widely varying ambient temperatures should use to a lubricating oil with （）

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• A diesel engine fails to start because of water in the fuelIn order to start the engine, you should （）?

  A . turn engine with jacking gear B . drain filters and strainers and bleed off water at each injection pump C . use ether to start the engine with blow-down valves open D . blow through the cylinders and fuel lines with a drying agent

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• Cooling the intake air supplied to a diesel engine will （）.

  A . reduce mean effective pressure B . decrease average compression pressure C . decrease air charge density D . increase power output

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• A connecting rod in a four-stroke/cycle diesel engine is subject to（）

  A . tension load twice each crankshaft revolution B . compression load during power and compression strokes C . inertia load once every four crankshaft revolutions D . bending loads at bottom and top dead center

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• A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the （）.

  A . temperature of the exhaust gases B . energy supplied to the turbocharger C . air pressure to the intake manifold D . purge of exhausted gases from the cylinder

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• Fuel droplets injected into a diesel engine cylinder must have adequate penetration to （）

  A . prolong the ignition delay period B . ensure the beginning of fuel injection C . thoroughly utilize the air charge D . allow controlled fuel combustio

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• Bridge gauge can be used to measure （） of a diesel engine.

  A . diameters of journals B . deflections of crankwebs C . diameters of crankpins D . none of the above

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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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• A diesel engine may fail to start due to （）

  A . low air charge temperature B . high cranking speed C . excessive fuel dilution of lube oil D . high compression pressure

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• A supercharged diesel engine when compared to a similar naturally aspirated diesel engine, will develop an increase in （）

  A . ignition lag B . engine horsepower C . lube oil system pressure D . specific fuel consumptio

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• Defective timing gear in a diesel engine may lead to （）.

  A . smoky exhaust B . starting failure C . overload D . over speed

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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 distorted spray pattern from a fuel injector can cause a diesel engine to have （）

  A . higher firing pressure B . more power output C . lower fuel pressure D . less power output

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• Friction, engine wear and oil consumption in a diesel engine are directly related to the （）.

  A . acidity of the oil B . pour point of the oil C . flash point of the oil D . viscosity of the oil

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• A diesel engine may be hard to start if the （）

  A . air intake is restricted B . engine is cranked too fast C . vibration dampener is faulty D . exhaust back pressure is low

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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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• Connecting rods in a diesel engine are used to connect the （）.

  A . engine to the bed B . rocker arm to the camshaft C . crankshaft to the gear train D . piston to the crankshaft

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• Diesel oil may be used to cool （） of a diesel engine.

  A . cylinders B . exhaust valves C . pistons D . fuel valve

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• Defective governor in a diesel engine may lead to （）.

  A . smoky exhaust B . starting failure C . ignition relay D . over speed

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• A restricted air intake to a diesel engine may result in the engine （）.

  A . failing to reach rated speed B . knocking under maximum load C . hunting or surging under light load D . overspeeding and running away

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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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• Defective air cooler in a diesel engine will lead to （）.

  A . smoky exhaust B . starting failure C . overload D . over speed

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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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• 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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