Some diesel engines are supercharged with a （）

Directional intake ports in diesel engines are used to （）.

A . reduce air charge turbulence B . induce air swirl C . deflect hot combustion gas away from the valves D . oppose the effects of piston induced squish

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An electric heater built into some smaller diesel engines is used to （）.

A . raise lube oil viscosity for easier starting in cold weather B . increase air inlet temperature C . increase compression ratio D . increase jacket water temperature for easier starting in cold weather

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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 most common diesel engine fuel system problems are caused by （）.

A . incorrect adjustments B . dirty fuel C . broken fuel lines D . excessive vibratio

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The interior of some diesel engine saltwater heat exchangers are protected from corrosion by the use of（）

A . aluminum plates B . lead cathodes C . copper baffle plates D . sacrificial zinc

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The intake valves in a diesel engine are reseated by （）.

A . cam followers B . push rods C . combustion gases D . valve spring

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Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine （）

A . camshaft beatings B . main bearings C . piston crowns D . cylinder wall

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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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Diesel engines are considered safer than gasoline engines because（）.

A . they are more heavily built B . the fuel used is less volatile C . they can be easily reversed D . they operate at a lower speed

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The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）

A . prevent engine back pressure at heavy loads B . increase total engine efficiency at low loads C . prevent boiler corrosion at low engine loads D . improve engine fuel consumption at any load

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Diesel engine cylinder head test cocks are used to（）

A . check cylinder lubrication prior to starting engine B . connect exhaust gas analyzers to determine engine efficiency C . pressure test cylinder heads to check for leaks D . remove moisture accumulations from cylinder prior to starting

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The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by（）

A . governor flyweight action on a pilot valve which controls fuel injection B . governor flyweight motion acting on fuel controls through suitable linkage C . positioning a butterfly valve in the fuel delivery system positioning D . a servomotor piston attached to the fuel control

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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 engine cylinder head test cocks are used to （）

A . check cylinder lubrication B . connect the pressure indicator pressure C . test cylinder heads D . connect the exhaust gas pyrometer

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All diesel engines are classified as（）.

A . four cycle B . compression ignition C . vacuum ignition D . external combustio

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In some modern large diesel engines, which of the following is used as the support for the main bearings?（）

A . Bedplate B . Block C . Base D . Sum

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Diesel engine air start system check valves are opened by （）

A . an air start cam B . cylinder compression pressure C . starting air pressure D . valve spring

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The reversing cams of some four-stroke/cycle diesel engines are brought into position by （）

A . sliding the camshaft along its axis B . rotating the cam 180 C . rotating the cam followers 180 D . moving the idler sprockets in the drive chai

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The function of the after-cooler installed between the turbocharger and intake manifold on some diesel engine, is to （）

A . increase the density of the intake air B . decrease turbocharger power usage C . reduce exhaust gas temperature D . compensate for turbocharger PRM fluctuatio

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Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.

A . operated manually once an hour B . operated until the engine has started C . placed into operation only at maximum load D . adjustable to meet lubrication requirement

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Cylinders of marine diesel engines are normally cooled by （）.

A . sea water B . fine mineral oil C . sanitary water D . fresh water

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Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinderIf the cooling water temperature from all cylinders begins to rise above normal, you should suspect （）

A . increase blow-by in all cylinders B . incomplete combustion in all cylinder C . overloading in all cylinders D . insufficient fuel delivery to all cylinder

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The over-speed trip device installed in some diesel engines is automatically actuated by__________.

A.spring force B.hydraulic pressure C.centrifugal force D.mechanical linkage

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The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by______.

A.governor flyweight action on a pilot valve which controls fuel injection B.governor flyweight motion acting on fuel controls through suitable linkage C.positioning a butterfly valve in the fuel delivery system positioning D.a servomotor piston attached to the fuel controls

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Some diesel engines are supercharged with a （）

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