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

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• 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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• Trunk-type diesel engine pistons are most effectively cooled by heat（）

  A . conducted through the engine block B . conducted to water cooled cylinder walls C . conducted through the piston crown D . loss to escaping exhaust gase

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• Problems with the diesel engine fuel injection pump are usually caused by（）

  A . improper adjustment B . contaminated fuel C . kinked fuel lines D . excessive engine vibratio

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• Small crack in the crankshaft bearing surface of a diesel engine are an indication of（）

  A . corrosion fretting B . insufficient lubrication C . abnormal wear D . fatigue failure

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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 crankcase of many diesel engines are kept under a slight vacuum by the （）.

  A . scavenging action of the piston B . piston type vacuum pump taking suction off a differential manometer C . gland exhausting manometer D . crankcase exhaust fa

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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 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 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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• Cast iron pistons used in large propulsion diesel engines are constructed with （）

  A . not taper what so ever B . the skirt being tapered and smaller than the crown C . the skirt being tapered and larger than the crown D . the crown being tapered and smaller than the skirt

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• The two strokes of a two-stroke/cycle diesel engine are （）

  A . power and intake B . intake and exhaust C . exhaust and compression D . compression and power

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• How are the pressure and temperature affected in a diesel engine cylinder during compression?（）

  A . Pressure and temperature decrease B . Pressure and temperature increase C . Pressure decreases and temperature increases D . Pressure increases and temperature decrease

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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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• Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to （）

  A . maintain low pH in the cooling water B . reduce the cooling water temperature C . increase cooling water hardness D . form a protective film on metal surface

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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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• The highest loads applied to the diesel engine crankshaft main bearings are （）

  A . axial loads B . firing loads C . inertia loads D . centripetal load

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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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• 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 supercharged with a （）

  A . slam charger B . turbocharger C . fuel atomizer D . fuel injector

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• Problems with the diesel engine fuel injection pump are usually caused by_____.

  A.improper adjustment B.contaminated fuel C.kinked fuel lines D.excessive engine vibration

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