Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished（）

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• If the speed of a turbocharged diesel engine is maintained constant the turbocharger speed will （）

  A . decrease until the engine speed increases B . increase as the load increases C . decrease as the load D . increases remain unchanged

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• When used in conjunction with a turbocharger, the main function of an after-cooler is to （）

  A . increase the density of the cylinder air charge B . prevent turbocharger overheating C . liminate the need for a pre-cooler D . remove moisture from air compressed by the turbocharger

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• Exhaust temperature increases in all cylinders, the possible cause may be（） (1) increased scavenging air temperature (2) air in fuel pumps and fuel valves (3) fouling of air and gas passages

  A . (1)+(2) B . (1)+(3) C . (2)+(3) D . (1)+(2)+(3)

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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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• The process of scavenging a two-stroke/cycle diesel engine serves to（）

  A . improve fuel flow volume B . cool the exhaust valves C . reduce the intake air charge density D . increase the temperature of exhaust gase

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• Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.

  A . during the valve overlap period B . with only the exhaust valve open C . at a pressure below atmospheric D . without cooling the cylinders or pisto

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• A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) MEP is lower and the scavenging air is cooling the exhaust gases (2) valve overlap in a four-stroke

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

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• Leaking oil seals on a diesel engine turbocharger can cause（）

  A . the engine to run after the fuel has been secured B . the engine to over-speed C . a fire D . all of the above

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• The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the （）

  A . inlet nozzle ring B . turbine wheel blade C . diffuser passages D . inlet vol

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• The two-stroke cycle begins with the piston coming up from the BDC, with the scavenging ports in the sides of the cylinders being （）.

  A . open B . uncover C . covered D . closed

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• The operating speed of a turbocharger is directly dependent upon（）

  A . engine speed B . engine load C . intake manifold pressure D . atmospheric pressure

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• The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.

  A . so a height B . such a height C . so high D . such high

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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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• In a main propulsion turbocharged diesel engine, the speed of the turbocharger varies according to the （）

  A . governor droop B . speeder spring tension C . fuel rack lag D . load on the engine

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• Air scavenging of a diesel engine cylinder（）

  A . blows out the exhaust gases B . supplies oxygen for combustion C . cools the valves and cylinder walls D . all of the above

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• A turbocharged diesel engine will have an intake manifold pressure（）

  A . constantly decreasing as engine load increase B . constantly increasing as the amount of supercharging increases C . approximately equal to exhaust manifold pressure at all times D . approximately equal to atmospheric pressure at all time

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• A four-stroke cycle, turbocharged, 1000 horsepower diesel engine has been operating under loadThe load suddenly increases, causing excessive black exhaust smoke, and a rapid rise in the lube oil temperatureIn response to this condition, you should:（）

  A . reduce load B . check your exhaust C . adjust cooling water temperature D . increase lube oil flow

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• Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?（）

  A . Excessive piston blow-by to the manifold B . Insufficient cooling water flow C . Accumulated water in the air boxes D . Clogged air intake filter

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• The air supplied to the cylinders by a turbocharger is often reduced in volume by a/an （）

  A . air compressor B . diffuser C . after-cooler D . ventilator

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• "Scavenging" on a diesel engine means （）.

  A . injecting fuel oil into a cylinder B . removing exhaust gases from the cylinder C . forcing air into the cylinders under pressure after the exhaust valve has dosed D . a combination of all the above

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• Which of the following problems can cause an above normal air temperature to develop in the intake manifold of a turbocharged and after-cooled diesel engine?（）

  A . Faulty turbocharger turbine diffuser ring B . Faulty turbocharger compressor ring C . Insufficient cooling water flow D . Clogged air intake filter

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• After-cooling of a turbocharged diesel engine will result in （）

  A . higher torque but lower brake horsepower B . lower torque but higher brake horsepower C . higher torque and lower brake horsepower D . lower torque and higher brake horsepower

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• In a turbocharged four-stroke/cycle diesel engine, the exhaust valve remains open until after top dead center and the intake valve opens before top dead center to_______.

  A.produce a scavenging effect in the combustion space B.equalize cylinder and exhaust manifold pressures C.alleviate the difference in valve size between the intake and exhaust D.flush out condensate that collects after each compression stroke

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• When the load is increased on a turbocharged diesel engine, the amount of increased air supplied by the turbocharger will___________.

  A.lag behind the increased fuel supplied to the engine B.enter the engine along with the increase in the fuel C.enter the engine before the increased fuel supply D.leave the turbocharger as a negative pulse

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