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_______.

相似题目

• 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

  查看最佳答案

• 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

  查看最佳答案

• 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

  查看最佳答案

• Which of the following conditions may be attributed to a fouled turbocharger compressor inlet screen or filter?（）

  A . Decreasing scavenge air pressure B . Increasing exhaust temperatures before the turbine C . Reduction in engine speed D . All of the above

  查看最佳答案

• 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

  查看最佳答案

• 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

  查看最佳答案

• 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

  查看最佳答案

• 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

  查看最佳答案

• A few spots of turbocharger can be caused by（） ①crash stop of engine ② rapid increased of engine speed

  A . ①only is correct B . ②only is correct C . both ① and ②are correct D . neither ① or ② correct

  查看最佳答案

• Which of the following statements is correct regarding a turbocharged four-stroke/cycle diesel generator?（）

  A . At zero load the intake manifold pressure is greater than the exhaust manifold pressure B . At full load the intake manifold pressure and exhaust manifold pressure are equal C . At full load the intake manifold pressure is less than the exhaust manifold pressure D . At full load the intake manifold pressure is greater than the exhaust manifold pressure

  查看最佳答案

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

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

  查看最佳答案

• High exhaust temperatures from all of cylinder of a turbocharged, four-stroke/cycle diesel engine can be caused by an（）

  A . inoperative turbocharger B . inadequate fuel supply C . overload on one cylinder D . unequal load distributio

  查看最佳答案

• 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

  查看最佳答案

• 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

  查看最佳答案

• In the （） pressure charging system the pulse of energy that occur as the exhaust is released from the cylinder to improve the output of the turbocharger.

  A . constant B . pulse C . high D . none of the above

  查看最佳答案

• 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

  查看最佳答案

• 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

  查看最佳答案

• The efficiency of turbocharge system is increased by fitting a charge air cooler （） the compressor.

  A . inside B . before C . after D . against

  查看最佳答案

• 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

  查看最佳答案

• 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

  查看最佳答案

• 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

  查看最佳答案

• 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

  查看最佳答案

• 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

  查看最佳答案

• A few spots of turbocharger can be caused by ①crash stop of engine; ②rapid increased of engine speed.

  A.① only is correct B.② only is correct C.both ① and ②are correct D.neither ① or ② correct

  查看最佳答案