The scavenge air receiver is of a simplified and modular design with integral non-return flaps, hanging cooler and two auxiliary air blowers（）

相似题目

• Which of the following statements is not true concerning symptom of a fire in the scavenge air box?（）

  A . an increase in the exhaust temperature of the affected cylinder B . the turbocharger may surge C . the explosion pressure in all cylinders will rise violently D . smoke from the turbocharger air inlet filter will be see

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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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• To avoid scavenge fires occurring the engine timing and equipment maintenance （）.

  A . should be correctly carried out B . should correctly be taken place C . should carded with care D . must to carry out with great care

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• Broken piston rings manifest themselves during the scavenge port inspection by（）

  A . Lack of elastic tension, when the rings are pressed into the groove by means of a stick B . Blackish appearance C . Fractured rings and missing rings D . all off the above

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• If a four-stroke/cycle diesel engine is started by injecting air into the cylinder, the pistons receiving the charge of starting air must be（）

  A . on the power stroke B . on the exhaust stroke C . at the end of the power stroke D . at the start of the intake stroke

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• Increased air （） will raise scavenge efficiency and allow a greater mass of air to be compressed； more fuel may now be burned giving an increased power.

  A . specific volume B . density C . viscosity D . calorific value

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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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• Great care is dedicated to the removal of from the scavenge air（）

  A . gravity B . viscosity C . density D . humidity

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• It is very important that each cylinder should be （） scavenged before the charged air is compressed.

  A . well B . good C . excellent D . respectively

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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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• A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longer

  A . (1) only B . (2) only C . both (1) and (2) D . neither (1) nor (2)

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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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• When the order （） is received from the bridge, the main air stop valve in the starting air line should be shut.

  A . stand-by engine B . full ahead C . finished with engine D . full away

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• The term diesel engine scavenging means（）

  A . delivering more air into the cylinder than it would normally receive during an ordinary charging process B . forcing the products of combustion out of the cylinder with the fresh air charge C . collecting the air charge at the cleaner D . combustion and expansion of hot ga

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• What preventative maintenance should be done frequently to diesel engine starting air receivers?（）

  A . Drain the accumulated moisture B . Test the relief valves C . Watch the temperature to prevent fluctuations in pressure D . Clean the interior to remove oil and foreign matter

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• Once a scavenge fire is detected the engine （）.

  A . will be speeded up B . should be slowed down C . must slow down D . have to be slow dow

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• Condensate must be drained periodically from the air compressor receivers to prevent （）.

  A . second stage cylinder lockup B . oil sump contamination C . faulty operation of pneumatic valves D . corrosion of air receiver baffle

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• Which of the routine maintenance procedure listed is required for starting air receivers?（）

  A . Frequent draining of accumulated moisture B . Frequent testing of relief valves C . A close watch on temperature to prevent fluctuations in pressure D . Frequent cleaning to re move oil and foreign matter

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• Propulsion engines and the vast majority of auxiliary generator engines are designed to allow a generous through-flow of scavenge air in order to control （）

  A . the lubricating oil consumption B . the turbine blade temperature C . the flow rate of fuel D . scavenge air pressure

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• The engine is started with （） supplied from air receivers.

  A . pressure oil B . pressure water C . compressed air D . cooling water

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• Whilst the engine is turning, check to see that no water is leaking into the crankcase, scavenge air belt, or from （）.

  A . exhaust valves B . starting valves C . fuel valves D . the indicator cock

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• Air receivers installed in starting air systems are to be （）.

  A . cylindrical in shape with service connections located at the top and bottom B . opened and made available for inspection during biannual inspections provided C . with automatic drain traps for the removal of moisture D . so installed as to make the drain connections effective under extreme conditions of trim

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• Increased air _____ will raise scavenge efficiency and allow a greater mass of air to be compressed; more fuel may now be burned giving an increased power.

  A.specific volume B.density C.viscosity D.calorific value

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