Air in the fuel lines to the fuel injection nozzles of a diesel will result in （）.

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• A non-return valve in the air delivery line near to the compressor must be （）type similar to the compressor discharge valve.

  A、the low inertia B、the high inertia C、the low velocity D、the high velocity

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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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• Fire protection regulations for towing vessels require any fuel line subject to internal head pressure from fuel in the tank to（）.

  A . be fitted with a positive fuel shut-off valve located at the tank B . have a shut-off valve at the top of the tank C . have a gate valve easily accessible in the space where the tank is located D . have a drain cock at the lowest point in the fuel line

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• Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as（）

  A . supercharging B . scavenging C . turbulence D . swept volume charging

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• Air line lubricators are used in compressed air systems to lubricate （）.

  A、the suction and discharge valves B、tools and equipment served by compressed air C、air line reducing valves D、all of the above

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• A fuel line breaks, sprays fuel on the hot exhaust manifold, and catches fire. Your first action should be to（）.

  A . Batten down the engine room B . start the fire pump C . apply carbon dioxide to the fire D . shut off the fuel supply

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• The FIRST step to take in fighting an engine room fire resulting from a ruptured fuel oil service line, is to （）.

  A . evacuate all engine room personnel B . fight the fire with hand portable extinguishers C . activate the main CO bank D . stop the flow of leaking fuel oil

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• The injection may be delayed, （）the pumps are in good order, if the fuel lines to the injection valves have not been cleared of air.

  A . because B . though C . since D . until

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• The soot blowers are operating in the oil fuel boiler the air/fuel ratio must （） throughout the action, and blowers greased after use.

  A . be increased B . be decreased C . remain constant D . either be increased or remain constant

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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 fresh air coming in through the inner air ports, is compressed by（） to a higher pressure.

  A . the cylinder head B . the cross-head C . the moving piston D . the stationary pisto

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• （） or air venting arrangement is fitted to the fuel supply passage.

  A . An air pump B . A compressor C . A fuel pump D . A priming

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• A （） in the air delivery line near to each compressor is essential.

  A . butterfly valve B . globe valve C . gate valve D . non-return valve

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• The fuel injector injects a fine spray of fuel into the hot air and combustion （）, producing much high pressure in the gases.

  A . has begun B . takes place C . occurs D . happe

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• If you suspect a diesel engine is misfiring due to air leakage into the fuel system, you should begin looking for the leak at the （）

  A . fuel line connections to cylinder injection valves B . gasket surfaces of the fuel oil filters C . discharge fitting of the fuel injector pumps D . suction side of the fuel oil tra

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• If a fire occurs in the boiler room as a result of a leaking fuel line, you should FIRST （）.

  A . notify the engineer on watch B . isolate and secure the piping C . throw sand on the fire D . extinguish the fire using a combination nozzle with applicator

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• Fuel oil is regularly transferred to the day tank in order to （）

  A . allow impurities to settle out of the fuel B . allow air to escape from the fuel C . make fuel available for immediate use D . all of the above

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• The diesel engine is a type of internal combustion engine which ignites the fuel by injecting it into hot, high pressure air in a （）.

  A . air bottle B . air compressor C . crank case D . combustion chamber

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• The burning of the fuel adds more heat to the air charge, causing it to expand and force the engine piston to do work on the crankshaftWhat does “it” mean in this sentence?（）

  A . the burning B . the fuel C . the air charge D . the engine pisto

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• The loss of （） from an air compressor could lead to an overheated air discharge and possibly an explosion in the pipelines leading to the air reservoir.

  A、lubricating oil B、compressed air C、cooling water D、sealing ring

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• When possible，what is the FIRST step in fighting an engine fuel-pump fire which results from a broken fuel line?（）

  A . Secure all engine room doors，hatches，and vents B . Close the fuel line valve C . Check the spread of the fire with foam D . Cast the barge off the wharf

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• The fuel booster pump and steam to fuel heater, together with fuel pipe heater tracer line should be shut off as soon as the （） order is acknowledged.

  A . finished with engines B . stop C . stand by D . full ahead

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• Most cities in the country have introduced “Clean Air Zones”（) factories and households are only allowed to burn smokeless fuel.

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• faces' in Line 1 of Paragraph 3 ?◑People in the US won't be surprised at any new faces.◑There won' t be any news in the eye of the US people.◑People in the US will become known to one another.◑There won't be a large growth in the US population.

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