Diesel oil may be used to cool （） of a diesel engine.

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• If the detergent type lubricating oil being used in a diesel engine is black, the oil （）

  A . must be centrifuged B . must by filtered C . must be changed D . is holding finely dispersed carbon in suspensio

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• A diesel engine exposed to widely varying ambient temperatures should use to a lubricating oil with （）

  A . a high viscosity index B . a low viscosity index C . neutralize acids D . resist oxidation at high temperature

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• The radiotelegraph alarm signal may be used to announce（）.

  A . that a distress message will follow B . a request for assistance in searching for a man overboard C . an urgent warning about a cyclone D . All of the above

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• A magnetic strainer is used in the diesel engine reduction gear oil system to remove small particles of（）.

  A . water B . babbitt C . iron or steel D . acid

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• In some cases facilities may be provided for emergency overriding oil pressure shutdown, if this facility is used, adequate warning must be given to （）.

  A . the bridge watch-keeper B . the captain C . the chief engineer D . the engine room staff

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• In a medium speed diesel engine, a trunk type piston may be cooled by（） Ⅰ.oil circulation though passages in the piston crown Ⅱ.heat transfer through piston rings and liner wall

  A . Ⅰ only B . Ⅱ only C . either Ⅰ or Ⅱ D . neither Ⅰ or Ⅱ

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• Bridge gauge can be used to measure （） of a diesel engine.

  A . diameters of journals B . deflections of crankwebs C . diameters of crankpins D . none of the above

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• Which lubricating oil additive is used in diesel engines to reduce the tendency for sludge and varnish to form on the engine parts?（）

  A . Flash point improvers B . Pour point improvers C . Inhibitors D . Foam suppressor

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• When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）

  A . The diesel oil must never be allowed to mix with the heavy fuel B . The temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valve C . The heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valve D . The heating steam must be secured before the diesel oil passes through the three-way valve

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• To function properly, oil control rings used on a diesel engine piston must distribute sufficient oil to all parts of the cylinder wall and must also（）.

  A . prevent any lubricant from reaching B . prevent excessive lubrication from reaching the combustion space C . Provide metal-to-metal contact to seal the cylinder against blow-by D . assure a positive means of scraping carbon accumulation from the cylinder

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• A diesel engines crankcase oil level is found to be too high√ You should suspect that （）.

  A . the engine was over filled B . there might be a fuel leak C . there might be a water leak D . all of the above

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• If water is found in the crankcase of a diesel engine, the cause may be due to（）

  A . a cracked cylinder head B . a leaky cylinder head gasket C . a cracked cylinder liner D . any of the above

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• A diesel engine may be hard to start if the （）

  A . air intake is restricted B . engine is cranked too fast C . vibration dampener is faulty D . exhaust back pressure is low

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• A tankerman who permits or causes oil to go into a navigable waterway may be punished federally by（）.

  A . fine B . imprisonment C . suspension or revocation of tankerman's document D . All of the above

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• Separation cloths may be used to（）.

  A . absorb moisture from hygroscopic cargoes B . fill gaps between layers of cargo C . wrap cargo that leaks from packaging D . keep bagged cargo leakage from contacting the deck

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• Injectors for use with heavy fuel oil must be cooled by either water or light oil to （）

  A . prevent heat corrosion to internal components B . increase fuel delivery rate and economy C . prevent pre-ignition D . avoid carbonization of the nozzle ti

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• （） providing lubricating films, oil used in marine diesel engines have to remove heat from oil cooled piston.

  A . Except for B . Beside C . Except D . In addition to

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• If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）

  A . excessive ring action B . excessive ring temperature C . improper ring rotation D . excessive ring face wear

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• Fuel oil day tanks for diesel engines must be checked and cleaned and cleaned at regular intervals in order to remove（）

  A . sludge B . water C . micro-organism growth D . all of the above

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• The pressure differential across a diesel engine lube oil system duplex filter should be checked to （）

  A . determine the need for filter cleaning B . measure any change in oil viscosity C . prevent damage to the filter D . determine the need for batch filtratio

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• Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to （）

  A . decrease the time required between cleanings B . removes all large and small foreign objects C . ensure a positive flow of oil at all times D . ensure that all lube oil has been treated twice

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• In order to benefit from the use of storm oil in heavy seas，the storm oil should be spread （）.

  A . around the rudder and screws B . completely around the vessel C . to leeward of the vessel D . to windward of the vessel

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• The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated （）

  A . for atomizing B . for centrifuging C . in a storage tank D . in the re-circulating line

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• When the heavy fuel oil is heated to achieve the viscosity of 10-15 cSt, may occurTo avoid this, a system is used in most occasions.

  A.boiling and cavitations; low temperature B.boiling and cavitations; pressurized C.leaking and boiling; low temperature D.leaking and boiling; pressurized

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