Heavy residual fuel oils are heated prior to centrifuging to （）

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• A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a （）

  A、the use of a poor quality oil B、the deterioration of its properties C、the formation of deposits D、the reduction in heat transfer ability

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• Machinery driving fuel oil transfer and fuel oil service pumps must be fitted with a remote means of stopping the machinery from （）.

  A . within the space concerned B . outside the space concerned C . the throttle station D . within the fire room

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• What color exhaust will be exhibited when a slow speed two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?（）

  A . White B . Black C . Blue D . Clear

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• Heavy fuel oils generally have an upper average ash content of 0~1% by weight.Which of the following conditions could be expected if the ash content increase above this amount?（）

  A . Glazing of the cylinder liners B . Increase valve wear C . Excessive oil pumping D . Increase fuel consumptio

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• To receive oil residues from the purification of fuel and lubricating oils in the machinery spaces, what kind of tank(s) should be provided on board?（）

  A、bilge tank B、sludge tank . C、overflow tank D、oil collecting tank

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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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• Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce（）.

  A . cold corrosion of the nozzles B . fuel viscosity for better atomization C . carbon accumulation on the nozzles D . fuel detonation in the cylinder

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• The desirable properties of a marine fuel oil should include（）

  A . high flash point and high viscosity B . low flash point and high viscosity C . low heating value and high sulphur content D . high heating value and low sulphur content

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• If a used lube oil analysis indicates excessive fuel dilution, the lube oil should be （）

  A . changed B . centrifuged C . filtered D . settled

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• Heavy fuel oils when spilled are（）.

  A . more harmful to sea life than lighter oils B . easier to clean up than lighter refined oils C . less harmful to sea life than lighter oils D . not a real threat to marine life

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• When centrifuging heavy fuel oil, an important factor to consider is the （） (1) flow rate (2) viscosity of the fuel oil

  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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• Fuel oil having a low cetane rating could result in（）

  A . improved cold weather starting B . excessive fuel oil consumption C . reduced ignition lag D . smoother engine operatio

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• Main engines as well as auxiliary engines operating on heavy fuel should have continuous on the lubricating oil, either according to the bypass or batch principles（）

  A . filtering B . centrifuging C . depositing D . operating

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• Lubricating oil should be changed on a heavy duty diesel engine when（）.

  A . it gets dark in color B . a sample rubbed between fingers feels thin C . it has been in use for a specified interval D . it no longer supports combustio

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• When preparing a ship for heavy weather，fuel oil day tanks should be（）.

  A . pumped overboard to calm the seas B . drained to the lower hull to reduce free surfaces C . filled to ensure that sufficient fuel oil is available during a lengthy emergency D . partially drained to increase free surfaces in order to reduce motio

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• Which of the following operations need NOT to be entered on the Oil Record Book Part I?（） (1) Disposal of oil residues (2) Internal transfer of fuel oil

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

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• If fuel oil were being discharged from the waster outlet of a fuel oil disk type centrifuge, operated as separator, you should（）

  A . remove the discharge ring B . re-prime the purifier C . the centrifuge to its proper speed D . install an additional discharge ring

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• The specific gravity of fuel oil is a （）.

  A . absolute value B . relative value C . constant value D . set value

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• A dirty fuel oil filter is can be detected by （） Ⅰ.fuel oil analysis Ⅱ.observing the pressure drop across the filter

  A . Ⅰonly B . Ⅱonly C . eitherⅠorⅡ D . neitherⅠnor

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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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• A substance found in residual fuels which tends to cause exhaust valve corrosion and grooving, is（）

  A . carbon B . vanadium C . calcium D . hydroge

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• When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.

  A . filter to remove the fuel oil B . use the settler to remove the fuel oil C . remove the fuel oil by centrifuging D . drain and then renew the lube oil supply

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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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