The lowest ring of a piston is （）.

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• If the back clearance of a piston ring is excessive,（）

  A . compression pressure in the cylinder will be higher B . carbon will accumulate behind the ring C . combustion gases will penetrate beneath the ring land D . piston side thrust will be increased

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• The function of the piston compression rings used in a diesel engine is to （）

  A . seal the space between the piston and liner B . transmit heat from the piston to the cylinder liner C . reduce the amount of combustion gas blow-by D . all of the above

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• The purpose of the wearing rings used in a centrifugal pump is to （）.

  A . prevent an internal explosion in the pump when it is overheated B . enable a visual inspection of the pump while it is running C . insure a proper alignment of the pump coupling to the driver D . accommodate for friction between the impeller and the easing

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• The lowest temperature at which fuel combustion becomes self-sustaining in the presence of a source of ignition, is defined as the （）

  A . auto-ignition point B . flash point C . burning temperature D . fire point

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• In a diesel engine, when refitting piston rings you should （） Ⅰ.check the ring gap at the smallest diameter of the cylinder Ⅱ. Remove carbon from the ring groove

  A . Ⅰ only B . Ⅱ only C . both Ⅰ and Ⅱ D . neither Ⅰ nor Ⅱ

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• Which of the following is the lowest cost DB2 product that can be legally installed on a Linux server that has 6 CPUs?（）

  A . DB2 Express Edition B . DB2 Personal Edition C . DB2 Workgroup Server Edition D . DB2 Enterprise Server Editio

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• What is a function of the wearing rings used in most centrifugal pumps?（）

  A . Absorb erosion of high velocity discharge stream B . Seal pump shaft against entry of air C . Isolate the discharge side from the suction side D . Dampen the turbulent discharge flow

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• The piston rings are manufactured with a diameter （） the bore of the cylinder.

  A . larger than B . smaller than C . equal to D . none of the above

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• A metal ring on the bottom of a block，to which the standing part of a tackle is spliced，is known as a(n)（）.

  A . becket B . loop C . swivel D . eye

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• The primary purpose of oil control rings on a diesel piston is to（）

  A . provide a reservoir for cylinder lubrication B . pump oil into the combustion space for cylinder cooling C . prevent excessive lubricating oil consumption D . allow hydraulic oil film formation on the cylinder

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• （）refers to the depth of a vessel below the waterline，measured vertically to the lowest part of the hull，propellers or other reference points.

  A . Free board B . Stability height C . Metacentric height D . Draft

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• The lowest temperature at which a liquid gives off enough vapor to ignite in the presence of an ignition source is called its （）.

  A . boiling point B . flash point C . viscosity point D . toxic point

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• Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）

  A . Control the amount of lube oil burned in the combustion chamber B . Transmit heat from the piston to the cylinder liner C . Prevent damage to ring groove inserts by acting as a heat dam D . Dissipate combustion chamber gas pressure by channeling it through the ring ga

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• A bright shiny appearance of the sealing surfaces on diesel engine compression rings indicates（）

  A . combustion gas blow-by B . excessive lubrication C . properly functioning rings D . insufficient cylinder cooling

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• Which of the following are components of a mechanical seal? （） (1) stationary ring (2) rotational ring (3) packing (4)spring

  A . (1), (2) and (3) B . (1), (2) and (4) C . (2), (3) and (4) D . None of the above

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• The lowest temperature required to cause self-sustained combustion of a substance independent of any outside source of ignition is called （）.

  A . explosive range B . flash point C . ignition temperature D . combustion temperature

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• On a nautical chart，the inner ring of a compass rose indicates（）.

  A、true directions B、compass error C、deviation D、magnetic directions

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• Among the rings of a piston the （） one is subjected to the greatest load and temperature.

  A . bottom B . middle C . top D . none of the above

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• Set in the fictional world of Middle-earth, the film The Lord of the Rings follows the hobbit as he and a Fellowship embark on a quest to destroy the One Ring, and thus ensure the destruction of its maker, .

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• ______ refers to the depth of a vessel below the waterline，measured vertically to the lowest part of the hull，propellers or other reference points．

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• 153. On a nautical chart, the inner ring of a compass rose indicates ______.

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• 255. Which information does the outer ring of a compass rose on a nautical chart provide?

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• 119. On a nautical chart, the inner ring of a compass rose indicates _____.

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• The girl who found the ring received a generous_____of five pounds.

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