Piston cooling fins are located（）

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• Trunk-type diesel engine pistons are most effectively cooled by heat（）

  A . conducted through the engine block B . conducted to water cooled cylinder walls C . conducted through the piston crown D . loss to escaping exhaust gase

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• （） is sometimes used for piston cooling since leaks into the crankcase would not cause problems.

  A . Diesel oil B . Hydraulic oil C . Lube oil D . Mineral oil

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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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• Under rotary pumps are the gear, （）, cam-and-piston and screw types.

  A . reciprocating B . diffuser C . turbine D . vane

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• The piston ring grooves for a standard engine are （）

  A . chromium-plate against wear B . anti-corrosion treated C . white metal lined against wear D . flame hardened against wear

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• Trunk type diesel engine pistons are effectively cooled when heat is（）

  A . radiated through the engine block B . transferred to water cooled cylinder walls C . conducted through the piston crown D . transferred to escaping exhaust gase

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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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• Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.

  A . cylinder liners and piston rings B . main bearings C . crankpin bearings D . turboblower

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• In a radial piston pump, reversal and control of fluid flow are accomplished by moving the （）.

  A、central valve B、radial plunger C、floating ring D、cylinder body

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• These piston rings are so badly worn that they must be （）.

  A . renewed B . welded C . machined D . chromium-plated

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• Around the combustion chamber, all the main components are bore cooled to give low strains and the smallest, circumferentially symmetric deformations for good sealing between piston rings and liner（）

  A . thermal B . mechanical C . plastic D . elastic

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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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• The cylinders, with cooling jackets, are （） to the engine frame by eight tie rods.

  A . screwed B . welded C . fastened D . rotated

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• Ring groove inserts are occasionally used on aluminum alloy piston to（）

  A . reduce the ring groove wear rate B . seal against crankcase vapors C . lessen the wear on aluminum part of the cylinder D . allow for the greater expansion rate of aluminum

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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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• Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to （）

  A . maintain low pH in the cooling water B . reduce the cooling water temperature C . increase cooling water hardness D . form a protective film on metal surface

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• The piston cooling system may employ similar components, except that （） is used instead of a head tank.

  A . a sump tank B . a feed well C . a double bottom tank D . a drain tank

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• There is a （） system lubricating the running gear and cooling the piston and sometimes lubricating the cylinders.

  A . recirculating B . total loss C . cooling D . refrigeratio

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• Cylinders of marine diesel engines are normally cooled by （）.

  A . sea water B . fine mineral oil C . sanitary water D . fresh water

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• The statements about The Wild Swans at Coole are true______.

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• Orchids are elegant while bamboo gives people coolness in scorching summer.

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• Smoking, makeup, and ______ earrings are considered cool by some young students.

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• The piston crown employs the usual jet-shaker principle with an arrangement of cooling bores in the crown so that the surface temperatures of the crown are moderate with a very even distribution.

  A.water cooling B.oil cooling C.air cooling D.combined cooling

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• On engines having oil cooled pistons the lubricating oil pre-heater must be put into operation and the rate of heating so ______ that the temperature of the piston cooling oil returns are 32 to 35℃ over a period of at least two hours.

  A.slow B.quick C.arranged D.high

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