If the piston groove drain holes for the oil control rings become clogged, which of the following is likely to occur?（）

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• When good and steady service conditions have been achieved, the running surfaces of the piston rings and cylinder liner will be（）In addition, the rings will move freely in the grooves and also be well oiled intact, and not unduly worn.

  A . hazy light B . hazy light brown C . hazy light blue D . hazy light grey

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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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• If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will（）

  A . backfire through the air intakes B . develop less power under load C . have high firing pressures D . lift its cylinder relief valve

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• Which of the following problems will occur if the internal drain at either end of a hydraulic, two-way, spool-type directional control valve cylinder were to become plugged?（）

  A . The reservoir would become vapor bound B . The valve would be placed in hydraulic lock C . The spring loaded relief ports would open D . The buffering chambers would be unable to functio

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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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• 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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• If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase（）

  A . inspection covers should not be opened until the engine has cooled B . ventilation system should be continued in operation for one hour for cooling C . scavenge pump should be immediately secured to prevent loss of lube oil D . explosion covers should be opened slightly to provide extra ventilatio

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• If a four-stroke/cycle diesel engine is started by injecting air into the cylinder, the pistons receiving the charge of starting air must be（）

  A . on the power stroke B . on the exhaust stroke C . at the end of the power stroke D . at the start of the intake stroke

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• A condition contributing to diesel engine piston rings sticking in the ring grooves, is insufficient ring clearance at the ring（） Ⅰ.gap Ⅱ.side

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

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• The amount of lubricating oil in the drain tank should be checked by （）.

  A . measuring B . sounding rod C . metering D . weighting

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• In a diesel engine, excessive cylinder liner wear will cause （） (1) increased blow-by (2) wear between the piston ring and groove

  A . (1) only is correct B . (2) only is correct C . both (1) and (2) are correct D . neither (1) or (2) axe correct

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• （） neutralizes the acid conditions and（） cleanses the rings and grooves.

  A . The detergency；the alkalinity B . The alkalinity；the detergency C . The inhabitant；the water D . The additives；the distilled water

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• The sealing function of the piston ring is brought about by the gas pressure above and behind the piston ring, which forces it （） against the bottom of the ring groove, and （） against the cylinder wall.

  A . upwards；inwards B . upwards；outwards C . downwards；inwards D . downwards；outward

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• Holes in the bulwark，which allow deck water to drain into the sea，are（）.

  A . doggers B . fidleys C . freeing ports D . swash port

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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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• If the piston ring gap remains insufficient when installing new rings, youshould（）

  A . install oversized rings B . hone the cylinder liner to allow ring installation C . compress the rings tighter with a compressing tool D . file the ends of the ring

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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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• The piston rings if found worn out （） and supplied by shipchandler.

  A . must replace B . must to be equipped C . has to be repaired D . have to be renewed

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• The connecting rod large end bearing shell generally has tags for location and oil grooves round the center of its axial length which correspond with grooves in the （） through which oil is transmitted up the rod to lubricate the small end.

  A . connecting rod B . piston rod C . bearing housing D . none of the above

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• Holes in the bulwark,Which allow deck water to drain into the sea, are（）.

  A . doggers B . fidleys C . freeing ports D . swash port

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• If clearance between a piston and the cylinder wall is excessive, piston slap will occurThe slap itself is caused by （）

  A . alternation of side thrust B . a breakdown of the lube oil film on the cylinder wall C . worn piston boss piston pin bearings D . fluctuating gas pressure in the combustion space

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• After arrived at the port, if it is necessary to lift the piston out and inspect the M-E temporarily, the chief engineer should report the situation to the（）, and the operation could be performed only after having the approvement of relevant department.

  A . maritime safety administration B . ship survey bureau C . company manager D . captai

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• After arrived at the port, if it is necessary to lift the piston out and inspect the M.Etemporarily, the chief engineer should report the situation to the____, and the operation could be performed only after having the approvement of relevant department.

  A.maritime safety administration B.ship survey bureau C.company manager D.captain

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• Ivan: I brought you the new Groove People CD.Dale: What good is a CD if I haven't got a CD player？ Ivan: I can bring you a CD player. Dale: What good is a CD player ifI don't even have electricity？ Ivan: ______ Dale: What good is calling the Electric Company if I haven't got a house？

  A．Why do you have so many questions？ B．what are you going to buy tomorrow？ C．Why don't you call the Electric Company？ D．Where did you buy the new CD？

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