Worn out ring grooves should be （） to standard dimension after being welded.

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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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• 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 loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）

  A . Low compression pressure and high exhaust temperature B . Low firing pressure and high exhaust temperature C . Low compression pressure and low exhaust temperature D . Low firing pressure and low exhaust temperature

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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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• In large marine diesel engines cylinder oils usually contain additives formulated to impart the （） to clean the rings and grooves.

  A . inefficiency B . oiliness C . detergency D . purity

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

  A . The oil control rings will seal improperly and wear rapidly B . The piston will overheat due to insufficient lubrication C . Excessive oil will remain on the cylinder wall D . Light brown smoke will emanate from the engine exhaust

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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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• 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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• 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 winch is liable（）worn-out in this way.

  A . getting B . to get C . to have got D . for getting

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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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• A number of bags are worn-out（）a certain extent.

  A . at B . in C . on D . to

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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 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 worn-out bags are all second-hand ones（）stated in the shipping order.

  A . so B . as C . that D . like

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• If you were operating a centrifugal water service pump with worn wearing rings, the （）.

  A . pump would be very noisy B . pump would vibrate excessively C . pump would develop insufficient flow D . stuffing box would leak excessively

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• In western culture, wedding rings are worn on right hand.( )

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• The children, ______ had played the whole day long, were worn out.

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• My shoes have been worn out. Ill have to buy._____.

  A．some new pair B．a new one C．some new ones D．a new pair

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• He is quite worn out from years of hard work. He is not the man______he was twenty years ago.

  A．which B．that C．who D．whom

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• He put his hands in the worn－out jeans and took out _______ pennies.

  A.a handful of B.the hand of C.a hand of D.the handful of

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• 请找出下列句子中需要首字母大写的单词并将正确答案填入空中。 Just as an alarm started ringing, Cindy came out of the building shouting, “help! There’s a fire in the barn!”

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