Worn main bearing will cause the compression ratio of an auxiliary diesel engine to（）

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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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• The main bearings are provided with thin-walled （）, lined with a copper-lead alloy.

  A . steel guides B . steel shells C . steel bearing caps D . pig iro

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• For a main diesel engine the lube oil in the bearings is drawn from （）, usually located in the bedplate.

  A . a gravity tank B . a sump C . a vessel D . a bottle

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• Which of the following may take place if the clearance of the main bearings are excessive?（）

  A . bearing knocks B . dropping of pressure of LO C . noises D . all the above

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• Worn main bearings in a diesel engine can result in （）

  A . decreased compression pressure B . increased lube oil pressure C . lower lube oil temperature D . excessive leakage past the piston ring

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• While inspecting the main bearings on a diesel engine you find impregnated dirt and scratches in the bearing surface you would, therefore, suspect that （）

  A . the bearing had been overheated B . water was present in the oil C . the lube oil was not being properly filtered D . the maximum allowable bearing pressure had been exceeded

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• On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lubricating oil from （）.

  A . a spindle lubricator B . an oil jet C . internal splashing D . drilled passages in the crankshaft

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• The main bearing shells are made of steel with a lining of bearing metal which may be white metal, copper-lead or aluminum-tin alloy What is the meaning of “which” in the sentence above?（）

  A . main bearing shells B . main bearing C . steel D . bearing metal

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• In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the （）.

  A . crosshead B . crankpin C . crank journal D . gudgeon pi

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• It is well known that good lubrication will （） the bearings from becoming overheated.

  A . present B . prevent C . avoid D . provide

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• Diesel engine main and connecting rod precision bearings are made in halvesEach half exceeds one-half the bearing circumference by a small amountThe small amount is termed （）.

  A . clearance B . crush C . pitch D . thrust

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• The main bearing metal is a lining （）.

  A . inside the bearing B . outside the bearing C . covering the crankshaft D . none of the above

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• On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by （）.

  A、banjo feed B、splash feed C、gravity feed D、pressure feed

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• On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an （）

  A . dial indicator B . outside caliper C . bridge gauge D . tram rod

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• In some modern large diesel engines, which of the following is used as the support for the main bearings?（）

  A . Bedplate B . Block C . Base D . Sum

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• The highest loads applied to the diesel engine crankshaft main bearings are （）

  A . axial loads B . firing loads C . inertia loads D . centripetal load

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• In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a （） in the crankshaft to the bottom end bearing andthen up a connection rod to the gudgeon pin.

  A . telescopic pipes B . large bore C . drilled passage D . tied rod

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• In most pumps and pump motors overpacking the ball bearings full of grease will result in （）

  A . moisture emulsification of the bearing grease B . insufficient circulation and overheating of the bearing C . proper grease circulation to cool the bearing D . sliding friction between balls and race

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• In motor-ships, （）, after passing through main and motion bearings and oil cooled pistons, etcis either retained in the bedplate.

  A . the fuel oil B . the lubricating oil C . the refrigerating oil D . the hydraulic oil

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• （） clearances in the main or crank pin bearings will sometimes be indicated by loss of pressure in the lubricating system before any bearing knock is heard.

  A . Too larger B . Too smaller C . Excess D . Excessive

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• A main bearing consists of two shells which are secured by means of studs and （）.

  A . tie rods B . through bolts C . lead wires D . bearing ca

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• What are the two main recurring symbols in “A Worn Path”?

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• 62. A true bearing of a charted object，when plotted on a chart，will establish a ______.

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• What is the main reason of the reduction of the grizzly bears' number？

  A．Lacking food. B．Forest deceasing. C．The coyote existing. D．Not clear yet.

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