The main bearing metal is a lining （）.

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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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• The external circumference of a pair of main bearing shells is slightly larger than that of the bore of the housing which receives themThe difference is termed （）.

  A . nip B . nap C . gap D . li

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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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• 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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• 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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• You are inspecting the lower main precision bearings on a diesel engine.You observe that about half the thin Babbitt linings are of a milky white colourThis condition is caused by （）

  A . large dirt particles in the oil supply B . insufficient lubricating oil and overheating C . normal wear D . water contamination of the lube oil

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• In the shafting management （） should be paid more attention. Ⅰ.f the while metal tailshaft bearing is dripping oil Ⅱ.f some area become blue during the running Ⅲ.he deformation of crankshaft

  A . Ⅰ B . Ⅱ C . Ⅲ D . Ⅱ+Ⅲ

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

  A . increase B . decrease C . remain the same D . increase on compression decrease on expansio

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• An acceptable method of measuring for the correct rotational force applied to the connecting rod and main bearing bolts, is to use a（）

  A . torque wrench B . monkey wrench C . pipe wrench D . slugging wrench

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• The grab rail of a metal lifeboat is normally located（）.

  A . along the turn of the bilge B . along each side of the keel C . near the top of the gunwale D . at the bow and at the ster

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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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• 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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• Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）

  A、a circulating system; a total loss system B、a total loss system; a circulating system C、an opened system; a closed system D、a closed system; an opened system

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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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• Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because（）.

  A . The direction of pressure on the journal in four-stroke engine is continuously B . positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine C . four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines D . Low-stroke engines usually consume less lube oil than four-stroke engine

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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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• An acceptable means of tightening connecting rod and main bearing cap bolts is to measure the （） Ⅰ.torque applied to each nut and bolt assembly Ⅱstretch of each nut before and after tightening

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

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• The ship’s bearing is 145°（）the Lighthouse.

  A . in B . on C . for D . from

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• The external circumference of a pair of main bearing shells is slightly （） that of the bore of the housing which receives them Whats the meaning of “that” in the sentence above？

  A . less than B . lighter than C . larger than D . smaller tha

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• In order to improve the working conditions of the crosshead bearings, the bearing pressure is made and the peripheral speed is made in later designs（）

  A . smaller, higher B . higher, smaller C . smaller, smaller D . higher, higher

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• In a rolling process, the metal is ( )

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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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