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

相似题目

• （） are formed by abrasive particles entering the bearing and scoring the shaft.

  A . Grooves B . Recesses C . Ridges D . Ni

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• The bearings used to support the crankshaft are generally called （）

  A . line shaft bearings B . connecting rod beatings C . main bearings D . support bearing

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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 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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• 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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• 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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• 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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• （） 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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• Doors are generally formed in the （） of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end bearing.

  A . bedplates B . columns C . cylinder blocks D . safety ca

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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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• Precision engine bearing inserts are manufactured with a small portion of the bearing ends extending beyond the bearing housing or capsThe installation process of these bearings requires sufficient （）.

  A . overlap B . crush C . lap or lead D . protrusio

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• What are the characteristics of a bear market?

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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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• North American fur trade ______ in the early 1800' s mainly due to the diminishing number of fur-bearing animals.

  A．ceased B．staggered C．waned D．collapsed

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