The bearing of tailshaft sealing equipment, which adopting the oil nature circulation is hot, the reason is（）

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• Water lubricated tailshaft bearings wear,（）

  A . the after one is more than forward one B . the forward one is more than after one C . the forward one is the same with after one D . it depends on the type of engine

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• As to the bearing, of the following, which statement is not true?（）

  A . ff overheat is found, the engine must be stopped for inspection B . Much heat of the crankcase door indicates that the bearing is overheated C . If bearing clearance is too large, knocking will be heard in the crankcase D . If bearing clearance is too large or too small, the white metal may be melted

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• The size of ball and roller bearings can be identified by the （）.

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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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• 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?（）

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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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• Which of the listed bearing types is an example of a solid bearing?（）

  A . Piston wrist pin bushing B . turbine bearing C . Spring bearing D . Diesel engine main bearing

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• The main advantage of improved Simplex tailshaft seal are（）

  A . the good sealing performance and the simple structure B . the good sealing performance and the short life expectancy C . the good sealing performance but the short life expectancy D . the good sealing performance and the lower cost

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  A、did not appreciably change B、does not appreciably change C、do not appreciably change D、not appreciably change

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  A . Prevents lateral movement of the slow speed gear B . Transmits propeller thrust to the hull C . Keeps spring bearings in line D . Prevents main reduction gear axial movement

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

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