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单选题
The bearing shells depend on the accuracy of （） to held them in a truly circular shape.
A
the gap
B
the clearance
C
the bore
D
the housing
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单选题Which is not the maintenance work for shaft bearings in transmission system?（）A
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check them for leakagec through end sealsC
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单选题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
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单选题The main bearing shells often have a thin （） of lead or indium to provide a layer giving protection against corrosion.A
flangeB
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plateD
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单选题As to the bearing, of the following, which statement is not true?（）A
ff overheat is found, the engine must be stopped for inspectionB
Much heat of the crankcase door indicates that the bearing is overheatedC
If bearing clearance is too large, knocking will be heard in the crankcaseD
If bearing clearance is too large or too small, the white metal may be melted
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单选题A main bearing consists of two shells which are secured by means of studs and （）.A
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单选题In the management of the shafting, because（） carry heavy load and caused high temperature easily, it should be paid attention.A
the bearing near to the diesel engineB
the intermediate bearing near to the thrust bearingC
the intermediate bearing near to the sterntubeD
the bearing located at the middle of the diesel engine and the sterntube
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单选题Shims of different thicknesses are inserted between the shells to enable adjustment of （）.A
the bearing clearancesB
the bearing thicknessC
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单选题Which of the following operating conditions can occur when shims are removed from the joint between the foot of a marine type diesel engine connecting rod and the bearing box?（）A
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单选题It has been held that the Shipowner will be liable for the loss of or damage to the goods even if this is due to excepted perils，unless he can prove that he has（）proper care of them whilst they were in his custody.A
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takenC
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单选题The external circumference of a pair of main bearing shells is slightly （） that of the bore of the housing which receives themWhat’s the meaning of “that” in the sentence above?A
less thanB
lighter thanC
larger thanD
smaller than
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单选题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 thanB
lighter thanC
larger thanD
smaller than
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单选题An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer’s vessel. Which of the following is NOT a characteristic of indirect echoes?（）.A
Their bearing is almost constant，even when the true bearing of the contact changes appreciablyB
They always appear on a bearing of 90°from the true bearing of the contactC
The indirect echoes usually appear in shadow sectorsD
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单选题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 shellsB
main bearingC
steelD
bearing metal
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单选题Crank web deflection readings will give a positive indication of （）.A
worn main bearing journalsB
torsional stress deformationC
slack thrust bearingsD
bearing shells shim dimensions
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单选题The insertion of shims between the foot of a marine type connecting rod and a bearing box would result in （）A
increased compression ratioB
decreased compression ratioC
increased bearing clearanceD
decreased bearing clearance
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单选题Lubricating oil used in a diesel engine serves to（）A
reduce the wear of bearing surfacesB
cool the bearing surfacesC
assist in sealing bearing surfacesD
all of the above
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单选题Which of the following radar contacts will present the most immediate danger?（）.A
A vessel on the starboard bow whose bearing is changing and range is decreasingB
A vessel on the starboard bow whose bearing is steady and range is increasingC
A vessel on the port bow whose bearing is steady and range is decreasingD
A vessel on the port bow whose bearing is changing to the left and range decreasing
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单选题The shells are secured by means of bearing caps and studs, the necessary clearance being provided by means of （） of different thickness.A
shimsB
packingC
glandsD
washers
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