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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 shells
B
main bearing
C
steel
D
bearing metal
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单选题On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an （）A
dial indicatorB
outside caliperC
bridge gaugeD
tram rod
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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
nipB
napC
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单选题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
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crushC
pitchD
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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
flashC
plateD
sheet
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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 gapB
the clearanceC
the boreD
the housing
考题
单选题Adjust （） by means of lead wire.A
the clearance of the main bearingB
the diameter of main bearingC
the gap of main beatingD
the tolerance of main bearing
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单选题A main bearing consists of two shells which are secured by means of studs and （）.A
tie rodsB
through boltsC
lead wiresD
bearing caps
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单选题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
crossheadB
crankpinC
crank journalD
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单选题Which of the listed bearing types is an example of a solid bearing?（）A
Piston wrist pin bushingB
turbine bearingC
Spring bearingD
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考题
单选题Shims of different thicknesses are inserted between the shells to enable adjustment of （）.A
the bearing clearancesB
the bearing thicknessC
the bearing strengthD
the bridge hardness
考题
单选题The main bearing metal is a lining （）.A
inside the bearingB
outside the bearingC
covering the crankshaftD
none of the above
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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, higherB
higher, smallerC
smaller, smallerD
higher, higher
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单选题Seamless mild steel is used for steam (also copper for moderate pressure and temperature), h-pair, feed discharge and all oil fuel pressure pipingsAccording to the above sentence, which of the following statements is not true?（）A
Both seamless mild steel and copper may be used for middle pressure steamB
hpair means high pressure airC
The feed piping of the boilers can be made of seamless mild steelD
All oil pipings are made of mild steel
考题
单选题Measure （） by means of lead wire.A
the clearance of the main bearingB
the play of the miler bearingC
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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
When plotted，their movements are usually abnormal
考题
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flat surfaceB
mirror finishC
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inclined surface
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worn main bearing journalsB
torsional stress deformationC
slack thrust bearingsD
bearing shells shim dimensions
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单选题To determine the main bearing clearance of a propulsion diesel engine, you should measure the main bearing shell using a ball anvil outside micrometer and measure the crankshaft journal using a/an （）A
telescopingB
ring ‘snap’ gaugeC
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outside micrometer
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单选题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 overheatedB
water was present in the oilC
the lube oil was not being properly filteredD
the maximum allowable bearing pressure had been exceeded
考题
单选题The design of （） is similar to that of the main bearing.A
the block bearingB
the camshaft bearingC
the connecting rod small end bearingD
the connecting rod large end bearing
考题
单选题The cylinder liners are made of （） and the cylinder surfaces are sometimes chromium-plated.A
steelB
copperC
cast ironD
stainless steel
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