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单选题
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 expansion
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音频出入的MAIN口和AUX口说法正确的是()
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单选题Worn main bearings in a diesel engine can result in （）A
decreased compression pressureB
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lower lube oil temperatureD
excessive leakage past the piston rings
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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Worn main bearing will cause the compression ratio of an auxiliary diesel engine to（）A
increaseB
decreaseC
remain the sameD
increase on compression decrease on expansion
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单选题Which of the listed bearing types is an example of a solid bearing?（）A
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turbine bearingC
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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
Decreased connecting rod bearing clearanceB
Increased connecting rod bearing clearanceC
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单选题Low compression of diesel engine may result from （）A
a worn cylinderB
broken piston ringsC
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none of the above
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单选题If the compression ratio is increased on any diesel engine, （）A
the expansion ratio will decreaseB
combustion will be slowed downC
thermal efficiency will decreaseD
thermal efficiency will increase
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单选题A distance piece, with ground faces, may be interposed between the rod and the bearing housing, its thickness being chosen to ensure the correct （）.A
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pressure ratioC
compression ratioD
clearance ratio
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单选题For a given fuel, a change in the compression ratio will affect the ignition lag by which of the listed means?（）A
An increase in compression ratio will increase the ignition lagB
An increase in compression ratio will decrease the ignition lagC
A decrease in compression ratio will decrease the ignition lagD
A decrease in ignition lag will increase the compression ratio
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单选题Measure （） by means of lead wire.A
the clearance of the main bearingB
the play of the miler bearingC
the gap of the main bearingD
the tolerance of the main bearing
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单选题Low compression results from （）.A
a worn cylinderB
broken piston ringsC
either A or BD
none of the above
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单选题If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably （）.A
misalignment or worn main bearingsB
insufficient cylinder lubricationC
defective or poorly fitted valvesD
all of the above
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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
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decreased bearing clearance
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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
inside vernier caliperD
outside micrometer
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单选题Which of the following relationships should occur between the temperature developed in a combustion space, and the compression ratio of the engine?（）A
Higher compression ratios create higher temperatureB
Higher temperatures create higher compression ratiosC
low temperatures create higher compression ratiosD
Higher compression ratios create low temperatures
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单选题If a diesel engines exhaust temperature is abnormally high, the cause could be（）A
too light of a loadB
injection timing is too earlyC
overloading of the engineD
too low of a compression ratio
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greater overall efficiencyB
greater fuel economyC
lower horsepowerD
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单选题A possible cause for an individual piston to knock when at TDC on a slow-speed, two-stroke/cycle main propulsion diesel engine could be due to （）A
early fuel injectionB
excessive bearing play within the running gearC
overloading of the cylinderD
all of the above
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