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单选题
Which of the following statements concerning cylinder liner wear is true?（）
A
Liner wear is distributed equally between the upper and lower portions of the cylinder
B
Excessive liner wear causes wear between piston ring and groove
C
Excessive, but uniform liner wear will not cause wear between piston ring and groove
D
Liner wear is normally greatest in the middle of the cylinder
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更多 “单选题Which of the following statements concerning cylinder liner wear is true?（）A Liner wear is distributed equally between the upper and lower portions of the cylinderB Excessive liner wear causes wear between piston ring and grooveC Excessive, but uniform liner wear will not cause wear between piston ring and grooveD Liner wear is normally greatest in the middle of the cylinder” 相关考题
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Energy can be created or destroyedB
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None of the above
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单选题Which of the following operation will have a direct impact on the rate of wear in a cylinder liner （）A
amount of scavenge air to the cylinderB
quality of fuel injectedC
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Cargoes are any type of goods transported by any type of shipsB
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单选题In addition to lubricating, cylinder oil assists in forming a gas seal and contains （） which clean the cylinder liner.A
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weldedB
replacedC
drilled againD
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单选题Which of the following statements concerning butterfly valves is correct?（）A
Special tools are required for lapping or grindingB
It is impossible to throttle flow with a butterfly valveC
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The butterfly valve should never be used in a freshwater system
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单选题Which of the listed cylinder liner surface conditions indicates proper lubrication?（）A
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Bright appearanceC
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wet linerC
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corrugated liner
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单选题In a diesel engine, an integral liner is one in which the cooling water （） Ⅰ.flows through the cylinder liner jackets Ⅱ.touches the outer side of the linerA
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Ⅱ onlyC
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neither Ⅰ and Ⅱ
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单选题Which of the following statements is true concerning centrifugal pumps?（）A
They are particularly suited for pumping high viscosity fluidsB
They are started with the discharge valve openedC
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The greater the atomization, the greater the penetrationB
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单选题On the top of the cylinder is mounted the cylinder cover which is pressed onto （） of the cylinder liner by means of nuts and studs.A
the camshaftB
the flangeC
the ridgeD
the bulge
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单选题Which of the following statements is/are true regarding hydraulic pumps in general? （）A
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考题
单选题There is a support ring between the cylinder block and collar of the cylinder liner, thus carrying both the liner and the cylinder coverIt also passes to the cooling bores and to the cover（）A
cooling waterB
cooling oilC
refrigerantD
lubricate oil
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单选题Which of the following statements is correct concerning the viscosity of lubricating oil?（）A
Viscosity will increase as temperature increasesB
Viscosity is a measure of a fluid s internal resistance to flowC
Viscosity will decrease as temperature decreasesD
Viscosity is not dependent on temperature
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单选题Which of the following problems may occur if the clearance between a piston and cylinder liner is insufficient?（）A
Excessive wearB
Scuffing of the linerC
Piston seizureD
All of the above
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单选题Before engaging the turning gear and turning the diesel engine, which of the following operation should be done except（）A
open the indicator cocksB
supply some CYL Oil to cylinder liner wall with lubricator (only for two stoke diesel engine)C
put the fuel handle in the “stop” positionD
pump up the air bottle
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单选题The exhaust ports are located around the lower part of the cylinder liner, （）the products of combustion are driven by scavenging air.A
in whichB
by whichC
through whichD
from which
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