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单选题
An efficient seal between the cylinder block and cylinder heads on many diesel engines is obtained with（）
A
graphite packing
B
sealing compound
C
lubricating oil
D
gaskets
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单选题The （） chamber is enclosed between the cylinder head and piston.A
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Block cooling water passages to the headD
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单选题Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause （）.A
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free the liferaft from the vesselD
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单选题Cylinder liners from older lower powered engines had a uniform wall thickness and the cooling was achieved by circulating cooling water through a space formed between （）.A
crown and skirtB
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单选题Low compression pressure in a diesel engine can be caused by（）A
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leaking cylinder liner seal ringsC
late fuel injection timingD
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单选题In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.A
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单选题In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessiveIn order to correct for this, you should（）A
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build up the cylinder head by metal sprayingC
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A radial piston pump houses sliding pistons in a stationary cylinder block through which passes a rotating pintle or ported shaftC
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the cylinder coverC
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connecting rodsB
piston rodsC
tie rodsD
jack-bolts
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单选题The cylinder covers and the liners are bolted together by means of （）.A
bolts welded into the cylinder headB
bolts welded into the cylinder framesC
studs screwed into the cylinder headD
studs screwed into the cylinder frames
考题
单选题If clearance between a piston and the cylinder wall is excessive, piston slap will occurThe slap itself is caused by （）A
alternation of side thrustB
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make certain the gasket seal between the nozzle and cylinder head is tight
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jack-boltsC
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