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单选题
scraper（）
A
扳手
B
刮刀
C
羊角锤
D
锤子
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更多 “单选题scraper（）A 扳手B 刮刀C 羊角锤D 锤子” 相关考题
考题
第二组Under normal operation, some lubrication oil mist may be discharged from the air compressor to the air start system. This oil may be from excess compressor cylinder lubrication, from faulty oil scraper rings, or may even be suspended oil vapor contaminating the engine room atmosphere and drawn in at the compressor suction. Oil discharge is kept to a minimum by draining the after cooler, air receiver and starting system. If small quantities of lubrication oil do get passed into the starting air system, they will deposit as thin moist film over internal pipe surfaces but are not readily combustible. If a cylinder non-return valve leak while the engine is in operation, some hot gas, possibly with unburned fuel and cylinder lubrication oil, may be blown through the valve to the adjacent air manifold. With further heating from the leaky valve, this, together with the already deposited oil film, will carbonize and form. incandescent carbon. If starting air is applied to the system while still hot, the high pressure air coming into contact with the burning carbon may cause an explosion. Such an explosion will cause a flame to pass back through the air start pipe system, evaporating the deposited oil film and igniting it in the presence of air. Very high velocities and shockwaves are generated which may rupture pipes and fittings.Alternatively, if excessive oil has entered the air start system, a mixture of air and oil droplets may be discharged through the open cylinder non-return valve during starting. This spray may ignite due to high temperatures in the cylinder, causing a flame through the still open valve to the air manifold.To prevent an explosion, air start valves must be correctly maintained and lubricated to ensure correct timing and free movement with positive closing. Oil in the system must be kept to a minimum, pipe lines must be drained and cleaned internally when necessary and oil discharge from air compressors must be kept to a minimum by good maintenance.The passage is mainly aboutA.crankcase explosionB.scavenge box fireC.starting air pipeD.the danger of explosion in the starting air system
考题
用敲锈锤敲去厚锈。（）A、Heavy rust is removed with a chipping hammer.B、Loose paint and scale is removed with a scraper.C、Heavy rust is removed with a scraper.D、Loose paint and scale are removed with a chipping hammer.
考题
Loose paint and scale are removed with a scraper.（）A、用敲锈锤铲去重锈。B、用敲锈锤铲去起泡的油漆和锈皮。C、用刮刀铲去起泡的油漆和锈皮。D、用刮刀铲去重锈。
考题
单选题Loose paint and scale are removed with a scraper.（）A
用敲锈锤铲去重锈。B
用敲锈锤铲去起泡的油漆和锈皮。C
用刮刀铲去起泡的油漆和锈皮。D
用刮刀铲去重锈。
考题
单选题White smoke exhausting from a diesel engine can be caused by （）A
low combustion temperatureB
a leaking fuel nozzle check valveC
late fuel injectionD
plugged oil-scraper ring hole
考题
单选题Why are some diesel engine cylinder liners plated on the wearing surface with porous chromium?（）A
The chromium will not wear out the piston ringsB
The chromium strengthens the liners in the way of the scavenging air portsC
Chromium eliminates the need for oil scraper ringsD
Pores in the plating aid in maintaining the lube oil film
考题
单选题刮刀用来铲去起泡的油漆和锈皮。（）A
Loose paint and scale is removed with a scraper.B
Heavy rust is removed with a scraper.C
Loose paint and scale is removed with a chipping hammer.D
Heavy rust is removed with a chipping hammer.
考题
单选题Which of the listed devices could be used as a substitute for a ring grooving tool?（）A
Steel brushB
Fine emery cloth or steel woolC
A section of the removed compression ringD
A case hardened scraper
考题
单选题Diesel engine blow-by is the leakage of combustion gases past the （）A
oil rings onlyB
compression and scraper ringsC
cylinder liner sealingsD
cylinder liner ring grooves
考题
单选题To minimize corrosion, fuel oil strainer disks, spacers and scraper blades are made of （）.A
brassB
copperC
ironD
monel metal or stainless steel
考题
单选题The main purpose of the piston oil scraper rings is to （）.A
seal the space between the piston and the linerB
reduce the amount of lube oil burned in the combustion chamberC
transmit heat from the piston to the cylinder linerD
damp out fluctuations of the piston side thrust
考题
单选题Which of the listed devices could be used as a ring groove tool during preparation for the installation of new rings?（）A
Steel brushB
Fine emery cloth or steel woolC
A section of the removed compression ringD
A case hardened scraper
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