问题：
[单选] Engine fuel pump index is （）.
the viscosity index。the fuel oil contents。the starting speed。the reading at the rack。
问题：
[单选] Excessive clearances in the main or crank-pin bearings will sometimes be indicated by （） before any bearing knock is heard.
loss of flow in the fuel system。loss of pressure in the air system。loss of flow in the lubricating system。loss of pressure in the lubricating system。
问题：
[单选] Exhaust temperature increases in all cylinders, the possible cause may be（） (1) increased scavenging air temperature (2) air in fuel pumps and fuel valves (3) fouling of air and gas passages
(1)+(2)。(1)+(3)。(2)+(3)。(1)+(2)+(3)。
问题：
[单选] Expansion tank should be used to remove （） from cooling water.
scale。sludge。chemicals。air。
问题：
[单选] Factor influencing the position of the interface between the liquid seal and the oil in a purifier is （）.
throughput。back pressure。gravity disc。None of the above is wrong。
问题：
[单选] Failure of fuel injection is usually due to trouble in the （）.
exhaust valves。mechanical lubricators。cooling water pumps。fuel injection pum。
问题：
[单选] Fix the fuel injector into （） after repair.
the cylinder liner。the cylinder cover。the cylinder jacket。the pisto。
问题：
[单选] For a diesel engine, when the piston is at the （）, the clearance volume is the largest.
TDC。DTC。BDC。DBC。
问题：
[单选] For a main diesel engine the lube oil in the bearings is drawn from （）, usually located in the bedplate.
a gravity tank。a sump。a vessel。a bottle。
问题：
[单选] For an ordinary four-stroke diesel engine the exhaust valves close （）.
after TDC。before TDC。after BDC。before BDC。
