When a diesel engine is operate at partial load, as compared to full load ,a decrease will occur in the average （）

A . White B . Black C . Blue D . Clear

A . radiated through the engine block B . transferred to water cooled cylinder walls C . conducted through the piston crown D . transferred to escaping exhaust gase

A . is coming upward；cylinder ring belt B . is going downward；piston ring belt C . is coming upward；piston ring belt D . is going downward；cylinder ring belt

A . ignition lag B . engine horsepower C . lube oil system pressure D . specific fuel consumptio

A . quantity of fuel injected is decreased B . quantity of fuel injected will always be increased C . start of injection is advanced D . duration of injection will always be greater

A . Ⅰ only B . Ⅱ only C . both Ⅰ and Ⅱ D . neither Ⅰnor Ⅱ

A . the exhaust will be clear B . fuel consumption will be low C . all the fuel will be burned at top dead center D . fuel consumption will be high

A . runs out of fuel B . has low lubricating oil pressure C . exceeds a set maximum speed D . has high cooling water temperature

A . the piston is just coming upward from the bottom dead center B . the piston has moved about one-fifth of the way up C . the piston has moved most of the way up and almost reached the TDC D . the piston has just past the TDC

A . maintain higher than normal jacket water temperature B . change the lube oil more frequently than normal C . maintain a higher air-box temperature than normal D . maintain a higher air-box pressure than normal

A . fuel control rack had admitted excessive fuel B . engine speed does not match the fuel rack setting C . engine has failed to reach its firing speed D . starter pinion and ring gear contact is not correct

A . thrust block B . sounding rod C . connecting rod D . push rod

A . dilutes the lube oil and reduces its viscosity B . forms sulfuric acid in the lube oil C . causes pitting and failure of the bearings D . causes sludge deposits on valve stem

A . an obstruction in an cylinder B . water accumulation in some engine cylinders C . low starting air pressure D . low scavenge air pressure

A . it gets dark in color B . a sample rubbed between fingers feels thin C . it has been in use for a specified interval D . it no longer supports combustio

A . lower the no-load RPMs B . provide more air for combine with the fuel C . increase the no-load RPMs D . provide more fuel combine with the air

A . diametrical tension B . gap clearance C . radial thickness D . face thickne

A . intake stroke B . compression stroke C . power stroke D . exhaust stroke

A . dwell-tachometer B . exhaust gas pyrometer C . fuel flow rate mete D . exhaust gas analyzer

A、A. turbine engine B、B. gas turbine C、C. steam engine D、D. internal combustion engine

A . filter to remove the fuel oil B . use the settler to remove the fuel oil C . remove the fuel oil by centrifuging D . drain and then renew the lube oil supply

A . Lube oil is diluted and its viscosity is reduced B . Sulfuric acid is formed C . Bearings become pitted ad immediately fail D . Valve stems develop sludge deposit

A . overloading the engine B . low exhaust valve lift C . excessive cylinder cooling D . insufficient mechanical clearance

A.lag behind the increased fuel supplied to the engine B.enter the engine along with the increase in the fuel C.enter the engine before the increased fuel supply D.leave the turbocharger as a negative pulse