If a diesel engine turned over freely but failed to start, the cause could be ________.

A．water in the fuel

B．cold lube oil

C．excessive starting air pressure

D．excessive fuel pressure

[单选题]The heart of the diesel engine is the （） where the fuel is burnt and the power developed.A . crankcaseB . cylinderC . scavenge boxD . pisto

[单选题]The diesel engine is a type of （）.A . turbine engineB . gas turbineC . steam engineD . internal combustion engine

[单选题]_____ the engines, the diesel engine is ____ used engine on boardA．Between / more commonlyB．Among / the most commonlyC．Between / not more commonlyD．Among / not the most commonly

[单选题]D．iesel engine blow-by is the leakage of combustion gases past the( ).A．oil rings onlyB．compression and scraper ringsC．cylinder liner sealingD．cylinder liner ring grooves

[单选题]Overspeed of the diesel engine driving an electric generator could cause（）.A . low voltage tripB . reverse power tripC . damage to windingsD . excessive exhaust temperature

[单选题]Maximum horsepower of a diesel engine is attained （）.A . when the engine RPM is pulled down by overloadB . at rated engine RPMC . at 95 % of rated engine RPMD . at 95 % of a properly adjusted governor RPM with the engine under full load

[单选题]The highest pressure in a diesel engine cylinder normally occurs （）.A . at TDCB . before TDCC . after TDCD . during air starting

[单选题]A diesel engine is operating with excessively high exhaust temperatures at all cylindersTo correct this condition, you should FIRST （）.A . reduce the engine loadB . increase the cooling water flowC . increase the lube oil pressureD . adjust the fuel

[单选题]If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.A . compression pressures are below normalB . lube oil is diluted with fuel oilC . cranking speed is too lowD . exhau

[单选题]A diesel engine with a combustion chamber located between the crowns of two pistons is known as a/an （）.A . double-acting engineB . opposed pistons engineC . single-acting engineD . horizontal acting engine