Re-circulating the fuel when the engine is stopped can______.①keep the fuel at the correct viscosity ②cool the injector

A．①

B．②

C．①②

D．neither ① nor ②

[单选题]On a diesel engine, fuel is delivered into the combustion space by （）.A . a cooling systemB . a lubrication oil systemC . an electric systemD . an injection system

[单选题]Engine fuel pump index is （）.A . the viscosity indexB . the fuel oil contentsC . the starting speedD . the reading at the rack

[单选题]In an ordinary diesel engine the fuel injection begins （）A . after TDCB . before TDCC . after BDCD . before BDC

[单选题]The engine in a covered lifeboat is fueled with（）.A . keroseneB . unleaded gasolineC . diesel oilD . liquefied ga

[单选题]If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will_________.A．backfire through the air intakesB．develop less power under loadC．have high firing pressuresD．li

[单选题]The fuel oil system for a diesel engine can be considered in two parts--the fuel supply and the （） systems.A . fuel treatmentB . fuel combustionC . fuel injectionD . fuel separating

[单选题]In a diesel engine, fuel must be broken up into a spray of fine droplets to （）.A . increase its qualityB . obtain complete burningC . reduce its weightD . all of the above

[单选题]Fuel is admitted to a diesel engine cylinder through the （）.A . intake valvesB . carburetorC . exhaust portsD . injector nozzle

[主观题]when the fuel is provided by the supplier ,what specifications of the oil can you get from the supplier receipt ?

[单选题]The engine has one or two group of fuel pumps, depending upon （）.A . the number of fuel valvesB . the number of cylindersC . the speed of engineD . the power of engine