A . slight acidity
B . slight alkalinity
C . excessive alkalinity
D . excessive acidity
[单选题]In a diesel engine cooling water system, a pH of 60 indicates a/an ().A . slightly acidic conditionB . slightly alkaline conditionC . overtreatment of waterD . neutral condition of water
[单选题]The cooling water of the diesel engine should be treated with chemical, because it contains .A.alkaliB.acidityC.salinityD.impurity
[单选题]High diesel engine cooling water temperatures can be caused by ().A . a worn water pumpB . not enough coolantC . air in the cooling systemD . all of the above
[单选题]There is () in any water cooling system for a diesel engine allowing for expansion and water make-up in the system as well as air vent and chemicals addition.A . a setting tankB . a service tankC . a head tankD . an expansion joint
[单选题]In the closed cooling system, the water ().A . is made to circulate out of the systemB . is made to circulate within the systemC . is made circulate within the systemD . is made circulate out of the system
[单选题]Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause ().A . low compression pressureB . increased piston wearC . increased cylinder lube oil consumptionD . poor contact between compression rings and l
[单选题]For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an ().A . oil sprayB . oil bathC . oil control ringsD . drilled passage through the camshaft
[单选题]The pH value of water in a diesel engine closed cooling water system should be maintained between ().A . 60 to75B . 80 to 95C . 100 to 115D . 120 to 135
[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]Diesel engine jacket water is used in the distillation process as the ().A . coolant for the distillateB . coolant for the brine coolerC . means of heating the feedwaterD . primary means of producing a vacuum within the distiller