The cooling water of the diesel engine should be treated with chemical, because it contain

A.discharge side of the centrifugal pump

B.suction side of the centrifugal pump

C.the lowest point of the cooling water system

D.inlet of the main engine

A.An alarm device with audible and visible signals is required for all cooling water systems

B.Propulsion engines with bores over 200 mm are to be fitted with cooling water jackets

C.Each totally enclosed cooling system shall be provided with a suitable head tank

D.Drain cocks are to be provided at the lowest points of all cylinder water jackets

The fresh water generator produces fresh water _____.

A.by cooling sea water

B.by heating sea water

C.by evaporation of sea water

D.by purifying sea water

Fresh water is used for the cooling of cylinder jackets and () of the marine diesel engine

A.cylinder covers

B.lubricating space

C.crosshead

Large quantities of water ____________cooling purposes.

A、are needed for

B、is needed to

C、are need to

D、is need for

The cooling water temperature should be gradually reduced over a period of (),and then shut down

A.8 hours

B.8 minutes

C.8 days

The cooling liquid used for the cylinder may be referred to as _____.

A.jacket water

B.make-up water

C.boiler water

D.flushing water

High diesel engine cooling water temperatures can be caused by _____.

A.a worn water pump

B.not enough coolant

C.air in the cooling system

D.all of the above

A.the temperature of the hydraulic fluid

B.the flow rate of the hydraulic fluid

C.the temperature of the cooling water

D.all of the above

A．worn water pump

B．not enough coolant

C．air in the cooling system

D．all of the above

A.overcooling

B.poor cooling

C.overloading

D.unloading