The primary duty of lube oil is to reduce （） between the working parts of an engine.

[单选题]The quality of the fuel oil and lube oil （）, Im afraid.A . has much to do with the operation of the engine and its lifeB . have much to do with the operation of the engine and its lifeC . has much doing with the operation of the engine and its lifeD

[主观题]What causes the lube oil pressure of the engine to drop ?

[单选题]For a main diesel engine the lube oil in the bearings is drawn from （）, usually located in the bedplate.A . a gravity tankB . a sumpC . a vesselD . a bottle

[单选题]The lube oil cooler is located after the lube oil filter in order for （）A . the filter to operate more efficientlyB . the lube oil cooler to be bypassedC . positive lube oil pump suction to be assuredD . galvanic action in the cooler to be minimized

[单选题]The lube oil to lubricate the surfaces of the cylinder liners is spread over by the （）.A . sliding piston ringsB . engines camshaftC . small pumpsD . forced feed system

[单选题]Lube oil cannot be efficiently filtered if its （）.A . viscosity is too lowB . temperature is too lowC . pump discharge pressure is higher than the systems pressureD . pump capacity is greater than the systems need

[单选题]If a used lube oil analysis indicates excessive chromate content, this meansA．air filtration is inadequateB．engine coolant is leaking into the lube oilC．fuel oil is leaking into the lube oilD．the piston rings are excessive worn

[单选题]Lube oil filters remove contaminants more efficiently if the oil being filtered is （）.A . under high pressureB . under low pressureC . heated to reduce viscosityD . cooled to increase viscosity

[单选题]In a diesel engine lube oil system, which of the following parts should be lubricated first?（）A . Camshaft beatingsB . Main bearingsC . Piston crownsD . Cylinder wall

[单选题]Lube oil pumps taking suction from the sump of most small marine engines are usually （）.A . of the diaphragm typeB . of the centrifugal typeC . of the positive displacement typeD . independently driven by electric motor