A．air filtration is inadequate
B．engine coolant is leaking into the lube oil
C．fuel oil is leaking into the lube oil
D．the piston rings are excessive worn
[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]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]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]The primary duty of lube oil is to reduce （） between the working parts of an engine.A . power outputB . friction and wearC . indicated pressureD . rated horsepower
[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]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