Question 1: One of the functions of lubricant additives is to: A - Increase effects of gas dilution B - Decrease effects of gas dilution C - Promote oxidization D - Decrease wetability
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Question 2: One of the functions of lubricant additives is to: A - Increase the lubricant pour point B - Decrease detergency C - Depress the lubricant pour point D - Increase effects of gas dilution _______________________________________________
Question 3: For external lubrication of reciprocating compressors using a pressure type of lubrication system, oil is: A - Pumped from the bearings to the crankcase B - Supplied directly from the feedstock within the compressor lines C - Splashed to the bearings using the movement of the crankshaft D - Pumped from the crankcase to the bearings _______________________________________________
Question 4: In a small, single-acting reciprocating compressor that uses the splash system for lubrication, the oil is: A - Pumped from the bearings to the crankcase B - Splashed from the compressor shaft to the crankshaft and connecting rod bearings C - Pumped from the crankcase to the bearings D - Splashed to the bearings using the movement of the crankshaft _______________________________________________
Question 5: In large reciprocating compressors, a mechanical lubricator that feeds oil directly to the cylinder walls is driven by the: A - Rings or a drive chain B - Compressor cylinder rods C - Crankcase bearings D - Crankshaft _______________________________________________
Question 6: Internal lubrication of a reciprocating compressor refers to: A - Lubrication of the vanes and casing walls B - Lubrication of the cylinder walls and pistons C - Lubrication of the cylinder valves D - Lubrication of the stuffing box _______________________________________________
Question 7: In terms of lubrication requirements, the greatest advantage of dynamic compressors (such as the centrifugal and the axial flow) over other designs is that: A - They do not require internal lubrication B - They do not require external lubrication C - Internal lubricators can be driven directly by the compressor driver D - Less internal lubrication is required because there is no reciprocating motion _______________________________________________
Question 8: In an arrangement where each cylinder may have one or more points to which the oil is pumped: A - A separate pump unit of the lubricator should feed each of these points B - The pressure lubricator discharges the oil into the gas intake C - A splash lubrication system is best D - One pump unit is adequate _______________________________________________
Question 9: In sliding vane rotary compressors, internal lubrication is often supplied by: A - A system where oil is splashed to the bearings using the movement of the crankshaft B - The compressor piston, which spreads the oil over the cylinder walls C - The electric motor that is driving the compressor D - A pressure lubricator _______________________________________________
Question 10: By definition, internal lubrication is not required by: A - Cylinder walls B - Connecting rod bearings C - Rotary compressor vanes D - Centrifugal compressor impellers _______________________________________________
Question 11: The lubrication supply for crankshaft bearings, connecting rod bearings and crosshead on reciprocating compressors, as well as rotor shaft bearings on rotary and dynamic compressors is an ____________ type. A - internal B - external C - none of these D - either of these _______________________________________________ Question 12: In reciprocating compressors where a pressurized lubrication delivery system is used, a pump driven by the ________________ delivers oil to the crankshaft and connecting rod bearings. A - external driver B - compressor shaft C - valve unloader D - casing _______________________________________________
Question 13: The viscosity index of a lubricant is: A - A measure of the ability of an oil to resist the thinning effect caused by increasing the oil temperature B - A measure of the ability of the lubricant to adhere to metal surfaces C - A measure of the ability of an oil to reduce corrosion D - The "slipperiness" or ability of a lubricant to decrease friction. _______________________________________________
Question 14: In a force-feed lubrication system, the system must be designed to provide _________________ to force feed the lubricator or pump. A - mechanical energy B - positive pressure C - a gravity feed D - negative pressure _______________________________________________
Question 15: In sliding vane rotary compressors, a pressure lubricator supplies the oil and may discharge the oil: A - Into the gas discharge B - Along the cylinder walls C - Into the gas intake D - To the rings or a drive chain _______________________________________________ Question 16: In a sliding vane compressor where the oil supplied by a pressure lubricator discharges into the gas intake, the oil is: A - Discharged to the crankcase B - Carried by the gas to the rotating vanes C - Splashed onto the cylinder walls D - Spread by the cylinder head _______________________________________________
Question 17: The "wetability" of a lubricant refers to the lubricants ability to:
A - Decrease friction B - Inhibit oxidation C - Adhere to metal surfaces D - Resist the thinning effect caused by increasing oil temperature _______________________________________________
Question 18: A lubricant: A - Eliminates corrosion B - Eliminates friction between two metallic surfaces C - Separates metallic surfaces and helps reduce the wear caused by friction D - Eliminates the wear of two metallic surfaces _______________________________________________
Question 19: Lubrication is a vital part of compressor operation aimed at:
A - Sealing and corrosion reduction B - Eliminating friction and wear C - Reducing wear caused by friction D - Shock absorption and wear reduction _______________________________________________
Question 20: The "lubricity" of a lubricant refers to: A - The lubricants ability to resist the thinning effect caused by increasing oil temperature B - The lubricants ability to reduce gas dilution C - The lubricants ability to decrease friction D - The lubricants ability to adhere to metal surfaces
