更多"Excessive lubricating oil consumpti"的相关试题:
[单项选择]Excessive lube oil consumption by a reciprocating air compressor can be caused by （）.
A. using a slightly dirty air filter
B. using oil having an excessive viscosity
C. intercooler or after-cooler leaks
D. carrying the oil level higher than normal
[单项选择]Excessive lube oil consumption can result from worn or broken（）
A. piston rings
B. valve guides
C. valve seals
D. all of the above
[单项选择]Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause （）.
A. carbon deposits on the compressor suction valves
B. the evaporator temperature to increase
C. rapid corrosion of the thermal expansion valve
D. no operating problems
[单项选择]In addition to lubricating, cylinder oil assists in forming a gas seal and contains （） which clean the cylinder liner.
A. additives
B. water
C. grease
D. acid solution
[单项选择]（） providing lubricating films, oil used in marine diesel engines have to remove heat from oil cooled piston.
A. Except for
B. Beside
C. Except
D. In addition to
[单项选择]There is a （） system lubricating the running gear and cooling the piston and sometimes lubricating the cylinders.
A. recirculating
B. total loss
C. cooling
D. refrigeration
[单项选择]Excessive oil foaming in the crankcase of a refrigeration compressor can result in （）.
A. overheated compressor bearings
B. excess lube oil viscosity
C. carbon deposits on the compressor piston rings
D. wax crystals forming in the lubricant
[单项选择]Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）
A. Splash
B. Gravity
C. Pressure
D. Bypass
[单项选择]One characteristic of a lubricating oil adversely affecting the result of centrifuging is （）
A. high TBN value
B. low oil floc point
C. low oil demulsibility
D. low oil neutralization number
[单项选择]For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an （）.
A. oil spray
B. oil bath
C. oil control rings
D. drilled passage through the camshaft
[单项选择]Lubricating oil viscosity in an operating diesel engine can be reduced by（）
A. increasing cooling water flow
B. increasing lube oil flow
C. dilution by fuel oil
D. adding SAE 70 oil
[单项选择]Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an （）.
A. overspeed trip
B. audible/visual alarm
C. the ships/boats general alarm
D. reserve oil storage tank
[单项选择]Lubricating oil systems are fitted with a wide variety of strainers some of which can be cleaned in site while others have replaceable cartridgesThe bold and italic word “which” means （）.
A. lubricating oil
B. lubricating oil systems
C. strainers
D. cartridges
[单项选择]The rate of cylinder lubricating oil metered to each cylinder of a large low-speed main propulsion diesel engine is （）
A. the same, whether at sea, or during maneuvering
B. adjusted during each hour of operation while at constant RPM
C. higher at sea than while maneuvering
D. lower at sea than while maneuvering
[单项选择]Which lubricating oil additive is used in diesel engines to reduce the tendency for sludge and varnish to form on the engine parts?（）
A. Flash point improvers
B. Pour point improvers
C. Inhibitors
D. Foam suppressors
[单项选择]The function of lubricating oil is to （）
A. maintain even distribution of bearing wear
B. maintain a constant oil temperature
C. maintain a pressurized film between moving surfaces
D. remove entrained water
[单项选择]Lubricating oil should be changed on a heavy duty diesel engine when（）.
A. it gets dark in color
B. a sample rubbed between fingers feels thin
C. it has been in use for a specified interval
D. it no longer supports combustion
