-
If the detergent type lubricating oil being used in a diesel engine is black, the oil （）
A . must be centrifuged
B . must by filtered
C . must be changed
D . is holding finely dispersed carbon in suspensio
-
The removal of （） from lubricating oil will reduce engine wear and possible breakdowns.
A . contaminating water
B . contaminated additives
C . contaminated fuel
D . contaminating impuritie
-
The lubricating system for the cylinder walls is different from the bearings in that the oil for former one is supplied in （） while that for latter one is （）.
A . sufficient quantity； measured
B . measured quantity；sufficient
C . excessive quantity；sufficient
D . the less quantity the better；the more the better
-
Although lube oils used in the main lubricating service systems should have a relatively high flash point to avoid ignition, they can create smoke and fire hazards when they （）.
A . are exposed to a vacuum
B . come in contact with extremely hot surfaces
C . are reduced in temperature to just above the pour point
D . become extremely agitated or aerated
-
Engine coolant accumulating in the diesel engine lubricating oil can result from a （）
A . low oil pressure
B . high coolant pressure
C . leaking fuel injector
D . cracked cylinder head or liner
-
The （）pump is usually used as the lubricating oil pump.
A . turbine
B . screw
C . vaneejector
D . centrifugal
-
Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine （）
A . camshaft beatings
B . main bearings
C . piston crowns
D . cylinder wall
-
The amount of lubricating oil in the drain tank should be checked by （）.
A . measuring
B . sounding rod
C . metering
D . weighting
-
An important consideration in selecting a lubricating oil for use in a refrigeration compressor is for the oil to （）
A . have a high viscosity index
B . mix readily with refrigerant
C . have a high freezing point
D . have a low pour point
-
There will usually be summaries or daily account tables for heavy oil, diesel oil, lubricating oil, and fresh water, which will be compiled（）
A . at the beginning of every watch
B . at the beginning of the first watch every day
C . at the completion of every watch
D . at noon every day
-
Two main lubricating oil pumps are usual and are obligatory in （）.
A . container ships
B . bulk carriers
C . passenger ships
D . barge
-
One of function of diesel engine lubricating oil is to （）
A . induce carbon formation on cylinder walls
B . improve fuel penetration in the combustion space
C . form a friction reducing film between mating surfaces
D . lubricate the fuel injectio
-
There should be a lubricating oil （） between the main beatings and the crankshaft.
A . film
B . cap
C . lacquer
D . shell
-
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 combustio
-
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
-
Which of the following statements is correct concerning the viscosity of lubricating oil?（）
A . Viscosity will increase as temperature increases
B . Viscosity is a measure of a fluid s internal resistance to flow
C . Viscosity will decrease as temperature decreases
D . Viscosity is not dependent on temperature
-
In engines with system, the lubricating oil can be added to the engine through the filling hole in the crankcase cover, by using a hand oil can, or through the separator pipe（）
A . lubricating oil
B . dry sump
C . circulated tank
D . wet sum
-
The temperature difference between the inlet and outlet temperature of the lube oil cooler in the lubricating system for the diesel engine is generally between （）.
A . 8-10℃
B . 10-12℃
C . 10-15℃
D . 10-20℃
-
（） 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
-
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
-
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 . Bypa
-
The following options are all the functions of lubricating oil except（）
A . removing heat and deposits
B . neutralizing acidic products
C . lubricating
D . improving combustion efficiency
-
When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.
A . filter to remove the fuel oil
B . use the settler to remove the fuel oil
C . remove the fuel oil by centrifuging
D . drain and then renew the lube oil supply
-
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
