更多"A decrease in the flash point of di"的相关试题:
[单项选择]A sudden decrease in the diesel engine lube oil viscosity could be an indication of（）
A. loss of additives from the lube oil
B. carbon deposits in the lube oil
C. excessive centrifuging
D. excessive fuel dilution
[单项选择]The construction of the main propulsion engine lube oil sump should （）
A. have no plating joints of 90
B. retain the lube oil as long as possible before it recirculates through the system
C. provided drain/return lines that are no greater than 24 inches from the pump suction
D. be provided with only a perfectly horizontal bottom
[单项选择]The flash point of a liquid refers to the temperature （）
A. at which a liquid will give off inflammable vapors
B. at which a liquid will burn steadily
C. at which a liquid will explode
D. that a liquid must reach before it will flow readily
[单项选择]The flash point of a petroleum product is an indication of its（）
A. viscosity
B. pour point
C. volatility
D. lower explosive limit
[单项选择]The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated （）
A. for atomizing
B. for centrifuging
C. in a storage tank
D. in the re-circulating line
[单项选择]A petroleum liquid has a flash point of 135°Fahrenheit. This liquid is classed as a grade （）.
A. B flammable liquid
B. C flammable liquid
C. D combustible liquid
D. E combustible liquid
[单项选择]A petroleum liquid has a flash point of 85°F. This is a grade （）.
A. B flammable liquid
B. C flammable liquid
C. D combustible liquid
D. E combustible liquid
[单项选择]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
[单项选择]Which harmful consequence may be the result of lube oil sludge accumulation? （）
A. Clogged oil pump suction screens
B. Increased oil operating temperatures
C. Sticking piston rings
D. All of the above
[单项选择]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
[单项选择]Which of the following will be the function of lubricating oil used in marine engines?（）
A. to remove heat from oil cooled pistons
B. to wash away wear detritus
C. to neutralize acidic products
D. all of the above
[单项选择]（）diesel engines generally have two systems of lubrication:（）a total loss system feeding and a circulating system lubricating the running gear and cooling the pistons.
A. Large crosshead type；crossheads
B. High speed；the cylinders
C. Large crosshead type；the cylinders
D. Four-stroke；pistons and cylinders
[单项选择]Oil oxidation, as a result of excessively high lube oil temperature, is harmful to a diesel engine because （）
A. oil foaming will occur
B. large quantities of oil are consumed
C. lube oil viscosity is always decreased
D. corrosive by-products are usually formed
[单项选择]Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.
A. open the bypass line
B. cut in the lube oil cooler
C. pressurize the lube oil system
D. top off the expansion tank
[单项选择]If the main engine of an unattended engine room shuts down automatically, it will be indicated by an alarm （）.
A. at each control station
B. in the chief engineer’s quarters
C. in the captains quarters
D. All of the above are correct
[单项选择]A diesel engine is similar to a gasoline engine except that the former has no （）.
A. cross-head
B. cylinder
C. connecting rod
D. spark plug
[单项选择]A diesel engine burns （） a gasoline engine of the same capacity in the same period of time.
A. as much fuel as
B. less fuel than
C. less fuel as
D. more fuel than
[单项选择]Before starting an engine by air, the engine must（）
A. be turned by a turning gear for at least one minute
B. be turned by a turning gear for at least two minutes
C. be turned at least one complete turn
D. be turned at least two complete turns
