更多"To assist separation of low viscosi"的相关试题:
[单项选择]（） fuel oils （） lubricating oils require treatment before passing to the engine.
A. Both；and
B. Neither；nor
C. Either；or
D. Both；or
[单项选择]The steam boiler is part of a closed loop steam, whereby, after the energy of the steam is used up and it becomes water again, （） is collected and returned back to the boiler for heating up again to steam.
A. the former
B. the first
C. the latter
D. the last
[单项选择]The ability of lubricating oils to resist viscosity changes during temperature changes is indicated by the（）
A. American Petroleum
B. Institute number viscosity index number
C. Seconds Saybolt Furol number
D. Seconds Saybolt Universal number
[单项选择]Emulsion oils and sodium nitrite are both approved additives, but the latter cannot be used if any pipes are （） or if any soldered joints exit.
A. chromed
B. welded
C. galvanized
D. bolted
[单项选择]In large marine diesel engines cylinder oils usually contain additives formulated to impart the （） to clean the rings and grooves.
A. inefficiency
B. oiliness
C. detergency
D. purity
[单项选择]Heavy fuel oils when spilled are（）.
A. more harmful to sea life than lighter oils
B. easier to clean up than lighter refined oils
C. less harmful to sea life than lighter oils
D. not a real threat to marine life
[单项选择]Heavy fuel oils generally have an upper average ash content of 0~1% by weight.Which of the following conditions could be expected if the ash content increase above this amount?（）
A. Glazing of the cylinder liners
B. Increase valve wear
C. Excessive oil pumping
D. Increase fuel consumption
[单项选择]The development of oils （） the increasing demands made by the steady rise in powers produced by modem diesels.
A. has kept pace with
B. has kept pace to
C. has made pace with
D. has made pace to
[单项选择]The pour point of lubricating oils is affected the most by which of the following?（）
A. Extensive centrifuging
B. Wax content
C. Water content
D. Acid content
[单项选择]Heavy residual fuel oils are heated prior to centrifuging to （）
A. reduce fuel weight
B. increase specific gravity
C. separate fuel from lube oil
D. reduce fuel viscosity
[单项选择]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
[单项选择]Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to （）
A. maintain low pH in the cooling water
B. reduce the cooling water temperature
C. increase cooling water hardness
D. form a protective film on metal surfaces
[单项选择]The treatment of the fuel oils involves storage, heating, filtering and（）
A. centrifuging
B. pressurizing
C. atomization
D. igniting
[单项选择]Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
A. double bottom fuel oil tank temperature
B. heater supply steam flow
C. pressure of the fuel supplied to the burners
D. attemperator steam flow in the heater discharge circuit
[单项选择]James Watt（）the steam engine.
A. was inventing
B. invented
C. had invented
D. has invented
