更多"Heavy fuel oils generally have an u"的相关试题:
[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]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]（） 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 treatment of the fuel oils involves storage, heating, filtering and（）
A. centrifuging
B. pressurizing
C. atomization
D. igniting
[单项选择]Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce（）.
A. cold corrosion of the nozzles
B. fuel viscosity for better atomization
C. carbon accumulation on the nozzles
D. fuel detonation in the cylinders
[单项选择]One engine manufacturer recommends heavy fuel oil should not be heated above 80℃ to 95℃ (176 ℉ TO 203℉) before purificationThis upper limit should be observed to ensure against（）
A. flattening of the bowl neoprene O-rings
B. operation within the explosive rang of the fuel
C. excessive purifier operating pressures
D. excessive oil viscosity
[单项选择]After fuel tanks have been topped off, which of the listed procedures should be followed next?（）
A. The pressure-vacuum relief valve should be reset
B. The tanks should be made seaworthy to prevent contamination
C. The tanks should be sounded to make sure the levels are not rising
D. The tanks should be marked with a bull stamp on the manifold filling valve
[单项选择]
When centrifuging heavy fuel oil, an important factor to consider is the （）
(1) flow rate
(2) viscosity of the fuel oil
A. (1) only is correct
B. (2) only is correct
C. both (1) and (2) are correct
D. neither (1) or (2) are correct
[单项选择]When restarting a heavy fuel diesel engine that has been stopped for some time, the engine should（）
A. increase the starting air pressure
B. use a higher than normal cranking speed
C. increase the fuel injection pressure
D. use a fuel having a lower ignition temperature
[单项选择]The safe rate of bunkering heavy fuel oil is directly related to the （）.
A. type of fuel transfer pump aboard
B. temperature of the fuel oil being received
C. size of the fuel storage tanks ashore
D. distance from the fuel oil storage tanks ashore
[单项选择]Injectors for use with heavy fuel oil must be cooled by either water or light oil to （）
A. prevent heat corrosion to internal components
B. increase fuel delivery rate and economy
C. prevent pre-ignition
D. avoid carbonization of the nozzle tips
[单项选择]When the heavy fuel oil is heated to achieve the viscosity of 10-15 cst, may occur.To avoid this, a system is used in most occasions（）
A. boiling and cavitations; low temperature
B. boiling and cavitations; pressurized
C. leaking and boiling; low temperature
D. leaking and boiling; pressurized
[单项选择]When preparing a ship for heavy weather，fuel oil day tanks should be（）.
A. pumped overboard to calm the seas
B. drained to the lower hull to reduce free surfaces
C. filled to ensure that sufficient fuel oil is available during a lengthy emergency
D. partially drained to increase free surfaces in order to reduce motions
[单项选择]If fuel tank levels are found to have increased after a grounding, you should suspect （）.
A. a damaged pneumercator line
B. a puncture, crack, or hole in the skin of the vessel
C. improper record keeping of fuel transfer activities
D. contamination of the contaminated steam supply system
[填空题]Have
run
out of
fuel, the plane
crashed
to
the ground.
[单项选择]Fuel injection systems meter fuel, atomize fuel, and （）.
A. create turbulence in the combustion chamber
B. aid in completing cylinder scavenging
C. inject fuel at the proper time
D. minimize fuel penetration into the cylinder
[单项选择]Machinery driving fuel oil transfer and fuel oil service pumps must be fitted with a remote means of stopping the machinery from （）.
A. within the space concerned
B. outside the space concerned
C. the throttle station
D. within the fire room
[单项选择]During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.
A. ensure penetration and distribution of the fuel in the combustion chamber
B. ensure the needle valve is flushed clean during each injection
C. prevent combustion gas blowback into the open needle valve
D. prevent reflected pressure waves when the needle valve closes
