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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
参考答案
更多 “ Heavy fuel oils when spilled are ______.A.more harmful to sea life than lighter oilsB.easier to clean up than lighter refined oilsC.less harmful to sea life than lighter oilsD.not a real threat to marine life ” 相关考题
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When the ships is going to enter into the harborA.change from heavy fuel oil to diesel oil for main engineB.pumping out bilge waterC.change sea chest form high level one to lower level oneD.test emergency generator
考题
单选题When the ship is going to enter into the harbor,（）A
change from heavy fuel oil to diesel oil for mail engineB
pumping oil bilge waterC
change sea chest form high level one to lower oneD
test emergency generator
考题
单选题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 linersB
Increase valve wearC
Excessive oil pumpingD
Increase fuel consumption
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单选题When the opening pressure of a diesel fuel injector is greater than that specified by the engine manufacturer，the （）A
quantity of fuel injected is decreasedB
quantity of fuel injected will always be increasedC
start of injection is advancedD
duration of injection will always be greater
考题
单选题Heavy residual fuel oils are heated prior to centrifuging to （）A
reduce fuel weightB
increase specific gravityC
separate fuel from lube oilD
reduce fuel viscosity
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单选题The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.A
be jammedB
be openedC
be seatedD
be broken
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单选题A small fuel spillage has occurred during helicopter refueling. After the leak has been stopped and fire-control personnel have been notified and are standing by，the next step is to（）.A
proceed with fueling operationB
have helicopter move to a safer locationC
wash spilled fuel away with a flood of waterD
clean spilled fuel with rags
考题
单选题When centrifuging heavy fuel oil, an important factor to consider is the （） (1) flow rate (2) viscosity of the fuel oilA
(1) only is correctB
(2) only is correctC
both (1) and (2) are correctD
neither (1) or (2) are correct
考题
单选题When running before a heavy sea，moving weights aft will affect the handling of a vessel by （）.A
reducing rollingB
increasing rollingC
reducing yawingD
increasing yawing
考题
单选题What generally occurs when the land is cooler than the nearby water? （）A
A land breezeB
A sea breezeC
A northerD
A prevailing westerly
考题
单选题The treatment of the fuel oils involves storage, heating, filtering and（）A
centrifugingB
pressurizingC
atomizationD
igniting
考题
单选题When the opening pressure of a diesel engine fuel injector is greater than that specified by the engine manufacturer, which of the following problems can be expected?（）A
Quantity of fuel injected tends to be decreasedB
Quantity of fuel injected will always be increasedC
Start of injection tends to be advancedD
Duration of injection will always greater
考题
单选题When preparing a ship for heavy weather，fuel oil day tanks should be（）.A
pumped overboard to calm the seasB
drained to the lower hull to reduce free surfacesC
filled to ensure that sufficient fuel oil is available during a lengthy emergencyD
partially drained to increase free surfaces in order to reduce motions
考题
单选题Heavy fuel oils when spilled are（）.A
more harmful to sea life than lighter oilsB
easier to clean up than lighter refined oilsC
less harmful to sea life than lighter oilsD
not a real threat to marine life
考题
单选题What color exhaust will be exhibited when a slow speed two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?（）A
WhiteB
BlackC
BlueD
Clear
考题
单选题When ship navigating in rough sea, the first measure taken by the chief engineer to prevent the overload should be（）A
cleaning fuel oil, lubricating oil and seawater filterB
reducing fuel feeding of the main engine appropriately or reducing the pitch angle of propellerC
using low sea chestD
closing the skylight and the ventilation opening, which doesn’t affect the normal work of equipments
考题
单选题The use of sinking and dispersing agents for the removal of surface oil is （）.A
the most common method used in the United StatesB
too expensive for common useC
generally safe to sea lifeD
generally harmful to sea life
考题
单选题What is the harmful effect of sulfur in a fuel?（）A
It causes excessive smoking and soot at low firing ratesB
It doesn’t readily burn when combined with oxygenC
It clogs fuel oil strainers more oftenD
It forms a corrosive acid when mixed with water or water vapor
考题
单选题"Cast iron has poor corrosion resistance to sea water, especially in the presence of bronzes" Implies（）.A
east iron is a cheap materialB
cast iron can pollute sea waterC
cast iron has mere corrosive than bronzes to sea waterD
cast iron is more corrosive to sea water when it meets with bronzes
考题
单选题When comparing different fuels for different engines, the ignition quality of diesel fuel oils becomes a less critical consideration as （）A
the amount of lube oil additives increaseB
piston speeds increaseC
injection pressure decreaseD
engine speeds decrease
考题
单选题When restarting a heavy fuel diesel engine that has been stopped for some time, the engine should（）A
increase the starting air pressureB
use a higher than normal cranking speedC
increase the fuel injection pressureD
use a fuel having a lower ignition temperature
考题
单选题（）is not a process of weathering of the oil spilled in the sea water.A
EvaporationB
DispersionC
EmulsificationD
Drifting
考题
单选题When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）A
The diesel oil must never be allowed to mix with the heavy fuelB
The temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valveC
The heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valveD
The heating steam must be secured before the diesel oil passes through the three-way valve
考题
单选题（） fuel oils （） lubricating oils require treatment before passing to the engine.A
Both；andB
Neither；norC
Either；orD
Both；or
考题
单选题When ship navigating in rough sea, the correct operation is （）A
navigating with a low diesel engine speedB
navigating with a stable diesel engine speedC
increasing the efficiency of propellerD
increasing fuel injection
考题
单选题When used to fight fire，carbon dioxide（）.A
is effective if used promptly on an oil fireB
has a greater cooling effect than waterC
is lighter than airD
is harmless to cargo and crew
考题
单选题When the ships is going to enter into the harbor,（）.A
change from diesel oil to heavy fuel oil for mail engineB
pump out bilge waterC
change sea chest form lower level one to high level oneD
test emergency generator
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