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单选题
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
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更多 “单选题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-ringsB operation within the explosive rang of the fuelC excessive purifier operating pressuresD excessive oil viscosity” 相关考题
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regulate the fuel supplyB
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单选题If a diesel engine fails to start，one of the likely causes is （）A
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单选题For optimum results, centrifugal purification of heavy fuel oil should be accomplished with the fuel at the lowest practicable（）A
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单选题The oil index of main engine should be controlled to prevent it from in heavy weather（）A
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over speedC
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单选题If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.A
compression pressures are below normalB
lube oil is diluted with fuel oilC
cranking speed is too lowD
exhaust system is partially restricted
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type of fuel transfer pump aboardB
temperature of the fuel oil being receivedC
size of the fuel storage tanks ashoreD
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After every tripB
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单选题Clogged diesel engine fuel oil filters can cause（）A
loss of powerB
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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
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单选题Fuel oil transfer systems used onboard diesel propelled vessels are required to have （）.A
two fuel oil transfer pumps provided where one is to be independent of the main engineB
two fuel oil transfer pumps, with a combined capacity exceeding the maximum consumption of the main engineC
engine driven transfer pumps and only used in constant speed applicationsD
the capacity of the engine driven pump exceed the consumption rate of the engine to which it is attached
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单选题A diesel engine is operating with excessively high exhaust temperatures at all cylindersTo correct this condition, you should FIRST （）.A
reduce the engine loadB
increase the cooling water flowC
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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
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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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