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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 liners
B
Increase valve wear
C
Excessive oil pumping
D
Increase fuel consumption
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in the upper partD
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fuel dribbling from leaking fuel injectorsB
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more harmful to sea life than lighter oilsB
easier to clean up than lighter refined oilsC
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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
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单选题The ash content of a fuel oil is significant to the operating engineer because it （）A
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reflects the overall thermal efficiency of the fuel oil service system
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单选题An oil water monitor is required in order to measure （）.A
the oil content in waterB
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temperature of the fuel oil being receivedC
size of the fuel storage tanks ashoreD
distance from the fuel oil storage tanks ashore
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paintsC
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water in the fuel oilB
excessive cyclingC
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carbon accumulation on the nozzlesD
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单选题The pour point of lubricating oils is affected the most by which of the following?（）A
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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-ringsB
operation within the explosive rang of the fuelC
excessive purifier operating pressuresD
excessive oil viscosity
考题
单选题When restarting a heavy fuel diesel engine that has been stopped for some time, the engine should（）A
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increase the fuel injection pressureD
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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
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