单项选择题

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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单项选择题

The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated （）

A.for atomizing
B.for centrifuging
C.in a storage tank
D.in the re-circulating line

单项选择题

The temperature of the fuel oil received during bunkering operation is critical in determining the （）

A.expansion space to leave in a tank
B.flash point at which the fuel will burn
C.temperature to which the fuel must be heated
D.rate at which the fuel can be pumped during transfer operations

单项选择题

Which of the following fuel oil characteristics establishes the danger point when transferring, pumping, and firing procedures are concerned?（）

A.Fire point
B.Flash point
C.Specific gravity
D.viscosity