在原材料的品种、质量和数量的需求量方案中，按照项日产品方案提出的各种产品的品种、规格

The water level showing in a boiler water gauge glass is usually () duringworking.

A.higher than the actual drum water level

B.equal to the actual drum water level

C.increasing due to steam condensation in the glass

D.lower than actual drum wafer level

is shut down.

A.lower than

B.higher than

C.as much as

D.the same as

When steam is being raised on a boiler, the water level will normally _____.

A.drop as the boiler warms up

B.rise as the boiler warms up

C.remain unchanged until the boiler is hot enough

D.rise and fall with the steam demand

The water level in a steaming auxiliary boiler will always _____.

A.rise when the steam pressure is increased

B.remain constant as long as the feed pump operates

C.fall when the steam pressure is decreased

D.vary as the steam demand changes

A.take no measures

B.extinguish the fire as soon as possible

C.feed water to the boiler

D.open the blow down valve

A feed pump for an auxiliary boiler might lose suction if the _____.

A.boiler water level is low

B.feedwater is too hot

C.boiler steam demand is low

D.feedwater is too cold

Black smoke coming from a boiler can be caused by _____.

A.low water level

B.high water level

C.excessively high fuel pressure

D.low oil temperature

Prior to lighting off a cold automatically fired auxiliary boiler, you should _____.

A.check and regulate the water level

B.close the air cock once fires are lit

C.blowdown the gage glass

D.crack the steam stop to assure protective steam flow

between these have contributed to failures because of overheating through shortage of water, when a boiler was being oil-fired.

A.descriptions

B.discrepancies

C.different

D.deflections

A.check and regulate the water level

B.close the air cock once fires are lit

C.blowdown the gage glass

D.crack the steam stop to assure protective steam flow