单项选择题

The safety valves should be tested and adjusted when the boiler survey is （）

A.completed
B.carried out
C.cleaned
D.steamed

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A donkey boiler is （）.

A.one to supply steam to the main propulsion turbine
B.an auxiliary boiler
C.A and B
D.neither A nor B

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Safety valves on a boiler vent to the （）.

A.fuel tank
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The boiler feed pump discharge pressure is higher than the steam drum pressure to （）.

A.ensure feed water flow into the boiler
B.keep the steam drum pressure high
C.prevent water hammer in the feed line
D.help the feed water flash to steam