单项选择题

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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单项选择题

Safety valves on a boiler vent to the （）.

A.fuel tank
B.bilge
C.atmosphere
D.auxiliary exhaust line

单项选择题

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

单项选择题

If in doubt as to the true water level when a boiler is being oil-fired, you should （）.

A.take no measures
B.extinguish the fire as soon as possible
C.feed water to the boiler
D.open the blow down valve