A firebox explosion in an automatically fired auxiliary boiler may be the result of ______.

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• 1The water in a steaming auxiliary boiler should be tested daily for ______.

  A.dissolved oxygen

  B.chlorides

  C.sludge

  D.dissolved nitrogen

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• 2______continuously extract the crankcase atmosphere, via a pipe system, and move it past a sensitive and accurate opacity (不透明)measuring track.

  A.The oil mist detectors

  B.The smoke detectors

  C.An oily water monitor

  D.Oil discharge monitoring and controlling system

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• 3The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust ______.

  A.gas composition

  B.gas temperature

  C.pressure

  D.timing

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• 4A controllable pitch propeller on a diesel driven vessel eliminates the need for ______.

  A.friction clutches

  B.disconnect clutches

  C.reversing gears

  D.reduction gears

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• 5Before a marine diesel engine is started the cylinders and pistons must be ______.

  A.cooled to appropriate temperature

  B.warmed up gradually to appropriate temperature

  C.opened up and renewed

  D.ground and polished

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• 6A feed pump for an auxiliary boiler might lose suction if the ______.

  A.boiler water level is low

  B.feed-water is too hot

  C.boiler steam demand is low

  D.feed-water is too cold

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• 7The gear and screw pumps are classified as______.

  A.variable stroke pumps

  B.multistage pumps

  C.positive displacement pumps

  D.triple-ported pumps

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• 8The pressure of a liquid leaving the pump can be referred to as the ______.

  A.total head

  B.discharge head

  C.net positive suction head

  D.suction head

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• 9Which of the valves listed will be cycled from fully open to fully closed when the handle is turned 90 degree、

  A.A rising stem gate valve

  B.A globe stop valve

  C.A check valve

  D.A butterfly valve

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• 10A pump shaft that is bent or distorted should normally be ______.

  A.repaired by a suitable welding process

  B.straightened by applying heat and torsion

  C.reconditioned by metallizing and machining

  D.replaced with a satisfactory spare

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