轮机英语船舶辅助机械章节练习(2018.01.05)

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1 Water level controllers of the boiler must be kept operable to protect external steam-using plant from water “（）” danger.

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2

Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed?（）
(1) gear
(2) centrifugal
(3) screw

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3 The energy associated with molecules is known as （）.

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4 If one hydraulic pump of an electro-hydraulic steering unit falls, the vessels steering can be initially and best maintained by using the （）.

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5 The primary reason low pressure evaporators produce distillate more efficiently, and with less scale formation, than high pressure evaporators is （）.

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6 Which pump installation would require an external source of sealing water?（）

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7 Which of the following best describes “overcharge of refrigerant”?（）

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8 In the refrigeration system, a shortage of refrigerant is indicated by （）.

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9 The gear and screw pumps are classified as （）.

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10 Which of the listed operating conditions would have the greatest effect on the volumetric efficiency of an operating reciprocating air compressor?（）

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