轮机英语船舶辅助机械章节练习(2018.01.07)

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1 Which of the following statements describes the functions of a reservoir used in a hydraulic system?（）

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2 Under normal conditions, the refrigerant enters the compressor in an operating refrigeration system as a （）.

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3 If a centrifugal pump were continually operated with the discharge valve closed, the （）.

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4 An AC synchronous transmission type remote steering control system consists of a （）.

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5 A cracked diaphragm in a thermostatic expansion valve will cause the valve to （）.

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6 For many years marine centrifuges were designed for （） operation, that is the machines were run for a period during which solids accumulated in the bowlThe machine was stopped when the accumulated solids began to impair its performance.

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7 The pump discharge pressure will be considerably higher than the pressure at the （）.

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8 Gear pumps are of positive displacement type pumps because they discharge a near constant amount of liquid （） pressure.

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9 The latent heat of evaporation is dissipated in the （） in a compression refrigeration system.

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10 If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.

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