輪機(jī)英語(yǔ)船舶輔助機(jī)械章節(jié)練習(xí)(2017.11.27)

來(lái)源：考試資料網(wǎng)

1 Which of the following statements is true concerning centrifugal pumps?（）

2 In a vapor compression refrigeration the evaporating pressure is maintained constant by the action of the （）, which removes vapor from the evaporator at the same rate at which it is formed.

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3 The percentage of impurities in a specific fuel oil sample is determined by （）.

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4 The tendency of a flammable liquid to vaporize is indicated by its （）.

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5 In （） pumps a closed discharge valve will cause bursting discharge pressure.

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6 WHR stands for （）.

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7 The amount of fluid delivered by a gear pump can be regulated by （）.

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8 Large pipes or down-comers are fitted between the steam drum and （） to ensure good natural circulation of water.

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9 （） is the circulation and refreshing of the air in a space without necessarily a change of temperature.

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10 When the steering gear is in operation, you should （）.

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