輪機(jī)英語(yǔ)船舶輔助機(jī)械章節(jié)練習(xí)(2017.12.11)

來(lái)源：考試資料網(wǎng)

1 Insufficient refrigerant in a refrigeration plant may result in （）.

2 According to the international regulations concerning the prevention of pollution of sea areas from ships, the disposal into the sea of all plastics is （）.

點(diǎn)擊查看答案&解析

3 Which of the processes listed consumes the greatest amount of power while producing the greatest amount of heat?（）

點(diǎn)擊查看答案&解析

4 Which of the following items is necessary for all waste heat boiler installations, regardless of design or manufacturer? （）

點(diǎn)擊查看答案&解析

5 The principal purpose of sub-cooling liquid refrigerant prior to its entering the expansion valve is to （）.

點(diǎn)擊查看答案&解析

6 The advantage of a centrifugal pump as compared with a reciprocating pump is that （）.

點(diǎn)擊查看答案&解析

7 Anchor（） are used in some installations where the cable lifter rotates about a vertical axis.

點(diǎn)擊查看答案&解析

8 Throttling in the （） line of a centrifugal pump involves the risk of the pump cavitation.

點(diǎn)擊查看答案&解析

9 Shaft sealing in a centrifugal pump can be effected by （）.

點(diǎn)擊查看答案&解析

10 A refrigerant boils and vaporizes in the （） in a compression refrigeration system.

點(diǎn)擊查看答案&解析