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輪機(jī)英語船舶輔助機(jī)械單項(xiàng)選擇題每日一練(2019.01.06)

單項(xiàng)選擇題
Refrigerant is circulated through a refrigeration system by the （）.
A.compressor
B.condenser
C.expansion valve
D.evaporator
單項(xiàng)選擇題
It should be ensured that only （） vapor is handled by the refrigeration compressor.
A.humidity
B.dry
C.steam
D.oil
單項(xiàng)選擇題
（）, iea steam cooler, may be filled in the boiler system to control the superheated steam temperature.
A.An economizer
B.An attemperator
C.A water dram
D.A down-comer tube
單項(xiàng)選擇題
If a bilge pump is able to develop vacuum, but is unable to sufficiently pump out the bilges, you would check for all of the following EXCEPT （）.
A.the circuit breaker
B.for leaks in the suction piping
C.relief valve is not properly seated
D.the suction strainer
單項(xiàng)選擇題
The water level showing in a boiler water gauge glass is usually （） during working.
A.higher than the actual drum water level
B.equal to the actual drum water level
C.increasing due to steam condensation in the glass
D.lower than actual drum water level