單項(xiàng)選擇題On a multistage flash-type evaporator, the flash chamber is ()

A.combined as part of the salt water feed heater
B.the open area above the brine levels in the first and second stages
C.combined as part of the distillate cooler
D.another term used to describe the vapor feed heater


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2.單項(xiàng)選擇題The second stage feed-water temperature and shell absolute pressure in a multistage, flash type, distilling plant is ()

A.higher than the first stage feed-water temperature and absolute shell pressure
B.lower than the first stage feed-water temperature and absolute shell pressure
C.the same as the first stage feed-water temperature and absolute shell pressure
D.not related to the feed-water temperature and absolute shell pressure

3.單項(xiàng)選擇題The efficiency of a flash type evaporator can be increased by()

A.lowering brine discharge density
B.decreasing the absolute pressure of each stage
C.increasing the saltwater feed heater temperature
D.increasing the pressure at the spray pipe

5.單項(xiàng)選擇題Valve lash, or clearance refers to the ()

A.clearance between the top of the valve stem and the rocker arm
B.compression of the valve springs
C.clearance between the valve seat inserts and the head
D.out of roundness of the fuel injection cams