单项选择题The heated feed-water entering any flash chamber of a flash-type evaporator will()

A.vaporize, with the un-flashed water remaining at the temperature at which it entered the flash chamber
B.vaporize, with the un-flashed eater equalizing to the saturation conditions existing in the f lash chamber
C.vaporize, with the remaining water a t a temperature greater than it entered the flash chamber
D.boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber


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1.单项选择题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

3.单项选择题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

4.单项选择题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

6.单项选择题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

7.单项选择题Auxiliary diesel engines can be automatically shut down as a result of ()

A.low lube oil temperature
B.low lube oil pressure
C.high exhaust temperature
D.high cooling water pressure

8.单项选择题Which of the listed conditions can cause a diesel engine to use too much lube oil?()

A.Dirty lube oil filter
B.Too much piston ring wear
C.High lube oil viscosity
D.Low lube oil temperature

9.单项选择题Which of the following operational conditions will occur to the diesel engine lube oil at extremely high temperature?()

A.The oil oxidizes and forms carbon deposits
B.The viscosity increases
C.Engine oil consumption decreases
D.Lubricating qualities of the oil are enhanced

10.单项选择题The oxidation by-products forming in diesel engine lube oil can cause ()

A.pitting
B.sludge
C.hard varnish
D.all of the above