10-23. During operation of the plant, a 10-29. The relief valve in the feedwater inlet pressure reduction occurs in each stage is  set  to  open  at  what  pressure? to  enable  the  plant  to 1. 71 psig 1. function with a steady, even flow of 2. 73  psig feedwater  throughout  the  plant 3. 75  psig 2. produce as much vapor in the fifth 4. 77  psig stage  as  in  the  first 3. control the feedwater temperature Questions  10-30  through  10-34  concern within the specified limits the  maintenance  of  a  flash-type  unit, 4. produce an increased amount of vapor and  should  be  judged  True  or  False. in  each  successive  stage 10-30. Air leakage in the brine and distillate 10-24. Distillate leaving the cooler is pumped pumps  will  have  NO  effect  on  vacuum. to storage tanks only if the salinity reading  is  NO  greater  than 10-31. The saltwater heater requires more frequent  cleaning  than  the  distillate 1. 0.045  epm cooler. 2. 0.055  epm 3. 0.065  epm 10-32. The orifices in the feed boxes are more 4. 0.075  epm likely  to  be  plugged  by  foreign  matter than by scale. 10-25. The four thermometers mounted on the saltwater  heater  measure  which  of  the 10-33. A relief valve that is continually following   temperatures? popping should be scheduled for routine maintenance  as  time  permits. 1. Feedwater  inlet  and  outlet 2. Steam  surrounding  the  tubes 10-34. Pneumatic-type reducing valves should be 3. Desuperheating    temperature used  only  for  low-pressure  applications. 4. All of the above 10-26. Cooling water from the air ejector precooler flows into which of the five heat exchangers mounted on the evaporator? 1. Second 2. Third 3. Fourth 4. Fifth 10-27. 10-28. How many   inches  of  mercury  are in stage   5  of  the  evaporator? 1. 24 in. 2. 26 in. 3. 28 in. 4. 30 in. What is the strainer? required purpose    of the   duplex 1. To  clean  steam  going  to  the preheater air ejector 2. To remove solid matter from seawater 3. To remove impurities from freshwater 4. To remove noncondensables from the saltwater  heater Learning   Objective: Specify maintenance   and   adjustments required  on  relief  and  reducing valves,    and  recognize  some  of  the troubles  that  may  be  encountered with  each. 10-35. Which of the following procedures must always be followed after a relief valve is  removed? 1. Reset  the  spring  tension 2. Reduce  the  pressure 3. Grind  the  disk 4. Grind  the  seat 10-36. A pneumatic pressure-controlled reducing valve may be used on which of the following  supply  lines? 1. Galley steam 2. Fuel oil 3. Freshwater 4. Each of the above 63