1.
Which reverse osmosis water purification units are specifically designed for the US Air Force?
A. 
B. 
C. 
D. 
2.
Which color band designates reverse osmosis water purification unit piping that carries filtered water?
A. 
B. 
C. 
D. 
3.
Which color band designates reverse osmosis water purification unit piping that carries product water?
A. 
B. 
C. 
D. 
4.
How many gallons per hour does the H–9518–2 reverse osmosis water purification unit produce (on average)?
A. 
B. 
C. 
D. 
5.
What is the capacity of the reverse osmosis water purification unit raw water pump?
A. 
B. 
C. 
D. 
6.
The movement of water through a permeable membrane from an area of lesser concentration to an area of higher concentration is called:
A. 
B. 
C. 
D. 
7.
What percent of organic materials in water is removed by the reverse osmosis water purification unit?
A. 
B. 
C. 
D. 
8.
Unless otherwise directed by medical authorities, how many parts per million of chlorine residual must you keep in the product water produced by the reverse osmosis water purification unit?
A. 
B. 
C. 
D. 
9.
Which chemical is used as a coagulant aid during the reverse osmosis water purification unit treatment process? Which chemical is used as a coagulant aid during the reverse osmosis water purification unit
treatment process?Which chemical is used as a coagulant aid during the reverse osmosis water purification unit
treatment process?
A. 
B. 
C. 
D. 
10.
Sodium hex is fed by the reverse osmosis water purification unit chemical feed pump at the:
A. 
B. 
Multimedia filter influent.
C. 
Reverse osmosis element pump.
D. 
Reverse osmosis element influent.
11.
What type of valve is used to backwash the multimedia filter on the reverse osmosis water purification unit?
A. 
B. 
C. 
D. 
12.
The multimedia filter pressure gauge on the reverse osmosis water purification unit indicates:
A. 
B. 
C. 
D. 
13.
What tests are taken utilizing the color comparator?
A. 
B. 
C. 
D. 
14.
In which order do the high-pressure safety devices on the WPES–20 reverse osmosis water purification unit activate?
A. 
High-pressure relief valve, high-pressure switch, rupture disc assembly.
B. 
High-pressure switch, high-pressure relief valve, rupture disc assembly.
C. 
High-pressure relief valve, rupture-disc assembly, high-pressure switch.
D. 
Low-pressure switch, high-pressure switch, rupture disc assembly, high-pressure relief valve.
15.
Technically speaking, what physical impact does the choice of a clear water source have on the reverse osmosis water purification unit (ROWPU)?
A. 
Lower working pressure is exerted on the RO elements.
B. 
Water source will be relatively free of pollutants.
C. 
Less frequent backwashings will be realized.
D. 
Less wear and tear on the RO pump.
16.
How far away from the campsite should you set up the reverse osmosis water purification unit?
A. 
B. 
C. 
D. 
17.
Where are the two deionization cartridges packed in the H–9518–2 model reverse osmosis water purification unit?
A. 
B. 
C. 
D. 
18.
What is the maximum total dissolved solids (TDS) the factory-calibrated in-line TDS monitor can read?
A. 
B. 
C. 
D. 
19.
What initial action drives the ocean intake wellpoint into the ocean floor?
A. 
Pressure exerted down on the wellpoint.
B. 
Water pressure from the pump.
C. 
D. 
20.
Which technical order do you use when operating the H–9581–2 reverse osmosis water purification unit?
A. 
B. 
C. 
D. 
21.
During initial start-up of the reverse osmosis water purification unit (ROWPU), all chemical feed valves must be set to:
A. 
B. 
C. 
D. 
22.
What is the initial setting of all the chemical pump control knobs on the reverse osmosis water purification unit?
A. 
B. 
C. 
D. 
23.
What is the maximum reverse osmosis pump pressure that should never be exceeded when operating the reverse osmosis water purification unit?
A. 
What is the maximum reverse osmosis pump pressure that should never be exceeded when operating the reverse osmosis water purification unit?
B. 
500 psi (seawater), 980 psi (brackish water).
C. 
960 psi (seawater), 500 psi (brackish water).
D. 
500 psi (seawater), 960 psi (brackish water).
24.
What component of the reverse osmosis water purification unit controls the backwash procedure?
A. 
B. 
C. 
D. 
25.
What is the purpose of feeding citric acid into the reverse osmosis water purification unit (ROWPU) during the production run?
A. 
Increase the pH of raw water.
B. 
Increase the pH of product water.
C. 
Reduce scale build-up on the RO elements.
D. 
Reduce scale build-up on the cartridge filter elements.