3e151 CDC Set C/P Volume 3

50 Questions | By Patricklittle101 | Updated: Mar 20, 2022 | Attempts: 381

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1.

Which water source is generally clear, cool, low in organic material, and frequently hard?
- A.
  
  Lake.
- B.
  
  Pond.
- C.
  
  Spring.
- D.
  
  Stream.
2.

A lake surface water source, with considerable self-purification, is similar to which othertype of surface water source?
- A.
  
  Pond
- B.
  
  Spring
- C.
  
  Ground
- D.
  
  Stream
3.

Suspended matter of any nature present in water is
- A.
  
  Hardness
- B.
  
  Turbidity
- C.
  
  Organic matter
- D.
  
  Dissolved solids
4.

Which impurity is used to determine the cycles of concentration (COC)?
- A.
  
  Free mineral acids
- B.
  
  Carbon dioxide
- C.
  
  Turbidity
- D.
  
  Chloride
5.

The presence of hydrogen ions causes a solution to be
- A.
  
  Turbid
- B.
  
  Acidic
- C.
  
  Neutral
- D.
  
  Alkaline
6.

A pH of 5 in a water system, such as a boiler, aids in the development of
- A.
  
  Foam
- B.
  
  Scale
- C.
  
  Corrosion
- D.
  
  Hydroxides
7.

Which items has no bearing on the formation of scale?
- A.
  
  Iron
- B.
  
  Hardness
- C.
  
  Alkalinity
- D.
  
  Temperature
8.

Which of the types of alkalinity will not cause scale?
- A.
  
  Ionic alkalinity
- B.
  
  Carbonate alkalinity
- C.
  
  Hydroxide alkalinity
- D.
  
  Bicarbonate alkalinity
9.

Corrosion caused by acid produced by carbon dioxide usually shows up as
- A.
  
  Pitting along the bottom of the piping
- B.
  
  Grooves along the bottom of the piping
- C.
  
  Pitting on the entire surface of the piping
- D.
  
  Grooves on the entire surface of the piping
10.

The clarification process is used to remove
- A.
  
  All silica from feedwater.
- B.
  
  Calcium and magnesium.
- C.
  
  Suspended impurities.
- D.
  
  Dissolved solids.
11.

The process of chemically separating one substance out in solid form from a solutiondescribes what water treatment process?
- A.
  
  Filtration
- B.
  
  Clarification
- C.
  
  Sedimentation
- D.
  
  Chemical precipitation
12.

Which external water softening treatment process relies on a temperature of 212° F toremove hardness from system water?
- A.
  
  Cold lime soda
- B.
  
  Hot lime soda
- C.
  
  Sodium zeolite water
- D.
  
  Hydrogen zeolite water
13.

What external water softening treatment process uses acid to help remove hardness fromwater?
- A.
  
  Hot lime soda
- B.
  
  Cold lime soda
- C.
  
  Sodium Zeolite
- D.
  
  Hydrogen Zeolite
14.

During the external treatment of water to be used in a mechanical system, aeration is used to
- A.
  
  Increase the CO2 level
- B.
  
  Remove the CO2 level
- C.
  
  Increase the CO level
- D.
  
  Remove the CO level
15.

How much of the initial free oxygen can be removed by heating the boiler feedwater to thesaturation temperature?
- A.
  
  80 to 85 percent
- B.
  
  85 to 90 percent
- C.
  
  90 to 95 percent
- D.
  
  95 to 100 percent
16.

Which test should you use to make sure proper regeneration solution of the sodium zeolitesoftener?
- A.
  
  Total hardness
- B.
  
  Dissolved iron
- C.
  
  Diluted acid
- D.
  
  Brine
17.

In a cooling system, what is necessary for algae to grow?
- A.
  
  Water, heat, and air
- B.
  
  Air, light, and water
- C.
  
  Heat, light, and water
- D.
  
  Air, light, and minerals
18.

Crevice corrosion occurs when a solution contains varying amounts of dissolved
- A.
  
  Magnesium
- B.
  
  Oxygen
- C.
  
  Nitrogen
- D.
  
  Calcium
19.

What item is particularly useful in monitoring the effectiveness of a chemical corrosioncontrol program?
- A.
  
  Corrosion test coupon
- B.
  
  Corrosion cell
- C.
  
  Electrolytes
- D.
  
  COC
20.

The alkalinity level of the water in a steam boiler is monitored closely to prevent
- A.
  
  Acidic corrosion
- B.
  
  The formation of scale
- C.
  
  Caustic boiler seam cracks
- D.
  
  Low levels of sludge formation
21.

What type carryover is caused by high concentrations of alkalinity, dissolved solids, orsuspended solids?
- A.
  
  Mist
- B.
  
  Silica
- C.
  
  Priming
- D.
  
  Foaming
22.

When are water samples drawn from an operating boiler?
- A.
  
  As soon as possible after bottom blowdown.
- B.
  
  As soon as possible after adding chemicals.
- C.
  
  Before firing the boiler for the first time.
- D.
  
  Before chemicals are added or before regular blow down is accomplished.
23.

The solenoid valve on the blowdown line of a cooling tower is energized when the
- A.
  
  PH reaches 5.0
- B.
  
  PH reaches 9.0
- C.
  
  Water's conductivity exceeds the meter setting
- D.
  
  Water's conductivity drops below the meter setting
24.

Who on the base must approve the use of a new chemical or the disposal of waste water?
- A.
  
  Base civil engineer and shop supervisor.
- B.
  
  Base commander and base civil engineer.
- C.
  
  Bioenvironmental engineer and base commander.
- D.
  
  Environmental engineer and bioenvironmental engineer.
25.

What type solution is used to boil out a new boiler?
- A.
  
  An acidic solution
- B.
  
  An alkaline solution
- C.
  
  A strong soap solution
- D.
  
  A distilled water solution