Chemical Reaction Quiz
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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 other type 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.
Turbidityoxide
- 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 impuritiesm
- D.
Dissolved solids
- 11.The process of chemically separating one substance out in solid form from a solution describes 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 to remove 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 from water?
- A.
Hot lime soda
- B.
Cold lime sodap
- C.
Sodium zeolitep
- 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 theinitial free oxygen can be removed by heating the boiler feedwater to the saturation 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 zeolite softener?
- 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 corrosion control program?
- A.
Corrosion test coupon
- B.
Corrosion cell
- C.
Electrolytes
- D.
COC
- 20.What item is particularly useful in monitoring the effectiveness of a chemical corrosion control program?
- 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, or suspended 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
- B.
PH reaches 9
- 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
- 26.Which type of cleaning has replaced mechanical cleaning of process equipment?
- A.
Abrasive blasting
- B.
Wire brushing
- C.
Chemical
- D.
Scraping
- 27.The best and cheapest pH control program for cooling towers is
- A.
To add lignosulfonate
- B.
The addition of sulfuric acid
- C.
Frequent hard bottom blowdowns
- D.
The constant skimming of the reservoir:
- 28.When a steam boiler is being treated, what is the principal variable that causes changes in the chemical dosages?
- A.
Changing operating conditions
- B.
The percent of condensate being returned
- C.
The amount of makeup water added
- D.
Seasonal changes in chemical contentrned
- 29.Use amines in a steam boiler to
- A.
Precipitate magnesium salts
- B.
Condition sludge in the boiler
- C.
Neutralize sulfuric acid in the condensate lines
- D.
Neutralize carbonic acid in the condensate lines
- 30.When adding sodium nitrite is being added to a hot or chilled water system for corrosion control, the desired pH for proper filming is
- A.
6.5–7.5
- B.
7.5–8.5
- C.
8.5–9.5
- D.
9.5–10.5
- 31.The chemical feeding pump best suited for service when you wish to pump very strong corrosive chemicals is the
- A.
Gear
- B.
Piston
- C.
Diaphragm
- D.
Reciprocating
- 32.An antisiphon valve is used on a chemical feed system when the chemical feed tank is
- A.
Above the treated equipment
- B.
Below the treated equipment
- C.
Level the treated equipment
- D.
Beside the treated equipment
- 33.Which chemical feed system should you use when you wish to maintain a chemical level with very little fluctuation?
- A.
Intermittent
- B.
Continuousnt
- C.
Shock
- D.
Slug
- 34.In which methods of chemical feeding do you add a high level of chemicals on an infrequent basis to provide the necessary “kill” effect?
- A.
Slug
- B.
Shock
- C.
Continuous
- D.
Intermittent
- 35.When troubleshooting a diaphragm chemical pump, you notice air in the discharge hose and suspect the valve seal rings are loose. What action should you take?
- A.
Replace the pump, the seals cannot be repaired.
- B.
Replace the pump body, using the old valve and seals.
- C.
Tighten the fittings by hand until very snug, replace the seal rings if it still leaks.
- D.
Tighten the fittings to 24 foot pounds of torque, replace the seal rings if it still leaks.
- 36.What problem could result from your chemical pump’s feeding into the suction side of a system recirculating pump?
- A.
Excessive back-pressure causing high feed rates.
- B.
Low back-pressure causing low feed rates. rates.
- C.
A siphoning effect causing excessive output.tes.
- D.
A siphoning effect causing low pump output..tes.
- 37.What is the result if the length of the stroke is increased on a piston type chemical pump?
- A.
Frequency of the stroke increases.
- B.
Frequency of the stroke decreases.
- C.
Amount of chemical pumped decreases.
- D.
Amount of chemical pumped increases.
- 38.When using a bypass feeder and special chemical briquettes, how do you adjust the chemical feed rate?
- A.
Adjusting the regulating valve.
- B.
Adjusting the length of the stroke on the pump.
- C.
Adjusting the frequency of the stroke on the pump.
- D.
Raising or lowering the chemical concentration level.
- 39.Which type of chemical feed control uses a special water meter to trigger its operation?
- A.
Pump setting
- B.
Bypass feeder adjustment
- C.
Time clock pump setting
- D.
Flow proportioning control
- 40.What chemical testing system would you use on a small, noncritical system?
- A.
Continuous
- B.
Occasional
- C.
Manual
- D.
Spot
- 41.When mixing chemicals in a mixing tank, you should not try to attain chemical concentrations greater than
- A.
3 percent
- B.
5 percent
- C.
7 percent
- D.
9 percent
- 42.When you dilute any acid, you should always
- A.
Pour the acid into the water
- B.
Pour the water into the acid
- C.
Add the alkaline to the acid
- D.
Add the acid to the alkaline
- 43.What reaction, if any, should you be aware of when mixing water and caustic soda?
- A.
None, if the mixture is accomplished quickly.
- B.
Enough heat generated to boil the mixture.
- C.
A mild reaction that could freeze the mixture.
- D.
A violent reaction that will solidify the mixture.
- 44.In the event of any chemical contact with the skin, you should immediately
- A.
Rub the area vigorously with clean rags.
- B.
Cover the area and apply heat.
- C.
Flush the area with water.
- D.
Apply ice to the area.
- 45.What effect would dumping untreated water containing organic or nitrogen compounds have on surface waters?
- A.
Increase the CO level in the water.
- B.
Decrease the CO level in the water.
- C.
Increase the O2 level in the water.
- D.
Decrease the O2 level in the water.
- 46.All corrosion occurs when electric current flows from the
- A.
Anode
- B.
Cathode
- C.
Electrolyte
- D.
Conductorte
- 47.Which type of corrosion can be described by saying that the anodic and cathodic areas can switch back and forth?
- A.
Electrolytic
- B.
Galvanic
- C.
Uniform
- D.
Pitting
- 48.Which method of cathodic protection uses a rectifier?
- A.
Sacrificial anode system
- B.
Sacrificial current systemu
- C.
Impressed current system
- D.
Impressed anode systemem
- 49.What effect does too much bleedoff water have on cooling tower systems?
- A.
Higher water and utility expenses.
- B.
Reduction of system efficiency and utility expenses.
- C.
Lower water expenses and reduction of system efficiency.
- D.
Increase of system efficiency and higher water expenses.
- 50.What part of an HVAC/R system can be damaged by automotive types of antifreeze?
- A.
Pump seals.
- B.
Mixing valves.
- C.
Chilled water coil.
- D.
Distribution piping..
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