Chemical Reaction Quiz
.
- 1.
Which water source is generally clear, cool, low in organic material, and frequently hard?
- A.
Lake
- B.
Pond
- C.
Spring
- D.
Stream
Correct Answer
C. Spring -
- 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
Correct Answer
D. Stream -
- 3.
Suspended matter of any nature present in water is
- A.
Hardness
- B.
Turbidity
- C.
Organic matter
- D.
Dissolved solids
Correct Answer
B. Turbidity -
- 4.
Which impurity is used to determine the cycles of concentration (COC)?
- A.
Free mineral acids
- B.
Carbon dioxide
- C.
Turbidityoxide
- D.
Chloride
Correct Answer
D. Chloride -
- 5.
The presence of hydrogen ions causes a solution to be
- A.
Turbid.
- B.
Acidic.
- C.
Neutral.
- D.
Alkaline.
Correct Answer
B. Acidic. -
- 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
Correct Answer
C. Corrosion -
- 7.
Which items has no bearing on the formation of scale?
- A.
Iron
- B.
Hardness
- C.
Alkalinity
- D.
Temperature
Correct Answer
A. Iron -
- 8.
Which of the types of alkalinity will not cause scale?
- A.
Ionic alkalinity
- B.
Carbonate alkalinity
- C.
Hydroxide alkalinity
- D.
Bicarbonate alkalinity
Correct Answer
C. Hydroxide 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.
Correct Answer
B. Grooves along the bottom 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
Correct Answer
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.
Correct Answer
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
Correct Answer
B. Hot lime soda -
- 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
Correct Answer
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
Correct Answer
B. Remove the CO2 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
Correct Answer
C. 90 to 95 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
Correct Answer
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
Correct Answer
B. Air, light, and water -
- 18.
Crevice corrosion occurs when a solution contains varying amounts of dissolved
- A.
Magnesium.
- B.
Oxygen.
- C.
Nitrogen.
- D.
Calcium.
Correct Answer
B. Oxygen. -
- 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
Correct Answer
A. Corrosion test coupon -
- 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
Correct Answer
C. Caustic boiler seam cracks -
- 21.
What type carryover is caused by high concentrations of alkalinity, dissolved solids, or suspended solids?
- A.
Mist.
- B.
Silica.
- C.
Priming.
- D.
Foaming.
Correct Answer
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.
Correct Answer
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
Correct Answer
C. Water’s conductivity exceeds 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
Correct Answer
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
Correct Answer
B. An alkaline solution -
- 26.
Which type of cleaning has replaced mechanical cleaning of process equipment?
- A.
Abrasive blasting
- B.
Wire brushing
- C.
Chemical
- D.
Scraping
Correct Answer
C. Chemical -
- 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:
Correct Answer
B. The addition of sulfuric acid -
- 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
Correct Answer
C. The amount of makeup water added -
- 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
Correct Answer
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
Correct Answer
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
Correct Answer
C. Diaphragm -
- 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
Correct Answer
A. Above 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
Correct Answer
B. Continuousnt -
- 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
Correct Answer
B. Shock -
- 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.
Correct Answer
C. Tighten the fittings by hand until very snug, 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.
Correct Answer
C. A siphoning effect causing excessive 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.
Correct Answer
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.
Correct Answer
A. Adjusting the regulating valve. -
- 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
Correct Answer
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
Correct Answer
B. Occasional -
- 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
Correct Answer
B. 5 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
Correct Answer
A. Pour the acid into the water -
- 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.
Correct Answer
B. Enough heat generated to boil 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.
Correct Answer
C. Flush the area with water. -
- 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.
Correct Answer
C. Increase the O2 level in the water. -
- 46.
All corrosion occurs when electric current flows from the
- A.
Anode
- B.
Cathode
- C.
Electrolyte
- D.
Conductorte
Correct Answer
A. Anode -
- 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
Correct Answer
C. Uniform -
- 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
Correct Answer
C. Impressed current system -
- 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.
Correct Answer
A. Higher water and utility 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..
Correct Answer
A. Pump seals. -
Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Aug 14, 2015Quiz Edited by
ProProfs Editorial Team -
Jan 23, 2013Quiz Created by
Enorab
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