Chemical Reaction Quiz

1. In the event of any chemical contact with the skin, you should immediately

Rub the area vigorously with clean rags.

Cover the area and apply heat.

Flush the area with water.

Apply ice to the area.

2. What type carryover is caused by high concentrations of alkalinity, dissolved solids, or suspended solids?

Mist.

Silica.

Priming.

Foaming.

3. Which type of cleaning has replaced mechanical cleaning of process equipment?

Abrasive blasting

Wire brushing

Chemical

Scraping

4. When are water samples drawn from an operating boiler?

As soon as possible after bottom blowdown.

As soon as possible after adding chemicals.

Before firing the boiler for the first time.

Before chemicals are added or before regular blow down is accomplished.

5. 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?

Replace the pump, the seals cannot be repaired.

Replace the pump body, using the old valve and seals.

Tighten the fittings by hand until very snug, replace the seal rings if it still leaks.

Tighten the fittings to 24 foot pounds of torque, replace the seal rings if it still leaks.

6. What part of an HVAC/R system can be damaged by automotive types of antifreeze?

Pump seals.

Mixing valves.

Chilled water coil.

Distribution piping..

7. Which water source is generally clear, cool, low in organic material, and frequently hard?

Lake

Pond

Spring

Stream

8. When a steam boiler is being treated, what is the principal variable that causes changes in the chemical dosages?

Changing operating conditions

The percent of condensate being returned

The amount of makeup water added

Seasonal changes in chemical contentrned

9. In which methods of chemical feeding do you add a high level of chemicals on an infrequent basis to provide the necessary "kill" effect?

Slug

Shock

Continuous

Intermittent

10. What item is particularly useful in monitoring the effectiveness of a chemical corrosion control program?

Corrosion test coupon

Corrosion cell

Electrolytes

COC

11. Which test should you use to make sure proper regeneration solution of the sodium zeolite softener?

Total hardness

Dissolved iron

Diluted acid

Brine

12. A lake surface water source, with considerable self-purification, is similar to which other type of surface water source?

Pond

Spring

Ground

Stream

13. An antisiphon valve is used on a chemical feed system when the chemical feed tank is

Above the treated equipment

Below the treated equipment

Level the treated equipment

Beside the treated equipment

14. Which chemical feed system should you use when you wish to maintain a chemical level with very little fluctuation?

Intermittent

Continuousnt

Shock

Slug

15. Which type of chemical feed control uses a special water meter to trigger its operation?

Pump setting

Bypass feeder adjustment

Time clock pump setting

Flow proportioning control

16. In a cooling system, what is necessary for algae to grow?

Water, heat, and air

Air, light, and water

Heat, light, and water

Air, light, and minerals

17. What reaction, if any, should you be aware of when mixing water and caustic soda?

None, if the mixture is accomplished quickly.

Enough heat generated to boil the mixture.

A mild reaction that could freeze the mixture.

A violent reaction that will solidify the mixture.

18. The process of chemically separating one substance out in solid form from a solution describes what water treatment process?

Filtration.

Clarification.

Sedimentation.

Chemical precipitation.

19. Who on the base must approve the use of a new chemical or the disposal of waste water?

Base civil engineer and shop supervisor

Base commander and base civil engineer

Bioenvironmental engineer and base commander

Environmental engineer and bioenvironmental engineer

20. Which external water softening treatment process relies on a temperature of 212° F to remove hardness from system water?

Cold lime soda

Hot lime soda

Sodium zeolite water

Hydrogen zeolite water

21. When mixing chemicals in a mixing tank, you should not try to attain chemical concentrations greater than

3 percent

5 percent

7 percent

9 percent

22. Which items has no bearing on the formation of scale?

Iron

Hardness

Alkalinity

Temperature

23. The chemical feeding pump best suited for service when you wish to pump very strong corrosive chemicals is the

Gear

Piston

Diaphragm

Reciprocating

24. When you dilute any acid, you should always

Pour the acid into the water

Pour the water into the acid

Add the alkaline to the acid

Add the acid to the alkaline

25. Suspended matter of any nature present in water is

Hardness

Turbidity

Organic matter

Dissolved solids

26. All corrosion occurs when electric current flows from the

Anode

Cathode

Electrolyte

Conductorte

27. What is the result if the length of the stroke is increased on a piston type chemical pump?

Frequency of the stroke increases.

Frequency of the stroke decreases.

Amount of chemical pumped decreases.

Amount of chemical pumped increases.

28. When adding sodium nitrite is being added to a hot or chilled water system for corrosion control, the desired pH for proper filming is

6.5–7.5

7.5–8.5

8.5–9.5

9.5–10.5

29. How much of theinitial free oxygen can be removed by heating the boiler feedwater to the saturation temperature?

80 to 85 percent

85 to 90 percent

90 to 95 percent

95 to 100 percent

30. Corrosion caused by acid produced by carbon dioxide usually shows up as

Pitting along the bottom of the piping.

Grooves along the bottom of the piping.

Pitting on the entire surface of the piping.

Grooves on the entire surface of the piping.

31. What effect does too much bleedoff water have on cooling tower systems?

Higher water and utility expenses.

Reduction of system efficiency and utility expenses.

Lower water expenses and reduction of system efficiency.

Increase of system efficiency and higher water expenses.

32. The best and cheapest pH control program for cooling towers is

To add lignosulfonate

The addition of sulfuric acid

Frequent hard bottom blowdowns

The constant skimming of the reservoir:

33. Which type of corrosion can be described by saying that the anodic and cathodic areas can switch back and forth?

Electrolytic

Galvanic

Uniform

Pitting

34. Which impurity is used to determine the cycles of concentration (COC)?

Free mineral acids

Carbon dioxide

Turbidityoxide

Chloride

35. Crevice corrosion occurs when a solution contains varying amounts of dissolved

Magnesium.

Oxygen.

Nitrogen.

Calcium.

36. What chemical testing system would you use on a small, noncritical system?

Continuous

Occasional

Manual

Spot

37. Which of the types of alkalinity will not cause scale?

Ionic alkalinity

Carbonate alkalinity

Hydroxide alkalinity

Bicarbonate alkalinity

38. The solenoid valve on the blowdown line of a cooling tower is energized when the

PH reaches 5

PH reaches 9

Water’s conductivity exceeds the meter setting

Water’s conductivity drops below the meter setting

39. When using a bypass feeder and special chemical briquettes, how do you adjust the chemical feed rate?

Adjusting the regulating valve.

Adjusting the length of the stroke on the pump.

Adjusting the frequency of the stroke on the pump.

Raising or lowering the chemical concentration level.

40. What item is particularly useful in monitoring the effectiveness of a chemical corrosion control program?

Acidic corrosion

The formation of scale

Caustic boiler seam cracks

Low levels of sludge formation

41. What type solution is used to boil out a new boiler?

An acidic solution

An alkaline solution

A strong soap solution

A distilled water solution

42. What problem could result from your chemical pump's feeding into the suction side of a system recirculating pump?

Excessive back-pressure causing high feed rates.

Low back-pressure causing low feed rates. rates.

A siphoning effect causing excessive output.tes.

A siphoning effect causing low pump output..tes.

43. During the external treatment of water to be used in a mechanical system, aeration is used to

Increase the CO2 level

Remove the CO2 level

Increase the CO level

Remove the CO level

44. What external water softening treatment process uses acid to help remove hardness from water?

Hot lime soda

Cold lime sodap

Sodium zeolitep

Hydrogen zeolite

45. The presence of hydrogen ions causes a solution to be

Turbid.

Acidic.

Neutral.

Alkaline.

46. The clarification process is used to remove

All silica from feedwater

Calcium and magnesium

Suspended impuritiesm