Chemical Reaction Quiz

50 Questions

Settings
Please wait...
Chemical Reaction Quizzes & Trivia

.


Questions and Answers
  • 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..