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CPO Practice QUESTIONS & ANSWERS 202 5/
( A+ GRADED 100% VERIFIED)
Which type of filter requires the least amount of water to clean? (A) Diatomaceous (B) Rapid rate sand (C) High rate sand (D) Cartridge - Correct Answer - (D) Cartridge Cyanuric acid (stabilizer) protects free chlorine (FC) against the effects of: (A) Pathogens like Crypto, Giardia, and Shigella (B) High Total dissolved solids (C) Ultraviolet rays from the sun (D) High PH - Correct Answer - (C) Ultraviolet rays from the sun An erosion chemical feeder is what type of feeder? (A) Peristaltic pump (B) Piston pump (C) Dry chemical feeder (D) Gas system - Correct Answer - (C) Dry chemical feeder OSHA requires aquatic facilities to maintain: (A) Safety Data Sheets only for sanitizing chemicals (B) Lifeguard certifications (C) Air temperature recordings (D) SDS's for all chemicals used at the facility - Correct Answer - (D) SDS's for all chemicals used at the facility
When mechanical cooling is used on an indoor therapeutic pool facility, the recommended ASHRAE fresh air exchange rate should be: (A) 2 to 4 exchanges per hour (B) 4 to 6 exchanges per hour (C) 6 to 8 exchanges per hour (D) As many as possible - Correct Answer - (B) 4 to 6 exchanges per hour What condition mandates an immediate closure of your swimming pool? (A) Locker room is not clean (B) Main drain not visible from the deck (C) No automatic feeders installed (D) No underwater lights installed - Correct Answer - (B) Main drain not visible from the deck The reagent commonly used to test PH is: (A) DPD (B) Sodium Thiosulfate (C) Coolomatic (D) Phenol red - Correct Answer - (D) Phenol red When should you backwash high rate sand filters that have a single pressure gauge? (A) After an 8 to 10 psi increase above starting pressure (B) Every 2 days (C) Once per week (D) When the influent and effluent gauges are 10 to 20 psi apart - Correct Answer - (A) After an 8 to 10 psi increase above starting pressure Oxidation Reduction Potential testing (ORP) is measured in: (A) Parts per million (ppm) (B) Millivolts (mV) (C) Gallons per minute (gpm)
(C) Sodium bisulfate (D) Calcium chloride - Correct Answer - (C) Sodium bisulfate In a circulation system, the commonly accepted practice is to have: (A) 75% of the water return from the main drain (B) 50%of the water return via the main drain and 50% from the surface (C) 10% of the water return via the surface and 90% from the main drain (D) 75% of the water return from the surface - Correct Answer - (D) 75% of the water return from the surface There is a diarrheal accident in 206,000 gallon pool. According to the CDC, the first step you should take to correctly handle this incident is: (A) Remove all the swimmers from the pool (B) Remove the excrement from the pool (C) Backwash the filters (D) add 20 lbs. sodium bicarbonate - Correct Answer - (A) Remove all the swimmers from the pool If you have sand from your filter returning to the pool through the inlets, what is the likely cause? (A) Sand bed blocked (B) Broken filter laterals (C) Blocked filter laterals (D) Too frequent backwash cycle - Correct Answer - (B) Broken filter laterals Which procedure is used to determine the level of combined chlorine in water? (A) Test for free chlorine and pH, then divide the pH number by the free chlorine number (B) Test for total chlorine and combined chlorine, then subtract the combined chlorine number from the total chlorine number (C) Test for free chlorine and total chlorine, then subtract the free chlorine number from the total chlorine number (D) Test for total alkalinity and pH, then multiply the total alkalinity number by the pH number - Correct Answer - (C) Test for free chlorine and total chlorine, then subtract the free chlorine number from the total chlorine number
You are the operator for a pool which is 75 feet long and 48 feet wide. The pool bottom has a constant slope which is 4 feet deep at the shallow end, and 6 feet deep at the deep end. What is the volume of this pool in gallons? (A) 135,000 gallons (B) 125,000 gallons (C) 145,000 gallons (D) 140,000 gallons - Correct Answer - (A) 135,000 gallons You operate a pool which uses high rate sand filters. You discover that your filter tank has developed a major leak and must be replaced. Your pool operates with a flow rate of 625 gmp. Using a filter media t=rate (fmr) of 12 gallons per minute, what size sand filter would you need to replace your damaged filter? (A) 50 sq. ft. (B) 36 sq. ft. (C) 38 sq. ft. (D) 52 sq. ft - Correct Answer - (D) 52 sq. ft What is the best practice to prevent algae growth? (A) Raise the pH (B) Routinely brush pool and spa walls (C) Increase pool water temperature (D) Use UV as a supplement - Correct Answer - (B) Routinely brush pool and spa walls The presence of galvanic corrosion in water is signaled by: (A) Discoloration of metal parts submerged in water (B) TDS level 1,500 ppm higher than make-up water TDS level (C) Saturation index less than - 0. (D) Water tinted blue - Correct Answer - (A) Discoloration of metal parts submerged in water If there is a diarrheal incident in your pool, according to the Centers for Disease Control and Prevention (CDC), you must raise the free chlorine level to 20 ppm and keep it there for: (A) 12.75 hours
(B) After the filter and the heater (C) In the return line after all of the equipment (D) Before the pump - Correct Answer - (D) Before the pump Which chlorine type tends to lower the pH level in the water? (A) Lithium hypochlorite (B) Calcium hypochlorite (C) Sodium hypochlorite (D) Trichlor - Correct Answer - (D) Trichlor To be classified as a disinfectant, a chemical must kill or inactivate 99.99% of contaminates and: (A) Maintain proper water balance (B) Be biodegradable (C) Leave a measurable residual in the water (D) Have a sweet smelling aroma - Correct Answer - (C) Leave a measurable residual in the water What is the likely result if the alkalinity of the pool water is greater than 180 ppm? (A) Etching of pool surface (B) pH bounce (C) pH lock (D) Corrosion of metals - Correct Answer - (C) pH lock Which chemical is used to raise the total alkalinity level? (A) Sodium hypochlorite (B) Sodium chloride (C) Sodium bicarbonate (D) Cyanuric acid - Correct Answer - (C) Sodium bicarbonate Legionnaire's disease is spread by: (A) Breathing contaminated water droplets
(B) Ingestion (C) Direct skin contact (D) Contaminated water in the ear - Correct Answer - (A) Breathing contaminated water droplets Which type of filter system will remove the smallest particles? (A) Rapid rate sand (B) Zeolite (C) High rate sand (D) Diatomaceous earth - Correct Answer - (D) Diatomaceous earth Before daily pool opening, what is the first area that should be inspected? (A) Pool/ Spa and deck (B) Barriers (C) Pump room (D) Bathhouse and restroom - Correct Answer - (A) Pool/ Spa and deck Which filter media would not require a dust mask when handling and storing? (A) Silica sand (B) Cartridge (C) Diatomaceous earth (D) Zeolite - Correct Answer - (B) Cartridge You operate a 50,000 gallon indoor pool, and your chemcial test readings are: total available chlorine is 3.0, and a free available chlroine is 1.5. How much calcium hypochlorite is needed to reach breakpoint? (A) 3.7 lbs. (B) 5.6 lbs., (C) 8.4 lbs. (D) 9.4 lbs. - Correct Answer - (C) 8.4 lbs. What is the maximum spa water temperature typically allowed? (A) 100 degrees F
You are receiving complaints about a strong chlorine odor in the pool area, and several people have complained of eye irritation. The most likely cause is: (A) High levels of chloramines in the water (B) Too few swimmers in the pool (C) High calcium levels in the water (D) Too much free chlorine in the water - Correct Answer - (A) High levels of chloramines in the water The result of channeling in a sand filter includes: (A) Water leaking from the filter (B) More particles being removed by the filter (C) The water overflowing in a filter (D) Unfiltered water returning to the pool - Correct Answer - (D) Unfiltered water returning to the pool Ferrous ammonium sulfate (FAS-DPD) is what kind of test method? (A) Colorimetric (B) Turbidimetric (C) Electronic (D) Titrimetric - Correct Answer - (D) Titrimetric Which is the best method to prevent electrocution? (A) Use a lock out/ tag out devise (B) Wear face protection (C) Have someone turn the power off for you (D) Use metal ladders only - Correct Answer - (A) Use a lock out/ tag out devise You are the operator of a 100,000 gallon outdoor pool. The water tests give you the following readings: total alkalinity is 75 ppm, pH is 7.6, calcium hardness is 200 ppm, temperature is 76 degrees F, and a total dissolved solids is 1,100 ppm. What is the Saturation Index for this pool? (A) - 0. (B) + 0. (C) - 0.
(D) +0.1 - Correct Answer - (A) - 0. Emergency Response Plans must include all of the following EXCEPT: (A) Opening and closing checklist (B) Staff training requirements (C) Alarm signals and their meaning (D) Actions and procedures for staff member response in an emergency - Correct Answer - (A) Opening and closing checklist Where should the water sample be collected from for chemical testing? (A) int he deepest part of the pool (B) At the pool water surface (C) 18 inches below pool water surface away from return inlets (D) in front of a return inlet - Correct Answer - (C) 18 inches below pool water surface away from return inlets You operate a wading (kiddie) pool which has 7,500 gallons of water. The health code requires your pool to operate on a 2- hour turnover rate. What would the flow rate required to achieve this turnover rate be? (A) 625 gpm (B) 62.5 gpm (C) 750 gpm (D) 75 gpm - Correct Answer - (B) 62.5 gpm
