CPO Practice Test Bank | Accurate UPDATED ACTUAL Exam
Questions and CORRECT Answers with Solutions Graded A+
100% Verified
Question 1.
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
Question 2.
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
Question 3.
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
Question 4.
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
Question 5.
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
Question 6.
The reagent commonly used to test PH is: (A) DPD (B) Sodium Thiosulfate (C) Coolomatic
(D) Phenol red
Correct Answer: (D) Phenol red
, Question 7.
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
Question 8.
Oxidation Reduction Potential testing (ORP) is measured in: (A) Parts per million (ppm)
(B) Millivolts (mV) (C) Gallons per minute (gpm) (D) Free available chlorine (FAC)
Correct Answer: (B) Millivolts (mV)
Question 9.
How much sodium thiosulfate would you need to lower the free chlorine from 18 ppm to
2.0 ppm in a 150,000 gallon pool? (A) 35 lbs. (B) 30 lbs. (C) 25 lbs. (D) 39 lbs.
Correct Answer: (D) 39 lbs.
Question 10.
Evaporation heat losses from a pool are highest under which environmental condition?
(A) High relative humidity (B) Low relative humidity (C) Clear sky (D) Low barometric
pressure
Correct Answer: (B) Low relative humidity
Question 11.
The daily opening checklist should be used to: (A) Check the design of the facility (B)
Ensure all safety equipment is in place (C) Check that all ground wires are properly
connected (D) Ensure the heater is properly sized
Correct Answer: (B) Ensure all safety equipment is in place
Question 12.
You have a 25,000 gallon hotel pool with a calcium hardness level of 170 ppm. How
much calcium chloride (77%) would be required to increase this to 250 ppm? (A) 20 lbs.
(B) 25 lbs. (C) 18 lbs. (D) 24 lbs.
Correct Answer: (D) 24 lbs.
Question 13.
Which chemical is sued to lower the pH value of pool or spa water? (A) Sodium
bicarbonate (B) Fresh water (C) Sodium bisulfate (D) Calcium chloride
Correct Answer: (C) Sodium bisulfate
Questions and CORRECT Answers with Solutions Graded A+
100% Verified
Question 1.
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
Question 2.
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
Question 3.
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
Question 4.
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
Question 5.
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
Question 6.
The reagent commonly used to test PH is: (A) DPD (B) Sodium Thiosulfate (C) Coolomatic
(D) Phenol red
Correct Answer: (D) Phenol red
, Question 7.
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
Question 8.
Oxidation Reduction Potential testing (ORP) is measured in: (A) Parts per million (ppm)
(B) Millivolts (mV) (C) Gallons per minute (gpm) (D) Free available chlorine (FAC)
Correct Answer: (B) Millivolts (mV)
Question 9.
How much sodium thiosulfate would you need to lower the free chlorine from 18 ppm to
2.0 ppm in a 150,000 gallon pool? (A) 35 lbs. (B) 30 lbs. (C) 25 lbs. (D) 39 lbs.
Correct Answer: (D) 39 lbs.
Question 10.
Evaporation heat losses from a pool are highest under which environmental condition?
(A) High relative humidity (B) Low relative humidity (C) Clear sky (D) Low barometric
pressure
Correct Answer: (B) Low relative humidity
Question 11.
The daily opening checklist should be used to: (A) Check the design of the facility (B)
Ensure all safety equipment is in place (C) Check that all ground wires are properly
connected (D) Ensure the heater is properly sized
Correct Answer: (B) Ensure all safety equipment is in place
Question 12.
You have a 25,000 gallon hotel pool with a calcium hardness level of 170 ppm. How
much calcium chloride (77%) would be required to increase this to 250 ppm? (A) 20 lbs.
(B) 25 lbs. (C) 18 lbs. (D) 24 lbs.
Correct Answer: (D) 24 lbs.
Question 13.
Which chemical is sued to lower the pH value of pool or spa water? (A) Sodium
bicarbonate (B) Fresh water (C) Sodium bisulfate (D) Calcium chloride
Correct Answer: (C) Sodium bisulfate
