Certified Pool Operator Handbook Practice Test - 2017

79. Heat loss to the ground from a pool through its sides, bottom, pipes and filters is called .

conduction

92. Green water that is transparent is usually due to .

copper ions in the water

35. Which of the following would not be considered an acceptable ADA access method?

corner steps with a vertical rise of less than 11 inches

16. Which type of filter system will remove the smallest micron particles?

diatomaceous earth

24. The only physical factor that affects water balance is:

temperature

4. To determine the level of chloramines in the water, you should do which of the following?

test for total chlorine and free chlorine, then subtract the free chlorine number from the total chlorine

23. Channeling of filters occurs when:

the FMR is exceeded, and water cuts a channel through the media

27. When balancing swimming pool water, the following should be adjusted first:

total alkalinity

110. The solid chlorine compound which is used when a slow release of chlorine over time is desired is called:

trichlor

80. Water clarity is measured in units of .

turbidity

83. What is the name of the area of a centrifugal pump that converts water energy from velocity to pressure?

volute

7. You are the operator of a 330,000 gallon outdoor pool. Your local health department requires you to perform a water balance calculation once monthly. Upon performing the water tests necessary to perform this calculation, you observe the following readings in your pool: Total alkalinity is 50 ppm pH is 7.2 Calcium Hardness is 150 ppm Temperature is 76 degrees F Total Dissolved Solids is 500 ppm Using these readings, what is the Saturation Index for this pool?

-0.8

103. The commonly accepted amount of precoat for DE filters is ____ pounds per each sq. ft. of surface area.

0.125

5. You operate a 45,000 gallon indoor pool, and upon doing your hourly chemical tests you observe the following readings:Total available chlorine is 2.2 Free available chlorine is 1.4 and pH is 7.6 What is the level of chloramines in this pool?

0.8

104. To destroy harmful organisms in pool water, the accepted minimum of free chlorine is ____ ppm and many health codes set the maximum FC at ppm.

1, 5

12. You are the operator of a 3,000 gallon health club spa, which has an average of 100 users per day. According to the CPO Handbook, how often should the water in this spa be changed?

10 days

107. Sodium hypochlorite in its commercial form contains percent available chlorine.

10-12

82. According to the Certified Pool - Spa Operator Handbook, cyanuric acid levels shall not exceed local health codes. In many cases the limit is ppm.

100 ppm

10. You are the CPO for a 28,000 gallon hotel pool. You perform a water balance chemical test, and to your surprise, the Calcium Hardness is only 100 ppm. How much calcium chloride (77%) would be required to increase this to 400 ppm?"

100.8 lbs.

11. You are the CPO for a 100 foot long, 50 foot wide country club pool. The average depth of this pool is 7 feet. You return to the pool on Monday morning, after a rare weekend off, and find that the auto-fill feature has failed to work, and the pool water level is four inches too low. How many gallons of water must be added to return the water to the proper level?

12,495 gallons

100. The flow requirement of a rapid rate sand filter during backwashing is gpm per sq. ft.

12-15

67. When determining the degree of saturation and pool water the constant (12.1) includes a factor for Total Dissolved Solids (TDS), assuming a value of less than 1,000 ppm TDS. When the TDS is found to be higher (1,000-2,000 ppm) a value of should be used for the constant."

12.2

48. What is considered the necessary backwash rate to achieve proper agitation when backwashing sand filters?

15 gpm/sf

29. When performing a water test, sample water should be collected:

18 inches below the surface, away from return line

101. The backwash ratio for high rate sand filters is ____

1:1

102. is the maximum flow rate per sq. ft. for both pressure and vacuum type DE filters in public pools without slurry.

2 gpm

47. The amount of unfiltered water is reduced to after four turnovers.

2%

89. In a pool containing 35,000 gallons which is 15 x 40 ft with the temp of 65 degrees F, BTU's would be required to raise the water temperature to 75 degrees F if the air temp is 65 degrees F.

2,915,500

87. According to The Certified Pool - Spa Operator Handbook, pressure head is calculated by multiplying the psi by .

2.31

88. 1 pound per square inch (psi) is the pressure created by a column of water feet high.

2.31

105. With an incident of diarrheal discharge in a pool, the free available chlorine should be raised to _____ ppm.

20

72. According to the Certified Pool - Spa Operator Handbook, filtration and recirculation pumps should operate _______________ hours continuously for public spas and therapy pools.

24

71. Spas and hot tubs require a higher level of chlorine than in swimming pools. The free available chlorine concentration should be maintained at ppm with hourly checks during heavy use.

3 0-5.0

99. The most widely accepted flow rate for rapid rate sand filters in a public pool is per sq. ft.

3 gpm

2. Assuming that your local health department requires you to raise the free chlorine to 5 ppm, how much sodium hypochlorite would be needed to raise the free chlorine in the pool in question #1 to that level?

3.5 gallons

32. You are a service tech and have gotten a contract to maintain a small motel pool. Upon examining the operational records, you find that the number of gallons in the pool is not listed in the records. You visit the pool and observe that it is a fairly rectangular concrete pool, with the following dimensions: length = 40 feet; width = 20 feet. The pool bottom slope is constant from the shallow end, which is 3 feet deep, to the deep end, which is 8 feet deep. What is the total number of gallons of water in this pool?

33,000 gallons

60. According to the Certified Pool - Spa Operator Handbook, to provide proper building protection and comfort to users the humidity levels for indoor pools and spas should be maintained between

40 to 60%

91. Pool surface area accounts for percent of heat loss.

50

average). You begin to get complaints from the bathers that their eyes are burning and their skin itches after soaking."

6 days

84. How much sodium bicarbonate should be added to a 2,000 gallon spa to increase the total alkalinity by 14ppm?

6.27 oz

38. One cubic foot of water weighs pounds.

62.4

108. Calcium hypochlorite contains percent available chlorine by weight.

65

66. According to the Certified Pool - Spa Operator Handbook, the acceptable pH reading is:

7 2 to 7 8

111. Proper pH control of provides better chlorine efficiency.

7.2-7.4

37. One cubic foot of water contains gallons.

7.48

30. Swimming pool circulation systems should be adjusted to remove:

75% from the surface

90. To raise FC in a 20,000 gallon pool by 2.0 ppm would require ounces of calcium hypochlorite.

8

115. In determining cost for heating, it is best to size the heater to the number of gallons of water in the spa and in the spa and to the desired temperature. BTUs will heat 1 gallon of water 1 degree F.

8.33

39. One gallon of water weighs pounds.

8.33

46. What is the ideal range for total alkalinity?

80 to 120 ppm

113. It is essential to maintain total alkalinity at ppm in plaster pools.

80-120

70. According to the Certified Pool - Spa Operator Handbook, the ideal level for total water alkalinity is ppm

80-120

114. To control scaling, pool water that exceeds ppm hardness should be diluted or replaced with water of substantially lower hardness.

800-1000

32. b.)You are a service tech and have gotten a contract to maintain a small motel pool. Upon examining the operational records, you find that the number of gallons in the pool is not listed in the records. You visit the pool and observe that it is a fairly rectangular concrete pool, with the following dimensions: length = 40 feet; width = 20 feet. The pool bottom slope is constant from the shallow end, which is 3 feet deep, to the deep end, which is 8 feet deep.B). To achieve a 6 hour TOR in this pool, what flow rate would be needed?

92 GPM

116. A _________ is used to radiate the high temperature of the water and cool it enough to allow the remainder of the circulation piping to the PVC.

Heat sink

15. Safety and rescue equipment should always be:

Kept easily accessible around the pool

14. In testing for Chlorine/Bromine in a commercial pool, DPD is preferred over OTO because:

OTO only tests for Total Chlorine

8. To adjust the tested Total Alkalinity in the pool in question #7 to an acceptable level, which chemical would be most appropriate?

Sodium Bicarbonate

9. To adjust the tested pH in the pool in question #7 to an acceptable level, which chemical would be most appropriate?

Sodium Carbonate

21. Opening and closing checklists:

all of the above

"13. You are the CPO for a large municipal swimming pool. This pool has a volume of 560,000 gallons of water,and has an average daily bather load of 1300 people. The pool is operated using high rate pressure sand filters. How often should you backwash the filters?"

When the influent and effluent gauges are 10 to 20 psi apart

69. Water with a pH of less than 7.0 is said to be:

acidic

31. Vacuuming of the pool bottom should be done:

after foreign matter has settled

26. Pools using chlorine gas as a disinfectant produce hydrochloric acid, which can be neutralized with:

caustic soda or soda ash

1. You operate a 120,000-gallon pool, and upon performing your hourly chemical tests you observe the following readings: Total Available Chlorine reading is 1.6 free available chlorine reading is 1.5 pH is 7.4 Your supervising lifeguard has just informed you that you have had a fecal incident occur; a solid stool has been discharged into the pool. According to the Centers for Disease Control, as the CPO, you should do the following:

clear the pool and raise the free chlorine to 2 ppm

19. High calcium hardness can result in what condition?

cloudy water

22. You can become sick from ingesting water infected with Legionella bacteria

false

17. If the pump fails to prime, which of the following does not have to be checked?

filter system pressure is too high

106. Chlorine added after the breakpoint is reached will exist as .

free chlorine

81. A valve has a vertical disc or wedge attached to a long threaded stem that when rotated either seals or unblocks the flow of water.

gate

3. You are the CPO for an indoor health club pool. The facility manager informs you that he is receiving complaints about a strong chlorine odor in the pool area, and several members have complained of eye irritation. The most likely cause of these complaints is:

high levels of chloramines in the pool

34. When performing a color matching water test, when using the comparator, you should:

hold the sample up to the horizon opposite the sun or a daylight illuminator

25. To be classified as a disinfectant, a compound must kill or inactivate 99.9% of contaminants as well as:

leave a measurable residual in the water

41. What effect does gas chlorine have on pH in water?

lowers

78. The addition of Trichlor Tables to a swimming pool has what effect of the pH level?

lowers pH

18. Oxidation Reduction Potential testing (ORP) is measured in?

mV

20. Head first entry dives are:

only allowed in areas of the pool that are not marked as 'NO DIVING'

36. According to the Certified Pool - Spa Operator Handbook, which of the following should result in the immediate closure of a pool or spa?

ph level is 8.0

61. What is the process of replacing used diatomaceous earth powder with fresh powder called?

pre.coating

32. c.) You are a service tech and have gotten a contract to maintain a small motel pool. Upon examining the operational records, you find that the number of gallons in the pool is not listed in the records. You visit the pool and observe that it is a fairly rectangular concrete pool, with the following dimensions: length = 40 feet; width = 20 feet. The pool bottom slope is constant from the shallow end, which is 3 feet deep, to the deep end, which is 8 feet deep.C). You notice a clear greenish tint to the water. What could be the problem?

presence of copper

28. A spa with water tested as pH 7.2, temperature 103, calcium hardness 600, total alkalinity 120, and tds of 1,500 will be:

scale forming

109. Bromine is similar in many respects to chlorine, however, bromine cannot be used for .

stabilization

85. Pools of similar surface area located in the same geographical region, but with differing water depths will have the same .

surface heat loss