2027 Exam 120 Questions with 100% Verified Correct
Answers Guaranteed A+
A commonly used method to test for chlorine residual in water is called the _____ method.
a. HTH
b. THM
c. VOC
d. DPD - CORRECT ANSWER: DPD
A high level of ______ in the water can cause the "blue-baby" syndrome - CORRECT
ANSWER: Nitrates
According to the safe water drinking act, the basic definition of public water supply system is
any water system that supplies water for human consumption that serves: - CORRECT
ANSWER: 15 service connections or over 25 persons for over 60 days a year
After a jar test is completed, what does a hazy settled water indicate? - CORRECT ANSWER:
Poor coagulation
Alkalinity consist predominately in which of the following forms?
Bicarbonate, carbonate, and hydroxide
carbon dioxide and bicarbonate
carbonate and carbon dioxide
carbonate, carbon dioxide, and bicarbonate - CORRECT ANSWER: Bicarbonate, carbonate, and
hydroxide
Always add acid to water, never the reverse. - CORRECT ANSWER: True
, An alkalinity determination is needed when calculating chemical doses used in what water
treatment processes?
1) coagulation
2) filtration
3) flocculation
4) settling
5) softening - CORRECT ANSWER: 1,5
Baffling inside a storage facility may be needed to prevent "hot spots" and
a. straight through flows
b. long contact times with disinfectants
c. high chlorine residuals throughout the facility
d. high temperatures throughout the storage facility - CORRECT ANSWER: straight through
flows
Calcium hypochlorite (Ca(OCl)2) - CORRECT ANSWER: granular Chlorine , Available
Chlorine 40-78%
Chlorine expands approximately how many times from liquid to gas? - CORRECT ANSWER:
450
Completely empty volumetric pipets by blowing out the small amount remaining in the tip -
CORRECT ANSWER: false
Federal laws include sludge from a water treatment plant as an industrial waste and require
proper handling and disposal. - CORRECT ANSWER: true