Ontario Operator-in-Training (OIT) Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Study for the Ontario Operator-in-Training (OIT) Exam. Sharpen your knowledge with flashcards, multiple choice questions, and detailed explanations. Be fully prepared for your licensing exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What is the definition of chlorine residual in water?

The amount of chlorine that evaporates during treatment
The amount of chlorine that remains in water after disinfection
The total chlorine added to the water supply
The volume of chlorine used in flocculation

The correct answer is: The amount of chlorine that remains in water after disinfection

Chlorine residual refers to the amount of chlorine that remains in water after the disinfection process has taken place. This residual is important because it helps to ensure that any remaining pathogens are eliminated, providing a safeguard against potential contamination that could occur after treatment. Having a measurable chlorine residual indicates that there is still an effective concentration of chlorine present, which is crucial for maintaining water safety throughout the distribution system. The other options do not capture this concept accurately. The evaporation of chlorine during treatment is not relevant to the definition of residual, as residual refers specifically to what remains after disinfection. The total chlorine added does not account for what is actively remaining after reactions and processes have occurred. Similarly, chlorine used in flocculation deals with the coagulation process of particles, which is distinct from the disinfection function of chlorine and does not pertain to the leftover amounts post-disinfection.