12.
The standard requirement for chlorine residual in water treated under field
conditions is _______________________ parts per million (ppm).
13.
The standard time allowed for disinfection from the time chlorine is added until
the time water is consumed is:
a. Ten minutes.
b. Twenty minutes.
c.
Thirty minutes.
d. Forty minutes.
14.
The continuous flow type water purification unit used by the Corps of Engineers
is called an ________________________________.
15.
Which of the following factors increase(s) the required chlorine residual in water?
a. Low pH (below 5.0).
b. High pH (above 5.0).
c.
Low temperature.
d. High temperature.
e. The presence of chlorine-demanding substances.
16.
Quartermaster and preventive medicine units test water for chlorine residual and
pH with the___________________________.
Check Your Answers on Next Page
MD0008
5-18