WASTEWATER TREATMENT OPERATOR CERTIFICATION EXAM

WASTEWATER TREATMENT OPERATOR CERTIFICATION EXAM
ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES|ALREADY GRADED A
1 mg/l is the same as 1 part per billion (ppb)

True or False - ANSWER: False (v.1 pg 468)

A SCADA system is capable of monitoring and controlling equipment from a remote
location

True or False - ANSWER: True (v.2 pg 627)

A Discharge Monitoring Report is typically submitted to the regulatory agency on a
daily basis

True or False - ANSWER: False

A mechanical seal is used to prevent leaks between the pump casing and shaft.

True or False - ANSWER: True (v.2 pg 356)

Alkalinity is the capacity of a liquid to neutralize a base.

True or False - ANSWER: False (v.2 pg 813)

Typical mixed liquor suspended solids concentration is 1,000 to 4,500 mg/l.

True or False - ANSWER: True (v.2 pg 54)

Turbidity is caused by suspended matters.

True or False - ANSWER: True (v.2 pg 606)

Algae is not essential to the successful operation of both aerobic and facultative
ponds.

True or False - ANSWER: False (v.1 pg 299)

The addition of acid and CO2 will lower the pH of wastewater.

True or False - ANSWER: True (v.1 pg 299)

Hydrogen sulfide will deteriorate concrete structures.

, True or False - ANSWER: True (v.1 pg 20)

The higher the pH, the better the disinfection - ANSWER: False (v.1 pg 352)

Maintain a dissolved oxygen concentration of 12 to 14 mg/l in the aeration tank.

True or False - ANSWER: False (v.2 pg 53)

When the velocity of the wastewater in a clarifier is greater in some sections than
others, it will lead to short-circuiting.

True or False - ANSWER: True (v.1 pg 135)

The F/M ratio will decrease when the microorganism population in the aeration tank
increases.

True or False - ANSWER: True (v.2 pg 16)

Algae growth will be faster when there is less sunlight.

True or False - ANSWER: False (v.1 pg 309)

The higher the temperature, the more rapid the rate of disinfection.

True or False - ANSWER: True (v.1 pg 352)

One of the benefits of recirculation for a trickling filter is that it decreases the
contact time of the wastewater with the biological film.

True or False - ANSWER: False (v.1 pg 175)

Maintaining a constant temperature in an anaerobic digester is one way to prevent
foaming from recurring.

True or False - ANSWER: True (v.2 pg 187)

Preventative maintenance is a proactive, programmed, and systematic approach to
maintenance.

True or False - ANSWER: True (v.2 pg 718)

Abnormal operation in a pond will not occur if it is overloaded with BOD.

True or False - ANSWER: False (v.1 pg 307)

Anaerobic decomposition of sewage will release hydrogen sulfide.