WasteWater Operator class C exam practice

WasteWater Operator class C exam practice review Questions and Correct Correct Answerwers Guaranteed A+ A colored dye solution is added into the raw wastewater entering a primary settling tank.The dye color was noticeable in the effluent in 15 min and all of the color had passed through the tank in 40 min. What does this indicate?

• Wastewater is passing through the tank too fast for effective settling
• Optimal detention time is being achieved
• This tank has a detention time of 40 min.
• This tank design has a detention time of 55 min. - Correct Answer A. Wastewater is

passing through the tank too fast for effective settling

A decrease in temperature will have what effect on disinfection?

• Require longer contact time
• Require shorter contact time
• Increase rate of disinfection
• Have no effect on disinfection - Correct Answer A. Require longer contact time

A good settling sludge would consist of what type of protozoa?

• Rotifers and nematodes
• Amoebas and Flagellates
• Stalked ciliates and mastagoria
• Free swimmers and stalk ciliates - Correct Answer D. Free swimmers and stalk

ciliates

A plant with a flow of 1 MGD should be monitored

• Continuously
• Intermittently
• Daily
• Every four hours depending on surface load - Correct Answer A. Continuously

According to FAC Ch. 62-600, Domestic WasteWater Facilities, your job s an operator during major process breakdowns is to?

• Maintain competent documentation and record keeping
• Report to the DEP within 24 hours after the problem is fixed
• Call the fire department
• Shut down the plant immediately - Correct Answer A. Maintain competent

documentation and record keeping

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After removing the roof of the chlorinator storage, building during the summer, the Cl2 stop feeding, what is the cause?

• The CPRV became clogged
• The tank got hotter than the manifold
• The external pressure reducer failed
• The tank is empty - Correct Answer B. The tank got hotter than the manifold

Amperometric titration is used to measure

• Dissolved solids
• Chlorine residual
• Colloids
• Emulsions - Correct Answer B. Chlorine residual

As an operator, how do you control the anaerobic digestion process?

• Microbial population and temperature
• H2S and methane concentration
• Temperature and rate of raw sludge feed
• Methane and Co2 production - Correct Answer C. Temperature and rate of raw

sludge feed

At what pH would disinfection be at its greatest?

• 9
• 7

C. 6.5

• 5 - Correct Answer D. 5

Before operating any piece of equipment what should be done?

• Lock out Tag out (remember, safety first!)
• Read O & M manual
• Read manufacturers manual
• Notify supervisor - Correct Answer C. Read manufacturers manual

Cathodic protection is used for what purpose?

• The prevention of corrosion to metals
• To avoid electrical shock
• Increase safety
• Protect utilities from lawsuits due to unsafe environments - Correct Answer A. The

prevention of corrosion to metals

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Chlorine is not coming out. Another cylinder is hooked up with the same problem occurring. What is the problem?

• Educator submerged
• Icing
• Manifold line is blocked
• POA too far - Correct Answer C. Manifold line is blocked

Chlorine leaks can be detected by?

A. ISCBA

• Ammonia solution with Q-Tip
• Alcohol vapor
• Spray with mist of water - Correct Answer B. Ammonia solution with Q-Tip

Cl2 combined with ammonia forms what?

• Hydrochloric acid
• Chloroammonia acid
• Chloramines
• Hypochlorous acid - Correct Answer C. Chloramines

Coliform bacteria are used for what?

• Process control changes
• Indicators of possible presence pathogenic organisms
• Prevent disease
• Remove Co2 residual in sample bottle - Correct Answer B. Indicators of possible

presence pathogenic organisms

Coliform count fails to meet standards your chlorine supply is not the problem. What is?

• Short circuiting and low contact time
• Chlorine has become stale
• High temps
• Lack of disinfectant bacteria - Correct Answer A. Short circuiting and low contact time

Concert 27* C to Fahrenheit

A. 81.6

B. 80.6

C. 106.2

• 86.1 - Correct Answer B. 80.6

Denitrification will cause what?

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