Texas Water Operator Class D Exam Prep FREE Sample Exam

A groundwater treatment system serves 820 people through only 210 connections. A former Class D holder applies for a new Class D license to operate that system. What is the result?

The application is approved, because the connection count is under 250 and that is the only size test that is ever applied

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The application is approved, because population limits apply only when a license is renewed

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The application is approved if a supervisor co-signs the application form

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The new Class D application is barred, because a groundwater treatment system serving 750 or more people is one of the categories closed to a new Class D license

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An operator arrives to read a meter inside a fenced yard. A large dog inside the fence charges the gate, barking and lunging, and no one answers at the house. What should the operator do?

Stay out of the yard, back away safely, and arrange through the customer or a supervisor for the visit to happen when the dog is secured

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Enter quickly and finish the reading before the dog reaches the far side of the yard

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Offer the dog treats from the truck until it calms down and accepts the operator, then enter the yard and take the reading as planned without further delay

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Open the gate and use a garden hose to keep the dog at a distance while reading

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A Texas operator records how much of each chemical the system uses. How long must those chemical-amount records be kept?

At least two years.

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At least three years.

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At least five years.

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At least ten years.

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What is the multiple-barrier principle in drinking-water protection?

Running all of the water through the same treatment process twice to be doubly sure it works

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Relying on disinfection alone because it is the strongest step

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Layering source protection, treatment, and disinfection so each barrier backs up the others

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Testing the finished water more often instead of improving treatment

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A system plans extra surface-protection vigilance for wells drilled in cracked limestone country full of sinkholes. Why do these wells need the extra vigilance?

Openings and fractures let spilled or surface contaminants reach the groundwater quickly, with little natural filtering along the way.

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Limestone groundwater in contact with the casing slowly dissolves the steel casing from the outside inward until the casing wall fails and the well begins taking in surface water.

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Sinkholes drain the water table downward so the wells run dry every summer season.

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Fractured rock formations make the groundwater far too hard for customers to use.

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What is the purpose of a watertight well cap on top of a well casing?

To carry the full weight of the pump, motor, and drop pipe assembly hanging inside the well casing

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To give the operator a way to measure the depth of water standing in the well

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To vent air freely in and out of the casing whenever the pump starts and stops

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To seal the top of the casing so insects, debris, and surface water cannot enter the well

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Heavy rain falls across the watershed overnight, and by morning the raw water arriving at a plant’s intake has turned brown and its turbidity has climbed sharply. What should the crew expect and do?

Expect a much heavier solids load on the treatment processes, and keep the operator in charge informed as raw-water conditions change.

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Expect the heavy rain to improve the raw water by diluting everything dissolved in the river, so the plant can relax its treatment and monitoring until the river settles back down.

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Expect no change at the plant, because turbidity is a problem only in groundwater systems.

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Expect the plant to need no extra monitoring until the river water clears up on its own.

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Before deciding whether to start a second well, an operator checks how much finished water is in storage by reading the tank’s level gauge at ground level. What has the gauge provided?

The pressure in the distribution zone served by the tank at the far end of the zone during the morning peak demand period

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The current water level, and therefore the stored volume available, without climbing the tank

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The chlorine residual of the water stored in the tank

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The flow rate at which the tank is filling

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While repairing a copper service line, an operator finds the only solder on the truck is labeled as containing 0.3 percent lead. What should the operator do?

Use it, because the 0.25 percent limit for pipes and fittings is the limit that governs the repair

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Not use it, because solder and flux must not exceed 0.2 percent lead

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Use it on the hot-water side only, where the water sits in contact with the joint for less time

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Use it to finish the repair, then flush the service line for ten minutes before returning it

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A hypochlorite solution feeder is running, but no chlorine is reaching the water and the residual is dropping. The operator finds the solution tank nearly empty and the suction line drawing air. What is the correct diagnosis and fix?

The water has stopped exerting demand, so no chlorine feed is needed

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The DPD reagent has expired, and the actual residual in the system is unchanged from yesterday's reading

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The distribution system is full, so chlorine can no longer enter it

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Refill the solution tank and restore the suction feed so the feeder regains prime

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An operator is about to open an ultraviolet disinfection unit to replace a lamp. What safety step comes first?

Leave the lamps lit so the operator can see which one has failed

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Look directly into the lit lamp to check that it is still producing light

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Shut off power to the lamps and let them cool before opening the unit

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Spray the lit lamps with water to cool them before touching the unit

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A system treats 0.53 MGD and applies a chlorine dose of 4.2 mg/L. How many pounds of chlorine per day are required?

2.23 lb/day

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17.81 lb/day

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18.56 lb/day

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20.03 lb/day

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Texas Water Operator Class D Exam Prep FREE Sample Exam — Fixed Set

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