California Water Treatment Operator Exam, Operation and Maintenance: all 36 questions
All questions from the Operation and Maintenance section for California Water Treatment Operator Exam, each with the correct answer.
- 3001A centrifugal pump that runs but delivers little or no water immediately after being started has most likely lost its
- 3002What is cavitation in a pump?
- 3003Which pump type moves water by trapping fixed volumes and is often used for chemical metering?
- 3004Why should a positive displacement pump never be started against a closed discharge valve?
- 3005A centrifugal pump is operated with its discharge valve closed for a long time. What is the most likely result?
- 3006What is the main purpose of the packing gland on a pump with packed stuffing box?
- 3007A mechanical seal is used on a pump shaft instead of packing because it
- 3008Which type of valve is best suited for throttling flow?
- 3009A check valve is installed on a pump discharge line to
- 3010Water hammer is caused by
- 3011An operator hears a loud grinding noise and notices that a pump motor is running hot. The first action should be to
- 3012Lubricating a motor bearing with too much grease can cause
- 3013What does an ammeter reading higher than the nameplate full-load amps on a pump motor suggest?
- 3014Lock-out/tag-out procedures must be followed before
- 3015A diaphragm metering pump is feeding too little chemical. A likely cause is
- 3016To calibrate a chemical feed pump, an operator would normally
- 3017A chemical feed pump is set to deliver 40 mL per minute. How many gallons per day is that? (1 gal = 3,785 mL)
- 3018Which of the following is a function of an anti-siphon (back pressure) valve on a chemical feed line?
- 3019A dry chemical feeder that delivers a measured weight or volume of powder per time is called a
- 3020Chlorine gas feed systems often use a vacuum regulator because
- 3021What is the purpose of a venturi or ejector in a chlorine gas feed system?
- 3022A water meter that measures flow by the movement of a spinning rotor or turbine inside the pipe is a
- 3023A meter reads 458,320 gallons on Monday morning and 512,820 gallons on Tuesday morning. What was the daily use in gallons?
- 3024The accuracy of a flow meter is checked by
- 3025A pressure gauge on a pump discharge reads 0 psi while the pump is running. This most likely indicates
- 3026Total dynamic head of a pump is the
- 3027What does SCADA stand for in water treatment?
- 3028In a 4 to 20 mA instrument signal, 4 mA normally represents
- 3029A transmitter ranges 0 to 100 gpm on a 4 to 20 mA signal. The signal reads 12 mA. What is the flow?
- 3030A standby generator at a treatment plant should be
- 3031An automatic transfer switch is used to
- 3032A blower or compressor that produces unusually high vibration and noise should be
- 3033The primary function of a surge tank or hydropneumatic tank is to
- 3034Which operating practice reduces the number of pump starts per hour and protects the motor?
- 3035An on-line chlorine analyzer shows a steady reading that disagrees with a grab sample test. The operator should first
- 3036Which of the following helps prevent damage to a well pump motor from running dry?