







Study with the several resources on Docsity
Earn points by helping other students or get them with a premium plan
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Community
Ask the community for help and clear up your study doubts
Discover the best universities in your country according to Docsity users
Free resources
Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors
A set of multiple-choice questions and answers related to cwea collections system maintenance, covering topics such as confined space safety, sewer system maintenance, and odor control. It is a valuable resource for individuals preparing for cwea grade 3 certification exams or those seeking to enhance their knowledge in wastewater collection system maintenance.
Typology: Exams
1 / 13
This page cannot be seen from the preview
Don't miss anything!
A Flagger should Stand? A. On the shoulder adjacent to traffic being controlled B. In the closed lane before stopping vehicle traffic C. In the traffic lane.
"B" above. Legally responsible officials are required to report category 1 sanitary sewer overflows? A. Within 30 days B. Before end of the day C. As soon as possible
When working in confined spaces or sewers, what form of lighting would you use? A. Mirrors to direct the sunlight or explosion proof lighting. B. Ordinary electric lights C. Propane, Gas, or kerosene lanterns
explosion proof lighting. What can happen if water-based substances are used to extinguish electrical fires? a. Nothing but extinguish the fire b. The fumes are not harmful c. Receive an electrical shock
electrical shock When testing a manhole for explosive gases when should the first tests be made? a. After removing the manhole cover b. Before removing the manhole cover c. At any time
cover Atmospheric hazards encountered in manholes can include:
a. non-explosive atmospheres. b. non-toxic atmosphere. c. lack of oxygen.
When setting up to ventilate a manhole, the air inlet should be how many feet above street level? a. 4. b. 3. c. 2.
Which chemical may be used for odor control in a sewer system? a. Calcium chloride b. Hydrogen peroxide c. Oxidized aluminum
What information must be on a warning tag attached to a switch that has been locked out? a. Directions for removing tag. b. Name of nearest physician to call in case of emergency. c. Signature of person who locked out switch and who is the only person authorized to remove tag.
locked out switch and who is the only person authorized to remove tag. Under what conditions must each member of the rescue service practice permit space rescues? a. At least once a year in a simulated situation or by the satisfactory performance of an actual rescue. b. At least twice a year in simulated situations. c. At least once a year in simulated situation using non-representative space conditions
simulated situation or by the satisfactory performance of an actual rescue. How is a permit-required space described? a. Has or may contain atmospheric, engulfment, design, or other serious health/safety hazard. b. Is large enough to enter and work in and is meant for continuous occupancy. c. Is large enough to enter and work in and has an unrestricted entry/exit.
health/safety hazard.
c. Combination unit
In sewer maintenance, what is a pig? a. A ball forced through a sewer line. b. A power rod. c. Any foul smelling equipment.
sewer line. When pouring a concrete slab, which of the following tools is used to finish the concrete? a. Grasshopper. b. Tamper. c. Trowel.
What tool is used to snare a broken section of sewer rod? a. Square stock corkscrew. b. Auger. c. Pickup tool.
Why is the replacement of wastewater collection systems in some downtown streets difficult? a. Crowding of other underground utilities. b. Records have not been maintained properly and the collection system is lost. c. Some people have landscaped their backyards over the collection system and do not want their yards dug up.
of other underground utilities. How can the velocity of water flowing in a sewer be estimated? a. Driving between manholes and reading the speedometer. b. Measuring the Manning's roughness coefficient for the sewer. c. Measuring the time it takes for the dye to be carried by the wastewater between the two manholes.
between the two manholes. Drawings which are considered "As Built" would be? a. Construction drawings issued to the contractor. b. Corrected construction drawings showing changes made in the field installation.
c. Detailed drawings of proposed construction.
drawings showing changes made in the field installation. In lieu of a shorting system, the sides or the walls of an excavation, or trench, may be: a. sloped 3:1. b. sloped 1:3. c. sloped 2:1.
When a water main must be laid under a sewer main, the sewer pipe must be: a. lined with epoxy. b. cleaned carefully. c. replaced with water type pipe with pressure tight joints.
replaced with water type pipe with pressure tight joints. Hydrogen peroxide controls odors in sewers by: a. decreasing the dissolved oxygen. b. neutralizing the PH. c. oxidizing sulfide compounds.
sulfide compounds. Construction of a wastewater pipeline under a highway or railway without disrupting the traffic is done by? a. Drag lining. b. Dredging. c. Embankment excavation.
When a grade conflict exists between a water main and a sewer main, which of the following is the best solution? a. Build a manhole around the sewer main and continue the water main through the manhole. b. Drop the sewer service under the water main and let it work like a siphon. c. Have the water main adjusted and hold the grade on the sewer main. d. Raise the sewer over the water main and install a sewer pump station. -
the sewer main. The reason newly constructed collection system sewers should be inspected is to: a. determine if the contractor has complied with plans and specifications. b. determine if smoke tests will be successful.
Repairs to manholes include: a. adjusting the alignment. b. correcting cavitation damages. c. raising frame and cover to grade.
grade. Liners are installed in sewers to correct problems caused by: a. grade alignment. b. grease. c. grit.
A kilowatt is the equivalent of: a. 0.67 amperes at a voltage of 120. b. 1.34 horsepower. c. 746 watts.
What factors should be considered when providing trench shoring? a. Grade of sewer. b. Pipe material. c. Structures or sources of vibration near trenches.
near trenches. When sewer line grades are too flat, an odor problem is likely to result. The most likely cause of the odor problem is decreased velocity which: a. allows decomposable solids to settle. b. decreases the treatment time in the lines. c. increases the treatment time of inorganic solids.
decomposable solids to settle. After a collection system problem has been solved, you should: a. wait until next week to fill out the report forms. b. take a break. c. go home.
the effectiveness of the results. Improper connections can be detected through: a. DO tests.
b. soundings. c. TV inspection.
Which of these pH readings indicates an acidic wastewater? a. 3 b. 12 c. 7
The record log of hydraulic cleaning operation should include: a. type and amount of material removed from downstream manhole. b. feet of rod used. c. camera malfunctions.
To test for pipe deflection and joint offset, you would conduct which of the following tests? a. Smoke. b. Air. c. Mandrill.
While the CCTC is being pulled through the line, the: a. camera must never stop. b. camera should be forced through any obstruction. c. operator must never stop looking at the monitor.
If the camera becomes wedged during a video inspection, which of the following would be your first step in solving the problem? a. Dig up the area where the camera is wedged. b. Attempt to free the camera with the tag line. c. Attach pull cable to a backhoe and pull is out.
A Category 1 SSO is: a. any volume reaching surface waters. b. any volume entering a storm drain and not recovered. c. any spill greater than 1000 gallons.
In a 25 MPH zone, Distance of Flagger Station in Advance of the Work Space should be: a. 155 feet
a. Piston b. Ejector c. Centrifugal
Vibrations in pumps may be caused by improper motor-pump: a. alignment. b. curves. c. piping.
What type of pump is not seriously damaged if the discharge valve is closed for a short time while the pump is running? a. Centrifugal pump. b. Diaphragm pump. c. Piston pump.
A mechanical ventilation system in a lift station wet well should be able to exchange the air in the wet well how many times an hour? a. 10 b. 20 c. 30
A pump is pumping less than its expected rate of discharge. What could be the cause? a. Speed of motor too high. b. Pump is primed. c. Impeller clogged.
A maintenance budget: a. is not concerned with capitol replacement. b. does not consider equipment-operating conditions. c. must be justifiable.
Which of the following governs employee behavior? a. Unions b. Rules prepared by the manager c. The grapevine
A good manager:
a. sets goals. b. waits for an emergency to happen. c. resists changes.
Planning which covers a period of five to fifteen years is called: a. scheduling. b. long range. c. updating.
The main purpose of a policy is to: a. explain how higher management wants work done. b. excuse managers from making decisions. c. provide guidelines for not making decisions.
Performance appraisal forms: a. should not be discussed with the employee. b. make the employee evaluation process consistent. c. should not contain a rating scale.
Who develops Material Safety Data sheets? a. Management b. Manufacturer c. Salesman
Responsibilities of supervisors and managers for a safety program include: a. not providing a written safety policy. b. never provide safety training. c. identify and correct unsafe work practices.
What is the intent of the OSHA regulations? a. To provide adequate staffing. b. To put managers in jail. c. To provide a safe work environment.
What are the four major types of records a utility must maintain? a. Equipment/maintenance, operations, procurement/inventory, personal. b. Equipment/maintenance, operations, procurement/inventory, personnel.
a. Age b. Education level c. Minority classification
The best way to record all work is done through a: a. closed circuit TV. b. Polaroid system. c. tape recorder.
The most important function of record keeping is: a. record how much money was budgeted and how much was spent. b. record the past and provide a sound basis on which to plan the future. c. record what was done and when it was done. d. record where the company has been, and how they got where they are today. -
What should financial management provide for a collection system? a. Capital improvement funds, careful budgeting, financial stability. b. Careful budgeting, financial stability, prudent investment of financial reserves. c. Careful budgeting, financial stability, lowest possible bond rates. d. Lowest possible bond rates, financial stability, capital improvement funds. -
An organization chart for a utility can be helpful for several reasons. Which of the following is the least valid objective of an organization chart? a. To establish proper chain of command authority. b. To help develop a budget. c. To help in making up project schedules.