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68 Cards in this Set
- Front
- Back
1. When planning collection system construction, inform utility companies and locate their |
a. true
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2. In a plan and profile drawings, existing utility lines and sizes, trench depth and new |
b. false This is a trick question. it starts by referencing both plan and profile drawings... but ultimately is asking ONLY about the Plan View, Trench depth is only show on the profile drawings. |
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3. Shoring includes hydraulic or screw jacks with metal bracing, timber and wood sheeting and |
a. true
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4. Contractors working for a municipality are required by OSHA to shore. |
a. true
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5. Sloping or benching an excavation is an alternative to shoring. |
a. true
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6. Maximum allowable slope is expressed as the ratio of vertical rise to horizontal distance |
b. false Not (V:H) It's (H:V) Horizontal dist. to Verical rise is Maximum allowable slope |
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7. Type B soil may include angular gravel, silt, silt loam, and previously disturbed soils except |
a. true |
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8. The allowable slope for type B soil is 1:1. |
a. true
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9. Some considerations when selecting pipe includes exclusion of infiltration, external |
b. false Pipe Joint length is not related |
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10. Types of pipe include vitrified clay, concrete, asbestos cement, plastic and ductile iron. |
a. true |
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11. Vitrified clay pipe does not corrode, but root intrusion, cracking and infiltration are clay |
a. true
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12. To protect concrete pipe from hydrogen sulfide, PVC liners, epoxy, coal tar coatings, or |
a. true
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13. While cutting or tapping asbestos-cement pipe, keep the pipe wall wet to avoid breathing |
a. true
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14. Plastic pipe has rigid walls and does not depend on bedding for support and strength. |
b. false Plastic Pipe DOES depend on Bedding for support |
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15. PVC pipe wall thickness is classified as Standard Dimension Ratio (SDR). |
a. true |
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16. Prolonged exposure to hydrogen sulfide breaks down plastic pipe resins. |
b. false Plastic pipe will no corrode. |
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17. Ductile iron pipe is strong, but heavy and expensive. |
a. true
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18. When stringing pipe along the trench path, point the spigots away from the direction of |
b. false When Stringing Pipe, the Spigots should point IN the (same) direction of installation (water flow). Bells are up stream Spigots are down stream |
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19. If unloading pipe by hand, remove one piece at a time and do not stack pipe higher than 18 |
b. false Its 8ft NOT 18ft When unloading by hand, remove one at a time and do not stack higher than 8ft |
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20. Wastewater line grade must provide a velocity of at least 2 feet per second. |
a. true |
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21. Two systems are generally used to set grade: string and rod, or razor beam. |
b. false It's NOT RAZOR... it's LASER READ THE QUESTIONS WELL...
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22. There are two general pipe loads: trench load and surface load. |
a. true |
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23. The trench load decreases as the trench width, measured at the top of the pipe, increases. |
b. false Trench load INCREASES as the Trench width increases. |
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24. Trench width should be kept as narrow as possible, but the TCEQ requires trench width to |
a. true |
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25. Lay pipe with the spigot pointing upstream and the bell pointing in the direction of flow. |
b. false The Bell should point upstream The Spigot should point in the direction of flow (downstream) |
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26. Dig holes for the pipe bells so the barrel supports the pipe and do not lay pipe in water. |
a. true |
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27. After work, leave the pipe end open and backfill first thing in the morning. |
b. false After work SEAL the Pipe End and Backfill the Pipe as soon as possible or by the end of the day. |
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28. ________ is required when the trench bottom is unstable. |
b. Foundation
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29. TCEQ requires pipe bells to be off the trench floor at least ________ inches and have at |
c. 6
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30. Class A bedding for rigid pipe is achieved with the concrete ________ or ________. |
c. cradle/arch
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31. Class B and C bedding for rigid pipe uses crushed stone, shell, gravel or ________. |
d. sand
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32. No rocks larger than ________ inches should be in the final backfill within ________ feet of |
a. 6/3
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33. The amount of deflection of plastic pipe depends on ________. |
d. all listed
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34. Bedding material for plastic pipe includes ________. |
d. all listed
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35. Excessive trench load on plastic pipe requires pipe ________. |
a. casing
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36. Wastewater lines and manholes can be no closer to a water line than ________ feet. |
c. 9 |
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37. Parallel wastewater and water lines must be in ________ trenches. |
c. separate |
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38. Where wastewater lines or manholes cannot be separated from a water line by 9 feet, TCEQ |
c. four 1) New installed Parallel (separate Trench) 2) New is to cross 2 ft below and at a 75 -90 degree angle 3) If Not 2ft below or less than 75 degree angle or pipe length is less than 18ft... then a Minimum distance of 6" below...
But if Pipe and joins are not pressure rated to 150 psi... that MUST be placed withing 9 ft of the waterline in all directions AND embedded in cement stabilized Sand (10% cement mix per yard of sand)
4) If a manholes is to be less than 9ft, the water line MUST be encased in new encasement at least 18ft long, with a psi of 150 and a diameter at least TWO sizes larger than the waterline. |
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39. New ________ manholes are prohibited, and ________ cannot be used to adjust manhole |
a. brick/brick |
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40. Operators should wear a safety harness with lifeline when entering a manhole and at least |
b. two
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41. Ventilate by forcing ________ air into the manhole with a blower. |
c. fresh
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42. Test the manhole for ________ with approved instruments. |
a. gases
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43. Install manholes at a change in pipe alignment, change in grade, change in pipe ________, |
b. diameter
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44. Manhole covers for new manholes must be ________ inches or larger. |
c.24 (??old ??) But in the Book it says 30" So I say the answer is d. 30 |
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45. ________ are prohibited in new manholes. |
b. Steps
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46. Use a J-drop pipe if a wastewater line enters more than ________ inches above a manhole |
d. 30
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47. The soffit of a pipe is the pipe ________. |
d. crown
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48. A manhole fillet is a ________ invert. |
c. sloped
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49. The total infiltration or exfiltration of a new system cannot exceed ________ gallons per |
b. 50/24/2
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50. Prior to an infiltration test, allow the ground water level to stabilize for ________ hours. |
c. 24
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51. Prior to an exfiltration test by water, fill the ________ manhole ________ feet above the top |
d. upper/two/five |
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52. An exfiltration test by air requires that pipe less than ________ inch diameter be pressurized |
a. 36/3.5
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53. ________ psi loss within the time limit fails an exfiltration test by air. |
d. one
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54. Deflection tests must be performed on ________ pipe. |
c. plastic
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55. Pipe less than 27 inches in diameter must be tested with a ________ mandrel. |
d. rigid A mandrel's outside diameter must be equal to 95% of the indside diameter of the test pipe. Its made of Metal or Plastic It can withstand 200psi crush strength |
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56. Deflection testing is conducted only after the final backfill is in place ________ days. |
b. 30
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57. The mandrel cannot be pulled by a mechanical device and cannot exceed a ________ |
c. five
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58. The mandrel must have an outside diameter equal to ________ percent of the inside |
a. 95
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59. The mandrel barrel must have a length at least ________ percent of the test pipe diameter. |
b. 75
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60. Pressure systems are useful in circumstances such as________. |
d. all listed
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61. Pressure systems use submersible ________ pumps. |
a. centrifugal
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62. Multiple pump units are required for flow greater than ________ gallons per day. |
c. 1,500
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63. A visual and audio alarm is required for pressure system ________. |
b. wet wells
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64. Like a pressure system, a ________ system collects wastewater in a sump often located on |
a. vacuum
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65. When the sump is full a switch ________ a valve to a ________under vacuum and the |
d. opens/pipe/collection
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66. Vacuum pumps at collection points must empty the vacuum piping in ________ minute(s). |
c. three
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67. Duplicate vacuum pumps, each capable of ________% of specified airflow, are required. |
d. 100
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68. Alarms for ________ liquid level in the collection sump and ________ system vacuum are |
b. high/low |