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Free C-36 Practice Questions: Planning and Estimating

60 free questions with answers, explanations and the official source for each. Answer one to see why. No sign-up.

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  1. 1 / 60

    A 3-inch horizontal drainage pipe runs 32 feet at the CPC 708.1 slope of 1/4 inch per foot. The starting elevation is 100 inches. What is the ending elevation?

  2. 2 / 60

    What is the profit margin if a job costs $12,000 and the selling price is $15,000?

  3. 3 / 60

    A vertical drainage stack will carry 450 fixture units. Under CPC Table 703.2, what is the first pipe size, going up from 4 inch, that can carry that load?

  4. 4 / 60

    A plumbing plan has a scale of 1/4" = 1'-0". A pipe run measures 3 inches on the drawing. What is the actual length?

  5. 5 / 60

    A flat roof measures 60 feet by 30 feet. What is the total drainage area?

  6. 6 / 60

    According to the CSLB Law and Business book, which of these is an overhead expense rather than a direct cost of a job?

  7. 7 / 60

    Under the CPC 202.1 definition, graywater includes wastewater from which of these?

  8. 8 / 60

    A public restroom has 7 water closets with flushometer valves. Using CPC Table 610.10, what accumulative fixture unit value is assigned to these water closets?

  9. 9 / 60

    An owner converts a retail store into a restaurant, a change in occupancy as defined in the building code. Under CPC Section 102.6, which requirements must the building's plumbing system meet?

  10. 10 / 60

    CPC Table 1215.2(1) gives capacities of Schedule 40 metallic pipe for natural gas at an inlet pressure of less than 2 psi. What pressure drop is the table based on?

  11. 11 / 60

    A 4-inch building drain runs 40 feet, and the AHJ has approved the reduced slope allowed by CPC 708.1. What is the minimum total fall?

  12. 12 / 60

    What is the conversion factor for a drawing marked 1/8\" = 1\'-0\"?

  13. 13 / 60

    A contractor estimates 200 feet of 3/4-inch copper pipe for a project. With a 15% waste factor, the order should be:

  14. 14 / 60

    A designer is sizing the hot water piping separately. Under the notes to CPC Table 610.3, what share of a fixture's listed total fixture unit value may be taken as its separate hot water value?

  15. 15 / 60

    A water heater manufacturer's installation instructions conflict with a provision of the plumbing code. Under CPC Section 102.1, which provision prevails?

  16. 16 / 60

    Under CPC Table 610.10, what accumulative fixture unit value is assigned to 3 urinals with flushometer valves?

  17. 17 / 60

    A 2 inch vent is the size CPC Table 703.2 requires for its load, and its total permitted length is 120 feet. Under CPC Section 904.2, how many feet of it may be installed in a horizontal position?

  18. 18 / 60

    According to the CSLB Law and Business book, labor costs in an estimate include the hourly wage rate plus what?

  19. 19 / 60

    The CPC conversion table in Section S 102.1 lists 1 foot of water (4°C) as 0.4335 pounds-force per square inch. How many feet of water does 1 psi represent, rounded to two decimals?

  20. 20 / 60

    What is the maximum flow rate for a residential lavatory faucet in California?

  21. 21 / 60

    Under CPC 420.2.1 (adopted by BSC-CG and DSA-SS), what is the maximum flow rate for a kitchen faucet at 60 psi?

  22. 22 / 60

    Under CPC Section 610.8 and Table 610.4, what is the minimum diameter of a building supply pipe?

  23. 23 / 60

    Circuit-vented horizontal branches are connected together. Under CPC Section 911.4.1, each group of how many fixtures, at most, is considered a separate circuit vent?

  24. 24 / 60

    A contractor starts a repipe without first obtaining the required permit. Under CPC Section 104.5.2, how much is the investigation fee that is collected in addition to the permit fee?

  25. 25 / 60

    A plumber sizes gas piping with the method in CPC Section 1215.1.1. Under that section, what sets the size of each section of gas piping?

  26. 26 / 60

    A 6 inch horizontal building storm drain is sloped at 1/8 inch per foot, and the design rainfall rate is 4 inches per hour. Under CPC Table 1103.2, what is the maximum allowable horizontal projected roof area it can serve?

  27. 27 / 60

    A contractor appeals an inspector's decision to the Board of Appeals and asks the board to waive a code requirement. Under CPC Section 107.2, can the board waive it?

  28. 28 / 60

    The required tests and inspections show that the plumbing work complies with the code. Under CPC Section 105.3.3, what shall the Authority Having Jurisdiction issue to the permittee on demand?

  29. 29 / 60

    Under CPC Section 420.3 and Table 420.3, what is the maximum flow rate of a Product Class 1 (5.0 ounces-force or less) commercial pre-rinse spray valve?

  30. 30 / 60

    A bathtub is being converted to a shower and the existing 1 1/2 inch trap and trap arm will be reused. Under note 9 to CPC Table 702.1, what is the maximum shower size allowed?

  31. 31 / 60

    Under CPC Section 102.1, a requirement within the jurisdiction of the plumbing code conflicts with a requirement of the mechanical code. Which one governs?

  32. 32 / 60

    An inspector serves a written notice ordering the work stopped because it is being done contrary to the code. Under CPC Section 106.4, what must the crew do?

  33. 33 / 60

    Under CPC Section 610.12.1, what is the maximum velocity allowed in a copper tube hot water system?

  34. 34 / 60

    A rectangular holding tank measures 5 feet by 4 feet by 3 feet inside. Using the unit conversion table in CPC Section S 102.1, how many U.S. gallons does it hold when full?

  35. 35 / 60

    An inspector needs to enter an occupied house to inspect for a code violation. Under CPC Section 103.4, what must the inspector do?

  36. 36 / 60

    What is the required slope for a 3-inch horizontal drain pipe?

  37. 37 / 60

    Under CPC Table 702.1, what is the minimum size trap and trap arm for a urinal with an exposed trap?

  38. 38 / 60

    A horizontal wet vent for a bathroom group receives 6 drainage fixture units. Under CPC Section 908.2.2, what is its minimum diameter?

  39. 39 / 60

    A valve detail is drawn at a scale of 1/2 inch = 1 foot. A pipe on the detail measures 5.5 inches. What is the actual length of the pipe?

  40. 40 / 60

    Under CPC Section 104.4.6, where must the set of approved construction documents returned to the applicant be kept while the permitted work is in progress?

  41. 41 / 60

    A gas line serves a furnace (120 cubic feet per hour) and a gas-fired cooling unit (90 cubic feet per hour), and the installation prevents both from running at the same time. Under CPC Section 1215.4, what demand is used to size that section?

  42. 42 / 60

    A 3 inch roof drain is sized for a design rainfall rate of 2.5 inches per hour, a rate CPC Table 1103.1 does not list. Using note 2 to the table, what roof area may it serve?

  43. 43 / 60

    Your direct labor cost is $2,000. To include overhead (20%) and profit (15%), what would your total bid be?

  44. 44 / 60

    A water softener and a tankless water heater will be installed in a building's water supply line. Under CPC Section 610.2, how is the pressure loss through these devices handled when sizing the system?

  45. 45 / 60

    Under CPC 610.3, the quantity of water required to be supplied to every plumbing fixture is represented by what?

  46. 46 / 60

    A house has two 1.6 GPF gravity-tank water closets. When the septic tank is sized under Appendix H, how many fixture units does note 6 to CPC Table 702.1 assign to each water closet?

  47. 47 / 60

    A contractor files a permit application, but no permit is issued. Under CPC Section 104.3.3, when does the application expire by limitation?

  48. 48 / 60

    A pipe offsets 30 inches using 45-degree fittings. Using the 45-degree constant of 1.414, what is the travel length?

  49. 49 / 60

    A school wash sink has 4 sets of faucets. Using CPC Table 702.1 public values, what is its DFU load?

  50. 50 / 60

    A fixture not listed in Table 702.1 discharges intermittently at a rated 20 gallons per minute. Under CPC Table 702.2, how many drainage fixture units is it?

  51. 51 / 60

    According to the CSLB Law and Business book, once all the costs of a bid (including overhead) have been totaled, what must the contractor add?

  52. 52 / 60

    A pressure-reducing valve is installed in the building supply. Under CPC Appendix A Section A 107.2, from where are the developed length and the permissible friction loss computed?

  53. 53 / 60

    A lavatory, a bar sink and a drinking fountain share one horizontal branch drain; their private DFU values from Table 702.1 total 2.5. Which is the first branch size in Table 703.2 that can carry that load?

  54. 54 / 60

    A 3/4 inch Schedule 40 natural gas line (0.5 in. w.c. pressure drop) serves a furnace at 100 cubic feet per hour and a water heater at 40 cubic feet per hour. The piping runs 30 feet from the meter to the most remote appliance. Under CPC Table 1215.2(1), is 3/4 inch large enough?

  55. 55 / 60

    Site condition change: the water main goes 3 feet deeper and 15 feet more horizontally. Material +$1,200, labor +$2,800. Original contract $42,000. Apply 18% overhead to labor only, then 12% profit to the total. What is the change order amount?

  56. 56 / 60

    A floor plan shows 30 feet of 2-inch copper supply pipe. With a 10% waste factor, what quantity should be ordered?

  57. 57 / 60

    Unless the Authority Having Jurisdiction requires otherwise, what design storm does CPC Section 1101.12.1 use to size primary roof drains, gutters, leaders and horizontal storm drains?

  58. 58 / 60

    During a remodel, a fixture is removed and its drain opening is left with nothing connected to it. Under CPC Section 102.4.2, what must be done with that opening into the drainage system?

  59. 59 / 60

    The pressure available for friction loss is 24 psi, and the developed length of pipe from the street main to the highest fixture is 160 feet. Under CPC Appendix A Section A 104.4, what is the average permissible friction loss per 100 feet of pipe?

  60. 60 / 60

    Water pressure at the street main is 70 psi. The highest fixture is at an elevation 50 feet above the main. Using CPC Appendix A 104.2, what is the static pressure at that fixture (ignoring friction)?

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