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Planning & Estimating — California C-36 Practice Questions

50 questions · 22% of the C-36 Plumbing Trade exam

Worked questions

5. A commercial appliance schedule lacks the required receptor for its indirect waste. What scope must be clarified?

  • AExclude all drainage without notice
  • Clarify receptor and drainage scope
  • CPrice only the visible sink
  • DConnect it to a floor drain later

Why B is correct

The best answer is: Clarify receptor and drainage scope. The missing receptor affects piping, venting, floor coordination, sanitation, and service access. A documented clarification establishes a code-compliant scope and prevents an unpriced field improvisation. The transferred field condition applies the same plumbing design, installation, service, or safety principle to a different project setting. The alternatives omit a prerequisite, conflict with the approved method, or fail to control the stated sanitation or physical hazard.

6. A long building drain changes direction several times behind permanent construction. What service provisions should the estimator include?

  • AA larger water heater
  • Required accessible cleanouts at applicable locations
  • CMore fixture traps
  • DAn air admittance device at every turn

Why B is correct

The best answer is: Required accessible cleanouts at applicable locations. Drainage systems need accessible maintenance points; traps and vent devices do not provide mechanical cleaning access. The best answer is therefore “Required accessible cleanouts at applicable locations.” The other choices either address a different system, rely on an unsafe shortcut, or make a conclusion not supported by the stated facts. The transferred field condition applies the same plumbing design, installation, service, or safety principle to a different project setting. The alternatives omit a prerequisite, conflict with the approved method, or fail to control the stated sanitation or physical hazard.

44 more in the bank

Answers and explanations for these are in the app.

  • A 180-gallon vessel fills at a steady 12 gallons per minute. Ignoring losses, how long does filling take?
  • A 32-foot horizontal drain is designed at 1/4 inch of fall per foot. What total fall is required?
  • A cylindrical vessel has a 4-foot inside diameter and is 5 feet long. Using 3.14 for pi and 7.48 gallons per cubic foot, approximately what is its capacity?
  • A documented cost subtotal is $8,000 and the stated pricing method adds 15% once. What price results?
  • A fitness facility has short periods of heavy shower use. What should drive water-heater and storage selection?
  • A fixture is 40 feet above the pressure-entry point. Using 0.433 psi per foot, what static pressure is lost to elevation?
  • A large building has long waits for hot water at remote fixtures. What should a recirculation design evaluate?
  • A planned pipe route has straight segments of 22 feet, 14 feet, and 9 feet. What developed straight-run length should be carried before fittings and waste?
  • A plumbing replacement expands into relocation of fixtures and structural penetrations. What belongs in the estimate before work proceeds?
  • A plumbing run measures 7.5 inches on a plan whose scale is 1/4 inch equals 1 foot. What real-world run length does the plan represent?
  • A remodel drawing and fixture schedule disagree about the number of plumbing fixtures. What should the estimator do before finalizing pipe sizes and price?
  • A specification proposes joining dissimilar metals in a corrosive location. What should the estimator include?
  • A takeoff lists pipe footage but omits fittings, hangers, testing, and access constraints. What is the estimate missing?
  • A takeoff requires 420 feet of pipe. The estimate carries 8% for cuts and field allowance. What quantity results before purchase-length rounding?
  • A tenant improvement adds fixtures to an existing drainage branch. What must be checked before connecting them?
  • A three-person crew is scheduled for two 8-hour shifts. How many labor-hours should the estimate carry?
  • Before bidding a hospital shutdown, what investigation is most important?
  • Material costs $4,600 and the estimate includes 32 labor-hours at $85 per hour. What direct cost is carried before overhead and profit?
  • On a multifamily project during plan review, a concealed valve requiring future service is shown behind a tiled wall with no opening; what should the plan provide?
  • On a restaurant build-out during plan review, an estimator sizes a gas system using straight-line distance instead of the developed run; what is the risk?
  • On a retail shell project during plan review, structural drawings prohibit cutting a beam where the plumbing route is shown; what is the proper estimating response?
  • A 28-foot drain must fall 1/4 inch per foot. What total elevation change is required?
  • A chemical process can impose backpressure on a potable connection. What determines the protection level?
  • A concealed balancing valve will require periodic service after a stone wall is finished. What should the documents provide?
  • A fertilizer injector can pressurize a potable irrigation connection. How should the backflow method be selected?
  • A fixture is 55 feet above the service pressure reference. Using 0.433 psi per foot, how much static pressure is lost?
  • A fixture replacement promises water savings but may not perform with existing pressure and controls. Which planning check is needed?
  • A gas table is entered using the building width even though the most remote outlet follows a much longer routed path. What error can result?
  • A gym expects eight showers to run at 2 gallons per minute for a ten-minute peak. Ignoring recovery during that interval, what design draw results?
  • A hospital tie-in requires shutting down occupied patient areas. Which contingency and isolation facts should be verified before bidding?
  • A medical-office estimate counts fixtures but never converts them into probable water and drainage demand. Which sizing step remains?
  • A plumbing takeoff carries 120 base labor-hours. Congested access requires a 15% labor allowance. What total labor should be estimated?
  • A recirculation loop moves 2 gpm and returns 20°F cooler than supply. Using a supplied water-side factor of 500, what heat rate is lost?
  • A replacement expands into a coordinated alteration of walls, drains, and fixtures. What nonlabor scope belongs in the price?
  • A sanitary route collides with switchgear clearance and a concrete beam. What should coordination resolve before prefabrication?
  • A storage heater is installed downstream of a new check valve. Which closed-system pressure control should be evaluated?
  • A waste route crosses a structural member that cannot be bored as shown. What should happen before pricing and fabrication are finalized?
  • Dissimilar metals will meet in a corrosive equipment room. Which transition and corrosion measures belong in the estimate?
  • Fixture symbols and the written schedule show different quantities. What should the estimator reconcile before load calculations?
  • Fixtures operate intermittently rather than all at once. Which demand method should size the building water distribution?
  • Measured municipal pressure sometimes reaches 105 psi at a residence. Which control and downstream design issue belong in the plan?
  • New tenant fixtures will connect to an old branch. What should be evaluated besides nominal pipe diameter?
  • Several gas appliances share a branch with different input ratings and run lengths. Which data must enter the sizing table?
  • Static pressure looks adequate, but the most remote fixture fails during peak flow. Which pressure analysis is needed for sizing?

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