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Planning & Estimating — California C-20 Practice Questions

50 questions · 22% of the C-20 HVAC Trade exam

Worked questions

2. A long line-set route includes large elevation change. What belongs in the estimate?

  • AExtra refrigerant only
  • Follow listed long-line requirements
  • CRemoval of all traps regardless of instructions
  • DStandard pipe size regardless of length

Why B is correct

Length and lift can affect pressure drop, oil return, allowable charge, capacity, and required accessories. The equipment manufacturer’s engineered limits and instructions control the final design.

46 more in the bank

Answers and explanations for these are in the app.

  • A building has high outdoor humidity and substantial ventilation air. What must equipment selection evaluate?
  • A commercial hood exhaust volume is increased. What must be coordinated?
  • A commercial occupancy changes from retail to a densely occupied assembly use. What must be recalculated?
  • A conference room is intermittently occupied. What control may reduce outdoor-air energy while maintaining requirements?
  • A contractor substitutes HVAC equipment after the energy documents are approved. What is the proper response?
  • A cooling unit is planned above a finished ceiling. What condensate scope should be coordinated?
  • A heat-pump line set exceeds the standard length in the installation manual. What should the estimate include?
  • A house has a correct block load but no room-by-room load calculation. What design task remains?
  • A new furnace is added at the end of an existing gas system. What must be checked?
  • A replacement furnace has a different input rating from the existing unit. What must be verified before pricing a simple equipment swap?
  • A replacement heat pump is being selected for a home. Is floor area alone enough to select its capacity?
  • A single-zone unit is proposed for areas with very different schedules and loads. What should be evaluated?
  • Airflow is 1,000 cfm and enthalpy decreases by 6 Btu per pound. Using 4.5, what total capacity is transferred?
  • Airflow is 1,000 cfm and the supplied sensible-heat factor is 1.08. With a 20°F air-temperature change, what sensible capacity is transferred?
  • Airflow is 800 cfm with a 15°F temperature change. Using 1.08, what sensible heat rate results?
  • An occupied replacement requires shutdowns, crane work, controls, testing, and temporary conditioning. What should the bid include?
  • An outdoor unit nameplate lists minimum circuit ampacity and maximum overcurrent protection. How should the electrical scope be estimated?
  • How should available static pressure be used in duct design?
  • Room loads are complete, but the estimator sizes every branch duct by room floor area. What important work is missing?
  • The calculated sensible and latent loads are known. What should control selection of residential cooling equipment?
  • Why are both minimum circuit ampacity and maximum overcurrent protection needed?
  • A blower's available static pressure is known. How should the designer distribute that pressure across the air system?
  • A ceiling-mounted unit drains above network equipment. Which primary and backup protection should be included?
  • A contractor proposes replacing a three-ton residential unit with another three-ton unit without evaluating envelope changes. Is that like-for-like capacity assumption sufficient?
  • A design has only a whole-house load result. What must be calculated before supply airflow is assigned to individual rooms?
  • A heat-pump line set will be longer and higher than the standard installation table allows. What belongs in project planning?
  • A higher-input furnace replaces a smaller unit in an existing closet. Which connected systems and clearances require new verification?
  • A line set exceeds the manufacturer's standard length and lift. Which piping, charge, and oil-management provisions belong in the estimate?
  • A meeting room is empty most days but densely occupied for short events. Which permitted ventilation control may reduce unnecessary conditioning?
  • A new appliance is added to the far end of an existing fuel-gas network. Which sizing data must be reevaluated?
  • A restaurant becomes a high-occupancy event venue. Which ventilation quantities must be reevaluated before equipment selection?
  • A water loop carries 10 gpm through a 16°F drop. Using the supplied factor 500, what heat-transfer rate results?
  • Airflow is 1,200 cfm and enthalpy falls by 5 Btu per pound. Using 4.5, what total cooling rate results?
  • An air-conditioner nameplate shows two different electrical ratings for ampacity and overcurrent protection. How should the electrical allowance use them?
  • An air handler is located above archival storage. Which drainage and overflow provisions should be coordinated?
  • Approved compliance documents name one heat pump, but procurement proposes another model. What should happen before substitution?
  • Design sensible and latent loads are available for a coastal home. Which data should determine the selected equipment's actual capacity?
  • High outdoor-air volume enters a humid building. What two capacity components must equipment selection satisfy at design conditions?
  • Increasing commercial hood exhaust changes building pressure. Which companion air system must be coordinated?
  • No trade has accepted responsibility for a rooftop curb, flashing, crane, or structural attachment. What should the HVAC bidder do?
  • One constant-volume unit serves rooms with opposing schedules and loads. Which zoning and minimum-flow issues should be studied?
  • Replacing HVAC in an occupied clinic requires shutdowns, temporary cooling, controls, testing, and a crane. What should the bid contain?
  • Room airflow targets are known, but branch sizes were copied from a different house. What design analysis is missing?
  • Supply air is 900 cfm with a 14°F change. Using 1.08, what sensible heat-transfer rate results?
  • Supply airflow is 1,250 cfm with a 16°F temperature difference. Using the supplied 1.08 factor, what sensible heat transfer occurs?
  • Why does HVAC electrical coordination need both the marked minimum circuit ampacity and maximum overcurrent value?

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