Free USGBC LEED-AP-BD+C Practice Exam with Questions & Answers | Set: 6

Achieving a minimum of 10 cooling tower cycles by increasing the level of make-up water treatment is the way to obtain the maximum number of points for Water Efficiency Credit, Cooling Tower Water Use. This credit aims to conserve water used for cooling tower equipment by encouraging the use of non-potable water sources and increasing the cycles of concentration 1 . The cycles of concentration are the ratio of the concentration of dissolved solids in the blowdown water to the concentration of dissolved solids in the make-up water 2 . Increasing the cycles of concentration reduces the amount of make-up water and blowdown water, and thus saves water and energy 2 . The credit has two options: Option 1. Non-potable Water Source (1 point) and Option 2. Cooling Tower Water Use (2 points). Option 1 requires using at least 50% non-potable water for cooling tower make-up water 1 . Option 2 requires achieving a minimum number of cooling tower cycles based on the quality of the make-up water, as specified in Table 1 of the credit requirements 1 . The maximum number of cycles is 10, which can be achieved by increasing the level of make-up water treatment to meet the criteria for conductivity, silica, and alkalinity 1 . Therefore, Option 2 is the way to obtain the maximum number of points for this credit. References :

Credit: Cooling tower water use | U.S. Green Building Council

Cooling Tower Evaporation Credits | WaterSignal

the local equivalent standard is more stringent than ASTM E1527-05

According to the LEED V5 Reference Guide for Building Design and Construction, a Phase I ESA is required for all projects, except for those located on previously developed land that has not been used for industrial, commercial, or agricultural purposes. The Phase I ESA must follow the ASTM E1527-05 standard or a local equivalent. However, if the local equivalent is more stringent than the ASTM standard, then the project must comply with the local equivalent. Therefore, if the new building project is located in a jurisdiction that has a more rigorous standard for Phase I ESA than ASTM E1527-05, then it must complete a new Phase I ESA, regardless of the previous ESA done for the certified facility.

For LEED BD+C Materials and Resources (MR) Credit: Building Product Disclosure and Optimization , teams must prioritize material selection based on environmental and sustainability attributes.

Including material requirements in project specifications ensures that all contractors, suppliers, and stakeholders follow the necessary sustainability criteria.

Selecting locally sourced materials (Option B) is beneficial, but it is not the primary focus of this credit.

Whole-building life-cycle analysis (Option C) is related to a different LEED credit (MR Credit: Whole-Building Life-Cycle Impact Reduction).

Procuring materials directly from raw suppliers (Option D) is not a LEED requirement and does not ensure compliance with disclosure and optimization requirements.

Option A is the correct choice because defining sustainability criteria in specifications helps ensure LEED-compliant materials are used throughout the project.

(Source: Official LEED BD+C Reference Manual)

The project should use LEED v5 BD+C: New Construction and Major Renovations. The work creates three complete new floors, installs dedicated mechanical systems, adds a mechanical penthouse, and requires structural demolition. This scope is substantially greater than an interior fit-out, so LEED for Commercial Interiors is inappropriate. Under the LEED v5 structure, healthcare buildings are evaluated through the applicable BD+C New Construction and Major Renovations framework rather than through a separately listed LEED for Healthcare rating system. Healthcare-specific operating characteristics must still be addressed when documenting energy, water, resilience, indoor environmental quality, and occupant-experience requirements. The New Construction and Major Renovations rating system is appropriate because the project involves significant new building area, structural alteration, and complete building-system installation.

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The Solar Reflectance Index (SRI) is a measure of the roof’s ability to reject solar heat, as shown by a small temperature rise. It is defined so that a standard black (reflectance 0.05, emittance 0.90) is 0 and a standard white (reflectance 0.80, emittance 0.90) is 100. SRI is calculated using the roof surface’s Solar Reflectance (SR) and Thermal Emittance (TE). SR is the fraction of solar energy that is reflected by the roof, and TE is the relative ability of the roof surface to radiate heat. Therefore, SRI includes the measure of a material’s ability to reflect solar radiation, but not its ability to absorb or emit thermal radiation.

Tidal-based electrical production is eligible for the Energy and Atmosphere Credit, Renewable Energy Production. This credit rewards projects that use renewable energy systems to offset building energy cost. According to the LEED V5 BD+C Reference Guide, renewable energy systems are defined as “those that use resources that are naturally replenished within a 100-year or shorter cycle and that are greenhouse gas neutral on an annual basis” 1 . Tidal-based electrical production meets this definition, as it uses the kinetic energy of the tides to generate electricity without emitting greenhouse gases. The other options are not eligible for this credit, as ground-source heat pumps are not considered renewable energy systems, municipal solid waste combustion is not greenhouse gas neutral, and passive solar and daylighting strategies do not offset building energy cost.

This option allows the project team to evaluate the impact of different window-to-wall ratios on the energy performance of the building, and to optimize the design accordingly. A simple box energy model is a preliminary analysis tool that can be used to compare different design alternatives and inform decision making in the early stages of the project12.

Increasing air speed can extend the acceptable thermal-comfort range in naturally conditioned spaces by increasing convective and evaporative heat loss from occupants. This can be achieved with ceiling fans, personal fans, operable windows, or other low-energy air-movement strategies. Occupants may remain comfortable at higher indoor temperatures when adequate air movement is available, reducing dependence on mechanical cooling. Radiant heating panels are primarily useful during heating conditions and do not address warm-weather comfort in naturally ventilated spaces. Low-emissivity windows reduce radiant heat transfer and solar-related loads, but they do not provide occupants with the immediate cooling sensation created by moving air. Increasing air speed is therefore the most direct strategy for improving warm-condition thermal comfort while maintaining low-energy operation.

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A pedestrian-oriented paving or turf area with physical site elements that accommodate outdoor social activities is necessary to satisfy the requirement for the outdoor space to be physically accessible when calculating the Sustainable Sites Credit, Open Space. This is because the outdoor space must be designed to encourage regular use by occupants and visitors1. A garden space dedicated to industrial food production for use by local communities may not be accessible to the building occupants and visitors2. A garden space with only one vegetation type and species during the summer for visual interest does not meet the requirement of having two or more types of vegetation or overhead vegetated canopy1. A dark paving area with site elements to encourage parking near wetlands or naturally designed ponds is not considered as pedestrian-oriented hardscape and may have negative impacts on the natural environment3.

For the Water Efficiency (WE) Prerequisite: Indoor Water Use Reduction , the kitchen sink is included in fixture calculations as it directly consumes water. The dishwasher must meet ENERGY STAR® standards or equivalent performance requirements to ensure water efficiency, though it is not included in the fixture calculations. The coffee machine, as a minor appliance with minimal water use, is not included in this prerequisite (B). This approach aligns with LEED’s focus on larger water-consuming fixtures while ensuring energy and water-efficient appliances where relevant.