PDD Exam Dumps and Practice Questions

Verified Answer: C. Change 20,000 sq ft of stained concrete to VCT and substitute 10,000 sq ft of VCT for

Comprehensive Detailed Explanation with all NCARB ARE 5.0 Project Development and Documentation (PDD) Study Guide Reference:

Calculate savings for each option by comparing current costs to proposed changes.

Verified Answer: C. Change 20,000 sq ft of stained concrete to VCT and substitute 10,000 sq ft of VCT for

Comprehensive Detailed Explanation with all NCARB ARE 5.0 Project Development and Documentation (PDD) Study Guide Reference:

Calculate savings for each option by comparing current costs to proposed changes.

Check if this matches required savings:

No, it's less than $150,000. So let's check others briefly.

Options A and B will be less, so the answer should be D.

Summary:

Option D results in approximately $152,500 savings, meeting the $150,000 target.

NCARB ARE 5.0 Review Manual, Project Cost Control and Materials chapter

Construction cost estimating principles and value engineering strategies

Change 20,000 sf stained concrete ($6.00/sf) to VCT ($5.75/sf)

Savings per sf = $6.00 - $5.75 = $0.25

Total savings = 20,000 sf $0.25 = $5,000

Substitute 10,000 sf of VCT ($5.75/sf) for ceramic tile ($15.00/sf)

Savings per sf = $15.00 - $5.75 = $9.25

Total savings = 10,000 sf $9.25 = $92,500

Total savings = $5,000 + $92,500 = $97,500

Check if this matches required savings:

No, it's less than $150,000. So let's check others briefly.

Option D:

Change 25,000 sf stained concrete ($6.00/sf) to sealed concrete ($2.00/sf)

Savings per sf = $6.00 - $2.00 = $4.00

Total = 25,000 4.00 = $100,000

Substitute 30,000 sf vinyl plank ($7.00/sf) for carpet ($8.75/sf)

Savings per sf = $8.75 - $7.00 = $1.75

Total = 30,000 1.75 = $52,500

Total savings = $100,000 + $52,500 = $152,500 Meets and exceeds required savings

Options A and B will be less, so the answer should be D.

Summary:

Option D results in approximately $152,500 savings, meeting the $150,000 target.

NCARB ARE 5.0 Review Manual, Project Cost Control and Materials chapter

Construction cost estimating principles and value engineering strategies

Understanding the Diagram

The diagram shows a 480Y/277V three-phase, four-wire wye-connected system with a neutral (N) and system ground.

480 V = Voltage between any two phase conductors (line-to-line)

277 V = Voltage between any one phase conductor and neutral (line-to-neutral)

Fluorescent Lighting Voltage Requirements

Standard commercial fluorescent lighting systems are typically designed for 277 V operation in the U.S. (in buildings with a 480Y/277V system).

To achieve 277 V, you connect one phase conductor (A, B, or C) to Neutral (N).

This is a single-phase line-to-neutral connection.

Which Conductors to Use?

In the given options, the correct pair must give 277 V.

C, N 277 V line-to-neutral Correct for fluorescent lighting.

Other options produce different results:

A, B = 480 V (line-to-line) --- too high for fluorescent ballasts.

C, A, B = all three phases --- used for three-phase loads, not lighting.

C, A, N --- would give two circuits, but includes extra phase unnecessarily for single-phase lighting.

NCARB ARE 5.0 PDD Study Guide Reference:

Content Area: Electrical Systems --- Power Distribution and Circuiting for Lighting

Source Reference:

Electrical Systems for Architects --- Fluorescent lighting voltage selection

MEEB (Mechanical and Electrical Equipment for Buildings) --- Chapter on Electrical Service and Lighting Systems

NEC (National Electrical Code) --- Voltage to ground for wye-connected systems

Key Point: For a 480Y/277V wye system, fluorescent lighting should be connected from any phase to neutral for 277 V operation.

A thermal break in metal window frames interrupts the conductive path of heat through the frame, reducing heat transfer.

This reduces the chance that the interior surface of the frame will drop below the dew point temperature, thereby reducing condensation (surface moisture buildup).

Thermal breaks do not increase air infiltration; they help maintain thermal performance.

They reduce sound transmission, so B is incorrect.

Thermal breaks typically increase cost and complexity, so D is incorrect.

NCARB ARE 5.0 Review Manual, Building Enclosure and Materials chapters

Fenestration performance and condensation control guides

1. Problem Summary

Goal: Reduce reverberation time (RT) in the Tap Room to 2.0 seconds or less.

Current design: 2' x 2' acoustic ceiling tile system (RT = 2.0 seconds) installed above fans.

Constraint: Minimize additional project cost.

Recommendation from acoustical engineer: Use materials to achieve target RT without redesigning the space.

2. Review of Table Data

Material RT SF SF Cost

Cementitious Wood Fiber Panels (1') 2.0 448 $12.64

Cementitious Wood Fiber Panels (2') 1.8 384 $18.95

2x2 Acoustical Ceiling Tile (15/16') 2.0 900 $8.81

Acoustical Sound Board (1') 1.6 256 $18.23

3. Interpretation of RT Values

Current 2x2 Acoustic Ceiling Tile: RT = 2.0 seconds meets the target exactly.

However, fans may reduce the acoustic performance by reflecting or scattering sound, so supplemental absorption may be needed.

Adding Acoustical Sound Board (RT = 1.6) above the existing tile system will improve absorption and lower RT below 2.0 seconds.

4. Cost & Constructability

Retaining the current ceiling layout and simply adding a layer above is:

Least disruptive to current design.

Avoids redesign of the ceiling cloud layout.

Minimizes schedule impact (critical for design-build with compressed schedule).

Replacing with wood fiber panels (1' or 2') would require removal of existing tile, redesign of suspension, and higher cost/SF.

5. Why Other Options Are Incorrect

A . Remove fans: This addresses air movement, not RT. Removing them does not guarantee RT improvement and conflicts with HVAC design intent.

B . One cloud + 1' wood fiber panels: Reduces coverage area and may not meet RT goal; also costly and disruptive.

C . One cloud + 2' wood fiber panels: Even more costly, same redesign problem as B.

D . Retain tiles and add sound board above: Achieves RT < 2.0, minimal disruption, cost-effective vs. full replacement best option.

6. NCARB ARE 5.0 PDD Study Guide Reference

Content Area: Building Systems Integration --- Acoustics

Reference Sources:

Architectural Graphic Standards --- Acoustic material properties

Mechanical and Electrical Equipment for Buildings (MEEB) --- Room acoustics and reverberation control

ASTM C423 --- Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method

Where no public sewer is available, on-site wastewater treatment (septic tank + leach field) is required. This supports Objective 3.2, considering utility systems and site limitations.