NCARB PDD Practice Exam Questions & Answers

HVAC duct penetrations through fire/smoke rated assemblies require listed dampers and control/sensing to limit spread of flame and smoke.

Fire dampers (D) close on heat to maintain the fire-resistance rating of penetrated assemblies.

Smoke dampers (A) limit smoke migration in smoke partitions/barriers and in smoke control systems.

Air-handler shut-down sensors (F) (e.g., duct smoke detectors interfaced with the FA system) stop fans to prevent smoke distribution.

Not required: Balancing dampers (B) (for airflow only); Smoke barrier (C) (a wall/assembly requirement, not a duct device); Variable-volume smoke controls (E) (project-specific engineering, not a base requirement).

PDD refs: IBC Ch. 7 & 9; IMC 607 (dampers) & 606 (smoke detection in ducts); ARE 5.0 PDD---MEP/fire protection integration.

For light wood-frame buildings, the most economical way to develop lateral shear capacity---often without major structural alteration---is to add/upgrade wood structural panel (plywood/OSB) shear walls fastened to studs and plates per nailing schedules. This provides diaphragm and wallshear resistance with minimal added framing.

A . Moment connections in wood are labor-intensive and uncommon in light framing.

C . Horizontal board sheathing provides limited shear compared to plywood.

D . Gusset plates do not create a continuous shear diaphragm/wall.

PDD refs: AWC SDPWS (wood shear walls & diaphragms); ARE 5.0 PDD---Structural systems for lateral loads in light-frame construction; IBC Ch. 23.

Green roofing adds significant dead loads due to soil and water retention layers. Structural engineers must verify load-bearing capacity. This is tied to ARE Objective 3.2 on evaluating integration of building systems.

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

In concrete technology, admixtures are used to modify properties of fresh or hardened concrete:

Air-entraining agents: Introduce microscopic air bubbles to improve freeze-thaw resistance; they do not increase slump.

Water-reducing agents: Reduce water content while maintaining slump; increase workability but only moderately.

Calcium chloride: An accelerator, speeds up setting time; does not increase slump.

Superplasticizers (also called high-range water reducers): Significantly increase the slump (workability) of concrete without adding extra water, making the mix more flowable and easier to place.

Thus, to greatly increase slump while maintaining water-cement ratio, the superplasticizer is the correct choice.

Supporting Reference:

NCARB ARE 5.0 Review Manual, Materials and Assemblies section

Portland Cement Association publications on admixtures

ACI (American Concrete Institute) guidelines on admixtures

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.

In subsurface drainage system design:

The shape, size, and slope of drainage lines are selected primarily to achieve a desired flow velocity that prevents sedimentation and clogging but does not cause erosion.

Minimizing or maximizing flow is not the goal; the system must convey the design flow efficiently.

Velocity must be balanced --- too low leads to sediment build-up; too high causes pipe damage.

NCARB ARE 5.0 Review Manual, Site Design and Civil Engineering chapter

Drainage design principles from civil engineering manuals and EPA stormwater guidelines

Given:

The theater doubles its second-floor movie screens, increasing patron traffic.

Existing escalators are two 24-inch wide units, one up and one down, with simultaneous movie start times every 3 hours.

To handle increased traffic:

Increasing existing escalator speed to 130 fpm (option A) is limited by safety and code limits (typically max around 100 fpm); also increases wear.

Installing a new elevator (option B) is helpful for accessibility but does not efficiently handle high flow of large crowds during peak.

Installing a new escalator that reverses direction (option C) (also called a 'dance' or 'two-way' escalator) allows flexibility to accommodate peak traffic flow---e.g., two escalators up during rush times and one down, or vice versa.

Extending balustrades (option D) improves safety but does not increase capacity.

Therefore, option C is the best solution to manage increased passenger flow.

NCARB ARE 5.0 Review Manual, Environmental Systems and Building Services chapter

Vertical transportation design principles in public assembly spaces

ASME A17.1 Safety Code for Elevators and Escalators