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NCARB ARE 5.0 Project Development and Documentation Exam Sample Questions (Q33-Q38):
NEW QUESTION # 33
Which of the following is an advantage of using a glycol-cooled air conditioning unit for a computer room?
Answer: D
Explanation:
Glycol-cooled air conditioning systems use a glycol-water mixture as a secondary coolant instead of plain water. Glycol has lower freezing point and better heat transfer properties in certain conditions.
Advantages include:
Longer piping runs without freezing risk, allowing the chiller or cooling unit to be located further away from the computer room, useful for flexible building layouts.
Glycol prevents freezing in cold climates or exposed pipes.
It does not inherently reduce heat exhausted or is necessarily more sustainable than water cooling.
Glycol is generally more expensive than water.
Therefore, the primary advantage is the ability to locate the cooling unit farther from the space being cooled.
References:
NCARB ARE 5.0 Review Manual, Mechanical Systems chapter
HVAC system design manuals
ASHRAE guidelines on computer room cooling and chilled water systems
NEW QUESTION # 34
The single-line diagram for the electrical distribution system shown is for a multi-family project.
Click in the box on the single-line diagram where the transformer is located.
Answer:
Explanation:
Explanation:
The transformer is located in the first large box after the high-voltage primary feeders and before the secondary service conductors on the left side of the diagram.
Step-by-Step Reasoning
1. Understanding the diagram flow:
* The leftmost symbol represents high-voltage primary feeders from the utility (2,400V, 4,160V, 7,200 V, or 13,200V).
* Immediately after that, there is a large box labeled "Secondary Service conductors" with standard building service voltages (120/208, 120/240, 277/480 V).
* To get from primary (medium/high) voltage to these usable secondary voltages, you must step down the voltage - and that is done by a transformer.
2. Transformer location in electrical distribution:
* Transformers are always placed between the incoming primary service and the secondary distribution system in building diagrams.
* In this drawing, the transformer is symbolized by the first large square/rectangular box after the high- voltage primary feeders.
3. Why not any other box?
* The following boxes and lines after this first step are feeders, panels, and motor starters - they operate at secondary voltage.
* Only the transformer connects the utility high-voltage system to the building's lower-voltage system.
NCARB ARE 5.0 PDD References:
* Content Area: Electrical Systems - Service Entrance and Distribution
* Source References:
* MEEB (Mechanical and Electrical Equipment for Buildings) - Chapter on Transformers & Electrical Service
* NEC (National Electrical Code) Article 450 - Transformer Installation and Use
* Architectural Graphic Standards - Single-Line Diagrams for Electrical Distribution Key Point:
In building electrical distribution, the transformer is always between the high-voltage primary service and the secondary service conductors to step down voltage to a usable level for building loads.
NEW QUESTION # 35
Which species of wood is often used as a substitute for more costly species because of its hardness, grain pattern, and ability to take paint and stain well?
Answer: D
Explanation:
Poplar is a hardwood that is relatively inexpensive compared to species like maple, cherry, or oak. It has:
Good hardness and uniform grain
Takes paint and stain well (although stain may require pre-treatment for even color) Often used as a cost-effective substitute for higher-priced hardwoods in furniture, millwork, and trim.
Why not others:
Red oak: Hard and attractive but more costly.
Cypress: Softwood valued for decay resistance, not typically a hardwood substitute.
Redwood: Softwood, expensive, used for exterior decay resistance.
PDD Reference: ARE 5.0 PDD "Materials-Wood species characteristics," CSI Div. 06 Wood & Plastics, Architectural Woodwork Institute (AWI) standards.
NEW QUESTION # 36
In which of the following locations should wood building products be pressure treated when used in a climate that promotes decay? Check the four that apply.
Answer: B,C,D,E
Explanation:
The IBC and AWPA (American Wood Protection Association) standards require pressure treatment of wood in decay-prone climates when in contact with moisture-retaining materials (masonry/concrete), near grade, or within splash zones.
A: Moisture can wick from masonry/concrete into wood # decay risk.
B: Close proximity to soil promotes decay/insect activity.
D: Siding <6" above grade risks splashback and prolonged wetting.
E: Window casings <24" above grade are exposed to rain splash.
C: Roofing/flashing interface doesn't require PT unless actual contact with wet substrate is expected.
F: Doors with thresholds don't require PT unless the door bottom is wood in constant wetting.
PDD Reference: IBC §2304.11; ARE 5.0 PDD "Materials-Wood decay & termite resistance."
NEW QUESTION # 37
Refer to the exhibit.
What is an accurate description of the air distribution system shown?
Answer: B
Explanation:
The diagram shows a displacement ventilation system. In this system:
Cool supply air (about 65°F) is introduced at floor level at low velocity through floor diffusers.
Warm air rises as it picks up heat from occupants/equipment and stratifies near the ceiling, where it is returned or exhausted.
This creates a stratification layer with cooler, cleaner air in the occupied zone and warmer air above.
This is efficient for comfort, air quality, and energy use in spaces #12 ft high.
Why not other options:
A: This system uses a plenum return, not ducted supply and return for both.
C: It is efficient in summer since it uses warmer supply air and reduced fan energy.
D: Individual comfort control is possible via diffuser location/adjustment.
PDD Reference: ARE 5.0 PDD "Mechanical Systems-Air distribution types," ASHRAE Fundamentals, displacement ventilation diagrams.
NEW QUESTION # 38
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