Building Tech Board Exam 1999

A finishing mason is a highly-skilled laborer who is trained in various tasks such as preparing rough to finish plastering, laying concrete hollow blocks, laying brickwork, installing tiles, marble, synthetic granite, and similar work, as well as laying and finishing rubble, ashlar stonework, and pebble washout. This answer accurately describes the role and responsibilities of a finishing mason in construction and masonry work.

A wood lathe machine or "torno" is the correct answer because it is specifically designed to shape wood into different mouldings. It allows for precise and intricate designs to be created on balusters and newel posts. A jig saw is used for cutting curves and irregular shapes, a planer is used for smoothing and flattening wood surfaces, and a band saw is used for cutting straight lines and curves in wood. None of these options are specifically designed for creating wood mouldings like a wood lathe machine.

A vision door is a type of door commonly used between a kitchen and dining room to allow a server to see through. This type of door typically has glass panels or windows, allowing visibility between the two rooms. It enables the server to easily monitor the dining area while working in the kitchen.

The standard weight of a 25 mm diameter hot-rolled weldable deformed or plain steel bar per meter length is 3.853 kilos.

The correct answer is C. modular system. This is because the system described in the question involves the prefabrication of cabinets and furniture, which suggests that the components are made in a modular way and can be easily assembled or disassembled. This system is gaining popularity due to its efficiency in terms of time and quality, making it a suitable choice for builders and homeowners who prioritize these factors.

The given description states that the decorative coating is prepared to penetrate deep into unfinished wood and emphasizes the grain while bringing out the natural beauty of the wood. This suggests that the coating is designed to enhance the appearance of the wood by adding color and highlighting its natural features. The best option that fits this description is A. Oil wood stain, as oil stains are known for their ability to penetrate the wood and enhance its natural beauty.

The correct answer is B. 3/16” x 1/2” aluminum blind rivets. Blind rivets are a type of fastener that can be used for installation in this context. They are commonly used in construction and assembly applications, providing a secure and reliable connection. The aluminum material is lightweight and corrosion-resistant, making it suitable for use in ceiling cladding. The specified size of the rivets (3/16” x 1/2”) indicates the diameter and length of the rivets, ensuring a proper fit for the assembly.

The standard weight of a 16mm diameter hot-rolled weldable deformed or plain steel bar per meter length is 1.578 kilos.

The correct answer is A. 6mm diameter steel reinforcement. This is because the question states that glass block reinforcements are used in location no. 4, and the most inexpensive option for reinforcement is 6mm diameter steel reinforcement. The other options, such as schedule 20 SS pipe, #10 4” x 4” welded wire, and #16 expanded metal lath, may be more expensive or not suitable for this specific construction.

The correct answer is A. Seam lock. This is the method of joint commonly recommended by manufacturers of steel decks such as Condeck, Chuayuco, and Jacinto. Seam lock refers to joining the steel deck profiles side by side in a way that ensures a water-tight seal.

Blind and stub is the correct answer because it describes a type of mortise and tenon wood construction joint where the tongue and groove meet halfway, resulting in a clean connection without any visible join traces. This joint is called blind because one side of the joint is hidden or "blind" within the other piece, and it is called stub because the tenon is shorter than the mortise, leaving a visible "stub" on one side.

Post-tensioning is a method of introducing a jacking force in which tendons are tensioned after the concrete has hardened enough to sustain this force. In this method, the tendons are placed in the concrete before it is poured, and once the concrete has hardened, the tendons are tensioned using jacks or hydraulic systems. This helps to improve the structural performance of the concrete by increasing its strength and reducing cracking. Post-tensioning is commonly used in the construction of bridges, parking structures, and high-rise buildings.

The given description mentions using pure cement mixed with a synthetic latex-based additive to create a masonry finish. This finish is applied using an applicator roller to give a remarkable texture. The optional painting may be required to enhance its aesthetics. Therefore, the correct answer is A. Cement textured finish.

The correct answer is A because it states that course aggregates should be no larger than 1/3 the depth of the slab under consideration. This is important because using larger aggregates can lead to honeycombing or voids in the concrete, which can weaken the structure. By limiting the size of the aggregates, the concrete can be easily poured and consolidated without these issues.

A screw with an expansion plug is a suitable method for fastening aluminum jambs to concrete or masonry because the expansion plug provides a secure anchor point in the concrete or masonry, ensuring that the jambs are firmly attached. This method is commonly used when a strong and reliable fastening solution is required. Concrete nails may not provide enough stability, concrete screws are designed for fastening wood to concrete, and Teks screws are primarily used for fastening metal to metal, making them less suitable for this specific application.

The correct answer is C. Piedra. The reason why Piedra is not a brand of ceramic tile is because "Piedra" is the Spanish word for "stone" and not a specific brand. The other options, First Lepanto, Fil Hispano, and Euro, are all recognizable brands in the ceramic tile industry.

The explanation for the correct answer, C. washing, is that this paint defect occurs on inferior brands where the paint contains soluble pigments. When the paint dries sufficiently, it softens and dissolves when exposed to water or chemicals. This defect is commonly observed when attempting to clean or wash the painted surface, causing the paint to come off or fade.

The correct answer is B. Corduroy or tool finish. This is because the description provided mentions the use of a chamfered wood block as a form, which is a tool used to create the design lines. Additionally, texture is added using a chisel, which is another tool. The term "corduroy" is often used to describe a finish that has parallel lines or ridges, similar to the texture of corduroy fabric. Therefore, the corduroy or tool finish is the most appropriate explanation for the given description.

The given question is asking for a system of measurement that utilizes a modular system of construction and technology. The correct answer is B. Modular scale. A modular scale is a system that uses consistent intervals or ratios to create a harmonious and balanced layout or design. It is commonly used in graphic design, architecture, and other creative fields to ensure visual coherence and proportionality.

The correct answer is c. Main/cross tee and wall angle suspension. This is because the main/cross tee and wall angle suspension system is used to hang lightweight boards such as fiberglass boards, acoustic boards, and cork boards. It is commonly used for institutional use and can also be used for residential use if properly designed. The other options, channel runners suspension system, channel hangers suspension system, and angle hangers suspension system, do not accurately describe the type of suspension system used for wood ceiling joist substitutes.

A dead bolt lock is a type of handless lockset key-operated to give double security. Unlike other types of locks, a dead bolt lock does not have a spring mechanism and cannot be easily picked or forced open. It is operated by turning a key or thumb turn, which moves a solid metal bolt into the door frame, providing additional security. This type of lock is commonly used on exterior doors to prevent unauthorized entry and is known for its strength and durability.

The correct answer is A. crystalliser. A crystalliser is a chemical agent that is used to make a marble floor shiny without the use of wax. It is applied to the floor and then sprayed and buffed with steel wool until the surface becomes smooth and shiny. This process helps to create a crystalline layer on the surface of the marble, giving it a glossy appearance.

The tie rod system of a steel scaffold requires various parts to work effectively. The thrust plate is used to distribute the load and provide stability. The swivel pipe clamp is used to connect and secure the scaffold pipes. The bolt and wing nut are used to tighten and secure the tie rod system. However, a pin valve does not comprise the tie rod system. It is not necessary for the functioning of the system and serves a different purpose.

Laminated glass is the correct answer because it is a type of glass that is specifically designed to be shatter-proof. It is constructed by sandwiching a layer of polyvinyl butyral (PVB) between two layers of glass. This PVB layer acts as a bonding agent and holds the glass together even when it breaks, preventing it from shattering into dangerous shards. This makes laminated glass a safe choice for constructing vision doors, as it reduces the risk of accidents caused by broken glass.

The correct answer is A. plyboard. Plyboard is a type of engineered wood made from waste wood boards that are compressed, finished with a thin layer of wood on both sides, and glued together with industrial glues. This description matches the process and characteristics of plyboard. Plywood, gypsum boards, and medium density fiber boards do not involve the same process of compressing waste wood boards and finishing them with a thin layer of wood.

Bleeding refers to a paint defect where the soluble color in the underlying surface causes discoloration in the coat. This means that the color from the surface is seeping through the paint, resulting in an uneven and discolored appearance. Spotting, blistering, and deadening do not specifically refer to this type of defect, making them incorrect choices.

The correct answer is A. Spandeck T -floor system. This is because the passage describes a new construction technology that offers a cost-effective, fast installation, lightweight, and strong floor system. The system utilizes prefabricated load-bearing floor segments, filler blocks or collapsible forms, welded wire, and concrete topping. The passage also mentions that this system is manufactured by Jackbilt and is now available in the Philippine market under a patented trade name.

Polymer is the correct answer because it is a substance that can be added to the hardener mixture to create a strong and durable material. When mixed with marble dust, the polymer forms a paste-like consistency that can be used to fill in the gaps between marble slabs during installation. This helps to create a seamless and smooth finish for the floor or wall. Caulking, tile grout, and concrete tile adhesive are not the correct answers because they do not accurately describe the mixture of hardener and marble dust.

A stressing anchor in post-tensioning comprises shims, bearing plate, stressing washer, and button head. These components are essential for the proper tensioning and anchoring of the wires in the concrete floor system. The shims help in adjusting the height and position of the anchor, while the bearing plate provides a stable surface for the tensioning force. The stressing washer is used to distribute the force evenly, and the button head is used to hold everything in place. This combination of components ensures the effectiveness and reliability of the post-tensioning system.

A squared splice is a type of wood end joint that is best suited for joints requiring tensile strength. In this joint, the ends of two pieces of wood are cut at a 90-degree angle and then joined together. This creates a strong and sturdy joint that can withstand pulling or stretching forces. The squared splice is commonly used in structural applications where strength and durability are important, such as in building construction or furniture making.

A bench mark is a reference point used to determine the vertical location of a ground surface with respect to vertical height. It is commonly used in surveying and construction to establish the elevation of a particular point. Bench marks are typically permanent markers or points on a structure that are accurately measured and recorded, allowing for consistent and reliable measurements of vertical height.

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The correct answer is A. Ridge end tile. This can be identified by the mark number 3 in the figure. The ridge end tile is used to finish off the end of the ridge line on a roof. It is typically shaped differently from the other tiles and is placed at the edge of the roof to provide a clean and finished look.

The correct answer is D. mortise lockset. The passage states that the door lock shown in drawing 1, 2, and 6 are vital security features. It also mentions that door locks come in many designs and mechanisms. Based on this information, it can be inferred that the safest door lock, recommended for main entry doors, would be the mortise lockset. This type of lockset is known for its durability and strength, making it a reliable choice for security purposes.

The correct answer is C because using pressure sensitive aluminized duct tape is the most effective way to ensure that no air gap is left between the air duct and the insulation. This type of tape creates a strong and secure seal, preventing any air leakage. Strapping the tape at 600 mm centers also ensures that it is evenly distributed and provides consistent coverage along the entire duct.

The recommended method by manufacturers to join the steel deck and the rebars is welding. Welding provides a secure and strong connection between the steel deck and the rebars, ensuring structural integrity. It allows for a continuous and permanent bond between the two components, making it a reliable method for joining them. Seam locking, tie with #16 tie wires, and riveting may not provide the same level of strength and durability as welding, which is why it is the recommended method.

The correct answer is C. 3/8” thick cement tile adhesive. Brick plaqueta is installed onto a scratch coat of a masonry wall using cement tile adhesive. This adhesive is typically applied in a thickness of 3/8". Cement tile adhesive is a strong and durable adhesive that is specifically designed for bonding tiles to surfaces. It provides a secure and long-lasting bond between the brick plaqueta and the masonry wall. The even distribution of the adhesive ensures that the brick plaqueta is properly adhered to the wall, creating a stable and aesthetically pleasing installation.

The correct answer is D. Hue scale. The Munsell color principle states that colors can be described in terms of three attributes: hue, value, and chroma. Hue refers to the specific color family or wavelength of light, and it is the primary factor that determines the overall appearance of a color. In the case of orange, which is a secondary color, it is created by mixing red and yellow. However, because of its position on the hue scale, orange tends to have a yellowish quality to it.

A scarf joint is a type of wood end joint where both pieces of wood are cut at equal angles diagonally. This type of joint is commonly used in woodworking to join two pieces of wood end-to-end, creating a longer piece of wood. The angled cuts create a larger surface area for the glue to bond the two pieces together, resulting in a strong and durable joint. Scarf joints are often used in applications such as boatbuilding, furniture making, and structural framing.

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The correct answer is B. value scale. The Munsell color principle is based on the concept of value, which refers to the lightness or darkness of a color. The value scale is used to determine the degree of colorfulness or intensity of a color. This scale allows for accurate color reproduction and production in construction techniques.

The correct answer is C because using pure cement with a flexible synthetic mortar additive ensures a strong and durable bond between the Piedra tiles and the mortar bed. The flexible synthetic mortar additive helps to improve the flexibility and adhesive properties of the mortar, allowing it to better accommodate any movement or shifting in the tiles. This helps to prevent cracking or loosening of the tiles over time. Additionally, using a uniform 10mm thickness ensures an even and consistent layer of mortar for proper installation of the tiles.

A flat bar is a type of steel window section that is commonly used for muntins. Muntins are the vertical or horizontal bars that divide a window into smaller panes. Flat bars are rectangular in shape and provide a clean and simple aesthetic for window designs. They are often used in traditional or modern window styles and can be easily customized to fit different window sizes and configurations.

The correct answer is B. heptagon. A heptagon is a seven-sided polygon and is not a wood parquet geometric design. Wood parquet designs typically consist of repetitive patterns and shapes, such as squares, rectangles, triangles, or circles. A heptagon does not fit into this category and is therefore not a wood parquet geometric design.

The correct accessory in drawing no. 1 is the trust plate.

The correct answer is C. Corner return block. In the given figure, block mark no. 3 is a corner return block. This type of block is specifically designed to be used in the corners of the construction. It has a modularized shape that allows it to fit perfectly in the corner, providing stability and support to the structure.

Option B states that aluminum pipes and conduits at reinforced concrete should be secured at steel reinforcing bars by tie wires. This practice is not considered good construction practice because aluminum and steel have different expansion and contraction rates, which can lead to corrosion and damage to the pipes and conduits. It is recommended to use non-corrosive materials, such as PVC or stainless steel, for pipes and conduits embedded in concrete.

The question asks for the concealed door closer that may be used for fire doors. Looking at the drawings, No. 6 is the only one labeled as a concealed door closer. Therefore, No. 6 is the correct answer.

A ceramic tile from 4" to 18" in its widest dimension is relatively large and heavy. In order to securely install such a tile on a masonry wall over rough plaster, a thicker layer of cement plaster is needed to provide adequate support and ensure proper adhesion. A 3/4" layer of cement plaster will provide a strong and stable base for the tile, helping to prevent cracking or detachment. Cement grout (option B) is typically used for filling gaps between tiles, not for installing them. Cement mortar (option D) is generally used for bonding bricks or stones, not tiles. The use of pure cement with a flexible synthetic additive (option A) may not provide enough thickness or stability for larger tiles.

The best recommended insulation for the air-conditioning duct is a polyethylene foam with an aluminum foil vapor barrier. The polyethylene foam provides insulation and helps to reduce heat transfer, while the aluminum foil vapor barrier acts as a moisture barrier. The polyethylene foam is adhered to the galvanized duct using contact cement, ensuring proper adhesion and a secure installation.