Workshop Technology Questions

• Resistance spot welding — typical applications and thickness range Spot welding is primarily used to join overlapping sheet-metal parts (lap joints) within a practical thickness range. Choose the most appropriate statement.
• Directional solidification in castings To encourage metal to freeze progressively from the thin sections toward the riser, which combination of foundry aids is commonly employed?
• Gas tungsten arc welding (TIG/GTAW) — electrode type In tungsten-inert gas arc welding, the electrode used is best described as:
• Metals — billet size convention The statement 'The minimum size of a billet is 10 cm × 10 cm' is __________ with respect to standard metallurgical classifications of blooms, billets, and slabs.
• Hand tools — cold chisel material selection Cold chisels for chipping and cutting cold metal are typically manufactured from which material?
• Casting process selection — small decorative hollow items Which casting method is most suitable for producing hollow, thin-walled ornaments and toys from non-ferrous alloys?
• TIG (GTAW) of Magnesium — Choose the Correct DC Polarity In gas tungsten arc welding (TIG) of magnesium alloys, when direct current is selected, which polarity is commonly specified for stable arc and adequate penetration?
• Thermit Welding — Typical Industrial Applications Thermit (exothermic) welding is commonly employed for which of the following tasks in heavy fabrication and maintenance?
• Production of Structural Sections Which primary metalworking process is commonly used to manufacture structural shapes such as rails, angles, and I-beams?
• Gas Welding Setup — Acetylene Pressure at the Torch Select the typical acetylene pressure range desired at the welding torch for oxy-acetylene gas welding (shop practice values).
• Objectives of Mechanical Working of Metals Metalworking operations subject the metal to plastic deformation primarily to achieve which of the following outcomes?
• Die Casting Machines — Cold Chamber Configuration In a cold chamber die casting machine, which of the following statements is correct regarding the melting pot and machine layout?
• Casting of Gas Turbine Blades — Preferred Process For producing aerodynamically accurate, high-temperature-capable gas turbine blades, which casting process is most preferred?
• Foundry Sands — Name the Sand Dusted on Pattern Faces In moulding practice, which sand is sprinkled on the faces of the pattern before ramming the mould to prevent sticking and facilitate clean withdrawal?
• Casting Defects Near Ingates — Identify the Fault A surface defect occurring near ingates as rough, scabby lumps adhering to the casting is best identified as:
• Oxy-Fuel Equipment — Is the Cutting Torch the Same as a Welding Torch? State whether the torch used for oxygen cutting is the same as that used for oxy-acetylene welding.
• Foundry materials — composition of loam sand for large masonry-backed molds In traditional loam molding used for very large castings (e.g., bells, pipes, or architectural components), loam sand is a prepared mixture of sand and clay worked with water and organic binders. Which of the following approximate sand–clay proportions best represents standard loam used in foundries?
• Cold-chamber die casting — basic machine principle In a cold-chamber die casting machine, a measured ladleful of molten metal is transferred from the separate melting pot into the shot chamber and then forced into the closed die cavity by hydraulic pressure on the plunger. Is this description accurate?
• Sheet-metal operations — terminology for cutting a cylindrical hole In pressworking, what is the correct name of the operation in which a punch and die cut a cylindrical hole through the sheet, producing a discarded slug and a usable holed sheet?
• Primary mill products — minimum cross-section classified as a bloom In steel rolling terminology, which of the following minimum square sizes is generally classified as a bloom (as opposed to a billet or slab)?