Workshop Technology Questions

• Oxy-acetylene welding — cylinder gas consumption for neutral flame In gas welding of mild steel with a neutral oxy-acetylene flame, if acetylene consumption from the cylinder is 10 litres, the approximate oxygen consumption from the cylinder will be:
• Sheet-metal operations — choosing the right term The operation of cutting a flat sheet to obtain the desired external shape (the cut-out is the product) is called:
• Metal spinning — primary deformation mode During conventional metal spinning of circular blanks over a mandrel, the principal mode of deformation is:
• TIG (GTAW) shielding gases In tungsten inert gas (TIG) arc welding, the weld zone is commonly shielded by:
• Cold working of metals — effect on size and structure Evaluate the statement: “Cold working distorts the grain structure and does not provide an appreciable reduction in size.”
• Hot piercing — typical applications Is hot piercing extensively used for making bolts and nuts in industrial practice?
• Hot Working of Metals — Choose the Correct Temperature Range In manufacturing metallurgy, “hot working” refers to plastic deformation performed relative to the material’s recrystallisation temperature. At which temperature range is hot working correctly carried out for metals?
• Foundry Practice — What Is a Swab Used For in Green Sand Moulding? During pattern withdrawal and mould finishing, which specific task is the swab intended to perform around edges and delicate features?
• Joining a Mild Steel Shank to a High-Speed Steel Drill — Select the Proper Resistance Welding Process In tool manufacture, what resistance welding method is commonly used to join a mild steel shank to a high-speed steel (HSS) drill body?
• Safety Identification — Standard Cylinder Color for Acetylene (Shop Practice) In workshop gas handling under typical Indian/ISO color practice, acetylene cylinders are usually painted which color for quick identification?
• Pattern Materials — Which Allowance Is Typically Smaller for Metal Patterns than for Wooden Patterns? Considering surface finish and strength of pattern materials, which allowance is generally required to be less when using metal patterns instead of wooden patterns?
• Master Pattern Allowance — Wooden Master for Casting an Aluminium Pattern (to be Used Later for Grey Iron) An aluminium pattern is to be produced by casting it from a wooden master pattern. What shrinkage allowance should be provided on the wooden master (considering the aluminium pattern casting step)?
• Moulding Machines — Characteristic of a Diaphragm Moulding Machine What sand hardness/packing profile is produced in a flask when using a diaphragm moulding machine with membrane pressure compaction?
• Metrology — Define “Tolerance” in Limits and Fits For a given dimension, what do we call the difference between the specified upper limit size and lower limit size?
• Casting Methods — Identify the Process: Gravity Filling of a Metallic Mould When molten metal is poured by gravity into a reusable metallic mould (without external pressure), which casting method is being used?
• Filing Techniques — Name the Method When the File Is Moved To and Fro Across the Work In bench fitting, what is the common term for the technique where the file is pushed forward and pulled back repeatedly over the job surface (across the width)?
• Rolling mills — configuration of a two-high stand In metal rolling practice, a two-high rolling mill uses two work rolls mounted one above the other. For such a mill, the two rolls are typically of what relative size?
• Oxy-fuel cutting of steel — when does the cut edge harden? During oxygen cutting (oxy-fuel), the cut edge of a steel plate can harden due to rapid heating and quenching. At approximately what carbon content does this edge-hardening become significant?
• Core making in foundry — which moulding sand is preferred for cores? In sand casting, separate core assemblies are used to form internal cavities. Which type of sand mix is commonly used specifically for making cores?
• Forging terminology — operation that reduces cross-section and increases length In smithy/forging practice, which operation specifically decreases the cross-section of a bar while increasing its length?