Manufacturing Practices (BT-106) - Important Questions

Define "manufacturing" and explain the main objectives of manufacturing processes. Give two examples each of discrete and continuous manufacturing.

Classify manufacturing processes with a neat schematic diagram. Describe briefly the characteristics and one example of each major class.

Explain the importance of workshop safety. List common Personal Protective Equipment (PPE) used in a manufacturing workshop and state their specific protective functions.

Describe the construction and working principle of a vernier caliper. Explain how to read a measurement using a vernier caliper and define the least count. If one main scale division (MSD) is 1,mm and the vernier has 10 divisions, calculate the least count using the formula $LC = \frac{\text{MSD}}{N}$ and find the reading when main scale reads 12,mm and the 6th vernier division aligns with the main scale.

Explain the working principle and parts of a micrometer screw gauge. Define pitch and least count for a micrometer. If the pitch is 0.5,mm and the thimble has 50 divisions, compute the least count using $LC = \frac{\text{Pitch}}{N}$ and demonstrate how to read a measurement of 12.34,mm on such a micrometer.

Describe the purpose and use of the following marking and layout tools: surface plate, scriber, try square, center punch and marking gauge. Give one typical application for each.

Describe the types and uses of cutting and finishing hand tools commonly used in a fitting shop, with particular reference to chisels, hacksaw blades, and files. Explain selection criteria for a file for finishing a mild steel surface.

Write a step-by-step procedure to prepare a mild steel rectangular block (given dimensions) for drilling a 10,mm diameter hole at a specified location. Include marking-out, clamping, center punching, pilot drilling, drilling operation, and safety precautions.

Define the terms: tolerance, allowance and fit. Differentiate between clearance fit, transition fit and interference fit with one practical example each.

Explain the importance of earthing and overcurrent protection (fuse/MCB) for electric motors used in workshop machines. List two safe practices while operating electrically powered bench tools.