Manufacturing And Production Technology MCQ Questions & Answers | Mechanical Engineering

The Diamond Shape is a critical feature that helps with machining inaccuracies and smoother locating operation. A diamond locating pin is used in jigs and fixtures because It helps in assembly with tolerance on centre distance

Burnishing is the plastic deformation of a surface due to sliding contact with another object. It smooths the surface and makes it shinier. In metal machining, the work-tool contact zone is a zone where heat is generated due to Burnishing friction

The snag grinding is doneTo remove considerable amount of metal without regard to accuracy of the finished surface

The most common application of spot facing (spot facing) is facing the area around a bolt hole where the bolt's head will sit, which is often done by cutting a shallow counter bore, just deep enough "to clean up"—that is, only enough material is removed to get down past any irregularity and thus make the surface flat.

Counter sinking is used to enlarge the upper part of (a cavity), especially by chamfering, to receive the cone-shaped head of a screw, bolt. The operation of making a cone-shaped enlargement of the end of a hole is known as Counter-sinking

Explanation:
The correct answer is Option B: Producing a large hole without drilling.

Let's break down why:
* Trepanning is a machining operation that cuts a circular groove to create a hole.
* Instead of removing all the material inside the hole like drilling, trepanning removes only a ring of material.
* This is especially useful for making large diameter holes where drilling would be inefficient or require specialized equipment.
* Think of it like cutting out the shape of a donut – you only remove the donut itself, not the whole area.

Now, let's look at why the other options are incorrect:
* Option A: Finishing a drilled hole: While trepanning *could* potentially be used for very precise finishing, it's not its primary purpose. Other processes like reaming are better suited for finishing.
* Option C: Truing a hole for alignment: Truing a hole for alignment is usually done with tools specifically designed for that purpose, not trepanning.
* Option D: Enlarging a drilled hole: While trepanning *could* technically enlarge a hole, it's not the most common or efficient method. Boring is usually the preferred method for enlarging existing holes.

Therefore, trepanning is primarily used for creating large holes without needing to drill away all the material.