Workshop Technology MCQ Questions & Answers | Mechanical Engineering

The diaphragm moulding machine is used to Give uniform sand hardness throughout the mould

Centrifugal casting is a process that delivers components of high material soundness.
By spinning a mold while molten metal is poured into it, centrifugal force acts to distribute the molten metal in the mold at pressures approaching 100 times the force of gravity.

The temperature of the inner luminous cone of neutral flame is about 3200°C

The acetylene cylinder is usually painted with maroon colour.
An acetylene cylinder has a different design from most other gas cylinders. It consists of a steel shell containing a porous mass. The acetylene gas in the cylinder is dissolved in acetone which is absorbed by the porous mass.

The oxygen cylinder is usually painted with Black colour

Punching is a sheet metal operation in which a cylindrical hole or any other desired shape is cut out from a metal sheet using a punch and die set.

In this process, the punch applies pressure on the sheet metal, forcing the material into the die opening. The portion of the metal that is removed (the slug) is considered scrap, and the remaining sheet with the hole is the useful part.

Piercing is a similar process, but it generally refers to making small holes or slots without removing significant material, often as part of a larger forming operation.

Blanking is the reverse of punching. In blanking, the cut-out portion (blank) is the useful part, while the remaining sheet is scrap.

Shearing refers to the cutting of a sheet along a straight line using shearing blades, not by punch and die action.

Therefore, the operation of cutting a cylindrical hole in a sheet of metal using a punch and die is known as punching.

Hence, the correct answer is Option C: Punching.

A moving mandrel is used in Tube drawing

The electrode tip diameter (d) in spot welding should be equal to $$\sqrt {\text{t}} $$ .

Casting is a manufacturing process in which a liquid material is usually poured into a mold, which contains a hollow cavity of the desired shape, and then allowed to solidify. The solidified part is also known as a casting, which is ejected or broken out of the mold to complete the process.

The angular clearance on dies varies from 0.5° to 1°
In drawing operation, the metal flows due to plasticity
In press operation, the size of the pierced hole is independent of the size of punch