Vesuvius Maintenance Engineer Interview Questions and Answers

Methods for measuring with a micrometer and a vernier caliper

• For micrometer: Close the jaws gently around the object being measured, read the measurement from the scale, and add any additional measurements from the thimble.

• For vernier caliper: Close the jaws around the object, read the main scale measurement where the zero mark on the vernier scale aligns, then add the vernier scale measurement for precision.

• Ensure the...read more

Casting is a manufacturing process in which a liquid material is poured into a mold, where it solidifies into the desired shape.

• Melted material is poured into a mold

• The material solidifies and takes the shape of the mold

• The mold is then removed to reveal the final product

Cope and drag are the two halves of a mold used in casting processes to create a cavity for the molten metal.

• Cope is the top half of the mold, while drag is the bottom half.

• The cope and drag are typically made from sand and are used to create a cavity in which the molten metal is poured.

• After the metal has solidified, the cope and drag are separated to reveal the casting.

Different types of cylinders include single-acting, double-acting, telescopic, and impact cylinders.

• Single-acting cylinders: Operate in one direction using fluid pressure to extend or retract the piston.

• Double-acting cylinders: Use fluid pressure to extend and retract the piston in both directions.

• Telescopic cylinders: Consist of multiple nested stages that allow for a longer stroke length in a compact design.

• Impact cy...read more

Pneumatic systems use compressed air to transmit power, while hydraulic systems use fluid (usually oil) to transmit power.

• Pneumatic systems use air as the working fluid, while hydraulic systems use oil or other fluids.

• Pneumatic systems are generally cleaner and easier to maintain than hydraulic systems.

• Hydraulic systems can handle higher loads and pressures compared to pneumatic systems.

• Pneumatic systems are often used...read more

Heat exchangers are devices used to transfer heat between two or more fluids, without mixing them together.

• Shell and tube heat exchanger

• Plate heat exchanger

• Double pipe heat exchanger

• Finned tube heat exchanger

• Spiral heat exchanger

Different types of bearings include ball bearings, roller bearings, plain bearings, and fluid bearings.

• Ball bearings are used in applications requiring low friction and high speed, such as in wheels and conveyor belts.

• Roller bearings are suitable for heavy radial loads, such as in automotive transmissions and industrial machinery.

• Plain bearings, also known as bushings, are used in applications where lubrication is diff...read more

Heat treatment is a process used to alter the physical and sometimes chemical properties of a material through heating and cooling.

• Heat treatment involves heating a material to a specific temperature, holding it at that temperature for a certain amount of time, and then cooling it at a controlled rate.

• The process can be used to increase the hardness, strength, toughness, and ductility of a material.

• Common heat treatmen...read more

Defects in casting process include porosity, shrinkage, cold shuts, misruns, and inclusions.

• Porosity: air or gas trapped in the casting

• Shrinkage: volume reduction during solidification

• Cold shuts: incomplete fusion of molten metal

• Misruns: incomplete filling of the mold cavity

• Inclusions: foreign materials trapped in the casting

Types of sand used in casting include green sand, resin sand, shell mold sand, and sodium silicate sand.

• Green sand: most commonly used type, made of silica sand mixed with clay and water

• Resin sand: mixed with resin and hardener for better surface finish and dimensional accuracy

• Shell mold sand: uses a resin-coated sand that is heated to form a shell around the pattern

• Sodium silicate sand: uses sodium silicate as a binde...read more