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10+ Arpita Karkarey's Walnut School Interview Questions and Answers

Updated 21 Jan 2025

Q1. What are the methods for measuring with a micrometer and a vernier caliper?

Ans.

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 objects being measured are clean and free from debris to ...read more

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Q2. What are cope and drag in the context of casting processes?

Ans.

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.

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Q3. What is the difference between pneumatic and hydraulic systems?

Ans.

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 in applications where cleanliness is important, such as i...read more

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Q4. What are the different types of bearings and their applications?

Ans.

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 difficult, such as in hinges and pivots.

  • Fluid bearings use a t...read more

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Q5. What are the defects associated with the casting process?

Ans.

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

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Q6. What are the different types of cylinders?

Ans.

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 cylinders: Designed to deliver a high force in a short amoun...read more

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Q7. What are the different types of heat exchangers?

Ans.

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

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Q8. What are the types of sand used in casting?

Ans.

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 binder, good for large castings and high-temperature applicatio...read more

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Q9. What is the process of casting?

Ans.

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

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Q10. What is the heat treatment process?

Ans.

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 treatment processes include annealing, tempering, quenching, and c...read more

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