10+ Startek Interview Questions and Answers

SS304 and SS316 are both austenitic stainless steels with different compositions and properties.

• SS304 contains 18% chromium and 8% nickel, while SS316 contains 16% chromium, 10% nickel, and 2% molybdenum.

• SS316 is more corrosion-resistant than SS304, especially in chloride environments.

• SS304 is commonly used in food processing equipment, kitchen appliances, and chemical containers, while SS316 is used in marine applications, pharmaceutical equipment, and medical implants.

• Both ...read more

304, 304L, and 316 stainless steel grades differ in their carbon content, corrosion resistance, and applications.

• 304 stainless steel contains 18% chromium and 8% nickel, while 304L has a lower carbon content to prevent sensitization during welding.

• 316 stainless steel contains 16-18% chromium, 10-14% nickel, and 2-3% molybdenum for increased corrosion resistance, making it suitable for marine environments.

• 304 and 304L are commonly used in food processing equipment, kitchen app...read more

The formula for calculating stress and strain in materials is based on Hooke's Law.

• Stress (σ) = Force (F) / Area (A)

• Strain (ε) = Change in length (ΔL) / Original length (L)

• Hooke's Law: Stress = Young's Modulus x Strain

• Example: If a force of 100 N is applied to a material with a cross-sectional area of 2 m^2, the stress would be 50 N/m^2

Stress-strain graph of stainless steel shows high strength and ductility.

• Stainless steel has a linear elastic region followed by a yield point and then strain hardening.

• The ultimate tensile strength of stainless steel is higher than mild steel.

• Stainless steel exhibits a significant amount of plastic deformation before failure.

• The area under the stress-strain curve represents the energy absorbed by the material during deformation.

Design parameters are the specific requirements that an equipment must meet to function effectively.

• Design parameters include factors such as size, weight, power consumption, and operating temperature.

• Other important parameters may include durability, reliability, and ease of maintenance.

• For example, when designing a car engine, parameters such as horsepower, torque, and fuel efficiency must be considered.

• Similarly, when designing a medical device, parameters such as accuracy...read more

Stainless steel has unique material properties due to its composition.

• Stainless steel is corrosion-resistant due to the presence of chromium.

• It has high strength and ductility.

• Stainless steel is non-magnetic in its annealed state.

• It has a high melting point and is resistant to high temperatures.

• Stainless steel is also easy to clean and maintain.

• Different grades of stainless steel have varying properties.

The process for selecting a pump involves determining the required flow rate, head, type of fluid, system characteristics, and budget constraints.

• Identify the required flow rate and head for the system

• Consider the type of fluid being pumped (e.g. water, oil, chemicals)

• Evaluate the system characteristics such as pressure, temperature, and viscosity

• Take into account budget constraints and operational costs

• Select a pump type that meets the requirements identified

Explanation of bending moment diagram

• Bending moment diagram is a graphical representation of the variation of bending moment along the length of a beam

• It is used to determine the maximum bending moment and the location of the maximum bending moment in a beam

• The area under the bending moment diagram represents the shear force acting on the beam

• The bending moment at any point on the beam can be calculated by taking the algebraic sum of the moments to the left or right of that p...read more

Understanding basic strength of materials formula, material properties, and pump operation is essential for a design engineer.

• Strength of materials formula includes stress, strain, and modulus of elasticity

• Material properties include density, thermal conductivity, and coefficient of thermal expansion

• Pump operation involves understanding flow rate, head, and efficiency

Elasticity formula relates to the ability of a material to deform under stress and return to its original shape when the stress is removed.

• Elasticity formula is typically represented as stress divided by strain: E = σ / ε

• Stress is the force applied to a material per unit area, while strain is the resulting deformation of the material.

• The elasticity formula is used to determine how much a material will deform under a given amount of stress.

• For example, a rubber band has high e...read more