20+ Edison Engineer Interview Questions and Answers

Answering questions related to stress-strain curves, finite element method, structure design, and weak vs strong form solutions.

• 1) Stress vs strain curve: Brittle materials have a steep curve with low strain at failure, while ductile materials have a gradual curve with high strain at failure.

• 2) Shape functions in finite element method: Mathematical functions used to approximate the unknown behavior of a structure within each finite element.

• 3) Designing a structure with consta...read more

Axial compressor is a key component in gas turbine engines that compresses air before combustion.

• Axial compressor consists of multiple stages of rotating blades and stationary vanes.

• Each stage compresses the air and increases its pressure.

• The compressed air is then mixed with fuel and ignited in the combustion chamber.

• The hot gases produced by combustion expand and drive the turbine, which in turn drives the compressor and the generator.

• Efficiency of the axial compressor is c...read more

Algorithm to store data in different formats

• Identify the data types and formats needed

• Create a data structure to hold the data

• Implement functions to convert data to desired formats

• Examples: JSON, CSV, XML, SQL

• Consider data security and privacy

To find stress and failure condition for a truss system, analyze the forces acting on each member and calculate the stress using appropriate equations.

• Analyze the forces acting on each member of the truss system

• Calculate the stress using appropriate equations

• Determine the failure condition based on the material properties and stress values

• Examples of equations: axial stress = force/area, bending stress = (force x length)/(moment of inertia x distance from neutral axis)

Stress is the force per unit area, while pressure is the force per unit area exerted by a fluid.

• Stress is a measure of the internal forces within a material, while pressure is the force exerted on a material from the outside.

• Stress is a scalar quantity, while pressure is a vector quantity.

• Stress is measured in units of force per unit area, while pressure is measured in units of force per unit area.

• Examples of stress include tension, compression, and shear stress, while exampl...read more

Use Singular Value Decomposition (SVD) to reduce matrix size while preserving important information.

• SVD breaks down a matrix into its constituent parts, allowing for the removal of less important information.

• The resulting smaller matrix can be used to approximate the original matrix with minimal loss of important information.

• This technique is commonly used in image compression and data analysis.

• Example: A 1000x1000 matrix can be reduced to a 100x100 matrix using SVD.

Discretization schemes are used in CFD to approximate continuous equations. Error analysis is used to evaluate the accuracy of the approximation.

• Discretization schemes involve dividing the domain into smaller elements and approximating the equations within each element.

• Common schemes include finite difference, finite volume, and finite element methods.

• Error analysis involves comparing the numerical solution to the exact solution or a more accurate approximation.

• Sources of err...read more

Different failure theories include fatigue, fracture mechanics, creep, and corrosion.

• Fatigue theory explains how materials fail under repeated loading and unloading cycles.

• Fracture mechanics theory explains how cracks in materials grow and lead to failure.

• Creep theory explains how materials deform over time under constant stress.

• Corrosion theory explains how materials degrade due to chemical reactions with their environment.

Ductility is the ability of a material to deform under tensile stress. Strain hardening is the increase in strength of a material due to plastic deformation.

• Ductility allows a material to be drawn into a wire or hammered into a thin sheet without breaking.

• Strain hardening occurs when a material is deformed beyond its elastic limit, causing dislocations in the crystal structure.

• Examples of ductile materials include copper, gold, and aluminum.

• Examples of strain hardening materi...read more

The expression of lift over air fail is derived using Bernoulli's principle and the equation for lift force.

• Lift force is equal to the product of air density, velocity squared, wing area, and lift coefficient.

• Airfoil shape and angle of attack affect lift coefficient.

• Bernoulli's principle states that as air velocity increases, air pressure decreases.

• The pressure difference between the top and bottom of a wing creates lift.

• The expression for lift over air fail is lift force div...read more

Sorry, I cannot answer this question without knowing the series.

• Without knowing the series, it is impossible to predict the next few numbers.

• The series could follow any pattern or rule, making it unpredictable without more information.

• It is important to have all the necessary data before attempting to make predictions.

The crusher model is not specified.

• Unfortunately, the crusher model is not provided in the question.

• Therefore, the TPH (tonnes per hour) and power consumption cannot be determined.

• Without this information, it is impossible to accurately answer the question.

C section beam is poor in torsion compared to I section beam.

• C section beam has a lower torsional rigidity due to its shape

• I section beam has a higher torsional rigidity due to its symmetrical shape

• C section beam is more prone to twisting under load

• I section beam is commonly used in structures where torsional forces are present

Thick of pressure vessel is determined by factors like pressure, temperature, material, and safety factor.

• Pressure vessel thickness is calculated using various codes and standards like ASME BPVC, EN 13445, PD 5500, etc.

• Factors like pressure, temperature, material properties, and safety factor are considered while determining the thickness.

• The thickness calculation involves determining the maximum allowable stress, hoop stress, and longitudinal stress.

• The thickness also depend...read more

Al and Cu have different stress strain diagrams due to their different material properties.

• Al has a higher yield strength and ultimate tensile strength than Cu.

• Cu has a higher ductility than Al.

• Al has a more linear stress strain curve than Cu.

• Cu exhibits necking before fracture, while Al does not.

• The modulus of elasticity for Al is higher than Cu.

Different failure theories include fatigue, fracture mechanics, and creep.

• Fatigue theory: failure due to repeated loading and unloading

• Fracture mechanics: failure due to cracks and defects in materials

• Creep theory: failure due to long-term exposure to high temperatures and constant stress

Strength of materials refers to the ability of a material to withstand external forces without breaking or deforming.

• It is important in engineering design to ensure that materials used can withstand the expected loads and stresses.

• Factors that affect strength of materials include material composition, shape, and size.

• Testing methods such as tensile testing and compression testing are used to determine the strength of materials.

• Examples of strong materials include steel, titan...read more

Drilling and blasting is a method used in mining and construction to break up rock formations.

• Drilling involves creating holes in the rock using specialized equipment.

• Blasting involves filling the holes with explosives and detonating them to break up the rock.

• This method is commonly used in mining to extract minerals from the earth.

• It is also used in construction to create tunnels, foundations, and other structures.

• Safety is a major concern in drilling and blasting operations...read more

Loop in linked list and various scenarios

• A loop in a linked list occurs when a node points to a previous node in the list

• Scenarios include detecting and removing loops, finding the length of the loop, and breaking the loop

• Floyd's cycle-finding algorithm is commonly used to detect and remove loops

Mines cost refers to the expenses incurred in the process of mining minerals or metals.

• Mines cost includes expenses related to labor, equipment, energy, and materials.

• The cost of mining can vary depending on the type of mineral or metal being extracted and the location of the mine.

• For example, the cost of mining gold in South Africa is higher due to the depth of the mines and the labor-intensive process.

• Mines cost can also be affected by government regulations and taxes.

• Effic...read more