10+ Interview Questions and Answers

Sub-type or specific failure stress for springs can include yield stress, ultimate tensile stress, fatigue stress, etc.

• Different types of springs may have different failure stresses

• Yield stress is the point at which a material begins to deform plastically

• Ultimate tensile stress is the maximum stress a material can withstand before failure

• Fatigue stress is the stress level at which a material fails after repeated loading cycles

Types of stresses include tensile, compressive, shear, bending, and torsional.

• Tensile stress: pulling force that stretches material apart (e.g. stretching a rubber band)

• Compressive stress: pushing force that squeezes material together (e.g. pressing on a spring)

• Shear stress: force that causes layers of material to slide past each other (e.g. cutting paper with scissors)

• Bending stress: combination of tensile and compressive stresses on opposite sides of a material (e.g. bendin...read more

Stress is internal resistance to deformation, while pressure is force applied over an area.

• Stress is a measure of the internal resistance of a material to deformation under an applied force.

• Pressure is the force applied perpendicular to the surface of an object per unit area.

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

• Examples: A rubber band under tension experiences stress, while a balloon filled with air exerts pressure on its walls.

Synchronous speed is the speed at which the magnetic field rotates in a synchronous motor.

• Synchronous speed is determined by the frequency of the power supply and the number of poles in the motor.

• Formula for synchronous speed: Ns = 120f / P, where Ns is synchronous speed in RPM, f is frequency in Hz, and P is number of poles.

• For example, a 4-pole motor connected to a 60 Hz power supply would have a synchronous speed of 1800 RPM.

Bernoulli's equation is a fundamental principle in fluid dynamics that relates pressure, velocity, and elevation.

• Assumptions: incompressible, inviscid, steady flow, no heat transfer

• Applications: aircraft wings, fluid flow in pipes, blood flow in arteries

• Bernoulli's equation: P + 1/2pv^2 + pgh = constant

• P = pressure, v = velocity, p = density, g = acceleration due to gravity, h = height

Units of pressure include pascal, bar, atmosphere, and psi.

• Pascal (Pa) is the SI unit of pressure

• Bar is commonly used in meteorology and scuba diving

• Atmosphere (atm) is the average pressure at sea level on Earth

• Pounds per square inch (psi) is used in engineering and automotive industries

Failure stress for spring is the maximum stress a spring can withstand before permanent deformation or breakage.

• Failure stress is determined by the material properties of the spring.

• Factors affecting failure stress include material type, manufacturing process, and design considerations.

• Examples of failure stress for springs include tensile strength, yield strength, and ultimate strength.

Atlas Copco GECIA is a leading provider of industrial equipment and services.

• Atlas Copco GECIA has a strong reputation for quality and reliability in the industry.

• They offer a wide range of products and services to meet the needs of their customers.

• Their focus on innovation and sustainability sets them apart from their competitors.

• They have a global presence and are committed to providing excellent customer service.

• Examples of their products include compressors, generators, a...read more

The German electronic car industry is a leading force in the global market, known for innovation and quality.

• Germany is home to major players like Volkswagen, BMW, and Mercedes-Benz who are investing heavily in electric vehicles.

• The industry is focused on sustainability and reducing carbon emissions, with a strong emphasis on research and development.

• German electric cars are known for their advanced technology, performance, and luxurious design.

• The government offers incentive...read more

Categories of strength in machine design include static strength, fatigue strength, impact strength, and toughness.

• Static strength: Ability to withstand a constant load without breaking.

• Fatigue strength: Ability to withstand repeated loading over time.

• Impact strength: Ability to withstand sudden shocks or impacts.

• Toughness: Ability to absorb energy and deform without fracturing.

Mechanical design is the process of creating physical products and systems using engineering principles and techniques.

• Involves designing components and assemblies for machines, vehicles, structures, etc.

• Requires knowledge of materials, manufacturing processes, and CAD software.

• Focuses on functionality, safety, and efficiency of the design.

• Examples include designing a car engine, a robotic arm, or a bridge structure.

Shear stress is a type of stress that acts parallel to a surface, causing layers of material to slide past each other.

• Shear stress is caused by forces applied parallel to a surface, leading to deformation.

• It is calculated as force divided by the area over which the force is applied.

• Shear stress is commonly seen in materials like fluids, where layers move at different speeds.

• Examples include cutting paper with scissors, or stirring a liquid causing layers to slide past each ot...read more

Types of compressors include reciprocating, rotary, centrifugal, and axial compressors.

• Reciprocating compressors use a piston to compress the gas.

• Rotary compressors use rotating impellers or screws to compress the gas.

• Centrifugal compressors use a rotating impeller to accelerate the gas and then convert the kinetic energy into pressure.

• Axial compressors use a series of rotating and stationary blades to compress the gas.

• Examples: reciprocating compressors are used in household...read more

Motor starters are devices used to start and stop electric motors safely and efficiently.

• Motor starters control the flow of electricity to the motor, protecting it from overloads and short circuits.

• They typically consist of a contactor, overload relay, and control devices like push buttons or switches.

• Motor starters can be manual or automatic, with features like thermal overload protection and phase loss detection.

• Examples of motor starters include direct-on-line starters, st...read more