HEG Mechanical Maintenance Engineer Interview Questions and Answers

Prandtl number is a dimensionless number used in fluid mechanics to describe the ratio of momentum diffusivity to thermal diffusivity.

• It is named after the German physicist Ludwig Prandtl.

• It is used to predict fluid flow behavior and heat transfer in different materials.

• It is calculated as the ratio of kinematic viscosity to thermal diffusivity.

• It is important in the study of boundary layers, turbulence, and convection...read more

Manholes are circular because they cannot fall through their own opening.

• Circular manholes cannot fall through their own opening, unlike square or rectangular ones.

• Circular shape distributes weight evenly, making it easier to move and handle.

• Circular shape also reduces the risk of injury from sharp corners.

• Circular manholes are easier to manufacture and install.

• Circular shape allows for easier access from any angle.

• Cir...read more

Bernoulli's equation relates the pressure, velocity, and height of a fluid in motion.

• Bernoulli's equation is based on the principle of conservation of energy.

• It is commonly used in fluid mechanics to analyze the flow of fluids through pipes and channels.

• The equation states that as the velocity of a fluid increases, its pressure decreases, and vice versa.

• It can be expressed as P + 1/2ρv^2 + ρgh = constant, where P is pr...read more

Stress strain curve shows the relationship between stress and strain in a material. Steel is stronger but less ductile than aluminum.

• Stress strain curve is a graphical representation of the behavior of a material under stress

• Steel has a higher yield strength and ultimate strength than aluminum

• Aluminum is more ductile and has a higher strain hardening capacity than steel

• Steel is more brittle than aluminum and is prone t...read more

Different sheet metal manufacturing processes and their suitability based on volume, lead time, and cost.

• Laser cutting for high volume and precision

• Punching for medium volume and cost-effective production

• Waterjet cutting for low volume and complex shapes

• Bending for forming and shaping

• Stamping for high volume and repetitive shapes

• Roll forming for continuous production of long parts

• Choosing the right process based on the...read more

A free body diagram is a visual representation of the forces acting on a body.

• It shows all the external forces acting on a body

• It helps in analyzing the forces and their effects on the body

• It is used in engineering to design and analyze structures and machines

• It is important to label all the forces and their directions in the diagram

Answering questions related to self introduction, family background, least count of Vernier caliper, screw gauge, first angle and third angle projection.

• Self introduction: Briefly introduce yourself, highlighting your education and experience in the field of mechanical engineering.

• Family background: Share a few details about your family, such as their occupation or any influence they had on your career choice.

• Least cou...read more