02Thermodynamics Interview Questions for PSUs

1. What is thermal engineering?
• Thermal engineering is a branch of engineering that deals with the study of heat transfer, thermodynamics, and energy conversion.
2. What is the first law of thermodynamics?
• The first law of thermodynamics is the law of conservation of energy, which states that energy cannot be created or destroyed, only transferred or converted from one form to another.
3. What is the second law of thermodynamics?
• The second law of thermodynamics states that the total entropy of a closed system always increases over time.
4. What is entropy?
• Entropy is a measure of the disorder or randomness of a system.
5. What is heat transfer?
• Heat transfer is the process of transferring thermal energy from one object or system to another.
6. What are the three modes of heat transfer?
• The three modes of heat transfer are conduction, convection, and radiation.
7. What is conduction?
• Conduction is the transfer of heat through a material without any movement of the material itself.
8. What is convection?
• Convection is the transfer of heat through the movement of a fluid, such as air or water.
9. What is radiation?
• Radiation is the transfer of heat through electromagnetic waves, such as light or infrared radiation.
10. What is a heat exchanger?
• A heat exchanger is a device that transfers heat from one fluid to another without the fluids coming into direct contact.
11. What is a refrigerant?
• A refrigerant is a substance that is used in a refrigeration cycle to transfer heat from one place to another.
12. What is a compressor?
• A compressor is a device that compresses a gas, such as a refrigerant, to increase its temperature and pressure.
13. What is a condenser?
• A condenser is a device that removes heat from a gas, such as a refrigerant, and converts it back into a liquid.
14. What is an evaporator?
• An evaporator is a device that absorbs heat from a liquid, such as a refrigerant, and converts it into a gas.
15. What is a Rankine cycle?
• A Rankine cycle is a thermodynamic cycle that is used in steam power plants to generate electricity.
16. What is a Carnot cycle?
• A Carnot cycle is a theoretical thermodynamic cycle that is used to determine the maximum efficiency of a heat engine.
17. What is a heat engine?
• A heat engine is a device that converts thermal energy into mechanical energy.
18. What is a heat pump?
• A heat pump is a device that transfers heat from a lower temperature source to a higher temperature sink.
19. What is thermal conductivity?
• Thermal conductivity is a measure of a material's ability to conduct heat.
20. What is thermal resistance?
• Thermal resistance is a measure of a material's ability to resist the flow of heat.

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01: Engineering Mechanics Interview Questions for PSUs

1. What is Engineering Mechanics?
• Engineering Mechanics is the branch of science that deals with the behavior of objects under the action of forces.
2. What are the types of forces?
• The types of forces are contact forces and non-contact forces.
3. What is a free body diagram?
• A free body diagram is a diagram that shows all the forces acting on an object.
4. What is the difference between a scalar and a vector?
• A scalar is a quantity that has only magnitude, while a vector is a quantity that has both magnitude and direction.
5. What is Newton's first law of motion?
• Newton's first law of motion states that an object at rest will remain at rest, and an object in motion will remain in motion with a constant velocity, unless acted upon by an external force.
6. What is Newton's second law of motion?
• Newton's second law of motion states that the acceleration of an object is directly proportional to the net force acting on the object, and inversely proportional to its mass.
7. What is Newton's third law of motion?
• Newton's third law of motion states that for every action, there is an equal and opposite reaction.
8. What is the principle of conservation of energy?
• The principle of conservation of energy states that energy cannot be created or destroyed, only transferred or transformed from one form to another.
9. What is the principle of conservation of momentum?
• The principle of conservation of momentum states that the total momentum of a system of objects remains constant if no external forces act on the system.
10. What is the difference between work and power?
• Work is the product of force and displacement, while power is the rate at which work is done.
11. What is stress?
• Stress is the force per unit area acting on a material.
12. What is strain?
• Strain is the deformation per unit length of a material.
13. What is Hooke's law?
• Hooke's law states that the deformation of a material is directly proportional to the force applied to it, as long as the material remains within its elastic limit.
14. What is the difference between stress and strain?
• Stress is the force per unit area acting on a material, while strain is the deformation per unit length of a material.
15. What is the difference between static and dynamic equilibrium?
• Static equilibrium is when an object is at rest, while dynamic equilibrium is when an object is moving at a constant velocity.
16. What is the difference between a machine and a structure?
• A machine is a device that converts one form of energy to another, while a structure is a system of interconnected parts that supports a load.
17. What is the difference between a beam and a column?
• A beam is a horizontal or inclined structural member that supports a load, while a column is a vertical structural member that supports a load.
18. What is the difference between a truss and a frame?
• A truss is a structure composed of interconnected triangles, while a frame is a structure composed of interconnected rectangles.
19. What is the difference between a simple machine and a compound machine?
• A simple machine is a machine that has only one moving part, while a compound machine is a machine that has two or more simple machines working together.
20. What is the difference between a kinematic chain and a mechanism?
• A kinematic chain is a series of interconnected links that transmit motion, while a mechanism is a system of interconnected parts that transmit motion and force.
  

Simulation Software: Secured Future of Mechanical Engineer

 (Photo source:pexels.com)

There is a single stream in mechanical engineering that focuses on developing and designing products. Before releasing a prototype as a product, individuals used to build it and then subject it to numerous experiments. These days, CAD software allows users to create a product and simulate it virtually using the CAD model—all without building a real prototype. Time and money are saved greatly by doing this. Ansys and Comsol Multiphysics are the two primary simulation programs used by industry in mechanical engineering. There is also a ton of useful open-source software available.   Acquiring knowledge of this software enhances your resume. However, you must become familiar with these software behemoths if you hope to aim to be hired by product design and development firms across the globe. There are numerous tutorials on YouTube that explain how to use the software. It is advisable to utilize them. You can work for software businesses directly if you learn to code. These are fulfilling careers that pay really well.

 

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