03 Workshop Practices Questions for Interviews

1. What is the purpose of a lathe machine?
• A lathe machine is used for shaping and machining cylindrical workpieces.
2. Explain the working principle of a milling machine.
• A milling machine uses a rotating cutter to remove material from a workpiece, creating complex shapes and profiles.
3. What are the different types of welding processes?
• The different types of welding processes include gas welding, arc welding, and spot welding.
4. How does a gas welding process work?
• In gas welding, a flame is used to heat the workpiece and the filler material, which are then fused together to form a joint.
5. What are the safety precautions to be taken while working in a workshop?
• Safety precautions in a workshop include wearing appropriate protective gear, using tools and machines correctly, and maintaining a clean and organized work area.
6. Explain the working principle of a shaper machine.
• A shaper machine uses a reciprocating cutting tool to remove material from a workpiece, creating flat surfaces and straight edges.
7. What is the difference between a drilling machine and a milling machine?
• A drilling machine is used to create holes in a workpiece, while a milling machine is used to remove material from a workpiece.
8. How is a gear cut in a gear shaping machine?
• In a gear shaping machine, a rotating cutter is used to gradually shape the teeth of a gear.
9. What are the different types of cutting tools used in a lathe machine?
• The different types of cutting tools used in a lathe machine include turning tools, boring tools, and threading tools.
10. Explain the working principle of a hydraulic press.
• A hydraulic press uses a fluid-filled cylinder to generate a large amount of force, which is then used to compress or shape a workpiece.
11. What is the purpose of a grinding machine?
• A grinding machine is used to remove small amounts of material from a workpiece, creating a smooth surface finish.
12. How is a thread cut in a lathe machine?
• A thread is cut in a lathe machine by using a threading tool to gradually shape the workpiece.
13. What are the different types of measuring instruments used in a workshop?
• The different types of measuring instruments used in a workshop include calipers, micrometers, and dial indicators.
14. Explain the working principle of a power hacksaw machine.
• A power hacksaw machine uses a reciprocating blade to cut through a workpiece, powered by an electric motor.
15. What is the difference between a bench vice and a pipe vice?
• A bench vice is used to hold a workpiece in place on a workbench, while a pipe vice is used to hold pipes or other cylindrical objects.
16. How is a sheet metal bent in a bending machine?
• A sheet metal is bent in a bending machine by applying force to the workpiece, causing it to deform and create a desired angle or shape.
17. What are the different types of files used in a workshop?

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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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