1. Tell me what does F.O.F. stand for in piping design?
FOF stands for Face of Flange. A flange has either of the two types of faces:
a) Raised face
b) Flat face
The F.O.F is used to know the accurate dimension of the flange in order to avoid the minute errors in measurement in case of vertical or horizontal pipelines.
2. How do you deal with stress as Design Engineer?
Every mechanical engineer has to address the concerns of stress on the job. How do they deal with stress? How do they channel negative energy?
3. Tell me what is the role of nitrogen in welding?
Nitrogen is used to prevent porosity in the welding member by preventing oxygen and air from entering the molten metal during the welding process. Other gases are also used for this purpose such as Argon, Helium, Carbon Dioxide, and the gases given off when the flux burns away during SMAW (stick) welding.
4. Tell me why gas containers are mostly in a cylindrical shape?
The ideal shape would be a sphere. The container must have the capacity to withstand the extremely high pressure of liquefied gas. A spherical shape helps in distributing these forces uniformly.
5. Do you know why gas containers are mostly cylindrical in shape?
The most efficient shape for withstanding high pressure is a sphere but that would be costly to manufacture. A cylinder with a domed top and a domed bottom (look underneath, the flat base is actually welded around the outside, the bottom of the gas container is actually domed) is a much cheaper shape to manufacture whilst still having good strength to resist the internal gas pressure.
6. Explain me what does 8.8 mark on the bolt signify?
It gives you value of tensile strength and yield strength.
For eg. The tensile strength over here in 8.8 marking bolt would be 800 N/mm^2 and its yield strength is 640 which is 80% of the tensile strength.
It is a process of heating a material above the re-crystallization temperature and cooling after a specific time interval. This increases the hardness and strength if the material.
8. Do you know what is torque?
Torque is the force that causes rotation. It is a measure of how much force is acting on an object making it rotate.
9. Tell me what is the ratio of specific heat of air?
The ratio of specific heat γ=CP/CV is a factor in adiabatic engine processes and in determining the speed of sound in gas. This ratio γ=1.66 for an ideal monoatomic gas and γ=1.4 for air, which is predominantly a diatomic gas.
10. Tell me where pneumatic system is used?
Any system needs redundancy in work needs pneumatics, because the compressor of the pneumatic system has periodical operations (intermittent work, not as hydraulic pump). The compressed air could be accumulated in tanks with high pressures and used even if the compressor failed.
