Process Engineer Interview Questions

Break up the problem as much as possible to narrow down the solution. If you are on the right track, they will help you with the solution.

My advice to the technician would be to clean the wafers with acetone, ipa and di water after the acid cleaning, as acid cleaning removes the inorganic impurities but not the organic impurities, acetone, ipa and di water will remove the organic impurities and hopefully the defects will be reduced

My advice to the technician would be to clean the wafers with acetone, ipa and di water after the acid cleaning, as acid cleaning removes the inorganic impurities but not the organic impurities, acetone, ipa and di water will remove the organic impurities and hopefully the defects will be reduced

mostly the mountains

Hydrate formation Slugging and pressure loss

Pressure loss in the piping, the pumps may need a huge head / energy requirement to push the chemicals through. The different altitudes create a change in the chemical composition, increase vapor pressure which need to be compensated for before being pumped or reacted

Si can be used as a substrate in LEDs, but it cannot be used in the p-n junction because the bandgap energy is too small to produce visible light.

Technically: Yes. But it has an indirect bandgap, so you really wouldn't want to.

The energy bandgap of Si at room temperature is 1.12eV. Since the relationship between photon energy and wavelength is E(eV)=1.24/wavelength(micrometers), one can calculate that Si could emit a ligth in infrared optical spectrum: wavelength=1.24/1.12eV=1.11 micrometers. BUT, Si is indirect semiconductor! And therefore does not emit significant amounts of light due to the requirement of momentum conservation in optical transitions.

It seems you have no gas.but when you encountered an engine trouble you cannot easily determine the problem without knowledge of it.

objective: For example: diagnose & fix the car; or get out of nowhere; be at peace with being nowhere.

Hmmmm, "If you're stuck in the middle of nowhere with a broken down car, how can you determine what the problem is?" A. The problem is obvious :0 You're stuck in the middle of nowhere and your car is broken down! Hopefully you have a cell phone with a cell tower nearby.

No, the water neither rises nor falls. The buoyancy of the ice does not affect the water level, it will raise the water level if you add ice to an already full glass of water, however because ice is lighter than the water (which is the oddity of water as an element versus other elements on the periodic table), the level stays the same.

no, although the ice melts in a certain container if it is floating on a water the volume of ice is already condense on the water itself so water level will never change

no, the water level will remain the same because the displacement of the ice cube is what determines water level,not the volume of the portion of the ice cube that is submerged.

0 at center of plasma. No of electrons equal no ions. Positive on the sheath.

I think electrons are lost when the come in contact with chamber walls or electrodes and finally number of ions is more than electrons. So, plasma is positively charged between electrodes except near the electrode regions

480Hz

as for as I know its around ~30,000rpm. Correct me if I am wrong.