Preguntas de entrevista de Process development engineer

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Wolfspeed
A un Process Development Engineer le preguntaron...30 de octubre de 2011

Can Si be used to make LEDs ?

3 respuestas

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

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. Menos

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. Menos

Wolfspeed

Estimate the number of flat tyres in the US in a year?

3 respuestas

345632. How can you say that? Go count yourself

Give a ball park figure based on your reasoning. Should be simple

Per Wiki, 220 million. One would need to know how many cars are driven in US or that a flat tire occurs every 7 seconds. Did you know "Current US Population is 314.69 million". Menos

Wolfspeed

How many lightbulbs would we have to sell to replace every incandescent bulb in every american home?

3 respuestas

Weird question. What's the answer?

2 billion

70% more than what has already been sold.

Glidewell Dental

1) Tell me something about your previous work in the field of process Development 2) Ask more about projects, so u should have a deep understanding of your projects, dont forget to learn the most specific details and Analytics. 3) If you have a previous work exp of even 1 month the interviewer will consider you as professional who has already learned every thing in the brief professional career span.

2 respuestas

I tried to answer every thing i knew about. I answered my projects very well, but they need someone who has atleast 2-3 years of extensive experience. Menos

How long does it take for them to inform you if you got the job?

Wolfspeed

If a glass of water is half full and you put ice in it, when ice melts, the water level will increase of decrease or remain constant? Give scientific reason.

2 respuestas

The ice will float with a fraction of the ice cube sticking above the surface which is determined by the ratio of the density of water to the density of ice. Since these densities do not change as the ice melts, the fraction of ice above the water surface will never change. Since the fraction of ice above the water's surface never changes, the volume decrease of ice below the water surface during melting is always exactly replaced with an equivalent volume of melt. Therefore the water level in the glass will not change throughout the melting process. Menos

It will remain constant

Wolfspeed

How many barbers to cut men's hair in a city of 2 million people?

2 respuestas

I got the same answer, based on eight hour work days with 2 weeks of vacation each year. Based on the interviews I have read, if CREE hired the barbers, they would only need 1500, since they would be working 80-hour weeks. Menos

~3000 barbers. Work your way to the answer.

Illumina

How do you find your computer's IP address? What are DNAs made of? How do you break the bonds between DNA? What does a double helix look like? What is mean, median, mode, standard deviation? Ideal work environment? Ideal manager? Any work environment that you won't survive?

2 respuestas

Double helix looks like a twisted ladder.

Mean is the average. Median is the middle number of the set of numbers arranged in a numerical order. Mode is the number that has the most repetitions. Std deviation is a measure of how spread out numbers are. Menos

Samsung Electronics

Are you ready to study Korean language?

2 respuestas

i would love to...learn..

You need to show at least some interest.

What would be the time mix that I would prefer , Computer / Document , vs out in the plant .

2 respuestas

Basically , whatever would be required to achieve the objective. I am most oriented to on the floor work . Menos

I like to choke my🐓and spank my 🐒 while i vape thc in my little vdub girlie car . I think im so freaking cool but im just a closet queen waiting to have enough money to have my va gina made from my small p enis Menos

St. Jude Medical

Overall experience was good.They asked for exprience in medical device industry.Asked about some engineering project. Also, asked more about the application of statistical methods in manufacturing.The interview was aproximately 1 hour long.

2 respuestas

Was the drug test a urine test?

Yes

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