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Pergunta feita para IPhone Product Design Engineer...9 de março de 2017

How does the modulus of full hard stainless compare to fully annealed stainless?

4 respostas

Modulus would be higher for hardened steel

A hardened steel goes through a heat treatment process that reaches very high temperatures until it is quenched in oil, usually. Then it goes through another tempering process. This results in really high hardness, stiffness and overall strength. An annealed steel goes through a heating process but it's then cooled slowly. This causes a bit of relief in the crystalline structure. It becomes more ductility and less hard than untreated steel. The E of a hardened steel could rise from 200GPa to very high 700GPa while that of annealed steel stays around the untreated range depending on the alloy. 200-300GPa. Menos

Mostly it remains the same. Consider Stress-Strain diagram. Youngs Mod (E) is only in the linear region. Beyond the linear region, we can not apply the value of E to solve for nonlinear behaviors. Now consider Heat treatment processes (They can raise or lower the yield strength, UTS, etc of a material after heat treatment process) but the Linear region will still have the same slope as untreated material. Menos

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How would I implement the 'ls' command in Unix?

3 respostas

I did not have sufficient knowledge in filesystems to answer that question.

I remember the way how I did it when I was in college is to first to know the current directory then you iterate each of file/directory nodes in the file system at that level and print out each of them one at time. Menos

If this is in reference to the command line. Typing ls in terminal in the "desired" file directory, will output all files within that file. So, for example if you navigate to your "documents" folder and type "ls" you will see all files contained inside your documents folder. Menos


What are 5 ways to put a hole in a sheet of metal?

3 respostas

insert a hot metal which can melt a hole in the sheet, drill, cut and punch

Mill, Drill, Punch, Cut (Laser, Water jet cutter, Acetylene)

drill, cut , punch


How does the runtime program loader work?

2 respostas

this depends a lot on the executable file format and what the OS expects an 'executable' to be (a DOS COM file won't work like a Linux ELF or an OSX Mach-O file) however, the loader should be ready to resolve dynamic symbols needed by the file, by loading and mapping libraries into the new process' address space (unless symbols are loaded lazily, such as GetProcAddress() in Win32). once all this is complete, the loader should give control to the start routine of the process, which in most cases is not going to be the user's provided main() but some standard library initializing routine Menos

dunno. Seen it in college, never had to worry about those details.


What are 4 ways to connect a plastic and a metal?

2 respostas

3 categories in total. Either the plastic melt as an adhesion, or a 3rd part added as an adhesion, or metal melt as an adhesive. . So hot melt, insert molded, glued, PSA, LDS, metal plating on plastic. Menos

1. Bolts (with either thread the metal or use threaded insert in the plastic) 2. Adhesive 3. Rivet very carefully 4. Snap fit the plastic Menos


Related to iPhone Mobile Technology

1 respostas



Roleplay a call with the interviewer. They were a girl getting married and having phone issues that day. She called in a panic, wanting to get it fixed.

1 respostas

They want you to "acknowledge, align, and assure" the customer. Just state what they need done back to them, say "that must be very stressful since it's your big day," and "I'll do everything I can to fix that for you." The rest doesnt matter; they're just trying to see that you know how to talk to people. Menos


My involvement into technical event at my college.

1 respostas

Fortunately, I had a lot to tell as I had been an active member of my College technical events committee. Menos

Usuals questions about my job

1 respostas

usual answers about my job


Some basic iPhone SDK questions

1 respostas

just say what you knows about it.

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