Electrical & Electronic Manufacturing interview questions | Glassdoor

# Interview Questions

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## Interview Questions

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### DeltaV Development at Emerson was asked...

Apr 4, 2011
 Describe some programs that you have written.3 AnswersSo when you said generic programming, do you mean questions regarding the generic programming paradigm? Or just general programming questions?It was generic programming paradigms like oop, etc. They did not ask questions like list the output or anything like that.So, there's a possibility they may ask questions about Generic Programming (i.e. the STL class that Downing (If you went to UT) teaches during the summer).

Jul 26, 2009
 3 boxes, 2 w/ 1 type item each & 1 mixed, labels are wrong, you get 1 pick from 1 box - can you correctly determine the right labels with 1 pick?3 Answerslogic test by S/W Engineering director, test of logical thinking - he couldn't answer my physics based bar trick question in replyThe answer is yes. The labels are all wrong, you pick one and you know it is correct. The other two are stil wrong. Switch the labels and they will be correct. Done.Let’s call the boxes A, B & Mix. Take item from the box marked Mix (must be single type since all labels are wrong), if the item found is B, it follows that: Box A (Mix), Box B (A) and of course Mix (B). If the item found is A, it follows that: Box A (B), Box B (Mix) and of course Mix (A).

### Design Verication Engineer at Zoran was asked...

Jul 16, 2010
 Given 3 consective numbers, the biggest and smallest are primes. Prove the number in the middle is divisible by 6.3 AnswersSince The Number is divisible by 6 so it must be divisible by both 2 & 3.But below 6 no number is available which is divisible by 6.Hence each number must be greater than 6. Now the the three numbers which come after 6 are 11,12,13,in which 11 and 13 are prime numbers and the middle number is 12 which is divisible by 6. Similiarly we can she all the three numbers in which 1st and 3rd numbers are prime whereas the middle number is diviisble by 6 Hence proved!5 - 6 - 7. YES. 3 - 4 - 5 NOT TRUE. One false example shows inability for proof.3 consecutive integers: one must be divisible by 2; three integer; there is at least one which can be divided by 3; since the two-side integers are prime, then the middle one must can be divided by3 and 2; it means the middle can be divided by 2*3=6. Easy

### Process Development Engineer at Cree was asked...

Oct 30, 2011
 Can Si be used to make LEDs ?3 AnswersSi 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.

### Engineering at Intersil was asked...

Apr 12, 2010
 List all the possible uses for a diode3 Answersrectifier, TVS, varicapdon't forget Gunn Diodes can be used for an RF Relaxation Oscillator. III-V diodes are also good for light emission Diodes are also great temperature sensors And/OR gates Ionizing Radiation Detectors (Generate EHPs and inject carriers to create current) Almost all devices contain PN junctions (MOSFETs, MESFETs, DIACs TRIACs, BJTs, LEDs, Zeners, Tunnel Diodes, Vericaps) A better question would have been, "What diode is not made of a PN junction" Answer Metal-Semiconductor Junctions (aka Schottky Diode)Don't forget the classic diode detector.

### Mechanical Engineer at Cooper Industries was asked...

Jan 22, 2012
 You are in a boat and you threw the anchor into the river. The anchor settled on the lake floor. What happens to the level of water before and after the anchor is dropped ?5 AnswersDrops.Nothing happened to the water level because its a flowing river, not a standing body of water.Well which is it a river or a lake? Depends on the mass of and volume of the anchor. Is the mass enough to use the boat to displace more water than the volume of water displaced by the anchor being moved into the water?Show More ResponsesIn general the level of the water drop because the density of the steel (for example) or other material of the anchor is bigger than the density of the water.I'm not in a lake I am on a river.

### Electrical Engineering Intern at Rockwell Automation was asked...

Oct 20, 2013
 What are some of your weaknesses?3 AnswersThat sometimes I am too attentive to detail. I know this may be said alot, but it is true, I tend to pour over details to make sure there aren't any errors, which could sometimes consume too much time.was there a drug test? urine or hair?Employment offer is made pending urine drug test.

### ASIC Verification Engineer at Magnum Semiconductor was asked...

Jul 2, 2010
 how do you build a mux out of xor gates?3 AnswersThe answer is you can NOT derive the equation of XOR and MUX by yourself, you will seeOh that is so not true.......!http://digitalelectronics.blogspot.co.il/2005/11/mux-out-of-xor.html

### Senior ASIC Design Engineer at Applied Micro Circuits was asked...

Jun 15, 2009
 which is hard to fix -- setup violation or hold violation? And why?3 AnswersI answered setup, then they asked again how to fix the setup violation.Should be the hold time violation. Setup time violation can be solved by increasing the time period; however, hold time violation should be solved by inserting delay into the timing path carefullyI think it depends on which stage the problem is detected. If after tape out, it's absolutely hold time because you cannot easily change the logic of chip. But if it is still in RTL coding stage, hold time may be easily fixed by adding some buffers.