Lutron Electrical Engineer Interview Questions & Reviews
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Innovative Leadership Program : Project Electrical Engineer Interview (Positive Experience)
I applied online and the process took a day - interviewed at Lutron.
Interview Details – The 1st round interview process was a phone interview which is an hour long. The next stage is a day long interview process. If they stop the interview after lunch u can understand that u are no longer considered
Interview Question – The questions are the exact same what was mentioned by the other candidates. Tough luck Answer Question
Electrical Engineer Interview (Positive Experience; Average Interview)
I applied online and the process took 2 weeks - interviewed at Lutron.
Interview Details – I received a phone call from some recruiter told me that the company liked to have engineers "grow"... So I got a phone interview set up with the HR who of course took forever to set it up, then I interviewed w/ an engineer and I felt like I did fairly well he told me that the company was really innovative and didn't just look at how book smart you are but also how can you develop hardware use testing equipments...
Interview Question – Technical questions are pretty tough...
It is just that you are expected to remember equations from Microelectronics... Answer Question
Project Electrical Engineer - Analog Interview (Neutral Experience; Average Interview)
I applied online and the process took 2 weeks - interviewed at Lutron.
Interview Details – I applied for the electrical engineer position and my background is in power electronics. The phone interview has three parts. The first part of the interview is an introduction of yourself and some questions about the projects on your resume. The interviewer is quite interested in the projects related to DCDC converters. The second part is an IQ question. There are three light bulbs in a room and three switches controlling them in another room. You can only go to each room once. Then, you need to decide the corresponding switch for each light bulb. The last part of the interview is questions about buck converter.
Interview Question – The IQ test is quite unexpected. For engineer position, few companies has patience for questions other than your experience. View Answer
Innovation Leadership Program - Project Electrical Engineer Interview (Positive Experience; Difficult Interview)
I applied online and the process took 1+ week - interviewed at Lutron in January 2014.
Interview Details – Applied through their website and got a phone interview within a week. Phone interview was about 45 minutes long, and covered basic questions (both behavioral and technical). Technical questions like uses/applications of resistors, capacitors and inductors, BJTs & FETs, voltage regulator etc. It was easy and comfortable. I got an email within 2-3 days for an on-site interview at Coopersburg, PA.
The interview began around 8:15 AM with a tour of one of their residential experience centers (it was amazing). Then there was an HR type interview (about 30-45 min) covering basic behavioral questions like why choose Lutron, this major, this school, favorite courses, work/internship experience, how did you solve a difficult situation at your internship/school.
Then there was technical interview with two people for about 60-90 min covering two questions/problems: 1) Two bulbs are in series, so which one will grow brighter (really simple problem; use P=VI to solve). 2) pnp transistor with a capacitor on collector and voltage source between base and emitter (this was a bit tricky and cost me the interview). The transistor is basically a current source for the capacitor. I was asked to draw the output voltage and current characteristics. They kept asking why are you doing this, how will you do proceed next. This was a bit uncomfortable as I was not sure.
After the technical round, there was "brainstorming" session in which was basically role playing kind of thing. This may seem easy but they are looking for innovative ideas in this discussion. They are not necessarily seeking logical answers but new 'out of the box' ideas. This went on about 45 minutes. Be careful on this one!
Lunch and tour with an employee, and then bye bye.
Interview Question – Brainstorming session. Answer Question
Project Electrical Engineer Interview (Neutral Experience)
I applied through college or university and interviewed at Lutron.
Interview Details – First Round was an hour long phone interview. If you get through, they invite you to a day long on-site second round.
Interview Question – There are three sockets inside a room and three switches outside. You want to find out which switch controls which socket but you can only enter the room once. How would you do it? View Answer
Innovative Leadership Project Electrical Engineer 2014 (Analog) Interview (Positive Experience; Difficult Interview)
I applied through college or university and the process took a day - interviewed at Lutron in November 2013.
Interview Details – Innovative Leadership Project Electrical Engineer 2014 (Analog)
Phone interview round- asking basic questions on the resume, pretty much everything, and technical: DC-DC converter component; if you want to reach certain Vout, what should you do? I first said a voltage divider, but their expected answer is a DC regulator. They also asked me about components in the DC regulator.
Invited to their headquarter Coopersburg, PA two weeks later. I was too excited to be on a first time site- interview that I did not sleep well the night before, which was bad.
They took me a tour of their lights, and ideal high-end home design.
Behavioral Interview - No hard questions. What is the most innovative thing that you have done? Does not have to be technical.
Q1: Two light bulbs connecting in series, which one would glow brighter?
ANS: Using P=VI= (I^2)R to tackle this.
Q2: A pnp transistor with its base connected to a voltage source, the V source is connected to a +10V source. The emitter of the transistor is connected to a resistance, and then to the same +10V source. The collector side is connected to a capacitor, which is not charged at t=0-.
Given the graph of Vsource = 10 V stepping up at t = 0 to further, draw the graph of Vout. Vout is between the point of collector and capacitor.
ANS: Vout should be constantly -10V until t=0, and will hit V=0 V linearly from V=-10 V after t=0.
This question is exactly the same as one person had almost a year ago. I really hope that I looked into more of his question before I went to the interview. I took quite an amount of help from the interviewer to solve Q2.
Overall, having a good night sleep is very important before any interview. I have not heard back from them, but I think that it is great to share my experience with others.
Interview Question – Q2: A pnp transistor with its base connected to a voltage source, the V source is connected to a +10V source. The emitter of the transistor is connected to a resistance, and then to the same +10V source. The collector side is connected to a capacitor, which is not charged at t=0-.
Given the graph of Vsource = 10 V stepping up at t = 0 to further, draw the graph of Vout. Vout is between the point of collector and capacitor. View Answer
Electrical Engineer Internship Interview (Positive Experience; Average Interview)
I applied through college or university and the process took a day - interviewed at Lutron in November 2010.
Interview Details – Applied through university career services. Interview lasted for an hour, first 30 minutes behavioral questions, and the last 30 minutes, technical questions. Follow up emails resulted in no response from interviewer. Did not hear back till about 5 months later.
- What would be the current response of a RC circuit? How could you speed up or slow down the response? Answer Question
- If you have a room with 3 bulbs connected to 3 switches outside the room, how would you figure out which switch corresponds to which bulb if you are only allowed to go into the room once. You are not allowed to use any external equipment? View Answer
Innovation Leadership Program 2014 - Project Electrical Engineer (Analog) Interview (Positive Experience; Difficult Interview)
I applied online and the process took 1 week - interviewed at Lutron in October 2013.
Interview Details – I applied for an internship last year, but didn't hear anything back. A few months ago, I got an e-mail from Lutron asking me to submit my resume for full-time as I am graduating in December. I sent them my resume and promptly received an e-mail asking for a phone interview.
The phone interview wasn't bad. The interviewer went to the same college as I did, so it was easy to build a strong rapport with him. Technical questions were pretty basic: RC circuit, dc-dc converters. I received an e-mail two days later requesting an on-site interview.
About a week later, Lutron flew me out to the Bethlethem, PA area. I have to admit that I hated it there, but that's irrelevant.
The interview started early in the morning. It began with a 30 minute "HR" - type interview in which I could tell the lady didn't care at all about what I was saying. Next was a panel interview where I basically got drilled with technical questions for about an hour and half. The questions ranged from basic light bulb circuits to RF applications to circuits with floating nodes and BJTs. The guys that interviewed me were constantly asking me to second guess myself (whether I was right or wrong). It made me nervous, which was annoying, but that's what they want to do---to see how you react.
After the first panel interview was another. This one was more of a brainstorming one. The interviewer and I designed a kite-flying competition, and he asked me to come up with ways to measure the height of the kites for about an hour. It was more laid back than the first interview, but still uncomfortable.
After this, I went to lunch with a young engineer at the company. If you happen to interview with Lutron, remember that even though it is not explicitly stated, you are still be "interviewed" during this time frame. She and I had a nice conversation and shared some laughs, although I remained professional the whole time.
The original schedule said I was to resume interviewing after lunch, but I didn't. The HR woman said I was done, and she called the driver to take me to the airport. I'm not sure if it's that they knew they didn't want to hire me or if they just didn't have anyone else to do the afternoon panels. The other interviewee that had rode with me to the airport in the morning left at the same time I did, so it could have been for either reason.
They said they would get back to me within a week or two. They contacted me exactly one week later to tell me that I did not get the position.
Interview Question – Derive Friis transmission equation. Answer Question
Innovation Leadership Program 2013 - Project Electrical Engineer (Analog) Interview (Neutral Experience; Average Interview)
I applied through college or university - interviewed at Lutron in February 2013.
Interview Details – It was the phone interview and it begun with about 15 minutes general question such as why do you choose this major and then straight to the technical question. It begun with a brain teaser, which is a three light bulb problem. Then a question about how do you obtain and utilize a DC voltage when the input voltage is higher. They will keep asking until they get the answer they want, which is regulator
Interview Question – The question goes as your answer goes, which is that the question might be based on what your answer is. Answer Question
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