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Lutron
Innovative Leadership Project Electrical Engineer 2014 (Analog) was asked...November 21, 2013

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.

3 Answers

I just made it back from Lutron's HQ and I was asked for the same question. My first approach will be identifying a PNP BJT, and elaborating all 4 BJT operating regions. Before t = 0, since q = 0, by using Q = CV, we can tell that the voltage across the capacitor is 0. Hence, Vo = -10V before t = 0. Recall the capacitor's current equation: I = C*(dv/dt), we can solve for the slope of changing voltage -> dv/dt = I/C. Here, I is simply the BJT's collector current, which can be found by looking at the BJT's emitter current. Given that the (beta) parameter is infinite, we see the base current to be 0. Now, at this point, we need to look for I_E. Since the R is given to be 9.3k, and VEE = 10V, it is natural to assume V_EB = 0.7V, and thus the voltage across R = 9.3V. Therefore, I_E = 9.3/9300 = 1mA. Voila, we now values for all currents: I_E = I_C = 1mA, and I_B = 0A. Plug the I_C value into the equation: I_C/C = dv/dt (C = 1uF). We know that the slope of the voltage change is 1000V/second, or 1 Volt per millisecond. Now, we know the capacitor voltage raises at 1V/ms from -10V, but we also need to know where is the upper limit. Looking back to the BJT basics about operating regions and BJT's 2-diode model, it is not hard to identify that this PNP BJT must operate in "Saturation" region (NOT IN "ACTIVE" REGION!). The boundary of that region is V_BC <= 0.7V (I hope everybody is able to solve for this). Hence, 0.7V will be the upper limit for capacitor voltage. At this point, you will have a flat line at Vo = -10V before t = 0. and raises at 1V/ms for 10.7ms and hit Vo = 0.7V. From t = 10.7ms and on, the Vo stays at 0.7V. Less

ANS: Vout should be constantly -10V until t=0, and will hit V=0 V linearly from V=-10 V after t=0. Less

Hi, Can you explain why it linearly increases? Are you assuming that Collector is tied to -10V? The pnp transistor is completely cutoff for the given biasing. The only way the capacitor is going to charge is through leakage currents. It is very slow and takes a lot of time. Please advise me if my analysis is correct. Less

Bell Canada

Why bell? Any obstacle in your career? Strength?

188 Answers

What?? That's a bit unfair I graduated this year and I didn't get any group interview opportunity yet. That's a bit frustrating to hear. Less

What are they asking in group interview?

I feel like getting an interview is also dependent on luck. Its seems like you have a good background for a new grad position. Also did you make sure you didn't get your bachelors prior to 2019 since you did a 2 years masters? I believe that was one of the requirements for Bell GLP. Less

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Acosta

Just entertain me for five minutes, I'm not going to talk

42 Answers

Great! Let me walk you through my resume, my experience and my qualifications for this position. I must admit, this will be a refreshing change of pace where I can complete my train of thought. I appreciate your silence. I can answer any of your questions after I finish. My career objective is........... In other words, use this time for your personal sales pitch! Less

I am not going to talk either. The entertainment will be to see how much we can communicate with each other using only gestures, facial expressions and body language. Go! Less

Thanks for your time.

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Bell Canada

Why bell?

22 Answers

In Bell portal, the statuses of all three applications I submitted are "In progress" Less

Which one did you apply to? BI or Network?

I applied for Network, Ontario

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Aramark

what are your strengths/weaknesses what appeals to you about the career track you are interested in?

22 Answers

I received an offer today via phone. She gave me a lot of information about the job, salary, location, ect. My official offer will be emailed to me tomorrow. Less

What is the average salary for the program?

Just as a heads up for everyone, just because you are eligible for the program doesn't guarantee you a job. They only take on 400 A2L's per year, half in February and the other half in July. There are a lot more people accepted into the program, and then they decide from there who gets the jobs based on job and location preferences. I know some people who waited 3+ months after to hear back after receiving the "eligible email". Source: Current A2L Less

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Axon

How many snow shovels sold in the US last year?

18 Answers

There are roughly 400 million people in the US About 100 million people live in areas where having a snow shovel would make sense (NY and Pennsylvania are large) A snow shovel likely only needs to be replaced every 10 years 100/10 = 10 million The average home size is ~2.5 10/2.5 = 4 million homes each home likely has about 1.5 shovels on average 4*1.5 = 6 My educated guess would be 6 million (although my intuition is this is a little high) Less

Greater than the number of Tasers

All of them. Every single one that was purchased.

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Bell Canada

How did you prepare your interview? Describe your customer services experience.

17 Answers

Hi Everyone, I had the same situation. Just got email that application moved to next round. Please stay in touch and share your experience. Thanks Less

I think I waited for more than 10 days.

I gave the video interview on 30 sept. No response as of yet. Has any of you guys received anything? its a bit frustrating. Less

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PMG Digital Company

When is a time you used data

12 Answers

Same here. I am still waiting to get a response.

It's been a week since I did the one-way interview, still waiting to hear back as well. Less

I got the invite for the next round 2 weeks after one-way interview.

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U.S. Bank

How are M&M's made?

11 Answers

When a Mommy M and a Daddy M love each other very, very much.... Seriously, they make the chocolate first, cool it, separate them into their smaller spheres, then put into Panners where the sugar layers are added, dyed the different colors, then waxed (no kidding, very thin layer though). Then they go down a conveyor belt to get the M stamped on them. Less

I said that the chocolate was solid and then dipped into the candy shell

They use hybrid dung beetles to roll the balls in candy coating! Going Green at M&M's Less

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Ryder System

Why would you like to work for Ryder?

9 Answers

Big company..like working in logistics and I am a leader.

I would like to be considered for a driving position in your company

By giving him five gallons of fuel

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