Forum Posts

airobotoedu
Feb 26, 2022
In General Discussion
Rivian – Senior Robotic Engineer for Manufacturing – Palo Alto, CA Could you design an automation system to automatically process the wiring harness? What are the procedures to achieve that? Traditional car markers like Ford, Honda have a rigid rule to standardize automation designing and implementation. Can you do it without those standards? How could you do that?
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airobotoedu
Feb 26, 2022
In General Discussion
Tesla – Equipment Engineer for Gigafactory – Reno, NV What is the difference between Safety Relay and Regular Relay? Safety relay is more like a switch or power relay, it will cut off power if over current or e-stop pressed. It can be recovered easily Regular relay is a signal transmitter What is the difference between Safety PLC and Regular PLC? Regular PLC is describing connection between input and output signal. There is a action sequence or control logic to connect input and output Safety PLC is a monitor system to monitor the door closed or if e-stop closed. There are redundant input and redundant output for double check if everything is OK New servo-drive, it moves and stops with crazy noise and jerky to move, how would you check and troubleshoot this issue? VFD over-current, how would you troubleshoot it? How do you tune the servo-drive, homing, moving? Tesla – Senior Design for Manufacturing – Automation System – Fremont, CA How to design a motor with reverse function without using VFD? Contactor to switch two of three legs for reversing Interlock for all three legs connected at the same time How to configure a servo drive? How to write programming, motion profile, for two axes of servo motor, such as gantry system picking pallet from A to place at B? How about one axis? What command do you use? (Rockwell or Siemens PLC) What is the difference between PNP or NPN sensors? Which is the source? Or Sink? Google Search Panel design: what is the gauge standard for wiring? Do you know the safety standard calculation, such as the “rsv” code? How to calculate the maximum current or voltage? Do you know about I/O links?
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airobotoedu
Feb 26, 2022
In General Discussion
ABB Robot – Chicago – Product Development Do you know how to make C++ programming? Or do you have relevant working experience in C++ developing? Tesla -- Robotic Automation Engineer for Manufacturing – Fremont, CA What are the singular points for the robot? Where are they? The 3D space points where the robot controller cannot get the solution from matrix calculation. a. The center point of arm ending is above the center point of robot base b. The robot arm is stretch out in a straight line What is the difference between Profinet Protocol and TCP/IP Protocol?
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airobotoedu
Feb 26, 2022
In General Discussion
Tesla – Mechanical Product Design in Crashworthiness Department There is a car staying before red light in a crossing. Another is coming behind and the brake does not work to reduce the speed. Then, the car behind crashes the car forehead. Which car’s seat belt receives more stress? Please explain why? (Assume every person in each car is wearing the seatbelt and the seatbelt inside the same car receive the same stress. Also, both of the two cars have the same mass and mechanical setting.) The seat belt in the rear car receives more stress than the front car. Because, the amount of speed reduction for the rear car is larger than the increment or decrement amount of front car speed. There is an ECU (electronic control unit) for the airbag reaction system. It keeps collecting data from acceleration and pressure sensor to determine if it necessary to start inflation of airbag. Do you know what is the reaction time or time of delay for ECU when it find the situation to start inflation process? There are 3 options and please explain why? 0.1 seconds 0.01 seconds 0.001 seconds Answer should be b. It is an approximate value. The 0.1 seconds is too slow and cannot capture the crash event in time. The 0.001 seconds is too fast and will cause too much non-effective workload on ECU. Mathworks – Application Engineer (more like control engineering) 1. Do you know what is the criterion of controllable for controller matrix design?
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airobotoedu
Feb 20, 2022
In General Discussion
o Basic attention to details: " Can you tell me a bit about your current role? " How would your current or former colleagues describe you? " Good Answer: hard working, meticulous, persistent " Do you think you have attention to detail? " Good Answer: Yes, with examples that demonstrate understanding and depth " Bad Answer: No or wishy washy answer with lack of understanding/depth " Can you give me a couple examples where your attention to detail comes into play in your current role? (ask a few follow up Qs based on responses) " Good Answer: Organization, confirming every detail, proofing and double-checking, taking time to ensure accuracy " Bad answer: Examples that don't display attn to detail " How do you stay organized when you have many competing priorities? " Good Answer: task management, making a hit list, taking projects one at a time, logical approach " Bad Answer: Lack of logic, expression of overwhelm when work load is seemingly light Desire to solve problems: " Can you tell me about a time when you ran into a roadblock at work? What did you do and what was the outcome? " Good Answer: Problem solved, tried different approaches, persistence, asked questions " Bad Answer: Apprehension to ask Qs, frustration, blaming others " Can you tell me about a time that you felt really successful or accomplished at work? " Good Answer: Achieving a team goal, giving others credit where due, learned something " Bad Answer: No example, selfish focus " Can you tell me about a time when you were really frustrated at work? " Good Answer: genuine example, worked through " Bad Answer: blaming others, eye-rolling o Company culture and role fit: " What excites you about our company's business and this role? " Good Answer: interest in the business, passion for improving/growing our business, desire to learn " Bad Answer: lack of excitement, excitement for responsibilities NOT included in the role " In what you've learned so far about the role, do you have additional questions you'd like to ask? " What do you want me to know about you that I might not have asked? Tell me about a time you have been stressed/overwhelmed. " Good answer: demonstrates self awareness. " Bad answer: stressed by too much work, ambiguity, lack of strict guidance (e.g. written docs). o What was a project you had where instruction was unclear? How did you make decisions in this situation? " Good answer: shows logic and thoughtful approach. " Bad answer: can't verbalize thought process. Decisions were arbitrary, lacked logic. o When have you had the most work to juggle? i.e. what are all the things you had to do. What factors helped you decide what to prioritize? " Good answer: large workload, logical approach. " Bad answer: intentional decision making is not apparent. Lack of logic. Workload is relatively small. o Tell me about a time you made a difficult decision not to do something. Why was it hard? " Good answer: Demonstrates what is logical/practical over what is desired. " Bad answer: Conveys combativeness, lack of flexibility. Irrational. o Tell me about a time you created a way to do something much more efficiently than it had been done before. " Good answer: Novel, impressive idea. Demonstrates inherent seeking for improvement. " Bad answer: Non answer, not novel. o What is something that really impresses you about your current/last company? " Good answer: Involves sharecropper's value (e.g. impactful work). Shows genuine interest. " Bad answer: Is surface level, difficult to think of, negative. o Self-awareness: Tell me about a time you disagreed with a team member " Great answer: Listened, tried to see it from their perspective, tried to get a 3rd party's perspective, tried to appeal to common goals, etc. " Bad answer: I just overruled the person, I did it anyway, I did it myself o Communication: Tell me about a time you received feedback from a team member or colleague that you disagreed with. " Great answer: Adjusted my style. Behavior or communication change. Try to get to root cause of the issue. Think about implications of what they are saying. Talked to them. " Bad answer: Ignored it. Overruled them and went to their / my manager. Did not talk to them about it.
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airobotoedu
Feb 20, 2022
In General Discussion
Machine Learning Concept content media
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airobotoedu
Feb 20, 2022
In Questions & Answers
Algorithms: Support Vector Machines, Regression, Naive Bayes, Decision Trees, K-nearest Neighbor Algorithm and Neural Networks E.g. If you built a fruit classifier, the labels will be “this is an orange, this is an apple and this is a banana”, based on showing the classifier examples of apples, oranges and bananas.
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airobotoedu
Feb 20, 2022
In Questions & Answers
Algorithms: Clustering, Anomaly Detection, Neural Networks and Latent Variable Models E.g. In the same example, a fruit clustering will categorize as “fruits with soft skin and lots of dimples”, “fruits with shiny hard skin” and “elongated yellow fruits”.
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airobotoedu
Feb 20, 2022
In Questions & Answers
What are the various algorithms? content media
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airobotoedu
Feb 20, 2022
In Questions & Answers
Naive Bayes methods are a set of supervised learning algorithms based on applying Bayes’ theorem with the “naive” assumption of conditional independence between every pair of features given the value of the class variable.Bayes’ theorem states the following relationship, given class variable y and dependent feature vector x1 through xn: Using the naive conditional independence assumption that each xi is independent: for all i, this relationship is simplified to: Since P(x1,x2,…xn) is constant given the input, we can use the following classification rule: and we can use Maximum A Posteriori (MAP) estimation to estimate 􏰨(􏰩) and 􏰨(􏰩|􏰣􏰦); the former is then the relative frequency of class 􏰩 in the training set. The different naive Bayes classifiers differ mainly by the assumptions they make regarding the distribution of 􏰨(􏰩|􏰣􏰦): can be Bernoulli, Binomial, Gaussian, and so on.
What is ‘Naive’ in a Naive Bayes?  content media
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