Jump to content

All Activity

This stream auto-updates     

  1. Past hour
  2. Today
  3. Yesterday
  4. Last week
  5. Power factor is the cosine of the angle between the voltage and the current. It is the third factor in the product that expresses the power, P = V*I*cos(phi) where phi is the phase angle. DrD
  6. Real power is just what it says, power as in work done per unit of time. In electrical systems, the real power is calculated as Preal = V*I*cos(phi) where V = voltage I = current phi = phase angle between current and voltage Reactive power is Preact = V*I*sin(phi) I've never heard the term "apparent power" but I suspect what you mean is what I know as Volt-Amperes = V*I The real power is the in-phase part of the volt-ampere product while the reactive power is the out-of-phase part of that product. DrD
  7. Ths is done to reduce eddy current losses by preventing current flow perpendicular to the laminations. The laminates are electrically insulated from each other (usually by varnish) which blocks current flow while allowing magnetic flux to flow freely. DrD
  8. This process is called "field weakening" and it was used for speed control on the ancient rolling mill where I worked long ago. As the field current is reduced, flux must be cut more rapidly to maintain the back EMF. The only way this can happen is for the rotor to turn more rapidly, thereby cutting more flux per unit of time. DrD The term "linear machine" seems ambiguous to me. I think you intend to describe an electrical machine (motor) described by linear differential equations. The term can also be used to describe an electric motor for which the moving element translates rather than rotates. For a translating induction machine, the usual acronym is LIM, Linear Induction Machine. Such machines can also be built in synchronous form, known as LSM, Linear Synchronous Machines. The linear machines of this sort are being used to launch aircraft from aircraft carriers. DrD
    I hope that a great many folks will download this file. It is better than that previously posted, and probably my last effort. It is not yet available at Lulu.com, but I hope to eventually make that happen. It seems inappropriate to rate my own book, but it is required by the website. DrD
  9. Okon, I'm not sure I can answer your question fully, but I will try to give you some hints. First, we refer to "brake" (to stop a vehicle), not "break" ( to disconnect or to come apart). Second, the brakes should work properly with or without ABS operating. ABS will try to correct for one or more wheels sliding while braking in order to maintain steering control. You could have one of several problems: 1) air trapped in the brake lines - will make the pedal feel "spongy". Bleeding the brake lines is a tricky job best left to an expert mechanic. 2) faulty master cylinder - this is the heart of the system - when you press the brake pedal, you develop pressure that is distributed to all four wheels. If the master cylinder leaks, you could get good pressure when you first press the brake pedal, and then lose pressure as you hold the pedal down. If that were the case, your ABS would not work well either, because it relies on the master cylinder to maintain pressure. Finally - one or more wheel cylinders (that actuates the drum or disc) could leak - this might cause similar issues as faulty master cylinder. ( Look up "Hydraulic brake system" online to see a diagram of the system and to understand how the parts interact). You do not state how many miles are on the vehicle and the brake system. If it is a high number, the brake wear may have allowed the wheel (piston) to extend to a part of the cylinder which is not worn as much, or corroded so that the hydraulic seal is not good. If you have installed new discs or drums, you might have to rebuild the wheel cylinders. This is not a fun job, but it is something you can do. Check internet for instructions.. The important thing is to keep everything VERY clean. you do not want any dirt particles in you brake system. After rebuilding wheel cylinders, you will have to fill and bleed the system with new brake fluid. I hope this helps
  10. Earlier
  11. In the word fluid there are two things one is liquid and second is gas. So if temperature is increase for liquid then viscosity is decreased and for gas it will be increased because fast movement of elements.
  12. Assembly Planning engineer Job DME with 10-12 years exp/BE Mech with 5-8 years Exp Skills & Experience: Assigns daily production schedule to ensure that production builds are met. Work with engineering & quality teams to identify,troubleshoot & resolve the production problems. Responsible for inventories and requisition for materials and goods. Minimise waste and cost and ensures conformance to safety & quality standards. generate new ideas & implement changes in processes and use of equipment to increase the efficiency. maintain cleanliness through good housekeeping practices. Keep track of group attendance on a daily basis. Responsible for safety on the assembly lines. Soft skills - ERP/SAP.Excel.word & power point. Interested candidate to send updated CV to avayakumarsahoo@gmail.com
  13. Explain what are the approach used in manufacturing for QA?
  14. Is there any quicker method of repairing composite components especially aircraft parts?
  15. Introducing Trust Me I'M An Engineer Tees Login between 8 to 10 Nov 2019 on engineeringtalks.com and a get a chance to win Trust me I am an Engineer Tees 5 Lucky winner from India will get Trust me I am an Engineer T-shirt You can also order the t-shirt from the following Link https://teespring.com/trust-engineer_eu_1 Only for Engineers and Engineering students in India Next time , we will have offer for other countries as well
  16. Deon

    About car break

    Please, my Toyota Tacoma Pickup MODEL 2006, Has breakfast issue for about 6months now. I change the ABS no solution, now I disconnect from ABS and made it a dirrect breaking system. It will hold at time the break will be free. Please, what will I do? Best Regards, E. Okon
  17. Autocad tutorials for d beginners and tricks behind fast design.
  18. Now that is an interesting question! Do you mean Ampere's circuital law? or Do you mean Ampere's force law?
  19. If the process is to compress and then cool (or heat ) the medium, then design the compressor first. Having done so, you should be able to estimate its flow rate and pressure rise, and, most importantly, the temperature rise. With that, you know the capacity of heat exchanger required.
  20. Hi, my educated guess would be in some long years... besides the tech challenge there's the legal one. BTW even for the prototype consider the weight of lights, wipers and stiff nets for people vs blade protection; (I wonder why there's no way to invert the gravitational polarity (in a controlled fashion), to stay off the ground) creating an antigravity field to bodies..... ; )
  21. Excellent work sir but on safety make sure about the propellers speed and weight carrying capacity and add a air bag in the passenger cabin and add sensor for the automatic control.
  22. Diploma Engineering from Government Polytechnic Latehar Jharkand.

    Pursing B.Tech Engineering from Ranchi University 4years

  23. super it's Good project for world wide, improve the flying height above 15 to 20 meters and added to the Airbag system for passenger safety, Navigation system and add Highly equiped sensors.All the best for this flying car project team.
  1. Load more activity

  • Create New...