Recent content by CLTEE49

Has anybody gotten a Project Management Professional Certification? What do you think about the courses/exam? I am thinking of doing an online course program which is much cheaper than the brick and mortar classes offered at the local university. All classes and material are certified by the...

I dont think its officially official until you receive the letter. I want something I can take to court and I cant take a screen shot to court.

Some of you people are creepy.

Am I the only one that wishes we kept a new thread for the spring results? I just dont feel right building on last falls accomplishments. Sorta gives me a bad mojo...

I had a guy in my office taking the surveying test from South Carolina come in an say he got his results over the weekend. Thats what made me come on here and check today.

bump.... has anyone gotten results? The current count is at 36735 Kenneth Zur I swear it was around 36377 in January.

Also in this problem I am unfamiliar with ther terms "fault duty" and "X/R ratio". Apparently fault duty is the same is MVAsc. When I first saw this I thought since the transformer and the system have the same X/R ratio that the system would also have a 4% impedence. What if the ratio was...

I thought the constant/core/no load losses in a motor (the eddy and hysterisis losses) were imaginary. These are added to the I^2*R losses to get the total power loss. If you reduce these constant losses that improves the power factor and increases efficiency.

So power factor has nothing to do with motor efficiency... at least not in the first order.

Kaplan gave a good explanation of rectifiers in Chapter 14. The diodes turn on when voltages are positive. I normal three phase rectifier looks like answer (A). You will see a peak when the current in phase a is positive and either the current in phase B or C is also positive. You will see a...

Ive found Camara EERM Chapter 41 and the NEC Article 280. They answered my questions.

Ive seen questions like this relating to the motor efficiency. Just so Im correct - I want to verify that... Improving the power factor to the motor (with a parrallel capacitor) does nothing to the power output of the motor. Thus the power factor of the system improves - power to the motor...

This may not be a good place for this but I didnt want to start another topic. When you are given a variable MVA transformer (30/40/50MVA) with a transformer impedance (say Xs = 10%), how do you go about calculations for the line? Do you look at it as a 50MVA xfmr? You can change it to any...

Anybody know anything about Lightning and Surge arrestors? Let me see if Ive got this right, a lightning arrestor is chosen based on the system voltage (MCOV) and anything above that voltage gets diverted to ground... correct? I just dont see how you can choose a lightning arrestor based on...

I would classify problems such as "annual cost of a light bulb" as engineering economics. Its not just questions using the % interest tables.