homework check in

here is a link to use until we get the homework check in sheet ebedded in the new website


https://docs.google.com/spreadsheet/pub?key=0AmYZn4NIn6XQdDlaY0RFWm01MFZGNl9FSXMyaFNYUFE&output=html

Greg McMurphy
Instructor
LU112-NECA Electrical Training Center
Kennewick, WA 99336

Another 4th year Question

here is another 4th year question that you might all be interested in getting the answer to:
In the torque equation T=HP÷rpm×5252 . Where does the 5252 come from in the equation?
Well.....
since there are 550ft-lb per second per horsepower, and 60 seconds in a minute going from HP and RPM to foot pounds will involve using the 550 and 60, multiply that out and you get 33000.  Since we are talking angular motion (RPM) and not linear motion there is a conversion going on.  Remember that circumference = pi*D?  and since D=2r we can throw 2pi in to convert our angular speed to a linear speed at a given radius (in this case 1 foot). Put 33000 in your calculator and divide by 2pi (6.28 approximately) and see what you get.

for more info see http://en.wikipedia.org/wiki/Torque down near the bottom of the page.

Greg McMurphy
Instructor
LU112-NECA Electrical Training Center
Kennewick, WA 99336

4th year motor question

A question came in as a review question that might be of interest to the whole group.

Is the correct answer to q. 5 of lesson 11 A: 1/4 hp? All I could find in the text was that other than fractional HP motors required reduced starting applied to DC motors in order to prevent motor damage. pg.244 Motors Text. Does that mean .9 hp does not require reduced starting but 1 hp and above does making option B: 1 hp the wrong answer to q. 5?

My answer is, you are right in that "other than fractional" require reduced voltage.  So since 1/4 IS fractional and all the rest are NOT, and since 1 hp is the first size that is NOT fractional, I think b. is the answer.  I assume the last sentence in the student's question is worded backwards from what was intended.


Greg McMurphy
Instructor
LU112-NECA Electrical Training Center
Kennewick, WA 99336

Fire Alarm

Hey Gang,

You will be very happy if you remember to bring orange, green, and yellow highlighters for use in class on Monday of your next week of school.  We will be codeologizing the NFPA 72 2010.  We will also be tabbing the document as well.  Hope you are all doing well.  We are looking forward to seeing you in 3 to 4 weeks!!

Greg Greiner

LU112 NECA JATC

Instructor

greg.g@jatc112.org

Test Instrument Application Manual

4th year-
Hope all is going well with you, we ran across a tidbit of information that might prove helpful and we thought we'd share.
On a general note, the Test Instrument Application Manual is a companion to the Test Instruments text book, so if you find the application manual asking you questions that you don't understand how to answer take a look in the text.  One specific example of that issue is found in the work for this week of school.  You are asked to calculate voltage unbalance in a motor circuit and then say if that number is acceptable or not.  Take a look in the text, check the index for voltage unbalance calculations, and you will get the information you need.

The two motor tests deserve your full effort and attention.   If you have questions as you prepare for school please bring them up.
Greg M

FIFTH YEAR WEEK 1

Week 1 is over for 5A, only 4 more to go!!  We ran in to a couple of questions in the homework that needed clarification, but no one noticed it until the week of school. Please ask your questions as you do your homework and the week of school will be more productive.  FYI fourth year people... in lesson 8 of the PV workbook there are questions which come out of chapter 11 of the text even though it isn't given as a reference.

Fraternally,
Greg McMurphy

Incentive

The first two apprentices to comment on this post will get a free drink of their choice at Mad Munki Espresso in Kennewick.
Greg McMurphy
Instructor
LU112-NECA Electrical Training Center
Kennewick, WA 99336

Homework Check in and Orientation Night

It is a busy time of year as we prepare for the next year of school, hopefully you all are keeping cool out there in the field.  Homework check in's for all five years seem to be going ok, we are having very good participation and some encouraging comments from apprentices.  If you have any problems with finding the website while you are out of town remember that you can call in, send an email or text if necessary.

First year orientation night is next week, an exciting beginning for 20 new apprentices.  There is a ton of great information that we will give out free of charge along with the book packages so don't miss it.

Greg McMurphy
Instructor
LU112-NECA Electrical Training Center
Kennewick, WA 99336

First Year Orientation Night August 23

Thursday August 23 is First Year Orientation.  Show up at 6 pm fed and ready to get your books and LOTS of information.  You need to have a check or money order for books and tuition or PRIOR arrangements for payment need to be made.
SEE YOU THERE!


Greg McMurphy
Instructor
LU112-NECA Electrical Training Center
Kennewick, WA 99336

Book Pick Up Day and Hands On Testing

Hope you all are having a great summer!
Hands on testing is going well, the average score for level 3 and level 4 is out the roof this year.
I think the book pick up day was a success, we had a lot of information to get across and I assure you it was much more consistently communicated with you all in the room at once as opposed to coming in throughout July and August randomly.  YOU being there rather than sending someone to pick up books will turn out to be an improvement I believe.  Time will tell. Give us some feedback and let us know YOUR impression.
Greg McMurphy
Instructor
LU112-NECA Electrical Training Center
Kennewick, WA 99336

PV terminology

We had a question about what terminology to focus on for the PV section.  If you look at the text book definitions for Chapters 1, 2, and 3 you will have a great idea of what is coming up.  There are a lot of words but they aren't all new.  The chapter summaries do a good job of hitting the high points.

Fraternally

Greg McMurphy
Instructor
LU112-NECA Electrical Training Center
Kennewick, WA 99336