Help with 2330 lv 2 203 assesment please

[apollo1979]

Hi,

I have done my 2330 lv 2 204-206 assesments along with the 203

I passed them all except the 203

Having waiting 6 weeks for the results the part of the test i failed has gone out of my head

Looking at the notes and course material i have it doesnt include anything that will help me revise

I know that the bit i failed had not really been touched upon during the training

the section i failed is where you need to take a reading from a circuit then calculate the impedance or at least i think it was that you are given a formula to use but having not really done more then 10 min in the class room it has me stuck

Has anyone done this exam and know how to do it?

i have my re-sit this monday only booked it friday when i got my results!! need to get it passed ASAP so i can move on

Thanks for any help anyone can offer

Stressed
Rob

 

[BlueToBits]

Take 4 cups of coffee and a redbull 6 pack into your room and calm down.

 

[KFH]

I think we need a bit more guidance about what it is you want. Is it Zs= (R1+R2) + Ze?

 

[apollo1979]

I think its the Z= sqrd R2+ (Xl+Xc)2

But like i said it was a while ago and it wasnt made clear which bit i failed and i just can remember how to do it at all and cant find anything to revise with

the exam was the one where you have a little circuit ( kind you had at school) you take the readings U/I but them into a table then use the above formula to do a calculation for impedance the one where you have to square root a couple of times

and to be honest we wasnt tought this and it was never mentioned so when it came up on the exam it was a suprise to everyone sitting it,

I didnt get my results till friday just gone and re-sitting it monday so its a bit of a panic

Rob

 

[ebow72]

I am just off out to the gym, but give me a couple of hours and I'll go through it with you. I have just completed my level 2. So it's all fresh in the mind...

 

[ebow72]

are you after XC and XL formulas?

 

[gooner1984]

hi mate look like your talking about impedance in series, if so the formula is Zs=R2+X2 or R2 + X2 square root is that what your after

 

[ebow72]

I am not 100% what you are after, but if it's this Inductive Reactance XL=2pifl (2 x pi x frequency x inductance)
Capacitive Reactance XC= 1/2pifc (1 divided by 2 x pi x frequency x capacitance)
Total Impedance Z= Square Root of R2 + XL2 or XC2
For Combined circuits Z=Square Root of R2 + (XL-XC)2 Enter the largest value first of (XL-XC)
Power Factor is Z divided by R.
These are questions I had in my 203, I can help more, but need specifics if you could..
I hope this helps

 

[apollo1979]

Hi Ebow,

I think its this one For Combined circuits Z=Square Root of R2 + (XL-XC)2 Enter the largest value first of (XL-XC)
Power Factor is Z divided by R or this Total Impedance Z= Square Root of R2 + XL2 or XC2

Like i said i just cant remember i need to know how to do it lol

thanks again and thanks to everyone else

Rob

 

[ebow72]

This is a question we used get in our mock exams leading up the to actual exam.
A single phase AC circuit consists of a Resistance of 20 ohms resistor and an Inductive coil of 0.1h connected in series. A voltage of 230v at 50Hz is applied. FIND A) Impedance B) Current C) Phase Angle D) P.D across Resistor.

Is this anything like what you are after? This is all to do with Leading, Lagging and IN Phase loads.

If there is out else let me know.

 

[apollo1979]

What we have is an actual circuit set up we take 2 readings U & I

then use the formula to work out the impedance think its the 203 i did the 203 ,204,206

see the collage isnt clear and seem to rush through everything not had a problem though up to now

 

[ebow72]

Are you on about this http://www.electriciansforums.net/e...ical-exam-fluorescent-3-phase.html#post282211

I'm getting confused now Apollo...

 

[plasterite]

Im on one of these so called courses, They teach you to pass the exams they don't seem bothered about teaching electrical installation

 

[apollo1979]

Are you on about this http://www.electriciansforums.net/e...ical-exam-fluorescent-3-phase.html#post282211

I'm getting confused now Apollo...

Seems its different maybe it changes between collages?

the 3 phase i did was a motor
so not that one

i am confused aswell .....i tried to find out more but talking to several different people about what i actually failed and got a different answer each time

 

[apollo1979]

Im on one of these so called courses, They teach you to pass the exams they don't seem bothered about teaching electrical installation

yep thems the ones i am working with a proper spark starting in a week so will get as much experience as i need,
These courses are ok i guess but they dont really explain when you get stuck

feeling a bit fed up with them to be honest