Failure

[Simonslimline]

Worth a read mate.



electric motor :: Capacitor induction motor -- Encyclopedia Britannica

 

[Silly Sausage]

Single-phase induction motors : Ac Motors

http://electroniclevel3.wikispaces.com/HRC+Fuses

 

[Simonslimline]

Heres a diagram for the Fuse

 

[dazza1981]

Heres two question i struggled to even answer.

Explain how the split phase effect is achieved in an induction start single phase motor?

Provide a diagram & describe short circuit on a HRC cartridge fuse.

Ermmmm..... Ermmmmm...... dunno next question. pmsl
I have forgotten most of this stuff now since leaving college and that was just a few years back.
:yawn:

 

[Poult12]

Si have you looked on that website yet? Remember the one where a bloke came in to chat to us about it?

 

[Silly Sausage]

Ermmmm..... Ermmmmm...... dunno next question. pmsl
I have forgotten most of this stuff now since leaving college and that was just a few years back.
:yawn:

I used to forget everything over the summer holidays!

 

[Poult12]

I used to forget everything over the summer holidays!

Without a doubt the most hardest thing to do is getting back into the swing of it after term breaks!! Memories like a Siv!

 

[Simonslimline]

Si have you looked on that website yet? Remember the one where a bloke came in to chat to us about it?

Yeah, i am pretty sure it wouldn't let me watch some stuff last time i looked.

Not even sure where my password is now TBH mate.

 

[jaymd]

We have those questions last year when I was doing 2365 level 3. Surely it's not the same paper?

 

[Poult12]

Quite possible...

Next bit is - i dont understand Star n Delta.
Tried multiple times to get my college tutor to go through it more but just doesnt seem to get round to it.

Without sounding like an absolute idiot - this may need spoon feeding.

 

[shanky887614]

have a look on swindon massive website. I used this a lot when I did my 2330

www.swindon-massive.co.uk/electrical/revision/2360pt1/assessment_choices.html

 

[shanky887614]

Quite possible...

Next bit is - i dont understand Star n Delta.
Tried multiple times to get my college tutor to go through it more but just doesnt seem to get round to it.

Without sounding like an absolute idiot - this may need spoon feeding.

I would recomend you buy the linsey book for your course


this explains the difference between star and delta

www.reuk.co.uk/Star-Delta-Wiring-for-Alternators.htm

 

[Baker1988]

don't feel bad mate we did the 309 written 2 weeks ago at my college and only 8 people out of 68 passed mate and the highest score was 66% which was my score, some of the questions we had not even covered it was a bit of a **** up mate just keep revising mate get a few mock exams and you will be fine

 

[Simonslimline]

Quite possible...

Next bit is - i dont understand Star n Delta.
Tried multiple times to get my college tutor to go through it more but just doesnt seem to get round to it.

Without sounding like an absolute idiot - this may need spoon feeding.

With Star the Line voltage is 1.732 x the Phase voltage. So Phase to star point voltage is 230v. Multiply the 230v by 1.732 and that gives us the line voltage of 400v. (VL = 1.732 x Vp). The Phase current and Line current are the same in Star so (IL = Ip)


With Delta the Phase voltage and the Line voltage are the same so (VL = Vp). The Line current is 1.732 x the Phase current so (IL = 1.732 x Ip)