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this (at least upon a quick reading) is a simple plug in the formulaequestion.
I suggest you visit (again) your library, as you're not getting muchco-operation
from us. [This was permitted (even encouraged) when I took take homeexams at
UCSB.]iron
hint: Harnwell has a section on the magnetic circuit and another on the
core transformer. I checked Bleaney and Bleaney -- has one page on MMF,worked
reluctance, etc.
bc
P.s. I see I miss-read you post, as did Ludwik. If you still can't find a
e.g., I may help you. However, this is sucha common problem, I amsurprised you
haven't found help in your text or another in the library. (Reitz andMilford
also discuss this problem.)Electronic
Ludwik Kowalski wrote:
Suppose I do remember how to solve such problems (I do not)
and post a solution. Would you present it to your teacher as
your own or would you give me credit for doing this for you?
Ludwik Kowalski
paul giusti wrote:
i am from Hamilton, near Glasgow and am at Strathclyde Uni doing
returnand Electrical Engineering. i have an exam on electromagnetism when i
i havefrom my holidays,hence why i cannot get in contact with my lecturers.
thebeen doing past papers, however i do not have any worked solutions.
previousquestion i have put on this e-mail is one that has appeared in
myexams however i cannot seem to do it or find anything in any books or
hope.notes to help me. sending the question to physics lecturers is my only
wound
thanks in advance
kind regards
paul
a transformer is constructed from E- and I-shaped cores with coils
andaround the center limb. the middle part of the core has length 25mm
eachcross-sectional area 160mm^2, with a mean flux path length of 50mm on
400side.
The relative permeability of the core is 1200. the primary coil has
primary.turns, while the secondary has 100 turns.
a) calculate the total reluctance, and the self-inductance of the
connected
b) if 240 V is applied to the primary and a load of 50ohms is
ofacross the secondary, determine the flux and flux density in each limb
if athe transformer.
c) determine the percentage drop in the flux through the centre limb
manufacturing fault leaves a 0.1mm gap between it and the I plate.
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