[chbot] Choc Fish Challenge #5

Mon Sep 5 00:00:21 BST 2011

yes
Got it to 2km after a double check.

I do understand the points raised re line loss etc.
Only comment is that this is NOT a paired cable, so in theory the 
resistance doesn't apply.
Also it was never specified what voltage the battery was (48 is 
available usually).

We'll take that under consideration for the 300 wire cable.

Mark

On Mon, 5 Sep 2011 10:50:32 +1200, Synco Reynders wrote:
> Hello,
>    To clarify the ends do not need to be undone, just labeled.
> Anyone able to beat 4km?? (since it is possible :-)
> /s
>
>
> On 5 September 2011 09:33,  <m.beckett at amuri.net> wrote:
>> Gents
>> We have had a hack at this at work.
>> We work out 4km required to label both ends.
>>
>> If you want the jumpering undone so they become individual, it needs 
>> a
>> 5th km.
>>
>> We can explain how, but its a long email, and the phones keep 
>> ringing.
>>
>>
>> Mark
>>
>>
>> On Sun, 4 Sep 2011 21:55:00 +1200, Synco Reynders wrote:
>>> Hi Mike,
>>> I see you're a fit (or going to be a fit) guy after doing this... 
>>> Cos
>>> the next job your the boss has is a 300 wire cable <very subtle 
>>> hint>
>>> :-).
>>> Nice try, but you may need a bit more optimisation.
>>> /s
>>>
>>> On 4 September 2011 21:44, Michael Field <hamster at snap.net.nz> 
>>> wrote:
>>>> I've made a start.... this is flawed (at the end of step 2 we
>>>> haven't
>>>> definitively identified the bundles at the far end) but might
>>>> inspire
>>>> somebody. My guess is that you need to use uneven wire counts in
>>>> each bundle
>>>> you can glean more information....
>>>>
>>>> But I'm pretty sure that the divide into three groups and wiring 
>>>> up
>>>> two is
>>>> the correct starting point...
>>>>
>>>> Mike
>>>>
>>>> First step
>>>> Separate the cables into 3 bundles of 40, short all cables in the
>>>> bundle
>>>> together Connect each end of the battery terminals to one bundle 
>>>> of
>>>> 40
>>>> (leaving one bundle unconnected).
>>>>
>>>> Walk to the other end.
>>>>
>>>> Connect light to a random wire, and try to get a circuit by
>>>> connecting to
>>>> each of the other wires. If nothing lights, try another wire.
>>>>
>>>> When you get a light, you will then be able to move one jumper
>>>> around to
>>>> find which 39 other wires are also in that bundle. Do the same 
>>>> with
>>>> the
>>>> other terminal of the bulb.
>>>>
>>>> You will then have three bundles of 40. One you will be know more
>>>> about
>>>> (it's not connected at the other end) but you won't know which
>>>> bundle is
>>>> connected to the positive terminal, and which is to the negative 
>>>> (oh
>>>> for an
>>>> LED or meter).
>>>>
>>>> Second step
>>>> For each bundle of 40, divide it into two sets of 20, and jumper
>>>> together.
>>>> Jumper two bundles of 20 from one of those connected to one of the
>>>> battery
>>>> terminals together, jumper each bundle of 20 from the unconnected
>>>> pair to a
>>>> bundle of 20 that is connected to the battery.
>>>>
>>>> Walk back to the other end
>>>>
>>>> Use the bulb in series with the battery to separate the starting 
>>>> end
>>>> into 6
>>>> bundles of 20.  you will also be able to work out which bundle was
>>>> connected
>>>> to which battery terminal, accurately identifying both ends of the
>>>> bundle.
>>>>
>>>> Label each cable.
>>>>
>>>> Step 3 & 4
>>>> Deal out the cables again 3 or 4 from each bundle of 20, into new
>>>> bundles of
>>>> 40. Repeat. The above process, walking another two trips
>>>> This will allow you to divide the cables into 36 bundles of three 
>>>> or
>>>> four.
>>>>
>>>> Step 5 & 6
>>>> Deal out the cables again bundles of 3 or for , into new bundles 
>>>> of
>>>> 40.
>>>> Repeat. The above process, walking another two trips
>>>> This will allow you to identify individual cables.
>>>>
>>>>
>>>> On 4/09/2011 7:48 p.m., Synco Reynders wrote:
>>>>
>>>> As I was pulling through some wires today I remembered this 
>>>> classic
>>>> challenge...
>>>>
>>>> A 120 wire cable has been laid firmly underground between two
>>>> telephone exchanges located 1km apart.
>>>> After the cable was laid it was discovered the individual wires 
>>>> are
>>>> not labeled. There is no visual way of knowing which wire is which
>>>> and
>>>> thus connections at either end is not immediately possible.
>>>> As trainee technician your boss has asked you to sort it out and
>>>> identify / label the wires at both ends. You only have a battery 
>>>> and
>>>> light bulb to test continuity and tape/pen for labeling the wires.
>>>>
>>>> What is the shortest distance in kilometers you will need to walk 
>>>> to
>>>> correctly identify and label each wire?
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
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>>>>
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>>>> content.
>>>>
>>>
>>> _______________________________________________
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>>>
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>>> content.
>>
>>
>> _______________________________________________
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>>
>> When replying, please edit your Subject line to reflect new content.
>
> _______________________________________________
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>
> When replying, please edit your Subject line to reflect new content.