Jump to content

Welcome to MSFN Forum
Register now to gain access to all of our features. Once registered and logged in, you will be able to create topics, post replies to existing threads, give reputation to your fellow members, get your own private messenger, post status updates, manage your profile and so much more. This message will be removed once you have signed in.
Login to Account Create an Account



Photo

Great Interview Question


  • Please log in to reply
37 replies to this topic

#26
5eraph

5eraph

    Update Packrat

  • MSFN Sponsor
  • 1,156 posts
  • Joined 04-July 05
  • OS:XP Pro x64
  • Country: Country Flag

Donator

GrofLuigi is correct. Fire only ever travels in one direction: outward from the starting point. In the absence of natural restrictions in the terrain, it will spread in an expanding circular pattern. Refuge must be created before starting a new fire because fire knows no ally.

Edited by 5eraph, 10 April 2010 - 02:20 AM.



How to remove advertisement from MSFN

#27
submix8c

submix8c

    Inconceivable!

  • Patrons
  • 4,289 posts
  • Joined 14-September 05
  • OS:none specified
  • Country: Country Flag
?WTH? Am I missing something?

Standard practice is a Firebreak... Go to the middle, set another fire, follow the burn and let the original fire burn its course to previously (you) burned area. Even if it moves outward (toward you again), you can still walk around the outer unburned area back into the (your) burned area.

SOP (or is this some kind of trick question)

(edit - same answer as last two I just noticed... a little obvious)

Edited by submix8c, 10 April 2010 - 09:50 AM.

Someday the tyrants will be unthroned... Jason "Jay" Chasteen; RIP, bro!

Posted Image


#28
gamehead200

gamehead200

    SEARCH!!! SEARCH!!!

  • Super Moderator
  • 7,039 posts
  • Joined 02-September 02
  • OS:Windows 7 x64
  • Country: Country Flag



Again depending on more variables: shape of the island, wind, rate at which the fire spreads, 'geometry' by which it spreads (radial/perfect circle?)...

I break one branch off, set it on fire and start another fire at the opposite end of the island (not directly oposite - imagine a triangle within a circle - touching point 1 is the thunder fire, 2 is the fire I started, and 3 is where I run to). The two fires should cancel out (burn each other's fuel).

There is a tiny flaw though - at some point I'll need to cross the 'line of fire'. :P

I'm dead, I know... :(

GL

Believe it or not, your answer is pretty close to the actual answer I was told. But think a bit harder... What would happen if you were to set two fires, both spreading in the same direction and burning at the same rate (ignore geometry for now)? ;)


It crossed my mind (square within a circle; or other polygons). But no matter how many fires I start, I will always have to retreat to an area with trees - and I can't imagine a situation where it won't spread towards me. If I start a fire in the middle, the two fires will cancel each other out on the other side, but 'my' fire will go towards me. :(

It's all about geometry ;)

GL



GrofLuigi is correct. Fire only ever travels in one direction: outward from the starting point. In the absence of natural restrictions in the terrain, it will spread in an expanding circular pattern. Refuge must be created before starting a new fire because fire knows no ally.



?WTH? Am I missing something?

Standard practice is a Firebreak... Go to the middle, set another fire, follow the burn and let the original fire burn its course to previously (you) burned area. Even if it moves outward (toward you again), you can still walk around the outer unburned area back into the (your) burned area.

SOP (or is this some kind of trick question)

(edit - same answer as last two I just noticed... a little obvious)

submix8c explained it the best. :)

#29
bphlpt

bphlpt

    MSFN Addict

  • Member
  • PipPipPipPipPipPipPip
  • 1,798 posts
  • Joined 12-May 07
  • OS:none specified
  • Country: Country Flag
I guess that GrofLuigi and 5eraph were thinking as I was about fire traveling similar to ripples from rocks thrown in a pond - outward from the center in a circle. If that were true a firebreak wouldn't work, since as GrofLuigi stated:

"I can't imagine a situation where it won't spread towards me. If I start a fire in the middle, the two fires will cancel each other out on the other side, but 'my' fire will go towards me."

But that doesn't take into account wind, which will always drive a fire away from it faster than in can come toward it, so on the (assuming) flat concrete island it will go in mostly one direction, or at least in a spreading cone shape. And if there were absolutely no wind, it would indeed expand in a circle, but it would create wind blowing toward it from the updraft caused by the heat from the fire. You could then use that wind and create small fires at the edge of the expanding circle, where the greater heat from the larger fire would pull the other fires toward it creating a safe zone for you. Do I have the theory correct?

Cheers and Regards

Posted Image


#30
MrJinje

MrJinje

    Toolâ„¢ Developer

  • Developer
  • 1,048 posts
  • Joined 14-October 09
  • OS:Server 2012R2
  • Country: Country Flag
You can't treat a wild-fire like a camp fire, that is rubbish, large fires radiate heat much farther than a tiny camp fire. Fact is that you would start cooking before you ever got your stick lit, so setting a fire-break will not work unless you have another way of starting it.

A wildfire front is the portion sustaining continuous flaming combustion, where unburned material meets active flames, or the smoldering transition between unburned and burned material. As the front approaches, the fire heats both the surrounding air and woody material through convection and thermal radiation. First, wood is dried as water is vaporized at a temperature of 100 °C (212 °F). Next, the pyrolysis of wood at 230 °C (450 °F) releases flammable gases. Finally, wood can smolder at 380 °C (720 °F) or, when heated sufficiently, ignite at 590 °C (1,000 °F). Even before the flames of a wildfire arrive at a particular location, heat transfer from the wildfire front warms the air to 800 °C (1,470 °F), which pre-heats and dries flammable materials, causing materials to ignite faster and allowing the fire to spread faster. High-temperature and long-duration surface wildfires may encourage flashover or torching: the drying of tree canopies and their subsequent ignition from below.


Edited by MrJinje, 10 April 2010 - 01:58 PM.


#31
Redhatcc

Redhatcc

    Advanced Member

  • Moderator
  • 366 posts
  • Joined 27-February 08
Here is my idea lol...


If it is a school of sharks, they are in a group, swimming around the island as one single unit? You would get in the water when they are on the opposite side of the island, and swim in the same direction as the sharks at the same speed, you will never catch them and they will never catch you. Then wait until the fire is burnt out.

And if this matters, make a boat out of unburnt wood, then do the steps above.

Close?

#32
ricktendo

ricktendo

    Group: Banned Members

  • Member
  • PipPipPipPipPipPipPipPip
  • 2,308 posts
  • Joined 06-June 06
  • OS:Windows 7 x64
  • Country: Country Flag
I answer him with a question

Why is the island made entirely of concrete?

#33
gamehead200

gamehead200

    SEARCH!!! SEARCH!!!

  • Super Moderator
  • 7,039 posts
  • Joined 02-September 02
  • OS:Windows 7 x64
  • Country: Country Flag

I guess that GrofLuigi and 5eraph were thinking as I was about fire traveling similar to ripples from rocks thrown in a pond - outward from the center in a circle. If that were true a firebreak wouldn't work, since as GrofLuigi stated:

"I can't imagine a situation where it won't spread towards me. If I start a fire in the middle, the two fires will cancel each other out on the other side, but 'my' fire will go towards me."

But that doesn't take into account wind, which will always drive a fire away from it faster than in can come toward it, so on the (assuming) flat concrete island it will go in mostly one direction, or at least in a spreading cone shape. And if there were absolutely no wind, it would indeed expand in a circle, but it would create wind blowing toward it from the updraft caused by the heat from the fire. You could then use that wind and create small fires at the edge of the expanding circle, where the greater heat from the larger fire would pull the other fires toward it creating a safe zone for you. Do I have the theory correct?

Cheers and Regards

Yeah, the wind is key here... I guess that's something else I forgot to mention in the original situation. :blushing: Oops...

Here is my idea lol...


If it is a school of sharks, they are in a group, swimming around the island as one single unit? You would get in the water when they are on the opposite side of the island, and swim in the same direction as the sharks at the same speed, you will never catch them and they will never catch you. Then wait until the fire is burnt out.

And if this matters, make a boat out of unburnt wood, then do the steps above.

Close?

Let me ask you this... How fast can you swim? :P Definitely not as fast as a shark, I would think...

#34
5eraph

5eraph

    Update Packrat

  • MSFN Sponsor
  • 1,156 posts
  • Joined 04-July 05
  • OS:XP Pro x64
  • Country: Country Flag

Donator

I guess that GrofLuigi and 5eraph were thinking as I was about fire traveling similar to ripples from rocks thrown in a pond - outward from the center in a circle. If that were true a firebreak wouldn't work

That was my thinking as illustrated in the crude image below.

Attached File  05 - Fires Merged.png   22.34KB   10 downloads

I am the blue dot, my fire started at the yellow dot, and the lightning struck at the yellow lightning bolt. The black area is burned but safe. The green area is unburned. And the red outline on the burned area indicates the fire line that cannot be crossed or touched. As is evident in my image, I'm screwed with less time than I originally had if I hadn't started another fire.

But that doesn't take into account wind, which will always drive a fire away from it faster than in can come toward it, so on the (assuming) flat concrete island it will go in mostly one direction, or at least in a spreading cone shape. And if there were absolutely no wind, it would indeed expand in a circle, but it would create wind blowing toward it from the updraft caused by the heat from the fire. You could then use that wind and create small fires at the edge of the expanding circle, where the greater heat from the larger fire would pull the other fires toward it creating a safe zone for you.

Assuming that is correct, you cannot expect a layperson to know that information. If I were interviewing for a firefighter's position then this would be a fair question. It's not a fair question to ask of somebody you pulled off the street.

Yeah, the wind is key here... I guess that's something else I forgot to mention in the original situation. :blushing: Oops...

I would not have arrived at the desired answer even if you had mentioned the wind. Specific knowledge was tested, not common sense as it should have been.

Good questions an interviewer should ask should either be directed toward information the prospective employee should already know, or general logic questions that rely on common knowledge that will reveal to the interviewer how the prospective employee thinks and arrives at conclusions. As I said above, this would be a good question to ask of a firefighter, not a network technician or car mechanic.

Edited by 5eraph, 10 April 2010 - 03:08 PM.


#35
cluberti

cluberti

    Gustatus similis pullus

  • Supervisor
  • 11,252 posts
  • Joined 09-September 01
  • OS:Windows 8.1 x64
  • Country: Country Flag

Assuming that is correct, you cannot expect a layperson to know that information. If I were interviewing for a firefighter's position then this would be a fair question. It's not a fair question to ask of somebody you pulled off the street.

You miss the point of questions like this - it's not to get the correct answer, it's so the interviewer can "see" how the interviewee thinks, and what kind of mental horsepower he or she has. You get asked logic questions with less-than-obvious answers (and ridiculous situations) partially because they would never happen in real life, so you have to really think hard about your answers. You miss the point of the questions entirely.


Good questions an interviewer should ask should either be directed toward information the prospective employee should already know, or general logic questions that rely on common knowledge that will reveal to the interviewer how the prospective employee thinks and arrives at conclusions. As I said above, this would be a good question to ask of a firefighter, not a network technician or car mechanic.

Asking someone things they already know will only tell you certain things about a person. If you want to find out also how well they react to odd situations, or how someone thinks on their feet, asking questions you would reasonably expect an interviewee to know gets you nothing. Again, you miss the point of asking these types of questions in the first place - it's fairly common in a dev interview to get dev questions, logic questions, and interpersonal-type questions. Assuming you're a decent dev, and not a complete jerk, the only part that will be "hard" will be the logic questions, and it's something that can get you a job or lose you a job, honestly, as most other interviewees who make it past the first screening are also likely decent at their job (at least), and are problably decent people as well.



MCTS Windows Internals, MCITP Server 2008 EA, MCTS MDT/BDD, MCSE/MCSA Server 2003, Server 2012, Windows 8
--------------------
Please read the rules before posting!
Please consider donating to MSFN to keep it up and running!

#36
5eraph

5eraph

    Update Packrat

  • MSFN Sponsor
  • 1,156 posts
  • Joined 04-July 05
  • OS:XP Pro x64
  • Country: Country Flag

Donator

But I do understand all that, cluberti. gamehead200 was looking for a specific answer involving wind. Please read my previous response more carefully if you don't believe me. ;)

[...] this isn't the answer.

the wind is key here...


Edited by 5eraph, 22 April 2010 - 09:47 AM.


#37
JustShootIt

JustShootIt

    Newbie

  • Member
  • 27 posts
  • Joined 15-May 10
  • OS:XP Pro x86
  • Country: Country Flag

I got asked this in an interview once so that the interviewer could understand my thought process. The answer is actually extremely simple, but unfortunately, I wasn't able to get the right answer at the time.

Here goes...

You're stranded on an island made entirely of solid concrete (comment: unlikely, but OK) in the middle of the ocean. The island has nothing but trees on it. There is a school of sharks swimming around the island. While you're on one side of the island, a lightning bolt strikes a tree on the opposite side of the island and the tree catches fire. Slowly, but surely, the fire spreads from one tree to the next and makes its way towards you.

How do you survive? :P


I think that if an employer made a decision on such a ridiculous basis, I would go looney if I worked there. A pefect example of "business school thought"...someone who doesn't even know the job their employees do, while trying to tell them how to do it, because they don't have the brains to do even the simplest job themselves. Save me from that type!
 
"If something looks too good to be true, it's best to shoot it, just in case." -- Fiona Glenanne [Burn Notice, USA]

  • Windows XP Pro SP2 (Also have legacy Windows, not installed, except I lost my ME disk. Can install a legacy version in extra space if needed to help troubleshoot.)
  • Linux (Slackware 13), KDE 4 (but will go back to 3, 4 imitates Vista too much), wireless automatic, no need for monitor drivers
  • Linux (Absolute Linux), GNOME, comes with CUPS already configured/running, hundreds of printer-drivers built-in, no need for monitor drivers

#38
puntoMX

puntoMX

    n00b of Masters and Vice Versa

  • Super Moderator
  • 4,848 posts
  • Joined 28-June 04
  • OS:Windows 8.1 x64
  • Country: Country Flag

Save me from that type!

:lol:


Any way, a silly question will have a silly answer I would say (flame me! :P), sooo: I will turn into a beaver and use my teeth to get that tree down, heck, I would not live long on some concrete with burned trees, I would take my last swim or stick my head out towards a shark to make it quick!




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users