Mechanical Engineering core questions

[Lapie]

Guyz Since many of us are from mechanical engineering background I think we can discuss here questions asked from our core field.

[CrazyGuy@pg]

wud luv to have some nice discussions goin arnd here ..

have already been grilled in 2 interviews coz of this ..

anyone who knows some gud site with all concepts at a place or having some material .. pls share !!

[Lapie]

I was asked in my IIM-B interview that what is second law of thermodynamics and why is it important. I told them that second law of thermodynamics is that entropy of a system is always increasing and gave an example that we can find which way rxn will proceed by applying this law. Then they asked me is it valid when an ant is reproducing I still have no clue what they were trying to ask.

[CrazyGuy@pg]

u sure tht this entropy thing is the second law ... by far wht i remember this is the third law . second law talks abt tht heat energy cannot be transfered from a system at low temperature to a system at high temperature without doing any work .. and something like tht ..

but yeah the second part is interesting ... when ant is reproducing ... taking a wild gues i think it shud .. more randomness coming into picture

[vindikg]

Gate buks which hav a summary of all important chapters are gud place to re-do engg

even i got grilled only on acads...
questions's lik wht's refrigeration,name diff refrigerants used,CFC's,how do IC engines work,which cars do TATA motors hav in market,thier engine specifications,my bikes specifications....
in short anything n everythin related to mech..

[Lapie]

Both of us are right. There are many ways of saying the second law. The third law is regarding entropy of a perfect crystal at zero kelvin which is taken as zero.

I also said that entropy will increase in the ant case but he said that its a process of disintegration and soemthing something which I couldn't follow..

[vindikg]

Ur right....in fact refrigeration is the practical example...i.e. based on the theory of 2nd law of thermodynamics

Originally Posted by CrazyGuy@pg

u sure tht this entropy thing is the second law ... by far wht i remember this is the third law . second law talks abt tht heat energy cannot be transfered from a system at low temperature to a system at high temperature without doing any work .. and something like tht ..

but yeah the second part is interesting ... when ant is reproducing ... taking a wild gues i think it shud .. more randomness coming into picture

[CrazyGuy@pg]

yeah i think u r right .. and this ant case is really tricky .. lets see wht others have to say ..

one more topic .. operations research ... seems to be fav of every prof ... and yeah how can i forget optimization ..
any clues how is optimization using simultaneous equation different from optimization using linear programming ??????

[Lapie]

Linear Programming : A method of solution for problems in which a linear function of a number of variables is subject to a number of constraints in the form of linear inequalities.

Optimization using simultaneous equations: Its a "superset" of Linear programming. In this case the equations may be non-linear as well

@Crazyguy: Please post all the optmization related questions that you faced because I'm saying optimization as my area of interest

[TintinAndSnowy]

Thanks for this thread.

Can we put this thread in the 'prep resources' folder? It will be very helpful, not only for ppl appearing for IIM interviews but also for ppl appearing for XL, FMS etc. interviews