Mechanical Engineering core questions

MBA CAT 2022
1

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

2

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

3

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 !!

4

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 :wow: I still have no clue what they were trying to ask.

5

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

6

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..:neutral:

7

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..:(

8

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

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


9

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 ??????

10

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

11

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

12

I was asked in IMT GZB interview
which of the two cars should I buy Tata Indica or Zen Estello
and why??
Then he went on to petrol engine vs Diesel Engine
which one is better which gives more fuel effciency which has low running cost
which has low mantainance cost
more safety
Since I have worked with an automobile company that to a Tier one Vendor to both Maruti and Tata for Air Conditioning systems so I was ready for such questions

13

Hey Guys...

The questions related to automobiles...say diff btwn petrol/diesel engine, diff btwn engines of two vehicles are mostly asked.
Can anyone suggest some online stuff, coz its been long since I took a look at mech related book...(or do we actually need to get a book)?

Thanks

14

Its better to get a book of IC engines and the see the diff from thr

15
Lapie Says
Guyz Since many of us are from mechanical engineering background I think we can discuss here questions asked from our core field.


Good initiative to start this thread.

Dunno how feasible it is but could people from a mech engg background (or atleast those reading this thread) post the mech engg related questions that they have been asked in the interviews,as and when they happen, out here ?.Might be of help to other junta
16
Good initiative to start this thread.

Dunno how feasible it is but could people from a mech engg background (or atleast those reading this thread) post the mech engg related questions that they have been asked in the interviews,as and when they happen, out here ?.Might be of help to other junta

Niwsa
that is what being done here

anyway about petrol and diesel engines u need to know SI and CI in detail if u want to go to that level for that u need to refer books
u can get full deatils between the two
i will try to get some good material on web and post the link here

u people can post any mech related query in this thread i will try to give u answers as i am working with core mech firm as desing engineer i can get some resources for u guys
17
Lapie Says
Its better to get a book of IC engines and the see the diff from thr

Review on Petrol Vs. Diesel car by stryker135 - MouthShut.com

good one about petrol vs diesel
18

One of my friend was asked the following questions:
1> If you keep a Black body in a room. What will happen to the temperature of the Black body and of the room?

2> An I beam is to be used for taking a vertical load. Is it better to place it as it is i.e I cross section or turn it at 90 degrees i.e the Flanks are now vertical; H cross section. What about if its meant to handle moment?

Any answers

19
One of my friend was asked the following questions:
1> If you keep a Black body in a room. What will happen to the temperature of the Black body and of the room?
Any answers



This is what I think is the answer.I am not so good in many of these topics,so kindly pardon me if the answer is wrong or stupid

If the temperature of a blackbody is higher than that of the room,it should emit more energy than it absorbs(and no reflection or transmission takes place,since it is a blackbody),so its temperature should decrease i think, vice versa if the temperature of the blackbody is lesser than that of the room..I presume that normally the temperature of the blackbody is higher than that of the room,so temperature of the room should increase and that of the blackbody should decrease

As for the 2nd question,i dont have much of an idea but I'll try googling.Should be found in most strength of materials book i think.
20
One of my friend was asked the following questions:
1> ........
2> An I beam is to be used for taking a vertical load. Is it better to place it as it is i.e I cross section or turn it at 90 degrees i.e the Flanks are now vertical; H cross section. What about if its meant to handle moment?

Any answers



I section is most efficient in this case...
for details see this link ....
Beam (structure) - Wikipedia, the free encyclopedia