Mechanical Engineering core questions

MBA CAT 2022
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These questions were asked by Great Lakes people



1). Draw a graph for y= e^(x) + e^ (-x) {we'll get a U shape, half U to the left of Y axis & Half U to the right. The graph meets Y axis roughly at 3.1 units)



dude....desn't the graph of y=e^x + e^ (-x) meet the y axis at y=2 units????:
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Well dug this ques out from the last page.
As far as entropy is concerned make sure while answering such questions make sure u r very specific n precise wid ur wordings. Here u missed out the term 'isolated'. the entropy of n isolated system always increases. if the system is not isolated then a certain process can can result in the decrease in the entropy of the system but in turn will increase the entropy of some other system(s) in such a way that the net effect is an increase in the entropy 😃 .
Now try answering the ant Q.
another interesting Q is 'since entropy always increases, so a manager doing work in his Org must also be increasing entropy hence the disorderliness. but that's not true...or is it?"

esjay im still quite confused about entropy....
does the entropy of the universe ever decrease? if yes plz explain... :-S
4 sal ke baad bhi entropy nahin samjha
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esjay im still quite confused about entropy....
does the entropy of the universe ever decrease? if yes plz explain... :-S
4 sal ke baad bhi entropy nahin samjha

Nopes never! Entropy is the disorderliness of a system. Entropy can only increase or remain the same but cannot decrease for an isolted system. it is the waste energy that does not get utilised .... and its a very vast topic . I cannot explain it all here 😐 check out some links like this one:
http://www.entropysite.com/students_approach.html

ne specific query u have lemme know:)
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(the previous post edited)

Yes, the graph meets at 2, when x=0
Sorry for the previous answer.

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@ TAPMI..

1). What you mean by Discharge?
(quantity flowing per second through any section)

2). What is the unit for discharge? (litres/s)

3). In newspapers, v could see another unit now a days. What that unit is? (tmc, cusecs)

4). What is the formula for discharge? (Q=Area x Velocity)

5). What are the various losses in a pipe when a fluid is flowing? (due to sudden expansion of pipe, contraction, bending, friction etc.)

6). In case of frictional loss, what is the chief parameter that influences to a grater extent? (i think it depends on the reynold's no.)

7). y=x^(3). Does this function has min/max value?
(No min & max value)

@ KJSOMAIYA..

1). United states is using a seed to produce bio diesel. What is it? (soybean)

2). Apart from India, another developing country is producing Bio diesel. What is that country? (Brazil)

3). How many kgs of Vegetable oil can be extracted from 100 kg of Jatropha? (around 42-46 kg, depending on the screw press mechanism)
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@IIM L

1) What are heat transfer:thumbsup: and mass transfer:(? What is the difference between the two:( :(? Give examples of both. Does mass transfer take place when heat transfer take place :thumbsup?

2) What are centripetal and centrifulgal forces? Differentiate. :thumbsup:

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Another good one

Q> What is a differential ? Does a Maruti 800 have a differential?

( Plzz answer the second part)

Q> Do Front wheel drives have differential and If yes what modificatiosn are made?

PS: People I guess we can make better use of this thread if we also post answers to the questions posted :)



dude......i think every car has to have a differential... check this out
If your car did not have a differential, the wheels would have to be locked together, forced to spin at the same speed. This would make turning difficult and hard on your car: For the car to be able to turn, one tire would have to slip. With modern tires and concrete roads, a great deal of force is required to make a tire slip. That force would have to be transmitted through the axle from one wheel to another, putting a heavy strain on the axle components. - Howstuffworks

The differential is always on the driven wheel,it is not required on the free wheels. so in a FW drive a differential would be on the front wheel.
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@Lapie

Here are my 2 cents...

Maruti 800 does have a differential.
In front engined- front wheel drives there is a differential. It is integral part of transmission, and is called Transaxle.

Same goes for rear engined-rear wheel drives

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@IIM L

1) What are heat transfer:thumbsup: and mass transfer:(? What is the difference between the two:( :(? Give examples of both. Does mass transfer take place when heat transfer take place :thumbsup?

2) What are centripetal and centrifulgal forces? Differentiate. :thumbsup:


giving my 2 noble words ( though i m not 100% sure )

1) i think they were trying to ask for convective heat transfer in which medium transfer takes place carrying the heat with it .. for eg heat exchanger

2) i dont think so thts needed to be explained here .. is it ??

and about the differential thing .... every vehicle (ofcourse except 2-wheelers) wud have a differential ..
some have in rear as in trucks ( we can see it as a almost spherical structure in the rear of truck where a long rotating shaft gets into)

it wud be impossible for a vehicle to turn without a differential ,, as mentioned from tht how stuff works info above ..

practically , u must have observed in toy cars ( if u played with them ) ,, they always go straight bcoz they have a common shaft ... while in differential both the wheels can move at different speeds , if required.
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hey...thanx a lot for that IIT lecture notes site....its brilliant!
However,i need some basic level info about Supply Chain Management,Inventory Control,Material Handling, Total Quality Management...very basic,from a students perspective....Google seems to return case studies and industry specific results.
Any helpful link available?

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hey...thanx a lot for that IIT lecture notes site....its brilliant!
However,i need some basic level info about Supply Chain Management,Inventory Control,Material Handling, Total Quality Management...very basic,from a students perspective....Google seems to return case studies and industry specific results.
Any helpful link available?

there is a book by ILO on Industrial Engineering costs 150 rupees
its really great for these stuff
pm me ur email id will send u few files from my home pc in the evening for others
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there is a book by ILO on Industrial Engineering costs 150 rupees
its really great for these stuff
pm me ur email id will send u few files from my home pc in the evening for others

Hey, I will PM you..plese send it to me too.

Also, does anyone have stuff on Total Quality Management?
53
hey...thanx a lot for that IIT lecture notes site....its brilliant!
However,i need some basic level info about Supply Chain Management,Inventory Control,Material Handling, Total Quality Management...very basic,from a students perspective....Google seems to return case studies and industry specific results.
Any helpful link available?

hey guys u all can go thrugh the files section of yahoo groups for APICS (CPIM and CSCP) they will give u good material on supply chain.
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Hey, I will PM you..plese send it to me too.

Also, does anyone have stuff on Total Quality Management?

will send u today evening as they r in my home PC
anyway u guys can slso visit
http://www.omnex.com
u need to register for free and u can download files on
TQM, Six Sigma, SPC, SQC, ISO, TS, OHSAS
great one for all work ex guys especially in automobile or home appliance manufacturing
just click on resource center link
55
there is a book by ILO on Industrial Engineering costs 150 rupees
its really great for these stuff
pm me ur email id will send u few files from my home pc in the evening for others


hey...thanx fer the help....ill send over the pm asap ...
56
on_da_rox Says
hey...thanx fer the help....ill send over the pm asap ...

8MB material sent to tweaky and on the rox
57
arorasid Says
8MB material sent to tweaky and on the rox

Received and thanks 😃
58

Talking about differential, this is what I was asked at IIM A:

"Railway bogies do not have a differential, and they have a common axle. How do they manage to make the turn?"

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Talking about differential, this is what I was asked at IIM A:

"Railway bogies do not have a differential, and they have a common axle. How do they manage to make the turn?"


Nice Question I must admit. I believe that Railway coaches don't moce on a curvilinear path. When a train has to turn its not a curve but moves through a set of parallel straight lines.

/ /
A series of such joints are there.

I might be wrong coz . Ne comments on this one
60
Nice Question I must admit. I believe that Railway coaches don't moce on a curvilinear path. When a train has to turn its not a curve but moves through a set of parallel straight lines.

/ /
A series of such joints are there.

I might be wrong coz . Ne comments on this one

But still there's got to be a 'turn' somewhere. I suppose we can relate the train bogies wid a bullock cart (that too doesn't have a differential) where there is slipping of the inner wheels. Now since the radius of curvature is very large the slipping/skidding wud be very low...also the rails are made of metal n is smooth - the surface doesnt deteriorate coz of erosion.
of course im guessing ;).
PS. Im still not clear about the presence of a differential in Maruti 800 ques . I actually discussed it with some ppl who hav decent knowledge bout it n they told me 800 n Omni don have differentials. what I feel supports my answer is the fact that had every 4 wheeler been equipped (esp 800) wid a differential why wud such a question pop up into the interviewer's mind:neutral: