Placement Papers - L & T Infotech

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L&T INFOTECH PAPER

Posted By : Priyanka Choudhari Rating : +7, -8
L&T (Mechanical)

SECTION ONE

1. Effect of temp. on viscosity

2. Internal keyways are made by:
ans:milling

3. M33*2 emplies what?

4.how do u decides fits

5.core print=?

6.stroboscope use to measure what

7.piezometer is used to measure
a. static pr. b. vel. c. rate of flow d. total pressure

8.turbine rotating at 3ooo rpm and balanced at 1500 rmp.....
1. ratio of balancing speed to operating speed.
2. " sqrt(bl. speed / op speed)   3. " sqr(bl speed )/op speed    4. .........

9. lap joint hoe many screws will be used.(thickness was not mentioned)

10 how do u decides hardning of guiode way of m/c.

11. stress conentration factor is affected by (couldn't remember option)

12 why a punch is surface hardnend.


SECTION TWO
This section checks the concepts of class 12th mechanics. All the question contained figure.
Just go through the very basic ideas of
1. Gear arrangement. along with pulleys and belt drives.
2. Different gear arrangements.(external and internal)
3. Belt drives (open and closed)
u will be given combination of gear and belts. Direction of motion of one gear
will be given and u have to predict the motion of other gears.
There are 8 to 10 problems like this.

Then balancing of masses. in this masses are hung on one side oflever, u have to predict the balancing mass on other side of lever. Simple concepts of projectile motion, moment of inertia, shape of water coming out of tank .....
Simple concepts of wheel balancing.

Though the problems require very simple concepts but u will have to think carefully before selecting any option. U should maintain the speed.

One question on battery circuit.


SECTION THREE
In this section 3*3 matrix was given.
One box in the matrix was empty nd u have to choose the answer among 8 options. Just see the releationship existing between diffirent rows and columns and decide the answer. Everyone can solve up to 20 , but after that it becomes tough. It seems that questions attemted after 20 were deciding.


These are the questions which are asked in Technical Section.
in total there were 46 questions and the time given was 30 minutes. Somebody was saying that they have given the last year paper. After the questions i am giving the options (the order of questions and as wel as options may not be the same)

1 in diesel engine the comp. ratio is ______ then expansion ratio (more, equal, less,...)
 
2 carbon help in the improving __ of steel (ductility, malliability, hardness, machinability)

3 max hardness iin steel is due to
a carbon b sulpher & phosphorus c alloy metal d none
 
4 c. i. is used in heavy m/c beds due to (low cost,has high damping coefficient, its easier)

5 spring in series,give reelation for shiftness (ans:k1*k2/(k1+k2)

6 two material of conductivity k & 2k are used in laggging the [pipe, find the position of material w r to each other for minimum conduction[inner]

7 cronining in pully is done to

8 the shape of the b.m. diagram of cantilever carrying u d l is

9 hammer blow in pipe is due to

10 for uniform st of beam.

11 which beam will be uniformly loaded
a] a simply suported beam carrying point load at center
b]-------------------------------- u d l over hole length
c]---------------------------------centraly half of length
d] a cantilever beam carying u d l

12 a petrol engine having carbon deposition over the piston will effect on

13 fual air ratio in engine having dirty oil filter as compared in carburator with clean oil filter is (ans more)

14 areoplane wing are formed by
a]casting       b]forgiing    c]wire edm   d]streach forming

15 for butt welding of dissimilar metal of unequal thickness,which parameteer should have


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