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Technical - Other Hyderabad - 30 June 2005 by ISRO

Details of Technical - Other Hyderabad - 30 June 2005 by ISRO conducted by ISRO for job interview.
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Written Test for Scientist / Engineer_SC :  [ Mechanical Engineering ]

Date: 30-06-2005

Place: St. Annes School, Hyderabad. 

                                       Question Pattern for Written Examination

      80 Questions

      2.00 hrs Duration

      Negative Marks

      All are Objective & Multiple choice Questions.


 1  The concept  of  ---------------------------------- derived from the ZEROTH LAW OF THERMODYNAMICS.


2  The concept of  ------------------------------------- derived from the SECOND LAW OF THERMODYNAMICS.


3  The expression for  isentropic index [] in terms of number of degrees of freedom

( n ) ------------------------

                                                                        1+ [ 2 / n] 

4  The critical  Reynolds no upto which the viscous flow exists in pipe  -------------------



5   Two forces  of equal magnitude P acts at right angles to each other and having  same directions. Find out the expression for their resultant [R ]--------------------

                                                                         [2] P 

6  The angular frequency of handclock------------------

                                                                                /30 rad/s

7   The equation for free torsional vibration----------------------------

                                                                                [1/2] [q/I]                                                                         


8    A thin cylinder is subjected to longitudinal stress 0 and internal pressure P , findout the maximum shearstress developed in it [ q max]  ------------------------

                                                                                                         0.5 0

9  Rate of moment of momentum is equal to the -------------------------

                                                                              Torque applied by the body 

10  The expression for loss of energy [he ] due to sudden enlargement of the pipe--------

                                                                                  he =[v1-v2]/2g                                                                               

 11  A spring of stiffness K is divided into n number of springs. Each spring having stiffness ---------------------------


12 The non-dimensional number corresponds to

                                    [inertia force\compressibility force]------------------------------                                                           Euler number 

13 Equation for forced vortex flow-----------------------------

                                                                           v/r = constant 

14 The causes of cavitation

Metallic surfaces are damaged

Noise & vibrations 

15  How to increase the thermal efficiency in Carnot cycle by-------------------------------

                                                                   Decreasing low temperature

 16  The slenderness ratio in columns can be obtained from the ---------------

                                                         Least radius of gyration  

17   50:1 gear reduction ratio possible in-----------------

                                                              worm gear

18  Wire drawing property named as -------------------------


19  One man is standing in the elevator and the elevator is moving in the upward direction. What type of reading regarding the weight of man will we get from gauge---------------

                                                          The weight of man shown by the gauge will more the actual weight of the man. 

20   LMTD for counterflow heat exchanger is compared to parallel to heat exchanger-----


21   The free damping equation  2y +  3y +8y =0. Calculate  damping factor (D.F )--------



22  The discharges for  the two parallel pipes of same lengths are  Q1 & Q2 respectively and their diameters are 200 mm & 800 mm respectively. Calculate the  ratio of discharge of smaller pipe to larger pipe.


23  A compressor is used to compress the air from 5 bar to 10 bar .Calculate its critical pressure [ P٭]----------------------

                                                                 2.64 bar 

24   Equivalent twisting moment------------------------------

                                                                           Te = [T + M] 

25  The shear stress distribution in pipe flow -----------------------------

                                                                            Centre is zero and linearly varying from the center to the wall 

26   The irrational component in x-y is--------------

                                                          v/x = u/y 

27 The ratio kinetic viscosity/thermal diffusivity is -------------

                                                                             Nusselt Number


28   The cylinder is subjected to insulations K & 2K  at the outside surface to avoid heat transfer. In order to arrest heat transfer effectively , which insulation should be provided first at the outer surface?

                                                             2K & K respectively


29  The wall having conductivities

K1      K2

 Findout the equivalent conductivity of the material--------------------?


29   The maximum amplitude in this vibration equation y = 6 sint    --------


30   The thermal boundary layer in an ideal fluid flow is --------------


31  What does tend to stagnation point -----------------------

                                                         The velocity is 0 at the stagnation point due to the increase in pressure energy from the conversion of K.E into P.E. 

32    Match the following:

           i.            subsonic nozzle                           :  figure

         ii.            Supersonic nozzle                        :  figure

        iii.            Subsonic diffuser                          : figure

       iv. Centrifugal compressor                 :  figure


33   The factor of safety subjected to number of cycles related to

                                                                 Endurance limit 

34   In composite beam , width is directly proportional to -----------------------------------

if the depth of the beam is kept constant.


35   The heat transfer rate of hollow cylinder is inversly proportional to the following

---------------------------------                     r2/r1                                                                                  


36  A material  at 300C is immersed in  water at 30C such that it will take  170 seconds to become 150C .

A same material at 300C is put in air at 30C but  it will take 200 seconds to become 150C. What is the reason behind it ?

                                                               K of water is more compared to air 

37  Radiation is ------------------------------------------ wave phenomenon

                                                               Electromagnetic without medium


38  The compression ratio[r] of petrol engine ranges from -------------------

                                                                 6 to 10


39  Q/T =0 and s=0 corresponds to ----     irreversible & adiabatic

40      Cold working of metal increases ----------------------

                                            Tensile strength


41   The power absorbed in belt drive depends on-----------------------

                                                        Tension in tight side, Tension in slack side, coefficient of friction & Radius of pulley.


42   The temperature loss related -------------- hysteresis loss


43    The convergent pipe having entry and exit diameters are 100 and 50 mm respectively, find out their velocity ratio from entry to exit..


44   They had given one composite circular pipe having 4 varying cross sections . They are 2D, 1.5D, 4D & D respectively. The water is entering at velocity V at section 1 and leaving at section 4. Find out the pressure decreasing order



45  The bulb having weight 150N supported by two ropes and attached to the walls having angles 45 & 60. Findout the reaction forces in the ropes ?

                         This is related to Lamis theorem


46  A hollow sphere of radius r . A particle is moving with coefficient of friction 1/[3] inside the sphere from wall . which height will it become rest?


47   The disc is resting on the rough wall by a rope tied at the center . The rope makes angle with the wall around 30. The tension in the string is ----------than the weight of the disc.                                          more


48  A railway wagon containing partially full of water. Which angle----------------


49   Findout the graph between discharge [Q] in the x-axis and head [H] in the y-axis----------                                             


50  In welding pitch dimension is limited to----------------------


51  The composition of inconel alloy------------------- 

52  There is a heat transfer between two walls having thickness  and  conductivities k1 & K2 respectively. The linear temperature  profile of first wall is more steeper than the second wall . Findout the ratio K1/K2  ---------------------

a) >0         b) <0       c)=0  d) the given data is insufficient


53  The max shear stress developed in solid circular shaet is 100 MPa . Calculate the max normal stress developed in it?            ??????


54  This question related to welding -------------


55  Bearing liner-------------------------

 a) Babbit metal b) Gun metal


56   Electrical resistance material --------------Nichrome


57  This question related to radiation


58  A sun emits 1150K at 0.5. A furnace emits 300k from small door --------------


59    In the simple pendulum , the maximum amplitude depends on -------------------         increase in length


60   The fuel flow increases if-------------------------

                        a) exhaust valve burnt b) filter choke c) silencer choke

61    The jet propulsion depends on-------------

a)      jet velocity b) weight ratio


62     What is the condition for perfect frame-------------------------------------


63     Depth of cut can be increased by-----------------------


64     The workpiece can be held in-----------------


65    This is related toNucleate boiling


66    What is the expression for Reynolds number in terms of diameter of the pipe..Re =VD/


67    Air conditioning means---------------

a)      cooling & heating b)dehumidifying c) removing impurities from air d)all

 68  Fibrous fracture occurs in ------------------------

a)brittle fracture b) ductile fracture c)shear fracture d)none


69   In laser beam machining , the workpiece should be--------------

a)absorbed by all the rays b) reflected by all the rays


70   Foam and coke are good insulators. Why?-----------------------

a)less density b)


71   Gold property------------------

a)good conductor b)good insulator


72   In lathe , the workpiece can be held in --------------------------------------

a) live center  b)steady rest  c)3-way chuck  d)4-way chuck


                                     INTERVIEW PATTERN


              I.      Project Explanation


           II.      Fluid Mechanics:

                                 i.            Define laminar flow & Turbulent flow

                               ii.            What is the value of Reynolds no in pipe flow

                              iii.            What is the significance of Reynolds no

                             iv.            Head losses in pipe

                               v.            Define boundary layer in pipe flow & thickness of boundary layer

                             vi.            What is the variation of in laminar & turbulent flow


         III.      Strength of materials

                           i.            Draw the figure for spring damper system

                         ii.            Differential equation for spring damper system

                        iii.            Find out the deflection of spring damper system

                       iv.            Define stiffness and unit of stiffness


        IV.      Material Science

                             i.            Ferrous materials

                           ii.            Non-ferrous materials

                          iii.            Define fatigue

                         iv.            Define fatigue resistance?

                           v.            Curve for fatigue

                         vi.            Fatigue limit