Published on 03/31/2006

1.what is the equivalent spring constant of two srings with k1 & k2 as sring constant connected in series? ans. k1.k2/(k1+k2)

L&T Infotech placement paper 9

31st july,2004....... the pattern is like: 1) branch related ques. 50(30 min) 2) engg. aptitude test 60(40 min.) 3) non verbal ques. 36 (40 min) mech. ques which i can recall is ...may not be as per the language stated there in paper but it would really help there a lot..... mech. 1.what is the equivalent spring constant of two srings with k1 & k2 as sring constant connected in series? ans. k1.k2/(k1+k2) 2.by which moulding we produce thermosetting plastics? 3.when air is dirty what will be the injectility of the fuel .................more ? 4.carbon deposits increase the comp. ratio. 5.carbon increases the hardness. 6.hot fluid passes thro the cylinder. by using two insulating material(k,2k)in which sequence may be more effective.......? ( firstk, then 2k matl.) 7.wings of the plane can be made by stretching. 8.what will be the metal removal ratio if the balancings r done at 3000&1500 rpm.. ( cent. forces to be considered......ans 1:4) 9.what is cylinder ratio? ans. arrangement of cylinders in which the centre line of crankshaft journal is per.to the plane containing the centrelines of the engine cylinders. 10. In diesel cycle the compression ratio incereases more to expension ratio. 11. In the shm of the ball inside a earth hole passing through the center ,velocity maximum at the center. 12.viscosity of liquid increases with decrese in temprerature. 13. Piezometer measures static pressure.. 14. Which iron is used for body construction of machines, gray or white iron ?( not sure) 15.what is core print ? 16. pig iron is manufacture in --------blast furness 17. what is the effect of increase arc lenght in building 18. m 62 indicates ------ 6mm outer diameter & 2 mm pitch 19. what raputre failure. 20 . 6 cylinders in a row , n0. of crancks = 1 21. If in a steam power plant vaccum in condensor reduces what is the effect 22. pressure in industrial pnumatic lines -------5 to 10 bar 23. effect of low temp. ( -20 degree ) on carbon steel . 24.method of hardening of machine guidesways 25. method of joining plastic by welding 26. safe method of loading on a cantileaver a) UDL b) center point load c) triangular load having zero at center 27. BMD for UDL in cantilever Ans. parabolic 28. Beams of uniform strenght can be made by a) varying width b) varying depth c) both d) none 29. which of these not fusion welding process Ans: spot welding 30. function of stroboscope is Ans: speed measurement of spur gear 31.if diameter of pully is double how will the design of key way change 32.gray cast iron used for machine parts 33. use of worm gear 34.what will be the diameter of punched hole in punching opereation a) same as punch b) punch dia + thichkness of sheet 35. this is figure porblem described as : there is right anguler wadge with pully at vertex connecting two equal masses by string one on the sloping side and other on the vertical side Questin is what will happen to them Ans: mass will fall down