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#1. Balls and rollers of anti-friction bearings are generally made of ….
#2. When a piece of metal is cut, the material is subjected, as it comes in contact with the cutting edge, to a force known as…………
#3. Tempered condition refers to the condition of metal or metal alloys with respect to …………. Or ………..
#4. To relieve strain and reduce brittleness steel is ………. after being hardened.
#5. Surface oxidation of steel or cast iron is often known as …………
#6. Running seal is
#7. Furnaces operating at temperature of about 2500 degree F usually employ resister bar of ………………….
#8. When the alloy become too hard for further forming it have to be re-heat treated or …………
#9. Stainless steel expands about………..percent more than mild steel.
#10. Recessed triangle on head surface
#11. MTCS about Glue
#12. Which of the following is easily removable
#13. As a general rule, a soaking period of ………….. to …………is sufficient for the average heat-treating operation.
#14. In Chrome-vanadium steel, the percentage of chromium and vanadium are…….
#15. Which type of the corrosion penetrates to the core
#16. SAE 1010 to 1030 is a ………….. carbon steel.
#17. MTCS Clearance
#18. ………percent of copper may be present as incidental elements in alloy steels.
#19. The thermocouple which can be used upto 2800 deg. F, is made of ………. & ………..
#20. The temperature of heat-treating furnace is measured by………….
#21. The portion of tooth space that is cut below the pitch circle is equal to addendum plus clearance ?
#22. Nickel steel causes the spark stream
#23. To produce maximum softness the metal must be cooled ………..
#24. The ………….. strength of material is it’s resistance to twisting.
#25. In annealing greater softening can be achieved if
#26. …………is used for making compressor disk, spacer rings, compressor blades and vanes, through bolts, turbine housing and lines, and miscellaneous hardware for turbine engine.
#27. When a section dimensions are 6” X 6” or larger & approx. square is called……
#28. . ………… furnaces require air for proper combustion and an air compressor or blower is therefore necessary.
#29. Which has low water absorption rate and good resistance and low temperature
#30. MTCS
#31. If the finished forged surface is concave……..
#32. One of the distinctive features of 18-8 steel is that…………… . .
#33. . …………steel has replaced carbon steel in fabrication of structural parts.
#34. Chromium in Stainless Steel makes it:
#35. Bearing which takes radial loads
#36. The distance a screw thread advance axially in one turn
#37. Annealing process used in sheet and wire industries to restore ductility is
#38. Al is vital to aviation because
#39. The extra flexible control cables are used in
#40. A O-ring designate specifically for the use as a static Seal properly will not to the job when installed on the
#41. Hardest structure of metals
#42. Which type of plastics harden upto heating, and reheating has no softening effect
#43. .Which gear is one which the teeth are cut so that they radiate from apex of the cone and lie on the conical surface
#44. After heat treatment tempering is done to
#45. MTCS about Microbiological corrosion
#46. Which type of fitting is used in plumbing
#47. Diametric pitch of gear is ? shop theory
#48. Nitriding is used for
#49. As the temperature increases colour of steel changes from dull red to a variety of colours and finally to…………..
#50. Four- Numerical series is used to designate the
#51. Mark the correct statement:- (DGCA Paper-2 Exam)
#52. Lead baths can be used in the temperature range of……………….
#53. In hot working metal is heated ………… and rolled into various shapes.
#54. Strength of chrome vanadium stell can be increased by ? 9A 5-69 0R 5-4
#55. INCONEL is a alloy of…………
#56. Sheet forms is used for secondary structural stressed structural parts
#57. The Belleville spring are used in
#58. Fairleads should never deflect the ailment of cable more than _____from straight line
#59. INCONEL has strength greater than ……..percent of Nickel.
#60. ………have no clearly defined grip length
#61. Corrosion on ferrous metals is chemically removed by caustic and non-caustic chemicals depending upon:-
#62. A salt bath heating range is…………….
#63. Nickel increase ……….. & ………. When combined with carbon steel.
#64. The size of gear is determined by
#65. What are miter gear
#66. muntz metal composed of ___________
#67. Presence of Sulphur in Iron makes it :
#68. . ………. Welds readily and has working qualities quite similar to those of corrosion resistance steels.
#69. …………are shaped or formed by pressing or hammering heated metal in dies.
#70. The 6000 series contains