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Satellites burn off during re-entry to earth's atmosphere, because of the

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A. Combustion with air

B. Gravitational pull by earth

C. Friction with earth's atmosphere

D. Loss in weight of the satellite

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Correct Answer : C.


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  1. While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous…
  2. Nusselt number/Biot number varies
  3. Which of the following has the least value of ultimate tensile strength (UTS)?
  4. For a spontaneous natural process at constant temperature and pressure, the free energy of the system…
  5. Which of the following is preferred for riveting?
  6. Mild steel has __________ crystal lattice structure.
  7. 'Ice point' is designated on Fahrenheit temperature scale by
  8. __________ cannot increase the fatigue strength of a material.
  9. __________ temperature remains constant during adiabatic saturation process of unsaturated air.
  10. When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the
  11. The most serious manufacturing defect from fracture toughness point of view is
  12. In troposphere (the weather domain), the temperature 't' at height 'h' above the sea level in metres…
  13. __________ can replace tungsten in high speed steel.
  14. Which of the following is not a characteristic observed in material failure by fatigue fracture?
  15. Which of the following is not used as a bearing material?
  16. All of the following alloying elements of steel increases hardness but sacrifice ductility, except
  17. __________ furnace is generally used in the non-ferrous foundries.
  18. Steel containing low percentage of nickel, chromium & tungsten are termed as the __________ steel.
  19. Normalising does not __________ of a metal.
  20. Spherical shape of mercury droplets is due to its
  21. Boiling point of water gets lowered at high altitudes (e.g., hills), because
  22. Which of the following terminology is used for the temperature at which new grains are formed in a metal?
  23. Nuclear fission of one atom of uranium-235 produces the energy equivalent to about __________ MeV.
  24. Cold working of a material results in increase in hardness, which is termed as the __________ hardening.
  25. Milk is fat dispersed in water. It is an example of
  26. Young's modulus of a material is the measure of its
  27. Which of the following is the most wear resistant grade of carbide used for the cutting tools?
  28. A compact estimate about the amount of materials handling between various work stations is obtained…
  29. In the blast furnace, incorporation of water vapour in the blast gives the following effect.
  30. Minimum thermal efficiency of a steam boiler may be around __________ percent

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