For infinite parallel planes having emissivities ε1 & ε2, the interchange factor for radiation from surface 1 to surface 2 is given by





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  1. In case of simple harmonic motion, displacement is proportional to the
  2. The specific gravity of coal depends mainly on its __________ content.
  3. Pick out the correct statement about the condensation.
  4. Broaching tools are usually made of
  5. Dislocation cross-slip is difficult in those materials, which have
  6. Fibre glass is a composite material of
  7. Angular displacement can be measured suitably by a
  8. __________ remains constant during the adiabatic cooling of moist air.
  9. Function of fusible plug in a boiler is to
  10. High endurance limit of carburised machine parts is because of the fact that carburisation
  11. The passage between the nozzle and the __________ is called 'sprue' in case of injection moulding.
  12. Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be…
  13. Baffles provided on the shell side of a shell and tube heat exchanger are meant for
  14. In the diving apparatus, helium is used along with oxygen, because it is
  15. Batch process is preferred over continuous process, when the
  16. A jig is used while __________ a hole.
  17. Corona discharge is related to the operation of a/an
  18. Which of the following is a boiler accessory i.e., not a boiler mounting?
  19. Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron.
  20. Which of the following processes follows the hardening process for reducing the hardening strains &…
  21. Which of the following is the most suitable abrasive for grinding high tensile strength materials?
  22. The rolling process cannot be used to produce
  23. Unit of viscosity in CGS system is
  24. In a furnace with heating element temperature at 1700°C, the dominant mechanism of heat transfer…
  25. L.D. (Linz-Donawitz) converter is used in the production of
  26. Pressure required to increase the density of water by about 1% is __________ atmosphere.
  27. Preheating before welding is done to
  28. Routing in production, planning & control is concerned with the
  29. For preparation of porous bearings by powder metallurgy, preferred particle shape is
  30. The concentration of (H+) ions is 4 x 10-5 in a solution. Then pH of the solution will be (Given log…