The excess air required for the combustion of pulverised coal is of the order of about __________ percent.

A. 5

B. 15

C. 30

D. 45

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  1. __________ is the process used for setting up compressive stresses in the surface of a metal to improve…
  2. __________ the exhaust gas is an indication of the incomplete combustion of fuel.
  3. A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm2.
  4. Pick out the wrong statement.
  5. A psychrometer does not measure the __________ temperature of moist air.
  6. Basic open hearth furnace (BOF) is not used for producing __________ steel.
  7. Encyclopaedia of Chemical Technology has been
  8. Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare…
  9. Ferromagnetic materials owe their properties to __________ inner sub-shells.
  10. Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic…
  11. In the acid Bessemer process, the hot metal should have the following composition.
  12. Addition of __________ to steel does not help in improving its machinability.
  13. The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of…
  14. A cylindrical rod subjected to a tensile strain within the elastic limit undergoes a volume change.…
  15. Silicon in steel
  16. The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation…
  17. The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction…
  18. Larger length & diameter water pipes are made by
  19. Increasing sulphur content in pig iron tends to make it
  20. The approximate height of a blast furnace having a useful volume of 2000 m3 is about __________ metres
  21. The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for __________…
  22. All of the following alloying elements of steel increases hardness but sacrifice ductility, except
  23. Pick out the wrong statement about the machinability of metals. Machinability of a metal
  24. __________ is used as a material of construction for the blade of power saw.
  25. Sand used to stop the green sand from sticking to the pattern is termed as the __________ sand.
  26. Normalising does not __________ of a metal.
  27. If Reynolds number is greater than 1, then the
  28. Which of the following is not a ferromagnetic material?
  29. Surface tension of a liquid
  30. Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition…