In recuperative air preheaters, the heat is transferred

A. From a metal wall from one medium to another

B. From heating an intermediate material and then heating the air from this material

C. By direct mixing,

D. Heat is transferred by bleeding some gases from furnace

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

You can do it
  1. The effect of friction on the flow of steam through a nozzle is to
  2. If the critical pressure ratio for steam is 0.546, then the steam is initially
  3. Hygrometry deals with the
  4. Hard coke is used in
  5. A stage, in reaction turbine, is represented by
  6. Which of the following statement is correct?
  7. The pressure at which latent heat of vaporisation of water is zero, is
  8. Cut-off governing of steam engines is a method of controlling the engine output by varying
  9. The object of producing draught in a boiler is
  10. The principal function of a stop valve is to
  11. Water and sediment in fuel oil can be removed by
  12. Which of the following statement is wrong?
  13. Fire tube boilers are limited to a maximum design working pressure of
  14. A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut…
  15. The diameter of Cornish boiler is of the order of
  16. Green coal, in order to be burnt, must be
  17. The number of water level indicators in a boiler are generally _________ in number.
  18. When the nozzle operates with the maximum mass flow, the nozzle is said to be
  19. A regenerative steam cycle renders
  20. The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure…
  21. For the same diameter and thickness of tube, a water tube boiler has ________ heating surface as compared…
  22. The equivalent evaporation of a boiler is a measure to compare
  23. Sulphur in coal results in
  24. Orsat meter is used for
  25. The heat balance sheet for the boiler shows the
  26. The maximum steam pressure in a Locomotive boiler is limited to
  27. Locomotive type' boiler is
  28. Lancashire boiler is used where working pressure and power required are
  29. The action of steam in a steam turbine is
  30. Pulverised fuel is used for