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A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness __________ metre.

A. 0.01

B. 0.1

C. 0.25

D. 0.5

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

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  1. Removal of non-condensable from steam or other vapour is termed as the __________ process.
  2. The ratio of the shear stress to the principal stress on a principal plane is
  3. Which of the following is the most suitable material of construction for the condenser tubes, where…
  4. Consideration of the creep is the most important in case of the
  5. Wavelength of radiation emitted by a body depends on the __________ of its surface.
  6. Which of the following is an example of cathodic protection of metals against corrosion?
  7. The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the __________…
  8. Ultimate strength in tension as compared to that in shear for steel is
  9. For a spontaneous natural process at constant temperature and pressure, the free energy of the system…
  10. Saturated steam at a pressure of 25 kg/cm2 is throttled to attain 5 kg/cm2. Then the outcoming steam…
  11. The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature…
  12. Identify the correct statement.
  13. Change in volume of metals from absolute zero temperature to their melting points is
  14. __________ property of a material is determined by the Herbert Pendulum device.
  15. Percentage of differential pressure lost in a Venturimeter with a tapering of 15° may be about
  16. The __________ of a double acting reciprocating pump as compared to the single acting pump will be almost…
  17. Super conduction in metals is observed at a temperature of __________ °K.
  18. Cascade control is
  19. Dielectric
  20. Increase in temperature, in general results in the
  21. Optical activity is a/an __________ property.
  22. Sand used to stop the green sand from sticking to the pattern is termed as the __________ sand.
  23. Fahrenheit and Centigrade scales have the same readings at
  24. A jig is used while __________ a hole.
  25. Limestone is added in the blast furnace (during pig iron manufacture) to
  26. Identify the false statement
  27. Electrochemical corrosion can occur, only if __________ is present in contact with metal.
  28. Large diameter reinforced cement concrete (RCC) pipes are generally joined by __________ joint.
  29. Annealing of cast iron
  30. Pick out the wrong statement.