Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is __________ mm.

A. 15

B. 25

C. 10

D. 30

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

You can do it
  1. The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction…
  2. Young's modulus of a material is the measure of its
  3. In practice, the compression ratio of compression-ignition (CI) engine ranges from
  4. Which of the following material handling equipments is not suitable for moving materials in varying…
  5. Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by
  6. On being hit with a hammer, __________ will readily fracture.
  7. Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing…
  8. The two elements required to form substitutional solid solution should not have
  9. Identify the false statement
  10. Which of the, following is not associated with the functioning of a petrol engine?
  11. Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at…
  12. The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is __________…
  13. Which of the following is not a charge material for cupola?
  14. Which of the following is a commonly used manometric liquid for low pressure range?
  15. Baffles provided on the shell side of a shell and tube heat exchanger are meant for
  16. Metal shots used in shot blasting are made of
  17. Basicity of the slag in Indian blast furnace is in the range of
  18. The process of removal of scale formed during hot rolling of steel is termed as
  19. Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional…
  20. Uniform ramming of sand in green sand moulding process leads to
  21. Maximum permissible air velocity in pipelines is about __________ metre/second.
  22. Speed of a submarine in deep sea & that of an aeroplane is measured by a/an
  23. Which of the following approaches the ideal gas behaviour most closely?
  24. A solution which resists change in its pH value on addition of acid/alkali is called the __________…
  25. For separating small pieces of metal from engine oil of a car, the best separating technique is the
  26. Rankine cycle comprises of two isothermal and two __________ processes.
  27. Maraging steels derive their strength from the following mechanism:
  28. Cupola produces __________ iron.
  29. Dielectric
  30. As per the Indian boiler regulation (IBR), the type of joint preferred for the circumferential joint…