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'Cryogenics' is concerned with the generation & use of low temperature in the range of

A. 0°K to 123°K

B. 0°C to - 123°C

C. 0°C to - 273°C

D. 0°K to 273°K

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  1. Blast furnace slag is mainly molten
  2. Larger length & diameter water pipes are made by
  3. As the fluid flow rate increases, the float of the Rotameter
  4. In a neutral solution
  5. High endurance limit of carburised machine parts is because of the fact that carburisation
  6. A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm2.
  7. Pick out the correct statement.
  8. Stainless steel is welded with difficulty because of
  9. In the blast furnace, incorporation of water vapour in the blast gives the following effect.
  10. The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is __________…
  11. Out of the following, the most malleable material is
  12. Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts…
  13. Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other…
  14. The excess air required for the combustion of pulverised coal is of the order of about __________ percent.
  15. Which of the following is the most suitable material of construction for the condenser tubes, where…
  16. Wrought iron does not have
  17. Maximum hardenability of steel depends upon its
  18. The maximum thickness of the metal which can be welded using ultrasonic welding is __________ mm.
  19. __________ has a negative co-efficient of linear expansion.
  20. Plasma is
  21. Joule-Thomson co-efficient is the ratio of
  22. For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship…
  23. Latent heat of dry steam at atmospheric pressure is 539 Kcal/kg; which __________ with increase in the…
  24. In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates,…
  25. Nuclear fission of one atom of uranium-235 produces the energy equivalent to about __________ MeV.
  26. Damage to metal surface by mechanical action is called
  27. Which of the following is the most wear resistant grade of carbide used for the cutting tools?
  28. Oxide layer formed on the non-ferrous metal surface after its annealing is
  29. Optical activity is a/an __________ property.
  30. Which of the following if present in iron ore, enhances its value?