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Hardening of steel is not possible, unless it is heated __________ critical point.

A. Above the highest

B. Above the lowest

C. Between the first & second

D. Between the second & third

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

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  1. Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative…
  2. Cold cracking in the heat affected zone of a high strength steel weld can take place because of the
  3. Out of the following, the lowest packing of atoms exists in __________ crystal lattice structure.
  4. In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb…
  5. Out of the following, the most malleable material is
  6. Absolute zero, pressure will occur, when the molecular momentum of the system becomes zero. A liquid…
  7. The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring…
  8. Silicon percentage in acid resistant cast iron is about
  9. Brittleness induced due to the presence of sulphur in steel can be reduced by adding
  10. Leakage in a cooking gas cylinder is detected by
  11. Optical activity is a/an __________ property.
  12. Which of the following phenomenon will exhibit the minimum heat transfer?
  13. In the blast furnace, incorporation of water vapour in the blast gives the following effect.
  14. The majority charge carriers in p-type silicon are
  15. Blow off cock is provided in steam boiler to
  16. Which of the following is the most suitable abrasive for grinding high tensile strength materials?
  17. Glycerine is used as a coolant in cooling of some engines instead of water, because
  18. The most important requirement for aluminium industry is the availability of cheap
  19. __________ is the most suitable lubricant for drawing mild steel wires?
  20. Thermodynamic cycle involved in the working of a thermal power plant is the __________ cycle.
  21. Runge-Kutta method is used to solve a/an
  22. A material subjected __________ must have high resilience.
  23. Fibre glass is a composite material of
  24. Wrought iron is not
  25. Lead is poured into the joint between two- __________ pipes.
  26. __________ iron is produced by the annealing of white cast iron.
  27. Pick out the wrong statement.
  28. Addition of __________ to steel does not impart hardness.
  29. Brazing is the joining of metals
  30. __________ wire is never used for making the heating element.