21. What happens, when SO2 is passed through a solution of H2S in water?
22. Which of the following is the most suitable abrasive for grinding high tensile strength materials?
23. Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs.
24. Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs?
25. Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of
26. The primary strengthening mechanism in 70 : 30 brass is the
27. Which of the following hardness tests uses the depth of penetration caused by the indentor as the parameter for arriving at the hardness value of a material ?
28. The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability ?
29. Specific gravity of hot metal (pig iron) is __________ times that of the blast furnace slag.
30. The pH value is the measure of hydrogen ion concentration in a solution. The term pH stands for the __________ in the solution.
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