21. A specimen of aluminium metal when observed under microscope shows
22. The correct sequence for descending order of machinability is
23. The ability of a material to resist fracture due to high impact loads, is called
24. Brass (alloy of copper and zinc) is an example of
25. Carbon in iron is an example of
26. An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and
27. The percentage of carbon in pig iron varies from
28. The carbon in the pig iron varies from
29. The percentage of carbon in cast iron varies from
30. An important property of high silicon (12 - 18%) cast iron is the high
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