Workshop Technology
The edge of a steel plate cut by oxygen cutting will get hardened when the carbon content is

Less than 0.1 percent
More than 0.3 percent
Less than 0.3 percent
Anywhere between 0.1 to 1 percent

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Workshop Technology
Riddle is used for

Cleaning the moulding sand
Moistening the sand around the edge before removing pattern
Reinforcement of sand in the top part of moulding box
Smoothing and cleaning out depressions in the mould

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