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Although it will not happen very often, there might come a time when you will have to _______a flat chisel or centre punchCorrectIncorrect
Before tempering a flat chisel, it should first be ground into ________CorrectIncorrect
Any ______burrs on the striking end must be ground away. They could break off during hammering and cause injuriesCorrectIncorrect
The cutting-edge_______of a flat chisel varies for the different types of materials to be cutCorrectIncorrect
Annealing is the process of heating steel and then permitting it to__________, thereby causing it to become soft and of uniform structure throughout.CorrectIncorrect
Sometimes steel will not become soft enough if left to cool in open air. In such cases it is essential to conceal the heated steel in lime until it is cold. If lime is not available, _________________may be usedCorrectIncorrect
Hardening is the process of heating steel to a medium cherry red colour and then ___________________.CorrectIncorrect
Ordinary tool steel is usually cooled by plunging it into water, while high-speed tool steel is cooled in a ___________, or in oil.CorrectIncorrect
________________is the process of reducing the hardness of steel and increasing its toughness to any desired degree.CorrectIncorrect
If a hardened piece of steel is slowly heated, it will gradually become softer as the temperature rises. When the desired hardness is reached, any further rise in temperature and consequent softening of the steel can be stopped by dipping it into ___________________.CorrectIncorrect
When tempering steel tools, the various degrees of hardness are indicated by a series of ____________________that appear on the surface of the steel under certain conditionsCorrectIncorrect