GRINDING - Practice Mode

1) What type of natural abrasives are crushed to produce abrasive grains for making the grinding wheels and lapping compound?

Emery Diamond Sand stone Corundum

Correct Answer: Diamond

2) What type of abrasives are used for grinding low tensile strength materials like brass, copper, grey cast iron and aluminium?

Corundum Aluminium oxide Green silicon carbide Brown aluminium oxide

Correct Answer: Green silicon carbide

3) What type of abrasives are used for grinding high tensile strength materials like carbon steels. high speed steels?

Silicon carbide Aluminium oxide Green silicon carbide Corundum

Correct Answer: Aluminium oxide

4) What type of natural abrasive contains aluminium oxide and other impurities?

Emery Diamond Sand stone Corundum

Correct Answer: Emery

Explanation:

Maroon is the colour painted on the acetylene gas cylinders.

5) What type of natural abrasives contains 95% of natural aluminium oxide and remaining impurities?

Emery Diamond Sand stone Corundum

Correct Answer: Corundum

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