DRILLING - Quiz

1) Which type of bonded wheel is used in foundries for dressing castings?

Silicate bond Shellac bond Rubber bond Resinoid bond

2) What type abrasive wheel is used for grinding cemented carbides?

Green silicon carbide Grey aluminium oxide White aluminium oxide Brown aluminium oxide

3) What is the value of one vernier division of a vernier micrometer?

0.01 mm 0.02 mm 0.009 mm 0.002 mm

4) Why grey cast iron widely used for machine tools?

Rapid cooling Reduce vibration High tensile strength Very difficult to machining

5) What is the tap drill size for M20 x 15?

18.5 20 19 17