DRILLING - Practice Mode

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

Silicate bond Shellac bond Rubber bond Resinoid bond

Correct Answer: 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

Correct Answer: Green silicon carbide

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

Correct Answer: 0.009 mm

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

Rapid cooling Reduce vibration High tensile strength Very difficult to machining

Correct Answer: Very difficult to machining

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

18.5 20 19 17

Correct Answer: 18.5

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