DRILLING - Quiz

1) What is the name of the process of finishing the drilled hole?

Reaming Spot facing Counter boring Counter sinking

2) Why hand reamers have uneven spacing of teeth?

Reduce chattering Remove more metals Increase the efficiency Increase the life of the tool

3) What is the purpose of clearance angle in twist drill?

Prevent rough holes Prevent over size holes Prevent unequal angle of cutting edges Prevent friction of drill behind the cutting edges

4) What is the angle of counter sinking for riveting?

75 Degree 80 Degree 90 Degree 120 Degree

5) What is the reason for over heated drill while drilling?

Drill held not correctly Work is not rigidly he Clearance angle is incorrect Flutes are clogged with chips