Drilling and Reaming MCQ - Machinist(Set-1) with Answers

6) The drill sleeves or sockets are available with Morse taper and their number range MT-1 to MT-6. Which one of the following drill sizes refers to MT-4 ?

Answer is:

Drills above 31.75 mm up to 50.50 mm

Explanation:

For Morse Taper MT-4 the range starts from 31.7 mm and till 50.50 mm (Approx).

The drill sleeves or sockets are available with Morse taper and their number range MT-1 to MT-6. Which one of the following drill sizes refers to MT-4 ?

7) A drilled hole goes out of centre due to

Answer is:

Any of the above

Explanation:

A drilled hole goes out of centre due to
Improper clamping of workpiece
Workpiece having blowholes
Centre punch mark not being large enough to give proper seat to the chisel edge of drill

8) Which one of the following coolants is used for reaming aluminium workpiece ?

Answer is:

Kerosene

Explanation:

Kerosene is used as coolants when reaming aluminium work-piece.

9) A Dia 6H7 hole is to be reamed in a steel workpiece. What size of drill will be required ?

Answer is:

5.8 mm

10) The point angle of twist drill depends upon the

Answer is:

Material to be drilled

Explanation:

The point angle of a general purpose (standard) drill is 118°. This is the angle between the cutting edges (lips). The angle varies according to the hardness of the material to be drilled.