# MCQs on Drilling

1 - Question

Producing circular hole in a solid metal by means of revolving tool is known as
a) Drilling
b) Reaming
c) Boring
d) Counter boring
Explanation: Drilling is defined as production of generally circular hole by using a revolving tool.

2 - Question

Operation of finishing previously drilled hole in order to bring it to accurate size and have good surface finish is known as
a) Drilling
b) Reaming
c) Boring
d) Counter boring
Explanation: Reaming is a finishing operation of drilled hole. It is done to improve surface finish of drilled hole.

3 - Question

Process of enlarging the hole size and enhancing its surface finish is known as
a) Drilling
b) Reaming
c) Boring
d) Counter boring
Explanation: Once the hole is drilled by using drilling operation, later the diameter of hole can be increased by using boring operation. advertisement

4 - Question

Process of enlarging only a small part of hole is also known as
a) Drilling
b) Reaming
c) Boring
d) Counter boring
Explanation: Once the hole is drilled by using drilling operation, later the diameter of some part of hole can be increased by using counter boring operation.

5 - Question

Operation of enlarging the end of the hole to give conical shape at end is known as
a) Drilling
b) Reaming
c) Boring
d) Counter sinking
Explanation: Once the hole is drilled by using drilling operation, later the ends of hole can be machined into conical shape for proper adjustment of washer or other machine parts by using Counter sinking operation.

6 - Question

Operation used to form internal threads is known as
a) Drilling
b) Reaming
c) Boring
d) Tapping
Explanation: Tapping is the process of forming internal threads by means of tool called tap.

7 - Question

If ‘D’ is hole diameter, then general value for a compulsory approach for through hole can be taken as
a) 0.3*D
b) 0.1*D
c) 0.5*D
d) 0.8*D
Explanation: For through hole, X = 0.5*D.

8 - Question

If ‘D’ is hole diameter, then general value for a compulsory approach for blind hole can be taken as
a) 0.3*D
b) 0.1*D
c) 0.5*D
d) 0.8*D
Explanation: For through hole, X = 0.3*D.

9 - Question

If 20mm hole is needed to be drilled using a drill having semi point angle of 15 degrees. Value of compulsory approach in mm is
a) 37.2
b) 45.3
c) 87.1
d) 13.3
Explanation: X = (D/2)/ (tan (semi point angle)).

10 - Question

If 20mm hole is needed to be drilled using a drill having point angle of 15 degrees. Value of compulsory approach in mm is
a) 37.2
b) 45.3
c) 75.95
d) 13.3