Manufacturing Engineering Multiple Choice Questions on “Drilling “.
1. Producing circular hole in a solid metal by means of revolving tool is known as
a) Drilling
b) Reaming
c) Boring
d) Counter boring
Answer: a
Clarification: Drilling is defined as production of generally circular hole by using a revolving tool.
2. 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
Answer: b
Clarification: Reaming is a finishing operation of drilled hole. It is done to improve surface finish of drilled hole.
3. Process of enlarging the hole size and enhancing its surface finish is known as
a) Drilling
b) Reaming
c) Boring
d) Counter boring
Answer: c
Clarification: Once the hole is drilled by using drilling operation, later the diameter of hole can be increased by using boring operation.
4. Process of enlarging only a small part of hole is also known as
a) Drilling
b) Reaming
c) Boring
d) Counter boring
Answer: d
Clarification: 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. 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
Answer: d
Clarification: 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. Operation used to form internal threads is known as
a) Drilling
b) Reaming
c) Boring
d) Tapping
Answer: d
Clarification: Tapping is the process of forming internal threads by means of tool called tap.
7. 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
Answer: c
Clarification: For through hole, X = 0.5*D.
8. 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
Answer: a
Clarification: For through hole, X = 0.3*D.
9. 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
Answer: a
Clarification: X = (D/2)/ (tan (semi point angle)).
10. 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
Answer: c
Clarification: X = (D/2)/ (tan (semi point angle)). Semi point angle = point angle/2.