This set of Machine Tools and Machining Aptitude Test focuses on “Drilling Operation”.
1. Which of the following operation is performed to ensure the correct location of a hole by making it concentric with the axis of rotation?
a) parting
b) tapping
c) boring
d) none of mentioned
View Answer
Explanation: This is the characteristic of boring. After the hole is made by drilling operation, boring is carried out. It is generally done to enlarge the diameter of the hole.
2. Which of the following operations can be done by same tool?
a) reaming and tapping
b) drilling and facing
c) counterboring and spot facing
d) none of the mentioned
View Answer
Explanation: Counterboring and spot facing can be performed by same tool. Counter boring is an operation which nis carried out for providing recess for nuts or bolt heads.
3. Reaming doesn’t improve the surface finish.
a) true
b) false
View Answer
Explanation: Reaming improves the surface finish. It generally enlarge the holes with great accuracy and give better dimensional accuracy-better surface finish.
4. Which of the following process is performed to provide seating for washer?
a) counterboring
b) spot facing
c) tapping
d) none of the mentioned
View Answer
Explanation: As per the definition of spot facing process. In spot facing operation, some specific part of the workpiece is faced. It gives better flat,smooth surface to that workpiece.
5. To produce more accurate holes, which of the following operation should be performed first?
a) drilling
b) reaming
c) centering
d) boring
View Answer
Explanation: As per the characteristic of all these operation, centering should be performed first before drilling, reaming and boring in order to produce more accurate holes. Center drill makes a hole. Now, this hole behave as a center of rotation for mentioned rest 3 operations.
6. To produce more accurate holes, which of the following operation should be performed last?
a) drilling
b) reaming
c) centering
d) boring
View Answer
Explanation: As per the characteristic of all these operation, reaming should be performed last in order to produce more accurate holes. By using all rest 3 method, we make the hole with almost accuracy. But for final finish and extremely high accuracy, reaming is performed at the last.
7. Tapping is a forming process.
a) true
b) false
View Answer
Explanation: As per the definition of taping process. The main advantage of taping is that is requires less operating conditions.
8. Which of the following process requires abundant coolant?
a) drilling
b) tapping
c) boring
d) none of the mentioned
View Answer
Explanation: Tapping needs abundant coolant. Cutting fluid is the coolant generally designed for metal working process.Different types of fluids are there like oil, gel, aerosols and so on.
9. Tapping process is carried out on ______ machines.
a) drilling
b) tapping
c) both drilling and tapping
d) none of the mentioned
View Answer
Explanation: Tapping process is carried out on both drilling and tapping machines. Taper is a shape which is produced and it has different diameter at both the ends
10. Which of the following operation is carried out for cutting internal threads?
a) drilling
b) tapping
c) boring
d) none of the mentioned
View Answer
Explanation: Tapping is carried out for cutting internal threads because tapping process generally don’t need high operating conditions. They require less operating conditions.
Sanfoundry Global Education & Learning Series – Machine Tools and Machining.
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