This set of Machine Tools Multiple Choice Questions & Answers (MCQs) focuses on “Classification of Drilling Machine : According to Material”
1. According to material, drill can be classified as_____
a) hss
b) carbides
c) bot hss and carbides
d) none of the mentioned
View Answer
Explanation: Both hss and carbides are classified according to material. In carbides, generally cemented carbide is mostly used.
2. HSS stands for high speed steel.
a) true
b) false
View Answer
Explanation: HSS is the acronym form of high speed steel. It is commonly used in tool bits and cutting tools.
3. HSS was introduced in______
a) 1895
b) 1905
c) 1915
d) none of the mentioned
View Answer
Explanation: It was introduced in 1915. It was introduced in U.S.A.
4. HSS was introduced by F.W. Taylor.
a) true
b) false
View Answer
Explanation: F.W. Taylor introduced the HSS. Full name of F.M. Taylor is Frederick Winslow Taylor.
5. Which of the following element is included in HSS?
a) tungsten
b) chromium
c) both tungsten and chromium
d) none of the mentioned
View Answer
Explanation: Both are included in HSS. Apart from tungsten and chromium, carbon and manganese are also included in HSS.
6. How much chromium is there in HSS?
a) 4
b) 14
c) 8
d) 18
View Answer
Explanation: As per the structure of HSS. In the starting mn was used but because of its some drawbacks cr took its place and today it is used.
7. How much tungsten is there in HSS?
a) 4
b) 14
c) 8
d) 18
View Answer
Explanation: About 18% tungsten is there in HSS. HSS gain its most of property from tungsten and molybdenum.
8. Which of the following quality does HSS has?
a) toughness
b) formability
c) tensile strength
d) all of the mentioned
View Answer
Explanation: These all are the qualities of HSS. This is used in milling cutters, taps, gear cutters etc.
9. Which of the following drill is produced power metallurgically?
a) hss
b) cemented carbides
c) diamond
d) none of the mentioned
View Answer
Explanation: As per the construction of cemented carbides. Powder metallurgy is a process in which components are made from metal powder.
10. Carbides are always coated tools.
a) true
b) false
View Answer
Explanation: This is false. It can be coated or uncoated. It is not mandatory that it must be coated.
11. Diamond is used for making very small holes in exotic materials.
a) true
b) false
View Answer
Explanation: It is the property of diamond. Though diamond is the hardest substance it can easily make holes in exotic materials.
12. Diamond tools are never used for machining steels.
a) true
b) false
View Answer
Explanation: This is true. If they are used for this purpose, then diamond will be graphitized.
Sanfoundry Global Education & Learning Series – Machine Tools and Machining.
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