This set of Machine Tools Multiple Choice Questions & Answers (MCQs) focuses on “Lathe : Centers-2”.
1. Half centre is also known as common type centre.
a) true
b) false
View Answer
Explanation: This is false. Ordinary centre is also known as common type centre.
2. Which type of centre is used while facing the job without disturbing the setting?
a) ball centre
b) pipe centre
c) half centre
d) revolving centre
View Answer
Explanation: Half centre is used while facing the job without disturbing the setting as per the classification of the lathe centres. Though it is termed as half centre, little less than half is relieved at the tip portion.
3. The centres take up_______
a) thrust due to metal cutting
b) entire load of the work piece on small bearing surface
c) thrust due to metal cutting and entire load of the work piece on small bearing surface both
d) none of the mentioned
View Answer
Explanation: The centres take up the thrust due to metal cutting and load on small bearing surface. So they are made of very hard materials.
4. A carbide or a hard alloy tip is brazed into an ordinary steel shank. For which type of centre, above sentence is true?
a) pipe centre
b) half centre
c) female centre
d) tipped centre
View Answer
Explanation: Above statement is true for the tipped centre as per the definition of the tipped centre. The hard tip is wear resistant in case of tipped centre. For tipped centres, a tip tool is there which is made of separate material clamped on separate body.
5. The live centre is subjected to wear due to friction.
a) true
b) false
View Answer
Explanation: This is false. The dead centre is subjected to wear due to friction.
6. In which type of lathe centre, minimum wear and strain are obtained?
a) pipe centre
b) ball centre
c) insert-type centre
d) none of the mentioned
View Answer
Explanation: In ball centre, minimum wear and strain are obtained. This ball centre is particularly suitable for taper turning.
7. In pipe centre, friction is there.
a) true
b) false
View Answer
Explanation: This is false. Pipe centre is frictionless. It is used for supporting pipes shells and hollow end jobs.
8. In revolving centre, a high speed steel inserted centre is supported by_____ bearings housed in a body.
a) 1
b) 3
c) 2
d) none of the mentioned
View Answer
Explanation: In revolving centre, a high speed steel inserted centre is supported by 2 bearings housed in a body as per the definition of the revolving centre. It is used for heavy jobs and jobs revolving with high speeds.
9. Revolving centre is also known as revolving live centre.
a) true
b) false
View Answer
Explanation: This is false. Revolving centre is also known as revolving dead centre.
10. Which of the following centre is more economical?
a) insert-type centre
b) pipe centre
c) half centre
d) none of the mentioned
View Answer
Explanation: Insert-type centre is more economical as per the definition of this centre. In this centre, only the small high-speed steel insert is replaced.
11. Which type of centre is used while machining the entire length
of the job in one setting?
a) swivel V centre
b) female centre
c) self-driving live centre
d) pipe centre
View Answer
Explanation: Self-driving live centre is used while machining the entire length of the job in one setting as per the working of this centre. Self driving live centre is usually mounted on the headstock.
12. Which type of centre is used to support the end of the job
where no countersink hole is permitted?
a) ordinary centre
b) half centre
c) female centre
d) none of the mentioned
View Answer
Explanation: Female centre is used to support the end of the job where no countersink hole is permitted as per the definition of this centre. Here, countersink hole means a conical hole cut into an object.
13. Which of the following is not the type of lathe centre?
a) pipe centre
b) revolving centre
c) insert-type centre
d) none of the mentioned
View Answer
Explanation: All are the types of lath centres. Insert type centre is more economical compare to other centres.
14. Self-driving live centre is usually mounted on the tailstock.
a) true
b) false
View Answer
Explanation: This is false. Self-driving live centre is usually mounted on the head stock spindle.
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