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Free download in PDF Tool Life Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
The ascending order of evolution of materials used for making the cutting tools is
[A]
stone – bronze – iron – steel
[B]
bronze – stone – steel – iron
[C]
iron – steel – bronze – stone
[D]
bronze – stone – steel – iron
Answer: stone – bronze – iron – steel
(2)
Which of the following is second hardest substance known?
[A]
Diamond
[B]
Cubic Boron Nitride (CBN)
[C]
Cermets
[D]
Ceramics
Answer: Cubic Boron Nitride (CBN)
(3)
In blanking operation, the clearance is provided on.......
[A]
Punch
[B]
May br provided on any member
[C]
Half on die and half on punch
[D]
None of the above
(4)
In piercing operation,the clearence is provided on......
[A]
Half on die and half on punch
[B]
Punch
[C]
Die
[D]
none of the mentioned
(5)
In bending operation, the metal takes shape of.........
[A]
Could take any shape
[B]
Die
[C]
Punch
[D]
None of the above
(6)
In drawing operation, increase of die radius.......
[A]
Punch load depends on other factors
[B]
Has much influnce on punch load and it decreases
[C]
Does not influnce the punch load much
[D]
Punch load increases
Answer: Has much influnce on punch load and it decreases
(7)
In drawing operation, increase of punch radius.......
[A]
Punch load depends on other factors
[B]
Punch load increases
[C]
Does not influnce the punch load much
[D]
None of the above
Answer: Does not influnce the punch load much
(8)
The front rake required to machine brass by H.S.S. tool is.......
[A]
0o
[B]
5o
[C]
10o
[D]
None of the above
(9)
Which of the following tools are generally manufactured by Powder metallurgy?
[A]
Cemented carbides
[B]
High carbon steel
[C]
Abrasives
[D]
Low carbon steel
Answer: Cemented carbides
(10)
Which of the following is hardest known material?
[A]
Diamond
[B]
Cubic boron nitride (CBN)
[C]
Ceramics
[D]
Cemented carbide
(11)
Corrundum is a/an
[A]
Abrasive
[B]
Ceramic
[C]
Diamond
[D]
None of the above
(12)
The cutting tool wears due to
[A]
Flank wear
[B]
Crater wear
[C]
Edge wear
[D]
All of the above
(13)
The built up edge in cutting tools can be eliminated by
[A]
High pressure cutting fluid
[B]
Higher rake angles
[C]
Fast cutting speed
[D]
All of the above
(14)
The cutting speed of High speed steels is ___ times faster than Carbon steel
[A]
4
[B]
8
[C]
6
[D]
None of the above
(15)
Which of the following cutting tool has highest hot hardness?
[A]
Carbon tool steel
[B]
Cast alloys
[C]
Ceramics
[D]
High speed steels
(16)
Which of the following cutting conditions greatly affects the tool wear?
[A]
Depth of cut
[B]
Feed
[C]
Cutting speed
[D]
None of the above is correct.
(17)
In a single point turning operation with a cemented carbide and steel combination having a Taylor exponent of 0.25, if the cutting speed is halved, then the tool life will become
[A]
Eight times
[B]
Sixteen times
[C]
Half
[D]
Two times
(18)
A drill bit of 20mm diameter rotating at 500 rpm with a feed rate of 0.2 mm/revolution is used to drill a through hole in Mild Steel plate of 20mm thickness. The depth of cut in this drilling operation is
[A]
10 mm
[B]
0.2 mm
[C]
100 mm
[D]
20 mm
(19)
The tool life increases with the
[A]
Decrease in back rake angle
[B]
Increase in side cutting edge angle
[C]
Decrease in side rake angle
[D]
Decrease in nose radius
Answer: Increase in side cutting edge angle
(20)
In the Taylor’s tool life equation, VT^n = C, the value of n=0.5. The tool life has a life of 180 minutes at a cutting speed of 18 m/min. If the tool life is reduced to 45 minutes, then the cutting speed will be
[A]
36 m/min
[B]
72 m/min
[C]
18 m/min
[D]
9 m/min
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