Tool Life Multiple Choice Questions and Answers

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

View Answer

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

View Answer

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

View Answer

Answer: Punch

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

View Answer

Answer: Die

5 In bending operation, the metal takes shape of.........

A Could take any shape

B Die

C Punch

D None of the above

View Answer

Answer: Punch

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

View Answer

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

View Answer

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

View Answer

Answer: 0o

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

View Answer

Answer: Cemented carbides

10 Which of the following is hardest known material?

A Diamond

B Cubic boron nitride (CBN)

C Ceramics

D Cemented carbide

View Answer

Answer: Diamond

11 Corrundum is a/an

A Abrasive

B Ceramic

C Diamond

D None of the above

View Answer

Answer: Abrasive

12 The cutting tool wears due to

A Flank wear

B Crater wear

C Edge wear

D All of the above

View Answer

Answer: 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

View Answer

Answer: 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

View Answer

Answer: 4

15 Which of the following cutting tool has highest hot hardness?

A Carbon tool steel

B Cast alloys

C Ceramics

D High speed steels

View Answer

Answer: Ceramics

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.

View Answer

Answer: Cutting speed

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

View Answer

Answer: Sixteen 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

View Answer

Answer: 10 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

View Answer

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

View Answer