Tool Life Objective Type Questions and Answers

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(21) The cutting velocity in m/sec, for turning a work piece of diameter 100 mm at the spindle speed of 480 rpm is

[A] 2.51

[B] 151

[C] 1.26

[D] 48

Answer: 2.51

(22) Which of the following tool materials have cobalt as a constituent element?

1. Tungsten carbide 2. CBN 3. Stellite 4. UCON

Select the correct answer using the codes given below

[A] 1 & 2

[B] 1 & 3

[C] 1 & 4

[D] 2 & 3

Answer: 1 & 3

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(23) The approximately variation of the tool life exponent ‘n’ of cemented carbide tools is

[A] 0.20 to 0.48

[B] 0.48 to 0.70

[C] 0.03 to 0.08

[D] None of the above

Answer: 0.20 to 0.48

(24) The coating materials for coated carbide tools, include

[A] TiC and TiN

[B] TiC and NaCN

[C] TiN and NaCN

[D] TiC, TiN and NaCN

Answer: TiC and TiN

(25) Which one of the following grinding wheels (with grade, grit and bond) is suitable for cutter grinding?

[A] T 60 resinoid

[B] T 320 resinoid

[C] K 60 vitrified

[D] None of the above

Answer: K 60 vitrified

(26) Using the Taylor equation VT^n=c, calculate the percentage increase in tool life when the cutting speed is reduced is reduced by 50% (n=0.5 and c=400)

[A] 300%

[B] 400%

[C] 100%

[D] 50%

Answer: 400%

(27) Consider the following actions:

1. Mechanical abrasion

2. Diffusion

3. Plastic deformation

4. Oxidation

Which of the above are the causes of tool wear?

[A] 2 & 3

[B] 1 & 2

[C] 1, 2 & 4

[D] 1 & 3

Answer: 1, 2 & 4

(28) Tool material not suited to resistance welding is

[A] Stellite

[B] Masonite

[C] High speed steel

[D] Aluminium oxide

Answer: Stellite

(29) Consider the following statements: Chipping of a cutting tool is due to

1. Tool material being too brittle

2. Hot hardness of the tool material

3. High positive rake angle of the tool

Which of these statements are correct?

[A] 1, 2 & 3

[B] 1 & 3

[C] 2 & 3

[D] 1 & 2

Answer: 1 & 3

(30) A milling cutter of 70 mm diameter with 12 teeth is operating at a cutting speed of 22 m/min and a feed of 0.05 mm/tooth. The feed rate per minute is

[A] 60 mm/min

[B] 6 mm/min

[C] 110 mm/min

[D] 35 mm/min

Answer: 60 mm/min

31 Tool life is most affected by machine.......

[A] Feed and depth

[B] Microstracture of material being cut

[C] Cutting speed

[D] Tool geometry

Answer: Cutting speed

32 Tool life is said to be over if.......

[A] Overheating and funning due to friction start

[B] Sudden increase in power and cutting force with chattering take place

[C] A poor surface finish is obtained

[D] All of the above

Answer: All of the above

33 Sanding is a process of removing metal surfaces or wood fibres by.........

[A] Cutting

[B] Planning

[C] Sawing

[D] Filling

Answer: Cutting

34 Sanding belts are made of cloth, coated with various grades of......

[A] Aluminium oxide

[B] Diamond

[C] Gravel

[D] None of the above

Answer: Aluminium oxide

35 The materials are added to cutting tools to increase their properties. Match the following

1. Tungsten a. Hardness

2. Carbon b. Hot hardness

3. Vanadium c. Wear resistance

The correct order is

[A] 1-b, 2-a, 3-c

[B] 1-c, 2-a, 3-b

[C] 1-b, 2-c, 3-a

[D] 1-a, 2-b, 3-c

Answer: 1-b, 2-a, 3-c

36 Which of the following is not a constituent of High speed steel?

[A] Ni

[B] Cr

[C] W

[D] None of the above is correct.

Answer: Ni

37 Match list-I (Cutting tool material) with List-II (Typical value of tool life exponent ‘n’ in the Taylor’s equation V.T^n=C) and select the correct answer using the codes given below the lists:

List I List II

a. HSS 1. 0.18

b. Cast alloy 2. 0.12

c. Ceramic 3. 0.25

d. Sintered carbide 4. 0.5

[A] a-1, b-2, c-3, d-4

[B] a-2, b-1, c-3, d-4

[C] a-2, b-1, c-4, d-3

[D] a-1, b-2, c-4, d-3

Answer: a-2, b-1, c-4, d-3

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