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181.

The cutting tool material require to sustain high temperature is
(a) high carbon steel alloys
(b) composite of lead and steel
(c) cement
(d) alloy of steel, zinc and tungsten

asked in Mechanical Paper-2, 2010

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182.

Match List I and List II and select the correct answer using the codes given below the lists.

List I (Symbol for direction lay)
A. =
B. x
C. I
D. R
List II (Surface texture)

a. A→4, B→2, C→1, D→3
b. A→3, B→2, C→1, D→4
c. A→4, B→1, C→2, D→3
d. A→3, B→1, C→2, D→4

asked in Mechanical Paper-2, 2010

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183.

The above figure shows a typical relationship between tool life and cutting speed for different materials. Match the graphs for HSS, carbide, ceramic tool materials and select the correct answer using the code given below the lists.
a. HSS→1, Carbide→2, Ceramic→ 3
b. HSS→3, Carbide→2, Ceramic→ 1
c. HSS→1, Carbide→3, Ceramic→ 2
d. HSS→3, Carbide→1, Ceramic→ 2

asked in Mechanical Paper-2, 2010

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184.

Assertion (A): Natural crystals always contain defects.
Reason (R): The defects may affect colour and can make a crystal a valuable gem.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true and R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

asked in Mechanical Paper-2, 2010

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185.

Assertion (A): Polycrystalline material is stronger than ordinary one.
Reason (R): Crystals in polycrystalline materials have different orientations with respect to each other.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true and R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

asked in Mechanical Paper-2, 2010

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186.

Assertion (A): Most of the materials exists in single crystal.
Reason (R): Sugar is a single crystal structure.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true and R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

asked in Mechanical Paper-2, 2010

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