GATE Prev Year : Engineering Materials Test-6

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Question 1

Match List-I (Name of the invariant reaction) with List-II (Critical load reaction during cooling) and select the correct answer using the code given below the lists:
List-I
[A]. Monotectic
[B]. Eutectic
[C]. Eutectoid
[D]. Peritectic
List-II
[1].
[2].
[3].
[4].

• AA-3, B-1, C-2, D-4
• BA-2, B-4, C-3, D-1
• CA-3, B-4, C-2, D-1
• DA-2, B-1, C-3, D-4

Question 2

Which one of the following pairs is not correctly matched? Where r is the atomic radius and a is the edge length of the lattice.

• ASimple cubic structure : a² = 4r²
• BBody-centred Cubic structure : a² = 16r²
• CTriclinic : 2a² = 3r²
• DFace-centred cubic structure : a² = 8r²

Question 3

Assertion (A):Carburizing is done on nonferrous alloys to increase the surface hardness.
Reason (R): Precipitation hardening of nonferrous alloys involves solution heat treatment followed by precipitation heat treatment.

• ABoth A and R are true and R is the correct explanation of A
• Bboth A and R are true but R is not a correct explanation of A
• CA is true but R is false
• DA is false but R is true

Question 4

Which of the following factors influence hardness in a plain carbon steel?
[1]. Percentage carbon
[2]. Quenching media
[3]. Work size
Select the correct answer using the code given below:

• A1 and 2 only
• B2 and 3 only
• C1 and 3 only
• D1, 2 and 3

Question 5

Match List-I (Material) with List-II (Application and select the correct answer using the code give below the lists:
List-I
[A]. Fibre reinforced plastics
[B]. Acrylics
[C]. Phenolics
[D]. Butadiene rubber
List-II
[1]. Automobile tyres
[2]. Aircraft
[3]. Lenses
[4]. Electric switch cover

• AA-1, B-4, C-3, D-2
• BA-2, B-3, C-4, D-1
• CA-1, B-3, C-4, D-2
• DA-2, B-4, C-3, D-1

Question 6

Match List-I (Steel) with List-II (Application) and select the correct answer using the codes give below the lists:
List-I
[A]. Mild Steel
[B]. Tool Steel
[C]. High Carbon Steel
[D]. Medium Carbon Steel
List-II
[1]. Ball bearing
[2]. Cold chisels
[3]. Shaft and axles
[4]. Rolled steel sections

• AA-2, B-1, C-4, D-3
• BA-4, B-3, C-2, D-1
• CA-2, B-3, C-4, D-1
• DA-4, B-1, C-2, D-3

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