Engineering Materials - Materials, Manufacturing and Industrial Engineering - Mechanical Engineering Previous Year Questions

1

2007 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Engineering Materials

Mechanical Engineering (ME) 2007

If a particular Fe-C alloy contains less than 0.83% carbon, it is called

A

high speed steel

B

hypoeutectoid steel

C

hypereutectoid steel

D

cast iron

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2

2010 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Engineering Materials

Mechanical Engineering (ME) 2010

The material property which depends only on the basic crystal structure is

A

fatigue strength

B

work hardening

C

fracture strength

D

elastic constant

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3

2011 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Engineering Materials

Mechanical Engineering (ME) 2011

The operation in which oil is permeated into the pores of a powder metallurgy product is known as

A

mixing

B

sintering

C

impregnation

D

infiltration

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4

2011 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Engineering Materials

Mechanical Engineering (ME) 2011

The crystal structure of austenite is

A

body centered cubic

B

face centered cubic

C

hexagonal closed packed

D

body centered tetragonal

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5

2014 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Engineering Materials

Mechanical Engineering (ME) 2014 [Session 1]

The process of reheating the martensitic steel to reduce its brittleness without any significant loss in its hardness is

A

normalising

B

annealing

C

quenching

D

tempering

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6

2014 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Engineering Materials

Mechanical Engineering (ME) 2014 [Session 4]

Match the heat treatment processes (Group A) and their associated effects on properties (Group B) of medium carbon steel

A

P-III, Q-IV, R-II, S-I

B

P-II, Q-III, R-IV, S-I

C

P-III, Q-II, R-IV, S-I

D

P-II, Q-III, R-I, S-IV

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7

2016 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Engineering Materials

Mechanical Engineering (ME) 2016 [Session 1]

The “Jominy test” is used to find

A

Young’s modulus

B

hardenability

C

yield strength

D

thermal conductivity

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8

2016 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Engineering Materials

Mechanical Engineering (ME) 2016 [Session 2]

In the phase diagram shown in the figure, four samples of the same composition are heated to temperatures marked by a, b, c and d. At which temperature will a sample get solutionized the fastest?

A

a

B

b

C

c

D

d

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9

2016 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Engineering Materials

Mechanical Engineering (ME) 2016 [Session 2]

In a binary system of A and B, a liquid of 20% A (80% B) is coexisting with a solid of 70% A (30% B). For an overall composition having 40% A, the fraction of solid is

A

0.40

B

0.50

C

0.60

D

0.75

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10

2019 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Engineering Materials

Mechanical Engineering (ME) 2019 [Session 2]

The binary phase diagram of metals P and Q is shown in the figure. An alloy X containing 60% P and 40% Q (by weight) is cooled from liquid to solid state. The fractions of solid and liquid (in weight percent) at 1250 °C, respectively, will be

A

77.8% and 22.2%

B

22.2% and 77.8%

C

68.0% and 32.0%

D

32.0% and 68.0%

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11

2020 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Engineering Materials

Mechanical Engineering (ME) 2020 [Session 1]

The crystal structure of γ iron (austenite phase) is

A

BCC

B

FCC

C

HCP

D

BCT

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12

2020 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Engineering Materials

Mechanical Engineering (ME) 2020 [Session 2]

Which one of the following statements about a phase diagram is INCORRECT?

A

It indicates the temperature at which different phases start to melt

B

Relative amount of different phases can be found under given equilibrium conditions

C

It gives information on transformation rates

D

Solid solubility limits are depicted by it

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13

2023 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Engineering Materials

Mechanical Engineering (ME) 2023

The atomic radius of a hypothetical face-centered cubic (FCC) metal is \( (\sqrt{2}/10) \) nm. The atomic weight of the metal is 24.092 g/mol. Taking Avogadro’s number to be \( 6.023 \times 10^{23} \) atoms/mol, the density of the metal is ______ kg/m³.
(Answer in integer)

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14

2023 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Engineering Materials

Mechanical Engineering (ME) 2023

A steel sample with 1.5 wt.% carbon (no other alloying elements present) is slowly cooled from 1100 °C to just below the eutectoid temperature (723 °C). A part of the iron-cementite phase diagram is shown in the figure. The ratio of the pro-eutectoid cementite content to the total cementite content in the microstructure that develops just below the eutectoid temperature is ______.
(Rounded off to two decimal places)

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15

2024 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Engineering Materials

Mechanical Engineering (ME) 2024

The phases present in pearlite are

A

austenite and ferrite

B

cementite and austenite

C

ferrite and cementite

D

martensite and ferrite

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16

2025 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Engineering Materials

Mechanical Engineering (ME) 2025

Among the following surface hardening processes, steel is heated to the lowest temperature in

A

carburizing

B

cyaniding

C

nitriding

D

carbonitriding

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