Mechanical Property Testing - Characterization and Measurements of Properties - Engineering Sciences Previous Year Questions

1

2007 · Engineering Sciences · Characterization and Measurements of Properties · Mechanical Property Testing

Engineering Sciences (XE) 2007

In a tensile test, necking starts at

A

lower yield point

B

upper yield point

C

ultimate tensile stress

D

proof stress

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2

2008 · Engineering Sciences · Characterization and Measurements of Properties · Mechanical Property Testing

Engineering Sciences (XE) 2008

Toughness is a measure of

A

the stress required to fracture a material

B

the strain required to fracture a material

C

the energy required to fracture a material

D

the energy required to plastically deform a material

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3

2008 · Engineering Sciences · Characterization and Measurements of Properties · Mechanical Property Testing

Engineering Sciences (XE) 2008

The ultimate tensile strength of the material is

A

207 MPa

B

247 MPa

C

222 MPa

D

267 MPa

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4

2008 · Engineering Sciences · Characterization and Measurements of Properties · Mechanical Property Testing

Engineering Sciences (XE) 2008

A carbon fiber-epoxy bar of dimensions (0.5m x 0.04m x 0.04m) gave a breaking load of 784N in a three point bending test. The flexural strength of the material is

A

15.8 MPa

B

9.2 MPa

C

0.3 GPa

D

108.1 GPa

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5

2009 · Engineering Sciences · Characterization and Measurements of Properties · Mechanical Property Testing

Engineering Sciences (XE) 2009

Match the polymer mechanical property with the appropriate testing method.

A

P. flexural strength - 1. notched Izod

B

Q. impact strength - 2. Shore-D

C

R. hardness - 3. ASTM D 638

D

S. tensile strength - 4. three-point bending

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6

2010 · Engineering Sciences · Characterization and Measurements of Properties · Mechanical Property Testing

Engineering Sciences (XE) 2010

Toughness of a plastic material can be judged from the area under the stress-strain curve obtained from tensile test. The plastic having the highest toughness exhibits

A

High tensile strength and low elongation

B

Low tensile strength and high elongation

C

High tensile strength and high elongation

D

Low tensile strength and low elongation

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7

2012 · Engineering Sciences · Characterization and Measurements of Properties · Mechanical Property Testing

Engineering Sciences (XE) 2012

Considering the stress-strain curve to be linear up to the break point, the tensile strength is

A

191.2 kg/cm²

B

208.3 kg/cm²

C

312.1 kg/cm²

D

535.5 kg/cm²

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8

2012 · Engineering Sciences · Characterization and Measurements of Properties · Mechanical Property Testing

Engineering Sciences (XE) 2012

In a three-point bending mode for flexural test of a polymer sample with the following data:
load applied in the mid-span = 80 kg
width of the specimen = 3 cm
depth of the specimen = 2 cm
length of the specimen = 30 cm
the flexural strength will be

A

17.5 MPa

B

29.4 MPa

C

35.7 MPa

D

41.3 MPa

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9

2013 · Engineering Sciences · Characterization and Measurements of Properties · Mechanical Property Testing

Engineering Sciences (XE) 2013

Find the toughness of the material, in M J m⁻³.

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10

2016 · Engineering Sciences · Characterization and Measurements of Properties · Mechanical Property Testing

Engineering Sciences (XE) 2016

Tensile force of 165 N is applied to a piece of vulcanized rubber of dimension 4 mm x 4 mm x 30 mm. If the sample is elongated by 50% of its original length under the same applied force, the true stress will be ______ MPa.

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11

2018 · Engineering Sciences · Characterization and Measurements of Properties · Mechanical Property Testing

Engineering Sciences (XE) 2018

A sintered sample was weighed in air and water using an analytical balance. The mass of the sample in air is 2.67 g and its apparent mass in water is 1.67 g. The density of the sample is ___________ \( \text{g cm}^{-3} \) (give answer up to 2 decimal places)
(Given: Density of water = 1.00 \( \text{g cm}^{-3} \))

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12

2020 · Engineering Sciences · Characterization and Measurements of Properties · Mechanical Property Testing

Engineering Sciences (XE) 2020

A tensile force of 160 N is applied to a piece of vulcanized rubber of dimension 30 mm × 4 mm × 4 mm. Assuming the vulcanized rubber to be incompressible, if the sample is elongated to 150% of its original length under the same applied force, the true stress in N mm^-2 will be ____________________ (round off to 1 decimal place).

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13

2021 · Engineering Sciences · Characterization and Measurements of Properties · Mechanical Property Testing

Engineering Sciences (XE) 2021

Vickers hardness test is performed with an indenter of square-base diamond pyramid having an included angle of 136° between the opposite faces of the pyramid. If the applied load is 10 kg and the average length of diagonals of square indentation is 0.5 mm, the Vickers hardness in kg mm⁻² is __________ (round off to nearest integer)

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14

2022 · Engineering Sciences · Characterization and Measurements of Properties · Mechanical Property Testing

Engineering Sciences (XE) 2022

Vickers microhardness (HV) of a ductile material A is higher than another ductile material B. Which of the following is/are true?

A

Young’s modulus of A is greater than B

B

Yield strength of A is greater than B

C

Scratch resistance of A is greater than B

D

Ductility of A is greater than B

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15

2023 · Engineering Sciences · Characterization and Measurements of Properties · Mechanical Property Testing

Engineering Sciences (XE) 2023

Match the hardness test (in Column I) with its indenter type (in Column II).

Column I	Column II
(P) Brinell	1. Diamond pyramidal
(Q) Rockwell	2. Diamond cone
(R) Vickers	3. Tungsten carbide sphere
	4. Steel sphere

A

P-2, Q-4, R-1

B

P-4, Q-2, R-3

C

P-3, Q-4, R-2

D

P-4, Q-2, R-1

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