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Test: Mechanical Testing Of Materials - Mechanical Engineering MCQ


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10 Questions MCQ Test - Test: Mechanical Testing Of Materials

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Test: Mechanical Testing Of Materials - Question 1

In _________ test, there are two kinds of notches.

Detailed Solution for Test: Mechanical Testing Of Materials - Question 1
Tensile test doesn’t involve notches. In the Izod test, there is only one type of notch. In Charpy, there are two type notches of V and U type.

Test: Mechanical Testing Of Materials - Question 2

When a wire is subjected to an axial load then its length becomes 1.5 times of initial length, then what is the value of Young’s modulus?

Detailed Solution for Test: Mechanical Testing Of Materials - Question 2
Young’s modulus is material property that remains constant.

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Test: Mechanical Testing Of Materials - Question 3

Which of the following graph represents the correct relation between various hardness numbers and applied load?

Detailed Solution for Test: Mechanical Testing Of Materials - Question 3

Test: Mechanical Testing Of Materials - Question 4

During hardness test the indenter is usually a

Detailed Solution for Test: Mechanical Testing Of Materials - Question 4
The specimen is supported in Izod test. It is kept vertical in this case. Notch is facing the striking hammer.

Test: Mechanical Testing Of Materials - Question 5

A load of 2 N is applied on a specimen during hardness testing. Find the length of the diagonal of indenter in (mm) used in Knoop test.

Detailed Solution for Test: Mechanical Testing Of Materials - Question 5

HK =

P = = 0.2038 kg

300 =

L = 0.098 mm

Test: Mechanical Testing Of Materials - Question 6

Calculate the Vickers hardness number when a 3 kg load yields on indentation diagonal length of 0.10 mm.

Detailed Solution for Test: Mechanical Testing Of Materials - Question 6

VHN =

= 556.2

Test: Mechanical Testing Of Materials - Question 7

What is the indentation diagonal length when a load of 2 kg produces a Vickers hardness number VHN is 400.

Detailed Solution for Test: Mechanical Testing Of Materials - Question 7

VHN =

400 =

L = 0.096 mm

Test: Mechanical Testing Of Materials - Question 8

If a Rockwell test is performed and the depth of penetration is 60 mm and the load applied is 60 kg. Find the hardness number (HRA).

Detailed Solution for Test: Mechanical Testing Of Materials - Question 8
HRA = 100 − 500t = 100 − 500 × 0.06 = 70

Test: Mechanical Testing Of Materials - Question 9

If a material has a target hardness of 300 HB and a load of 2.6 kN is applied on a specimen of diameter 10 mm. Find the radius of indentation.

Detailed Solution for Test: Mechanical Testing Of Materials - Question 9
HB

=

P = = 265.03 kg

300 =

10 − √102 − d2 = 0.0562

9.943 = √102 − d2

d = 1.059

r = 0.529 mm

Test: Mechanical Testing Of Materials - Question 10

A load of 2.2 kN is applied on a specimen during hardness testing diameter of steel ball is 10 mm and radius of indentation is 0.65 mm. What will be the value of hardness?

Detailed Solution for Test: Mechanical Testing Of Materials - Question 10
D = 10 mm, d = 2 × 0.65 = 1.3 mm

BHN =

Here, load P is in kg, D and d are in mm.

P = = 224.26 kg

BHN =

= 168

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