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Test: Mechanical Properties - 3 - Mechanical Engineering MCQ


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20 Questions MCQ Test Topicwise Question Bank for Mechanical Engineering - Test: Mechanical Properties - 3

Test: Mechanical Properties - 3 for Mechanical Engineering 2024 is part of Topicwise Question Bank for Mechanical Engineering preparation. The Test: Mechanical Properties - 3 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Mechanical Properties - 3 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Mechanical Properties - 3 below.
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Test: Mechanical Properties - 3 - Question 1

Brittle fracture is more dangerous than ductile fracture because

Test: Mechanical Properties - 3 - Question 2

Failure due to excessive deformation is controlled by

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Test: Mechanical Properties - 3 - Question 3

Fracture voids usually form at

Test: Mechanical Properties - 3 - Question 4

Most often machine components fail by

Test: Mechanical Properties - 3 - Question 5

Creep rate in ternary stage

Test: Mechanical Properties - 3 - Question 6

Ternary stage creep is associated with

Detailed Solution for Test: Mechanical Properties - 3 - Question 6


Primary Creep: This stage is mainly due to dislocation movement. The creep rate decreases with time and the effect of work hardening is more than that of the recovery process.
Secondary Creep: The rates of work hardening and recovery during this stage are equal, so the material creeps at a steady rate (minimum creep rate).
Ternary Creep: Creep rate increases with time until fracture occurs at this stage. Tertiary creep can occur due to necking of the specimen or grain boundary sliding at high temperature and this continues until specimen fractures.

Test: Mechanical Properties - 3 - Question 7

Creep curve for viscous creep is shown by

Test: Mechanical Properties - 3 - Question 8

Fatigue strength for non-ferrous materials is defined at X stress cycles. The value of X is

Detailed Solution for Test: Mechanical Properties - 3 - Question 8

For all ferrous metals tested, and for most non-ferrous metals, these S-N diagrams become almost horizontal for values of N ranging from 1 x 106 to 5 x 107 cycles, thus indicating a well-defined endurance limit. We must note that the number of cycles are arbitrarily taken.

Test: Mechanical Properties - 3 - Question 9

The destruction of the metal under the fatigue and corrosion is called

Test: Mechanical Properties - 3 - Question 10

Consider the following effects of yield point:
1. Luders bands
2. Strain ageing
3. Blue brittleness
4. Orange peel effect
Q. Which of the above are true?

Detailed Solution for Test: Mechanical Properties - 3 - Question 10

Luders Bands: These represents the marking on the surface of a tensile test sample, formed at the points of stress concentration like fillets.
Strain Ageing: It refers to changes in the properties of an over strained alloy with time. Strain ageing or strain-age-hardening is accompanied by hardening due to increase in stress value.
Blue Brittleness: When the temperature range of the test is raised, the yield point becomes less pronounced and blue brittleness effect is produced.
Orange Peel effects: During stretching, these markings appear on metals.

Test: Mechanical Properties - 3 - Question 11

The yield strength σInternal frictional stress σand diameters of grain d are related as

Test: Mechanical Properties - 3 - Question 12

Brinell hardness number is expressed by the equation
where, L = Load in kg
D = Dia of. ball in mm
d = dia of indentation in mm

Test: Mechanical Properties - 3 - Question 13

The property of material which enables it to retain the deformation permanently is called

Detailed Solution for Test: Mechanical Properties - 3 - Question 13

Plasticity is that property of a material by virtue of which it may be permanently deformed when it has been subjected to an externally applied force great enough to exceed the elastic limit.

Test: Mechanical Properties - 3 - Question 14

A material to be rolled or beaten into thin sheets have this property

Detailed Solution for Test: Mechanical Properties - 3 - Question 14

The ability of metal to be formed by hammering or rolling is called malleability.

Test: Mechanical Properties - 3 - Question 15

The ductility of a material with work hardening

Test: Mechanical Properties - 3 - Question 16

Which one of the following metal would work- harden more quickly than the others

Test: Mechanical Properties - 3 - Question 17

Material exhibiting time bound behaviour are known as

Test: Mechanical Properties - 3 - Question 18

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

Test: Mechanical Properties - 3 - Question 19

Match List-I with List-ll and select the correct answer using the codes given below the lists:
List-I
A. Malleability
B. Hardness
C. Resilience
D. Plasticity
List-ll
1. Absorb energy elastically
2. Resistance against deformation
3. Making sheets
4. Permanent deformation
Codes:
    A B C D
(a) 3 4 2 1
(b) 4 3 1 2
(c) 1 2 3 4
(d) 3 2 1 4

Detailed Solution for Test: Mechanical Properties - 3 - Question 19

Resilience is the property of material to absorb energy when it is deformed elastically.
Plasticity is the property by virtue of which it can be deformed permanently.
Hardness is. the resistance against indentation or scratch.
Malleability is the property by which metal can be drawn in the form of sheets.

Test: Mechanical Properties - 3 - Question 20

Among the following material properties at room temperature
P. Ductility
Q. Modulus of Elasticity
R. Hardness
S. Thermal conductivity
Q. Microstructure sensitive properties are:

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