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Test: Structural of Metals & Alloys - 3 - Mechanical Engineering MCQ


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20 Questions MCQ Test - Test: Structural of Metals & Alloys - 3

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

When atoms are displaced in two separate planes perpendicular to each other, the defect so produced is known as

Detailed Solution for Test: Structural of Metals & Alloys - 3 - Question 1
  • When atoms are displaced in two perpendicular planes, this creates a complex distortion in the crystal structure.
  • This type of defect is classified as a stacking fault, which occurs when the regular order of atomic layers is disrupted.
  • Stacking faults can lead to changes in the material's properties, such as strength and ductility.
  • Edge dislocations and screw dislocations involve different types of atomic displacements, while Schottky defects relate to vacancies.
Test: Structural of Metals & Alloys - 3 - Question 2

Atomic packing factor in case of Copper Crystal is

Detailed Solution for Test: Structural of Metals & Alloys - 3 - Question 2

Since Copper .is having FCC structure APF = 0.74

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Test: Structural of Metals & Alloys - 3 - Question 3

The effective number of lattice points in the unit celi of simple cubic, body centered cubic and face centered cubic space lattices respectively are

Detailed Solution for Test: Structural of Metals & Alloys - 3 - Question 3

For simple cubic effective number of lattice point = 1
For B.C.C. effective number of lattice point = 2
For F.C.C. effective number of lattice point = 4

Test: Structural of Metals & Alloys - 3 - Question 4

Which of the following elements is not a metalloid?

Detailed Solution for Test: Structural of Metals & Alloys - 3 - Question 4

Correct option is A: Copper elements is not a metalloid. The known metalloids are boron, silicon, germanium.

Test: Structural of Metals & Alloys - 3 - Question 5

Which of the following material is not a ferromagnetic material?

Test: Structural of Metals & Alloys - 3 - Question 6

Which one of the following pairs of axis lengths (a, b, c) and inter axial angles (a, β, γ) represents the tetragonal crystal system?

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Test: Structural of Metals & Alloys - 3 - Question 7

The defect which takes place due to imperfect packing of atoms during crystallization is known as

Detailed Solution for Test: Structural of Metals & Alloys - 3 - Question 7

Point defects are where an atom is missing or is in an irregular place in the lattice structure.
Point defects include self interstitial atoms, interstitial impurity atoms, substitutional atoms and vacancies

Test: Structural of Metals & Alloys - 3 - Question 8

What is the movement of block of atoms along certain crystallographic phase and directions termed as

Detailed Solution for Test: Structural of Metals & Alloys - 3 - Question 8

Slip is defined as a irreversible shear displacement of one part of a crystal relative to another in a definite crystallographic direction and an a specific crystallographic plane.

Test: Structural of Metals & Alloys - 3 - Question 9

A screw dislocation
1. Lies parallel to its Burger’s vector
2. Lies perpendicular to its Burger’s vector
3. Moves in a perpendicular direction to the Burger’s vector
4. Moves in an inclined direction to the Burger’s vector
Q. Select the correct answer using the codes given below:

Detailed Solution for Test: Structural of Metals & Alloys - 3 - Question 9

Screw dislocation lies parallel to Burger vector and moves in perpendicular direction to Burger vector.
Edge dislocation - Burger vector in normal to dislocation line and movement will be parallel to Burger vector.

Test: Structural of Metals & Alloys - 3 - Question 10

The set of miller indices of the plane shown in the given figure is

Detailed Solution for Test: Structural of Metals & Alloys - 3 - Question 10

Intercept on y and z-axis is ∞. So taking reciprocal it will be 0, 0 on both y and z-axis. Intercept on x-axis is on the negative side of x-axis .

Test: Structural of Metals & Alloys - 3 - Question 11

Match List-I (Element) with List-ll (Crystal structure) and select the correct answer using the codes given below the lists:
List-I
A. Alpha Iron
B. Copper
C. Zinc
D. Glass
List-ll
1. Hexagonal closed packed
2. Body-centered cubic
3. Amorphous
4. Face-centered cubic
Codes:
    A B C D
(a) 2 3 1 4
(b) 1 4 2 3
(c) 2 4 1 3
(d) 1 3 2 4

Test: Structural of Metals & Alloys - 3 - Question 12

What is the planer density of (100) plane in FCC (face-centred cubic) crystal with unit cell side a equa! to?

Detailed Solution for Test: Structural of Metals & Alloys - 3 - Question 12

FCC on (100) plane

No. of atoms = 1/4 x 4 +1 = 2
Area = a x a = a2
Planar density = 2/a2

Test: Structural of Metals & Alloys - 3 - Question 13

A unit cell of a crystal is shown in given figure. The miller indices of the direction (arrow) shown in the figure is

Detailed Solution for Test: Structural of Metals & Alloys - 3 - Question 13

Test: Structural of Metals & Alloys - 3 - Question 14

Match List-I (Miller indices) with List-ll (Denotes) and select the correct answer using the codes given below the lists:
List-I
A. (h, k l)
B. [h k l]
C. {h k l}
D. <h k l>
List-ll
1. direction
2. plane
3. family of direction
4. Family of planes
Codes:
    A B C D
(a) 1 2 3 4
(b) 1 2 4 3
(c) 2 1 4 3
(d) 2 1 3 4

Test: Structural of Metals & Alloys - 3 - Question 15

Planar density in SC on (100) plane is

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Test: Structural of Metals & Alloys - 3 - Question 16

Planar density in BCC on (111) plane is

Detailed Solution for Test: Structural of Metals & Alloys - 3 - Question 16


Test: Structural of Metals & Alloys - 3 - Question 17

The linear density along the direction (110) will be equal to, if lattice constant of copper unit cell is 3.61 Å.

Detailed Solution for Test: Structural of Metals & Alloys - 3 - Question 17


= 3.91 x 109 atoms/m
ρ = 3.91 x 106 atoms/mm

Test: Structural of Metals & Alloys - 3 - Question 18

Miller indices of a plane will be whose intercepts are a, b/2 and 3c on x, y and z axes respectively in a simple cubic unit cell?

Test: Structural of Metals & Alloys - 3 - Question 19

Consider the following statements about screw dislocation
1. It forms when crystal displaces angulanly over the remaining parts
2. Burgers vector is parallel to screw dislocation line
3. Screw dislocations are symbolically represented by clockwise & anticiock-wise and reffered to negative & positive screw dislocation respectively
Q. Which of these statement are correct?

Test: Structural of Metals & Alloys - 3 - Question 20

Ratio of elastic strain energy of an edge dislocation to the screw dislocation is

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