Introduction to Metallurgy MCQ Questions and Answers | Metallurgical Engineering Page-3 section-1

21.
Powder metallurgy is used to produce

A. high precision components with complex cavities and sharp features

B. components of large size

C. porosity free components

D. components of such alloys whose constituents do not form alloys readily

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22.
Which of the following has maximum penetrating power?

A. Ultraviolet radiation

B. Microwaves

C. γ-rays

D. Radio waves

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23.
Match the powder production technique given in Group I with the corresponding shape listed in Group II.

Group-I Group-II

P. reduction 1. Flaky

Q. Gas Atomization 2. Spongy

R. Milling 3. Dendritic

S. Electrolysis 4. Spherical

A. P-2, Q-4, R-1, S-3

B. P-1, Q-3, R-2, S-4

C. P-2, Q-3, R-4, S-1

D. P-3, Q-2, R-1, S-4

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24.
When load is applied to a material, instantaneous strain develops with

A. the speed of light

B. half the speed of sound

C. the speed of sound

D. infinite speed

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25.
Coating of zine over steel is known as

A. cladding

B. galvanising

C. anodising

D. passivation

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26.
What is the theoretical requirement of air (in m³ at STP) for the complete combustion of 100 m³ (at STP) of a fuel consisting of pure CH₄? Assume that air contains 21 vol.% of oxygen.

A. 386

B. 488

C. 805

D. 952

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Answer & Solution

Answer: Option D

Solution:

Let's break down this question step by step to understand how to solve it.

First, we need to know what happens when CH₄ (Methane) burns completely. This process is called complete combustion.
The chemical reaction for the complete combustion of methane is:
CH₄ + O₂ → CO₂ + H₂O

This equation isn't balanced yet. We need to make sure the number of atoms of each element is the same on both sides of the arrow. Let's balance it:
CH₄ + 2O₂ → CO₂ + 2H₂O
This balanced equation tells us that 1 molecule of Methane (CH₄) reacts with 2 molecules of Oxygen (O₂) to produce 1 molecule of Carbon Dioxide (CO₂) and 2 molecules of Water (H₂O).

Since the volumes are given at STP (Standard Temperature and Pressure), a very important principle applies: equal volumes of all gases contain the same number of molecules at STP. This means we can directly use the volume ratios from the balanced chemical equation.
So, the balanced equation tells us: 1 volume of CH₄ needs 2 volumes of O₂.

The question states we have 100 m³ of pure CH₄.
Therefore, the amount of Oxygen needed for its complete combustion will be:
Oxygen needed = 100 m³ CH₄ * (2 volumes O₂ / 1 volume CH₄)
Oxygen needed = 200 m³ O₂.

Now, we need to find out how much air is required to supply this 200 m³ of oxygen.
The question tells us that air contains 21 vol.% of oxygen. This means that out of every 100 m³ of air, only 21 m³ is oxygen.

We need 200 m³ of oxygen. Let's set up a proportion to find the total volume of air needed:
If 21 m³ O₂ is present in 100 m³ Air,
Then 1 m³ O₂ is present in (100 / 21) m³ Air.
So, 200 m³ O₂ will be present in (100 / 21) * 200 m³ Air.

Let's calculate the total air required:
Air needed = (200 * 100) / 21
Air needed = 20000 / 21
Air needed ≈ 952.38 m³

Comparing this calculated value with the given options, the closest and correct answer is 952 m³.

Therefore, the correct option is Option D: 952.

27.
The temperature field od a slab is given by T = 400 - 50z exp (-t-x²-y²). The temperature gradient in y-direction is

A. 100yz exp (-t-x²-y²)

B. -100yz exp(-t-x²-y²)

C. 100xz exp(-t-x²-y²)

D. -100xz exp(-t-x²-y²)

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28.
Match the following materials with the method most commonly used for making their powders.

A. Nickel 1. Carbothermic reduction

B. Tungsten 2. Inert gas atomisation

C. Silicon carbide 3. Oxide reduction

D. Super alloys 4. Carbonyl process

A. A-2, B-3, C-4, D-1

B. A-1, B-3, C-4, D-2

C. A-2, B-3, C-1, D-4

D. A-4, B-3, C-2, D-1

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29.
Alloy powders manufactured by the following process have spherical shapes:

A. Electro-chemical deposition

B. Gaseous reduction

C. Atomisation

D. Mechanical attrition

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30.
The steady state temperature profile of a rectangular sheet of metal inside a furnace can be obtained by solving the following partial differential equation;
$$\frac{{{\delta ^2}T}}{{\delta {x^2}}} + \frac{{{\delta ^2}T}}{{\delta {y^2}}} = 0$$
The number of boundary conditions needed to solve this equation are:

A. one in x-direction, one in y-direction

B. two in x-direction, two in y-direction

C. two in any of the two directions

D. four in any of the two directions

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Group-I	Group-II
P. reduction	1. Flaky
Q. Gas Atomization	2. Spongy
R. Milling	3. Dendritic
S. Electrolysis	4. Spherical

A. Nickel	1. Carbothermic reduction
B. Tungsten	2. Inert gas atomisation
C. Silicon carbide	3. Oxide reduction
D. Super alloys	4. Carbonyl process

Introduction to Metallurgy MCQ Questions and Answers | Metallurgical Engineering

21. Powder metallurgy is used to produce

Answer & Solution

22. Which of the following has maximum penetrating power?

Answer & Solution

23. Match the powder production technique given in Group I with the corresponding shape listed in Group II. Group-I Group-II P. reduction 1. Flaky Q. Gas Atomization 2. Spongy R. Milling 3. Dendritic S. Electrolysis 4. Spherical

Answer & Solution

24. When load is applied to a material, instantaneous strain develops with

Answer & Solution

25. Coating of zine over steel is known as

Answer & Solution

26. What is the theoretical requirement of air (in m3 at STP) for the complete combustion of 100 m3 (at STP) of a fuel consisting of pure CH4? Assume that air contains 21 vol.% of oxygen.

Answer & Solution

27. The temperature field od a slab is given by T = 400 - 50z exp (-t-x2-y2). The temperature gradient in y-direction is

Answer & Solution

28. Match the following materials with the method most commonly used for making their powders. A. Nickel 1. Carbothermic reduction B. Tungsten 2. Inert gas atomisation C. Silicon carbide 3. Oxide reduction D. Super alloys 4. Carbonyl process

Answer & Solution

29. Alloy powders manufactured by the following process have spherical shapes:

Answer & Solution

Answer & Solution

21.
Powder metallurgy is used to produce

22.
Which of the following has maximum penetrating power?

23.
Match the powder production technique given in Group I with the corresponding shape listed in Group II.

Group-I Group-II

P. reduction 1. Flaky

Q. Gas Atomization 2. Spongy

R. Milling 3. Dendritic

S. Electrolysis 4. Spherical

24.
When load is applied to a material, instantaneous strain develops with

25.
Coating of zine over steel is known as

26.
What is the theoretical requirement of air (in m³ at STP) for the complete combustion of 100 m³ (at STP) of a fuel consisting of pure CH₄? Assume that air contains 21 vol.% of oxygen.

27.
The temperature field od a slab is given by T = 400 - 50z exp (-t-x²-y²). The temperature gradient in y-direction is

28.
Match the following materials with the method most commonly used for making their powders.

A. Nickel 1. Carbothermic reduction

B. Tungsten 2. Inert gas atomisation

C. Silicon carbide 3. Oxide reduction

D. Super alloys 4. Carbonyl process

29.
Alloy powders manufactured by the following process have spherical shapes: