Chemistry · Science General

Metallurgical Processes

1,436 Questions

This section explores key metallurgical processes including ore concentration, pyrometallurgy, and metal refining. It also covers corrosion and the properties of refractory materials. These chemistry questions are relevant for engineering and science entrance tests.

Pyrometallurgy furnacesMetal refining techniquesCorrosion protection methodsOre concentrationAuto reduction process

Metallurgical Processes Questions

Multiple choice

Match the heat treatment processes (Group A) and their associated effects on properties (Group B) of medium carbon steel

     
Group A Group B
P Tempering I Strengthening and grain refinement
Q Quenching II Inducing toughness
R Annealing III Hardening
S Normalizing IV Softening

  1. P - III, Q - IV, R - II, S - I

  2. P - II, Q - III, R - IV, S - I

  3. P - III, Q - II, R - IV, S - I

  4. P - II, Q - III, R - I, S - IV
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

(P) Tempering is process of inducing toughness. (Q) Quenching is done to make metal hard & main objective is to produce martensite (R) Annealing is done to soften the material & Quenching medium of annealing is Furnace. (S) Normalizing refined the grain structure & strengthened the material. Quenching medium of annealing is air.

Multiple choice

The major difficulty during welding of aluminium is due to its

  1. high tendency of oxidation

  2. high thermal conductivity

  3. low melting point

  4. low density
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Aluminium has high tendency of oxidation so during welding it is converted into aluminium oxide (Al2O3) and Al2O3 has very high melting point (2702oC) so now it will not melt and welding can not be performed easily.

Multiple choice

Which one among the following welding processes uses non-consumable electrode?

  1. Gas metal arc welding

  2. Submerged arc welding

  3. Gas tungsten arc welding

  4. Flux coated arc welding
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

GTAW is also called as Tungsten Inert Gas Welding (TIG). The arc is maintained between the work piece and a tungsten electrode by an inert gas. The electrode is non-consumable since its melting point is about $3400^0C.$

Multiple choice

Match the following non-traditional machining processes with the corresponding material removal mechanisms:

Mechanical process| Mechanism of material removal| | P. Chemical machining| 1. Erosion| | Q. Electro-chemical machining| 2. Corrosive reaction| | R. Electro - discharge machining| 3. Ion displacement| | S. Ultrasonic machining| 4. Fusion and vapourization|

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

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

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

  4. P-2, Q-3, R-1, S-4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Multiple choice

When the temperature of a solid metal increases,

  1. strength of the metal decreases but ductility increases

  2. both strength and ductility of the metal decrease

  3. both strength and ductility of the metal increase

  4. strength of the metal increases but ductility decreases
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When the temperature of a solid metal increases, its intramolecular bonds are brake and strength of solid metal decreases. Due to decrease its strength, the elongation of the metal increases, when we apply the load i.e.ductility increases.

Multiple choice

The strength of a brazed joint

  1. decreases with increase in gap between the two joining surfaces

  2. increases with increase in gap between the two joining surfaces

  3. decreases up to certain gap between the two joining surfaces beyond which it increases

  4. increases up to certain gap between the two joining surfaces beyond which it decreases
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$\text{The strength of the brazed joint depend on (a) joint desing and (b) the adhesion at the interfaces between the workpiece and the filler metal.} \\ \text{The strength of the brazed joint increases up to certain gap between the two joining surfaces beyond which it decreases}$

Multiple choice

How does using a metal cookie sheet help with baking holiday cookies?

  1. metal is a good insulator of heat

  2. metal is a good conductor of heat

  3. metal helps block radiation

  4. metal prevents burning
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Metal is a material that allows heat to move through it efficiently, which is the definition of a thermal conductor. This helps bake cookies evenly.

Multiple choice

When using the blend, which modality should you start with?

  1. galvanic

  2. thermolysis

  3. both

  4. doesn’t matter
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In the blend modality, the order of starting the galvanic or thermolysis current is a matter of practitioner preference and technique, as both are applied simultaneously.