Chemistry · Science General

Metallurgical Processes

1,403 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

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

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.

Multiple choice chemistry pure substances and mixtures: separation of mixtures mixtures: examples and properties types of solutions all about mixtures

Steel is a type of :

  1. Solid-liquid heterogeneous mixture

  2. Solid-solid heterogeneous mixture

  3. Solid-solid homogeneous mixture

  4. Pure substance
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Centrifugation is a technique which involves the application of centrifugal force to separated particles from a solution.Generally this is used in wasting machines to separated water particles from cloths during dry washing.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) uses of alkali and alkaline earth metals uses of s block elements group 1 elements: alkali metals

At night when the lights of a scooter or a car fall on a road-sign or on a vehicle moving ahead, the painted letters or numbers shine with a glow. Which of the following is a luminous paint?

  1. Nickel-chrome alloy

  2. Barium sulphide

  3. Silver-plated metal

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Barium sulphide can be employed as a short wavelength emitter for electronic displays and used in electronics, paint pigments, flame retardant, luminous paints, and producing pure hydrogen sulphide.
Multiple choice chemistry fluid pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

The powdered ore is agitated with water or washed with running stream of water. The heavy ore particles and lighter impurities are separated. This method of concentration is known as:

  1. metallurgy

  2. leaching

  3. gravity separation

  4. forth floatation process
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Hydraulic washing is based on the difference between specific gravities of the ore and the gangue particles. 
  • It is, therefore, a type of gravity separation. In one such process, an upward stream of running water is used to wash the powdered ore. 
  • The lighter gangue particles are washed away and the heavier ore particles are left behind.
Multiple choice chemistry fluid pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

The method of concentration of the ore that makes use of difference in density between ore and impurities is called __________.

  1. levigation

  2. leaching

  3. magnetic separation

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

Levigation is based on the difference in densities of the metallic ore and gangue particles. Powdered ore is treated with a stream of running water when the lighter gangue particles are washed away and heavier ore particles are left behind.

Multiple choice chemistry fluid pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

Hydraulic washing is based on the differences in ___________ of the ore and gangue particles.

  1. specific gravities

  2. mass

  3. type of material

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydraulic washing is a type of gravity separation, which is based on gravity differences between the ore and the gangue particles. In this process, the lighter gangue particles are washed away by a stream of water, leaving behind the heavier ore.

Multiple choice bio-chemistry biological oxidation classical idea of redox reactions oxidation reduction redox reaction

In the electrochemical series, metals are arranged in order of their tendency to :

  1. release halogens from their salts

  2. become reduced

  3. react with water

  4. lose electrons
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In the electrochemical series, metals are arrange in order of their tendency to lose electrons. 

$\bullet$ Oxidation potential increases down the group.(tendency to lose electron increases).
$\bullet$ Reduction potentials decreases down the group. (tendency to gain $e^-$ decreases).