Free Chemical Process Principles MCQs with Answers

• A. Calcium silicate
• B. Magnesium silicate
• C. Sand
• D. Iron pyrite

Explanation: Blast-furnace slag is formed mainly from the reaction of silica with lime, producing calcium silicates, along with smaller amounts of…

• A. 2.5
• B. 3.75
• C. 4.75
• D. 5.25

Explanation: Cast iron generally contains about 2.1 to 4.3% carbon, whereas steel contains less than roughly 2.1%.

• A. Ductile & resistant to corrosion/rusting
• B. Weldable easily
• C. Having uniform strength in all directions
• D. Having maximum tensile strength along the lines of slag distribution

Explanation: Wrought iron contains elongated slag fibres, so its strength is directional rather than uniform in all directions.

• A. Atomisation
• B. Grinding/milling
• C. Electrolytic deposition
• D. Hammering

Explanation: Common powder-production methods include atomisation, grinding or milling, and electrolytic deposition.

• A. Clearance between two mating surfaces
• B. Thickness of parts
• C. Depth of holes
• D. I.D. & O.D. of the shaft

Explanation: Vernier calipers measure outside and inside dimensions, thickness, and hole depth.

• A. Hard
• B. Aluminium oxide
• C. Silicon carbide
• D. Soft

Explanation: Aluminium oxide wheels are tough and retain their abrasive grains well, making them suitable for general-purpose grinding of…

• A. Rain
• B. Cold wave
• C. Storm
• D. Fair weather

Explanation: A large, sudden fall in atmospheric pressure usually signals the approach of a low-pressure system, which is associated with strong winds…

• A. Iron ore
• B. Iron scrap
• C. Limestone
• D. Pig iron

Explanation: A cupola normally uses pig iron and iron scrap as metallic charges, with coke as fuel and limestone as flux.

• A. Austenite
• B. Cementite
• C. Martensite
• D. Pearlite

Explanation: During heating, the transformation range is the interval in which the ferrite and pearlite structure changes into austenite.

• A. H2
• B. CCl4
• C. C2H2
• D. S

Explanation: Carbon tetrachloride is incombustible because its chlorine-containing molecular structure does not support ordinary combustion.

• A. Cermet
• B. High speed steel
• C. Stellite
• D. Alnico

Explanation: Stellite is the trade name for cobalt-based cast alloys containing chromium and usually tungsten, valued for wear and heat resistance.

• A. 1/3
• B. 1
• C. 1/2
• D. 0

Explanation: On a principal plane, the shear stress is zero by definition, leaving only normal principal stress.

• A. None of these
• B. Deflection value
• C. Fatigue resistance
• D. Elastic limit

Explanation: Spring materials require a high elastic limit and high fatigue resistance so they can store strain energy repeatedly without permanent…

• A. Chalcopyrite
• B. Azurite
• C. Cryolite
• D. Malachite

Explanation: Azurite, chalcopyrite and malachite are recognised copper ores or ore minerals.

• A. Point
• B. None of these
• C. Volume
• D. Line

Explanation: A dislocation is a one-dimensional lattice imperfection extending along a line in the crystal, so it is classified as a line defect.

• A. Abrasion resistance
• B. Hardness
• C. Compressive strength
• D. Impact strength

Explanation: The M10 index measures the percentage of small material produced when coke is subjected to abrasion in a rotating drum.

• A. Nickel
• B. Copper
• C. Chromium
• D. Silicon

Explanation: Copper is added to steel mainly to improve atmospheric corrosion resistance and strength, rather than as a principal hardening element.

• A. MgO
• B. FeO
• C. SiO2
• D. CaO

Explanation: Silica, SiO2, is an acidic oxide and combines with basic oxides in the blast furnace to form slag.

• A. Cementite
• B. Ferrite
• C. Martensite
• D. Pearlite

Explanation: At the eutectoid composition, austenite transforms into the lamellar mixture of ferrite and cementite called pearlite on cooling.

• A. Completely filled
• B. Partially filled
• C. Equally filled
• D. Vacant

Explanation: Ferromagnetism results from unpaired electrons in partially filled d or f subshells, whose magnetic moments can align in domains.