Free Chemical Process Principles MCQs with Answers

• A. Insulator for heat & electricity transmission
• B. Ferritic
• C. Behave like paramagnetic materials
• D. Superconductor

Explanation: Above the Curie temperature, ferromagnetic domain alignment is lost and the material exhibits paramagnetic behaviour.

• A. Seamless & made of steel
• B. Heat treated before use
• C. Made by sand casting
• D. Welded steel cylinders

Explanation: High-pressure oxygen cylinders are made from seamless steel to avoid weld defects that could fail under pressure and to maintain gas…

• A. Spheroids
• B. Flakes
• C. Nodular aggregates of graphite
• D. Cementite

Explanation: In grey cast iron, carbon is mainly present as graphite flakes, which give the fractured surface its grey appearance and reduce tensile…

• A. 40 to 55
• B. 5 to 10
• C. 15 to 25
• D. 60 to 70

Explanation: CI engines use high compression ratios so that the air temperature rises sufficiently to ignite the injected fuel.

• A. Silica
• B. Alumina
• C. Fireclay
• D. Magnesia

Explanation: A basic electric arc furnace uses a basic refractory lining, and magnesia resists attack by basic slags.

• A. Copper
• B. Zinc
• C. Aluminium
• D. Lead

Explanation: Matte smelting is a pyrometallurgical step used mainly to extract copper, producing a molten sulphide matte that is later converted to…

• A. Martensitic
• B. Bainitic
• C. Carburised
• D. Stressed

Explanation: Austempering involves quenching steel to the bainite range and holding it there until transformation is complete.

• A. Cast iron
• B. Soft brass
• C. Round specimen of ductile metal
• D. Flat tensile specimen of ductile metal

Explanation: Cup-and-cone fracture is the characteristic ductile fracture of a round tensile specimen, produced by necking followed by shear at the…

• A. Get deflected by magnetic electric field
• B. Travel in a straight line
• C. Produce fluorescence
• D. Heat the exposed material

Explanation: Deflection by electric or magnetic fields shows that cathode rays carry charged particles, proving their particle nature.

• A. Jet of water at high pressure
• B. Rain of molten lead
• C. Mixture of water and air
• D. Blast of air

Explanation: In the Imperial Smelting Process, zinc vapour is condensed by contact with a rain of molten lead in the external condenser.

• A. Vapor pressure
• B. Saturated humidity
• C. Aqueous tension
• D. Absolute humidity

Explanation: Water vapour in a gas collected over water exerts its own partial pressure at the gas temperature.

• A. Temperature is low
• B. None of these
• C. Atmospheric pressure is high
• D. Atmospheric pressure is low

Explanation: Boiling occurs when a liquid's vapour pressure equals the surrounding pressure.

• A. None of these
• B. Very high which prevents their ignition by compression
• C. Zero
• D. Very low which prevents their ignition by compression

Explanation: Cetane number measures the readiness of a diesel fuel to ignite under compression, and alcohols have very low cetane numbers.

• A. Nodulising
• B. Balling
• C. Pelletising
• D. Briquetting

Explanation: Pelletising includes balling as a step for forming green pellets, so balling is not usually listed as a separate ore-agglomeration…

• A. Suppress martensite transformation
• B. Enhance its working performance in sub zero atmosphere
• C. Reduce the retained austenite in hardened steel
• D. Induce temper brittleness after its hardening

Explanation: Sub-zero treatment converts retained austenite into martensite after hardening, improving dimensional stability and hardness.

• A. Suspended salt
• B. Dissolved salt
• C. Turbidity
• D. Silica

Explanation: Silica is especially dangerous in high-pressure boilers because it can vaporize with steam and form hard, insulating deposits on turbine…

• A. Gamma rays & neutrons
• B. β-rays
• C. α-rays
• D. Electrons

Explanation: A reactor’s biological shield is designed mainly to attenuate highly penetrating gamma radiation and neutrons.

• A. Colour intensity
• B. Electrode potential
• C. pH value
• D. None of these

Explanation: A colour comparator estimates pH by comparing the colour produced by an indicator in the sample with standard colour references.

• A. 1.5
• B. 3
• C. 5
• D. 7

Explanation: For equal mass, blast-furnace slag occupies roughly three times the volume of hot metal because slag has a much lower density.

• A. Tungsten carbide
• B. High carbon steel
• C. High speed steel
• D. Drilling

Explanation: Powder metallurgy is particularly important for producing tungsten carbide cutting tools, since the very hard carbide particles can be…