Free Plant Design and Economics MCQs with Answers

• A. Beryllium
• B. Copper
• C. Manganese
• D. Iron

Explanation: Nickel-manganese alloys retain strength and resist oxidation at the high temperatures encountered in spark-plug electrodes, ignition tubes…

• A. Strongly
• B. Only slightly
• C. With eddy currents only
• D. In a direction opposite to that of the applied field

Explanation: Diamagnetic substances develop only a weak induced magnetisation, and it is opposite to the applied magnetic field.

• A. Rubber lined
• B. Lead lined
• C. Glass lined
• D. Stainless

Explanation: Hydrochloric acid attacks ordinary steel, so a rubber lining is used to isolate the acid from the vessel wall.

• A. High carbon steel
• B. Platinum or gold alloys
• C. Aluminium
• D. Nickel

Explanation: Platinum and gold alloys withstand the corrosive viscose dope and can be formed with the very fine, accurately spaced holes required in…

• A. Fast hydration
• B. Fast oxidation
• C. Slow oxidation
• D. Slow dehydration

Explanation: Atmospheric corrosion commonly involves the gradual oxidation of a metal in the presence of moisture and oxygen.

• A. Withstand compression
• B. None of these
• C. Absorb shock
• D. Absorb vibration

Explanation: Damping capacity measures how effectively a material dissipates vibrational energy, so it indicates the ability to absorb vibration.

• A. Lead or glass
• B. Karbate
• C. Fireclay bricks
• D. PVC

Explanation: The chlorination mixture is highly corrosive, so the photochemical reactor is protected with an inert lead or glass lining.

• A. Nichrome
• B. Constantan
• C. Tungsten
• D. German silver

Explanation: Tungsten is used for bulb filaments because it has a very high melting point and can operate incandescently without rapidly vaporising.

• A. Plasticity
• B. Ductility
• C. Elasticity
• D. Creep

Explanation: Creep is the slow, progressive deformation of a material under a sustained load, especially at elevated temperature.

• A. Lead
• B. Copper
• C. Aluminium
• D. Wrought iron

Explanation: Lead has exceptionally high malleability, so it can be hammered or rolled into very thin sheets without cracking.

• A. Heat treatment of high speed steel
• B. Surface coating
• C. Cold working on metals
• D. None of these

Explanation: Sherardizing is a zinc-diffusion coating process in which steel articles are heated with zinc powder.

• A. Thermal & electrical insulator
• B. Conductor of heat
• C. Both B. & C.
• D. Conductor of electricity

Explanation: Graphite has delocalized electrons that allow it to conduct electricity, and its layered carbon structure also transfers heat effectively…

• A. Ferrous oxide
• B. Ferric sulphide
• C. Powdered iron
• D. Hydrated ferric oxide

Explanation: Ordinary iron rust is mainly hydrated ferric oxide, often represented approximately as Fe₂O₃·xH₂O.

• A. Hydrofluoric acid
• B. Dilute HNO3
• C. Dilute HCl
• D. Dilute H2SO4

Explanation: Hydrofluoric acid attacks glass by reacting with its silica, so glass-lined vessels are unsuitable for HF service.

• A. Elasticity
• B. Plasticity
• C. Ductility
• D. Malleability

Explanation: Plasticity is the ability to undergo permanent deformation without returning to the original shape after the load is removed.

• A. Tensile
• B. Compressive
• C. Fluctuating
• D. None of these

Explanation: Fatigue failure develops under repeated or fluctuating stress, often at stress levels below the material's static strength.

• A. Stainless steel
• B. Titanium
• C. Cast iron
• D. Hastelloy C

Explanation: Plate heat exchanger plates require thin, formable, corrosion-resistant materials such as stainless steel, titanium, or Hastelloy C.

• A. Lead lined steel
• B. Cast iron
• C. Aluminium
• D. Stainless steel

Explanation: Stainless steel is non-porous, corrosion-resistant and easy to clean, making it suitable for hygienic milk-processing equipment.

• A. All A., B. and C.
• B. Chloroform
• C. Sulphuric acid (95%)
• D. Aqua regia

Explanation: Rubber linings are attacked or swollen by strongly oxidising acids such as aqua regia, concentrated sulphuric acid and organic solvents…

• A. High carbon iron
• B. Malleable & ductile; and hence is used for chain links, hooks & couplings
• C. Highly resistance to acid corrosion
• D. An alloy of iron, chromium & carbon

Explanation: Wrought iron contains very little carbon, so it is soft, malleable and ductile rather than a high-carbon alloy.