Free Plant Design and Economics MCQs with Answers

• A. Tin base alloy
• B. Pure metal
• C. Lead base alloy
• D. White metal

Explanation: Babbitt is a soft antifriction alloy, usually based on tin or lead, and is also called white metal. It is therefore not a pure metal.

• A. Silver nitrate
• B. Calcium silicate
• C. Silver halide
• D. Metallic silver

Explanation: Photographic plates use a light-sensitive coating of silver halide, commonly silver bromide dispersed in gelatin.

• A. Ductility
• B. Malleability
• C. Electrical conductivity
• D. Tenacity & hardness

Explanation: A small arsenic addition strengthens copper by increasing its hardness and tensile strength, described here as greater tenacity.

• A. Steel
• B. Cast iron
• C. Copper
• D. Monel metal

Explanation: Acetylene gas holders are normally fabricated from steel because steel provides the required strength and is practical for large welded…

• A. Short of antifrictional properties
• B. Tin or lead based alloys
• C. Having homogenous microstructure
• D. Yellow metals

Explanation: Babbitt bearing metals are soft tin-based or lead-based alloys designed to provide antifriction properties and embed small contaminant…

• A. Wrought iron
• B. Mild steel
• C. Pig iron
• D. High silicon (14%) iron

Explanation: Pig iron and cast iron both contain a high carbon percentage, generally around 2 to 4% or more, unlike steel, which contains less than…

• A. Hastelloy C
• B. Monel
• C. Inconel
• D. Bronzes

Explanation: Hastelloy C is a nickel-based corrosion-resistant alloy containing substantial molybdenum, with typical compositions close to 56% nickel…

• A. Tin and wood
• B. High silicon iron, Kel-F and Teflon
• C. Silicone rubber
• D. Stainless steel

Explanation: Concentrated nitric acid at high temperature is strongly oxidising, so high-silicon iron and fluoropolymers such as Kel-F and Teflon are…

• A. Tungsten steel
• B. Molybdenum steel
• C. Nickel-chrome steel
• D. Cobalt steel

Explanation: Nickel-chrome steel combines high strength, toughness and hardenability, making it suitable for gun barrels and projectiles.

• A. Ferromagnetic above its curie point (i.e., 415°C)
• B. Having h.c.p. crystal lattice
• C. Not resistant to oxidation at high temperature
• D. Ferromagnetic at room temperature

Explanation: Nickel is ferromagnetic at room temperature and loses ferromagnetism above its Curie temperature of approximately 358°C, not 415°C.

• A. None of these
• B. Copper, tin and zinc
• C. Copper and lead
• D. Lead, tin and cadmium

Explanation: White metal is a broad term for bearing alloys, commonly based on lead or tin with additions such as antimony, copper or other elements.

• A. Silver
• B. Copper
• C. Zinc
• D. Nickel

Explanation: German silver is a copper-nickel-zinc alloy and contains no actual silver.

• A. Cutting tools
• B. Both A. & B.
• C. Abrasives
• D. Neither A. nor B

Explanation: Cermets combine ceramic hardness and heat resistance with metallic toughness, so they are used in cutting tools and certain abrasive or…

• A. Vanadium
• B. Nickel
• C. Chromium
• D. Niobium

Explanation: Niobium stabilizes stainless steel by forming stable niobium carbides, preventing chromium carbide formation at grain boundaries and…

• A. High carbon steel
• B. Dead mild steel
• C. Medium carbon steel
• D. Mild steel

Explanation: Hammers and railway rails require high hardness and wear resistance, obtained from high-carbon steel.

• A. Erosion
• B. Creep
• C. Resilience
• D. None of these

Explanation: Creep is the gradual, time-dependent deformation that occurs when a material remains under constant stress, especially at elevated…

• A. Is very costly
• B. Corrodes easily
• C. Is having low creep strength
• D. None of these

Explanation: Lead has poor mechanical strength and low creep resistance, so it can deform slowly under sustained load.

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

Explanation: The hydration mixture contains sulphuric acid and mercuric sulphate, so the tower needs strong corrosion protection.

• A. Annealing
• B. Hardening
• C. Normalising
• D. Shot peening

Explanation: Cold working increases hardness and residual stresses while reducing ductility, so annealing is used to soften the steel and restore…

• A. Stainless steel-lead lined
• B. Carbon steel-brick lined
• C. Cast iron
• D. High carbon steel-porcelain lined

Explanation: A water-gas generator operates at high temperature, so its shell is made from carbon steel for strength and lined with refractory brick…