Free Plant Design and Economics MCQs with Answers

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

Explanation: Hydrochloric acid readily attacks ordinary steel and many unprotected metals, so a steel vessel is protected with a chemically resistant…

• A. Glass
• B. Teflon
• C. Glass lined steel
• D. Bakelite

Explanation: The chlorinator handles highly corrosive chlorine and chlorinating mixtures, so glass-lined steel provides corrosion resistance together…

• A. Corrosion resistance
• B. Tensile strength
• C. Compressive strength
• D. Machinability

Explanation: Lead, sulphur and phosphorus form inclusions or compounds that make low-carbon steel easier to cut, drill and shape.

• A. Hardness increases
• B. All A., B. and C.
• C. Tensile strength increases
• D. Ductility reduces

Explanation: Increasing carbon generally raises steel hardness and tensile strength but reduces ductility.

• A. Medium carbon steel
• B. Cast iron
• C. High carbon steel
• D. Wrought iron

Explanation: Gray cast iron has relatively low tensile strength because its graphite flakes act as internal stress concentrators.

• A. Cold working
• B. Shot blasting
• C. Annealing
• D. Heating

Explanation: Annealing softens steel by heating it and then cooling it slowly, which relieves internal stresses and produces a more workable structure.

• A. Copper & zinc
• B. Zinc & tin
• C. Copper & nickel
• D. Copper & tin

Explanation: Bell metal is a copper-tin bronze, traditionally containing a relatively high proportion of tin to produce its hard, resonant character.

• A. Cubic
• B. Hexagonal
• C. Orthorhombic
• D. None of these

Explanation: Most common engineering metals crystallise in cubic structures, mainly body-centred cubic or face-centred cubic forms.

• A. High speed
• B. High carbon
• C. Chrome
• D. Silicon

Explanation: Ball bearings require high hardness, wear resistance and fatigue strength, supplied by high-carbon chromium steel.

• A. Cartridge brass
• B. Muntz brass
• C. Aluminium brass alloy
• D. Wood metal

Explanation: Condenser tubes commonly use corrosion-resistant copper alloys such as cartridge brass, Muntz brass and aluminium brass.

• A. Stainless steel-glass lined
• B. Brass
• C. Nickel
• D. Cast iron-rubber lined

Explanation: Tomato juice is acidic and can attack ordinary metals, while stainless steel provides hygienic corrosion resistance and glass lining gives…

• A. 0.015
• B. 0.055
• C. 0.505
• D. 0.805

Explanation: Sulphur is an undesirable impurity in steel because it promotes hot shortness, so its specification is kept near 0.05 percent.

• A. Lead lined vessels
• B. Solder alloys
• C. Electric cable sheathing
• D. Storage batteries

Explanation: The largest use of lead is in lead-acid storage batteries, where it forms the grids and active electrode materials.

• A. Both B. and C.
• B. Carbon impregnated with resin (usually Bakelite)
• C. An acid resistant material
• D. A mixture of iron dust and saw dust

Explanation: Karbate is a carbon or graphite material impregnated with a resin, commonly Bakelite, and is valued for acid resistance.

• A. Ultimate tensile strength (U.T.S.)
• B. Endurance limit
• C. Elastic limit
• D. None of these

Explanation: The endurance limit is the maximum repeated or alternating stress a material can withstand without fatigue failure, usually below its…

• A. Tensile strength
• B. Ductility
• C. Proximity between its elastic limit and ultimate breaking strength
• D. All A., B. and C.

Explanation: Cast iron is brittle, so its elastic limit lies relatively close to its ultimate breaking strength and it has little plastic deformation…

• A. Cubic
• B. Orthorhombic
• C. Hexagonal
• D. None of these

Explanation: Most commonly used metals crystallise in cubic forms, mainly body-centred cubic or face-centred cubic structures.

• A. Metallic carbides
• B. High alumina ceramic
• C. Corundum
• D. Carborundum

Explanation: Spark plugs use high-alumina ceramic as the electrical insulator because it withstands high temperature, thermal shock, and electrical…

• A. Cracks and blow holes are eliminated
• B. Ductility and impact strength improves
• C. Appreciable strain hardening is produced
• D. Yield stress, hardness and fatigue strength is not at all affected

Explanation: Cold working plastically deforms metal below its recrystallisation temperature, generating dislocations that cause appreciable strain…

• A. Both A. & B.
• B. Magnesium
• C. Copper
• D. Neither A. nor B.

Explanation: Duralumin is an aluminium-copper-magnesium alloy, and ageing increases its strength through precipitation of copper-rich and…