All Free Chemical Engineering MCQs with Answers

• A. Copper and tin
• B. Copper and nickel
• C. Lead and tin
• D. Molybdenum and nickel

Explanation: Hastelloy refers to corrosion-resistant nickel-based alloys, many grades of which contain substantial molybdenum along with nickel.

• A. 0.1-2
• B. 4-6
• C. 2-4
• D. 0.001-0.01

Explanation: Steel is an iron-carbon alloy containing roughly 0.1 to 2% carbon; above about 2% carbon, the alloy is generally classified as cast iron.

• A. Nickel
• B. Steel
• C. Cast iron
• D. Karbate

Explanation: Nickel has excellent resistance to concentrated caustic soda, including hot NaOH solutions, so it is suitable for the evaporator and…

• A. Pig iron
• B. Wrought iron
• C. None of these
• D. High carbon steel

Explanation: Iron containing up to about 2% carbon is normally called steel, but that option is missing.

• A. High alloy
• B. Medium carbon
• C. High carbon
• D. Low carbon

Explanation: Mild steel is low-carbon steel, usually containing about 0.05 to 0.25% carbon, which gives it good ductility and weldability.

• A. Toughness
• B. Resilience
• C. Malleability
• D. Ductility

Explanation: Toughness is the energy a material absorbs before fracturing, represented by the total area under its stress-strain curve.

• A. Plastics
• B. Non-crystalline organic polymer
• C. Non-crystalline solids
• D. Crystalline solid

Explanation: Time-dependent viscoelasticity is especially characteristic of non-crystalline organic polymers because their long molecular chains slowly…

• A. Cast
• B. Stainless
• C. Carbon chrome
• D. Free carbon

Explanation: Ball-bearing races and balls are commonly made from hard carbon-chromium steel, which provides high hardness, wear resistance, and fatigue…

• A. Neither A. nor B.
• B. Corrosive
• C. Both A. & B.
• D. Abrasive

Explanation: Erosion is mechanical removal or deterioration caused by the abrasive action of a moving fluid, often containing suspended solids.

• A. Ductility
• B. Hardness
• C. Malleability
• D. None of these

Explanation: Malleable cast iron is valued because heat treatment converts its brittle structure into one with substantially improved ductility.

• A. Zinc
• B. Lead
• C. Mercury
• D. Tin

Explanation: An amalgam is an alloy in which mercury is one of the constituents, such as dental or sodium amalgams.

• A. Ceramic fibre blanket
• B. Slag wool
• C. Vermiculite
• D. Glass wool and 85% magnesia

Explanation: 85% magnesia is a traditional, widely used insulation for steam pipes because it has low heat conductivity and remains effective at…

• A. Extrusion
• B. Cold working
• C. Forging
• D. Electroforming

Explanation: Seamless steel pipes are commonly produced by piercing and extrusion-type hot-working operations, making extrusion the best option listed.

• A. Acid resistant, brittle and very hard
• B. All A., B. and C.
• C. Prone to breakage due to thermal expansion because of its very high co-efficient of thermal
• D. expansion
• E. High silicon iron

Explanation: Duriron is a high-silicon cast iron that resists acids but is very hard and brittle.

• A. Cast iron
• B. Pig iron
• C. Babbitt metal
• D. Steel

Explanation: Babbitt metal is used for bearing linings because it is soft enough to embed small dirt particles and conform to the shaft, while…

• A. All A., B. & C.
• B. Its hard and machinable
• C. Its brittle and malleable
• D. Its casting unsound

Explanation: Excess sulphur in pig iron promotes brittleness and causes hot-shortness, so castings may crack or become unsound.

• A. All A., B. & C.
• B. Very brittle
• C. Very hard
• D. More durable

Explanation: White cast iron contains carbon mainly as cementite, giving it very high hardness and brittleness compared with graphite-containing grey…

• A. Half
• B. One third
• C. One fifth
• D. One twelfth

Explanation: Wood has a tensile strength that is commonly estimated at roughly one-fifth of steel, although the actual value varies greatly with…

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

Explanation: Vanadium has a very strong affinity for carbon and forms stable vanadium carbides in steel.

• A. None of these
• B. Chromium steel
• C. Molybdenum steel
• D. Silicon steel

Explanation: Silicon steel has low hysteresis and eddy-current losses, so it is used in transformer cores, motors, and generators.