All Free Chemical Engineering MCQs with Answers
Every Chemical Engineering question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
6,983 questions · page 309 of 350
- 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.
Correct answer: Plasticity- 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.
Correct answer: Fluctuating- 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.
Correct answer: Cast iron- 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.
Correct answer: Stainless steel- 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…
Correct answer: All A., B. and C.- 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.
Correct answer: Malleable & ductile; and hence is used for chain links, hooks & couplings- A. Above 1403
- B. Above 1800
- C. Upto 910
- D. Between 910 & 1403
Explanation: Alpha iron is the body-centred-cubic ferrite form of iron and remains stable from low temperature up to about 910°C, where it changes to…
Correct answer: Upto 910- A. None of these
- B. Gypsum
- C. Rubber
- D. Talc
Explanation: On the Mohs hardness scale, talc has the minimum hardness, assigned a value of 1.
Correct answer: Talc- A. High toughness
- B. High wear resistance
- C. Poor hardenability
- D. All A., B. & C.
Explanation: Cold-work tool steels must resist abrasion and deformation during cutting or forming, so high wear resistance is essential.
Correct answer: High wear resistance- A. And copper
- B. And graphite
- C. Tin, nickel, iron and chromium
- D. None of these
Explanation: Zircaloy is primarily zirconium alloyed with small amounts of tin, iron, nickel and chromium.
Correct answer: Tin, nickel, iron and chromium- A. High carbon steel
- B. Wrought iron
- C. Mild steel
- D. None of these
Explanation: An iron-carbon alloy containing about 4% carbon lies in the cast-iron range, whereas steel generally contains less than about 2.1% carbon.
Correct answer: None of these- A. Visual inspection by naked eye
- B. Optical microscope
- C. X-rays
- D. Metallurgical microscope
Explanation: Macrostructure concerns large-scale features such as cracks, segregation and weld defects, which can often be observed by visual…
Correct answer: Visual inspection by naked eye- A. Cast iron
- B. Either B. & C.
- C. Aluminium
- D. Steel
Explanation: Acetaldehyde can be transported in suitable steel or aluminium drums, provided the containers are properly designed for this volatile…
Correct answer: Either B. & C.- A. Cast iron
- B. High silicon iron (14% Si)
- C. Mild steel
- D. Tin lined with refractory bricks
Explanation: Rotary dryers are commonly fabricated from mild steel because it is strong, readily available, weldable, and economical.
Correct answer: Mild steel- A. Torsion
- B. Tensile
- C. Compressive
- D. Fluctuating
Explanation: Fatigue results from repeated or fluctuating stresses, even when each individual stress is below the material's ultimate strength.
Correct answer: Fluctuating- A. Phosphorus
- B. Silicon
- C. Sulphur
- D. None of these
Explanation: Silicon promotes the formation of a protective, relatively corrosion-resistant film in cast iron and also encourages graphitic carbon…
Correct answer: Silicon- A. Plain carbon steel
- B. Stainless steel
- C. Chrome carbon steel
- D. Malleable cast iron
Explanation: Ball bearings require high hardness, wear resistance, and fatigue strength, which are provided by high-carbon chromium steel, commonly…
Correct answer: Chrome carbon steel- A. Pumice stone
- B. Graphite
- C. Carborundum
- D. Diamond
Explanation: Diamond is the hardest naturally occurring material because its carbon atoms are held in a strong three-dimensional covalent lattice.
Correct answer: Diamond- A. Increases its melting point
- B. Does not affect its melting point
- C. Makes it malleable
- D. Decreases its melting point
Explanation: Most impurities disrupt the regular iron lattice and lower the melting temperature, so impure iron melts over a lower or broader…
Correct answer: Decreases its melting point- A. Are used for automobile parts like gears, axle, shaft, bearings etc.
- B. Are prone to temper brittleness
- C. Have very poor fatigue resistance
- D. Do not contain nickel or chromium or both
Explanation: Low-alloy molybdenum steels in this range are valued for strength, hardenability, and fatigue resistance, making them suitable for gears…
Correct answer: Are used for automobile parts like gears, axle, shaft, bearings etc.