Free Plant Design and Economics MCQs with Answers
803 Plant Design and Economics MCQs from Chemical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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803 questions · page 15 of 41
- A. Injection moulded
- B. Extruded
- C. Cast molded
- D. None of these
Explanation: Thermosetting resins form a permanent cross-linked network during curing, so they are commonly shaped by casting, compression, or transfer…
Correct answer: Cast molded- A. Made lustrous by heating it
- B. Hammered to a thin sheet
- C. Fractured without deformation
- D. Drawn into wires
Explanation: Ductility is the ability to undergo substantial plastic deformation in tension, which allows a material to be drawn into wire.
Correct answer: Drawn into wires- A. Friable
- B. Ductile
- C. Brittle
- D. None of these
Explanation: A ductile material undergoes considerable permanent deformation under tensile loading before fracture.
Correct answer: Ductile- A. High co-efficient of thermal expansion
- B. Low thermal conductivity
- C. High corrosion resistance
- D. All A., B. and C.
Explanation: Brass is selected for these evaporator tubes mainly because it resists corrosion in the sugar and salt environments.
Correct answer: High corrosion resistance- A. Calcium
- B. Boron
- C. Silicon
- D. Aluminium
Explanation: Carborundum is the common name for silicon carbide, with the formula SiC.
Correct answer: Silicon- A. High silicon iron (14% Si)
- B. Tin
- C. Stainless steel
- D. All A., B. and C.
Explanation: Carbon tetrachloride is compatible with high-silicon iron, tin, and suitable stainless steel, all of which are used for…
Correct answer: All A., B. and C.- A. 0.5
- B. 2
- C. 40
- D. 75
Explanation: Steel has a Young’s modulus of about 200 GPa, which is approximately 2 × 10⁶ kg/cm².
Correct answer: 2- A. Armature of small motors/generators
- B. High frequency transformers
- C. Induction motors
- D. Generators and small motors
Explanation: High-silicon electrical steel, containing roughly 4% silicon, is used for high-frequency transformer cores because it has low hysteresis…
Correct answer: High frequency transformers- A. Hydrochloric acid (10%)
- B. Hydrochloric acid (95%)
- C. None of these
- D. Sulphuric acid
Explanation: PTFE is exceptionally resistant to both dilute and concentrated hydrochloric acid and to sulphuric acid under ordinary conditions.
Correct answer: None of these- A. Lead
- B. Alloy steel
- C. Rubber or ceramic material
- D. Cast iron
Explanation: Ball-mill liners are commonly made from cast iron, alloy steel, rubber, or ceramic materials selected for abrasion resistance.
Correct answer: Lead- A. Wrought iron
- B. Steel
- C. Cast iron
- D. None of these
Explanation: Steel commonly shows a granular or crystalline fracture, whereas wrought iron is characteristically fibrous.
Correct answer: Steel- A. Tantalum
- B. Aluminium
- C. Nickel or glass lined steel
- D. Lead
Explanation: PVC polymerisation can involve corrosive chloride-containing materials, so reactors are commonly glass-lined steel or nickel alloy to…
Correct answer: Nickel or glass lined steel- A. Corrosion resistance
- B. Cutting ability
- C. Elasticity & creep resistance
- D. Abrasion resistance & toughness
Explanation: Manganese increases hardenability and contributes to toughness and resistance to abrasion, making alloy steel more durable under impact…
Correct answer: Abrasion resistance & toughness- A. Formic acid
- B. Ammonia
- C. Ethyl alcohol
- D. Acetone
Explanation: Formic acid is sufficiently corrosive to attack ordinary mild steel, so it requires more resistant container materials.
Correct answer: Formic acid- A. Slip casting
- B. Welding
- C. Extrusion
- D. Plastic pressing
Explanation: Ceramics are shaped by processes such as slip casting, extrusion, and plastic pressing before firing, but conventional welding is not used…
Correct answer: Welding- A. Shear
- B. Compressive
- C. Tensile
- D. None of these
Explanation: Concrete is strong in compression but weak in tension, so steel rods are embedded mainly to carry tensile stresses and control cracking.
Correct answer: Tensile- A. Bauschinger effect
- B. Hooke's effect
- C. Hysteresis
- D. Relaxation
Explanation: The Bauschinger effect is the reduction in yield strength in compression after a material has been plastically strained in tension, and…
Correct answer: Bauschinger effect- A. Aluminium
- B. Stainless steel
- C. High silicon (14%) iron
- D. Copper
Explanation: The nitric-acid and ammonia neutralisation process is hot and chemically aggressive, so stainless steel is used for the neutraliser tank…
Correct answer: Stainless steel- A. Cans for food packing
- B. Collapsible tubes for toilet preparations
- C. All A., B. and C.
- D. Foil for wrapping cheese
Explanation: Tin is valued for its non-toxic, corrosion-resistant coating and its ability to form thin sheets, so it is associated with food cans…
Correct answer: All A., B. and C.- A. Has decreased plasticity at increasing temperature
- B. Cannot be moulded
- C. None of these
- D. Easily deform under pressure at high temperature
Explanation: Thermoplastics soften when heated and can be reshaped by pressure or moulding, then harden again on cooling.
Correct answer: Easily deform under pressure at high temperature