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 38 of 41
- A. Nickel
- B. Vanadium
- C. Molybdenum
- D. Chromium
Explanation: Nickel improves toughness, strength, and corrosion resistance with comparatively little loss of ductility.
Correct answer: Nickel- A. Oxy-acetylene flame
- B. Inert gas arc welding
- C. Arc welding
- D. Oxy-hydrogen flame
Explanation: Inert-gas arc welding, especially TIG or MIG variants, protects the molten stainless steel from atmospheric contamination and helps…
Correct answer: Inert gas arc welding- A. Polymer fibre in a glassy matrix
- B. Glass fibre in a metallic matrix
- C. Glass fibre in a polymer matrix
- D. Both 'b' & 'c'
Explanation: Fibreglass consists of strong glass fibres embedded in a polymer resin matrix, which binds the fibres and transfers stress.
Correct answer: Glass fibre in a polymer matrix- A. Brass
- B. Mild steel
- C. Lead
- D. Cast iron
Explanation: Cast iron contains substantial carbon and has a brittle structure, so it fractures rather than deforming plastically under an impact.
Correct answer: Cast iron- A. 400 - 700
- B. 60 - 100
- C. 1200 -1500
- D. 2000 - 2300
Explanation: An electric arc furnace commonly consumes roughly 400–700 kWh per tonne of steel, depending on scrap quality, furnace efficiency and…
Correct answer: 400 - 700- A. Thoria
- B. Glass
- C. Ice
- D. Pig iron
Explanation: Glass softens over a temperature range because it is an amorphous material and lacks a long-range crystal lattice.
Correct answer: Glass- A. Aluminising
- B. Chromising
- C. Tempering
- D. Alloying
Explanation: Tempering changes the hardness and toughness of a metal but is not a corrosion-prevention treatment.
Correct answer: Tempering- A. Is trebled
- B. Decreases by a factor of 1/3
- C. Decreases by a factor of 3
- D. Remains unchanged
Explanation: EOQ is proportional to the square root of demand multiplied by ordering cost: Q = √(2DS/H).
Correct answer: Remains unchanged- A. None of these
- B. Bearing
- C. Yield
- D. Working
Explanation: The factor of safety compares the maximum or ultimate stress a component can withstand with the allowable working stress: FOS = ultimate…
Correct answer: Working- A. Grain size
- B. Fatigue limit
- C. Surface hardness
- D. Wear resistance
Explanation: Nitriding introduces nitrogen into the surface and increases hardness, wear resistance and usually fatigue strength.
Correct answer: Grain size- A. Tempering
- B. Hardening
- C. Annealing
- D. Normalising
Explanation: Heating hypoeutectoid steel above its upper critical temperature, soaking it, and cooling it slowly produces ferrite and pearlite, which…
Correct answer: Annealing- A. 0.001
- B. 0.01
- C. 0.002
- D. 0.02
Explanation: One Rockwell hardness number represents a permanent indentation-depth change of 0.002 mm.
Correct answer: 0.002- A. Alloying elements content
- B. Carbon content
- C. Grain size
- D. Chemical composition
Explanation: Alloying elements such as chromium, molybdenum, manganese and nickel delay transformation during cooling and therefore increase…
Correct answer: Alloying elements content- A. Grease
- B. Solid lubricant
- C. Animal oils
- D. Mineral oils
Explanation: Solid lubricants such as graphite and molybdenum disulfide retain their lubricating action at temperatures where oils and greases may…
Correct answer: Solid lubricant- A. Copper
- B. Aluminium
- C. Brass
- D. Lead
Explanation: Brass has a strong tendency to harden during plastic deformation, so successive forming operations can rapidly increase its strength and…
Correct answer: Brass- A. Steel
- B. Glass
- C. Rubber
- D. Brass
Explanation: Elasticity here means resistance to deformation under a given load, so the material with the highest modulus of elasticity is considered…
Correct answer: Steel- A. Four
- B. Two
- C. Six
- D. Eight
Explanation: For a similar riveted joint, the usual Unwin relation gives rivet diameter d proportional to the square root of plate thickness t.
Correct answer: Two- A. Has higher current carrying capacity
- B. Is stronger than ordinary tungsten
- C. Has better electron emissivity
- D. Is easy to prepare
Explanation: Thorium oxide added to tungsten increases thermionic electron emission, allowing the electrode to emit electrons more readily and maintain…
Correct answer: Has better electron emissivity- A. Zirconia
- B. Alumina
- C. Bakelite
- D. Tungsten carbide
Explanation: A cermet combines a ceramic or carbide phase with a metallic binder; tungsten carbide tools commonly contain cobalt as the metallic phase.
Correct answer: Tungsten carbide- A. Liquidation of financial obligations on instalment basis
- B. Commitment of financial obligation on priority
- C. Liquidation of all the obsolete equipments of the company
- D. Modernisation of the plant equipments
Explanation: Amortization means paying off a financial obligation gradually through scheduled instalments.
Correct answer: Liquidation of financial obligations on instalment basis