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 34 of 41
- A. Pewter
- B. Babbitt
- C. White
- D. Gun
Explanation: Babbitt is a soft, low-friction bearing alloy commonly used as a lining on stronger bearing shells.
Correct answer: Babbitt- A. Multiple straight line
- B. Sinking fund
- C. Diminishing balance
- D. Sum of the years digit
Explanation: Under the diminishing-balance method, depreciation is calculated on the machine’s reducing book value, so the annual charge falls over…
Correct answer: Diminishing balance- A. Butt
- B. None of these
- C. Welded
- D. Lap
Explanation: For traditional riveted boiler construction, circumferential seams are preferably made as lap joints because they carry the longitudinal…
Correct answer: Lap- A. Starting sheet has planer anisotropy due to its texture
- B. Sheet material has been given substantial spring back
- C. Surface finish of the sheet is poor
- D. Starting sheet has normal anisotropy due to its texture
Explanation: Earing is uneven cup height during deep drawing, caused by planar anisotropy in the sheet’s crystallographic texture.
Correct answer: Starting sheet has planer anisotropy due to its texture- A. Cyaniding
- B. Parkerizing
- C. Austempering
- D. Martempering
Explanation: Parkerizing is a phosphate-coating process used for corrosion resistance and paint adhesion, not a heat treatment.
Correct answer: Parkerizing- A. Cadmium
- B. Hafnium
- C. Cobalt
- D. Boron
Explanation: Control rods require strong neutron absorbers such as boron, cadmium or hafnium.
Correct answer: Cobalt- A. Brake linings
- B. Bearings
- C. Carbide tool tips
- D. All A, B and C
Explanation: Powder metallurgy is suitable for porous self-lubricating bearings, composite brake linings and hard carbide cutting-tool tips.
Correct answer: All A, B and C- A. Bolt
- B. Stud
- C. Set screw
- D. Split nut
Explanation: A stud is a rod threaded at both ends, with one end screwed into a component and the other secured by a nut.
Correct answer: Stud- A. Anodising
- B. Tempering
- C. Carburising
- D. Annealing
Explanation: Tempering follows hardening and reheats the steel to a controlled lower temperature, relieving internal stresses and improving toughness.
Correct answer: Tempering670. Electrochemical corrosion can occur, only if ________________ is present in contact with metal?
- A. Air
- B. Oxygen
- C. Liquid medium
- D. Gaseous medium
Explanation: Electrochemical corrosion requires an electrolyte so that ions can move between anodic and cathodic regions.
Correct answer: Liquid medium- A. S < 0.05% and P < 0.05%
- B. S < 0.05% and P < 1.5%
- C. S 1.5%
- D. S > 1.5% and P < 0.05%
Explanation: The acid Bessemer lining cannot effectively remove phosphorus, so the hot metal must contain very little phosphorus; sulfur must also be…
Correct answer: S < 0.05% and P < 0.05%- A. Both A. & B.
- B. Motion
- C. Time
- D. Neither A. nor B.
Explanation: Work study combines method or motion study with time study. Motion study improves the way work is performed, while time study determines…
Correct answer: Both A. & B.- A. Gold reserve
- B. Goods produced
- C. Earning of the citizens
- D. Taxes paid
Explanation: GNP measures the market value of final goods and services produced by a country's nationals, including their production abroad.
Correct answer: Goods produced- A. Stainless steel
- B. Reinforced cement concrete
- C. Asbestos cement
- D. Cast iron
Explanation: Cast iron is strong, durable, non-combustible, and resistant to the conditions normally found in sanitary drainage systems.
Correct answer: Cast iron- A. Drilling
- B. Cutting torch
- C. Punching
- D. None of these
Explanation: Drilling produces accurately sized, smooth holes without the local deformation and residual stresses often caused by punching.
Correct answer: Drilling- A. Lot size corresponding to break even analysis
- B. Optimum lot size
- C. Average level of inventory
- D. None of these
Explanation: EOQ is the order or lot size that minimizes the combined ordering and inventory holding costs.
Correct answer: Optimum lot size- A. Cooling of furnace exhaust gases
- B. Absorbing the pollutant gases from the furnace exhaust
- C. Venting off (after burning) the excess inflammable/toxic gases at high pressure
- D. None of these
Explanation: A flare tower safely burns excess inflammable or toxic gases before discharging the combustion products, preventing dangerous pressure…
Correct answer: Venting off (after burning) the excess inflammable/toxic gases at high pressure- A. Lancing
- B. Spinning
- C. Slugging
- D. Shot peening
Explanation: Shot peening bombards a metal surface with small hard shots, producing compressive residual stresses that resist crack initiation and…
Correct answer: Shot peening- A. Tungsten carbide
- B. Stainless steel
- C. High speed steel
- D. Superalloys
Explanation: Tungsten carbide has a very high elastic modulus, approximately 7 × 10^6 kg/cm², making it much stiffer than steels and superalloys.
Correct answer: Tungsten carbide- A. Elastic
- B. Ultimate
- C. Yielding
- D. Breaking
Explanation: At the yield point, a small increase in load produces a comparatively large extension, marking the beginning of significant plastic…
Correct answer: Yielding