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 27 of 41
- A. Gas density
- B. All A., B. & C.
- C. Fibre selection
- D. Gas viscosity
Explanation: Temperature changes gas density and viscosity, which affect filtration flow and pressure drop, and it also determines whether the filter…
Correct answer: All A., B. & C.- A. Vapour & liquid load both
- B. Running cost of cooling water for condenser
- C. Fixed charges initially
- D. Running cost of steam for reboiler
Explanation: Increasing reflux reduces the number of theoretical stages needed for a fixed separation, so the required column height and fixed cost…
Correct answer: Fixed charges initially523. In the design of a shell and tube heat exchanger, the corrosion allowance ____________________?
- A. All A., B. & C.
- B. For carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe
- C. conditions it is 3 mm
- D. For internal cover and tube sheet is provided on both the sides
- E. Need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc.
Explanation: The listed practices are standard corrosion-allowance rules: non-pressure attachments may be exempt, carbon-steel and cast-iron pressure…
Correct answer: All A., B. & C.- A. Linear
- B. Shear
- C. Volumetric
- D. None of these
Explanation: A strain rosette uses several gauges at different angles to resolve normal or linear strains and calculate principal strains and shear…
Correct answer: Linear- A. Cone
- B. Dome
- C. Umbrella
- D. Flat
Explanation: A conical roof is the most common roof arrangement for cylindrical storage tanks because it is simple to fabricate, drains rainwater…
Correct answer: Cone- A. Zig-zag
- B. Chain
- C. Diamond
- D. None of these
Explanation: In a chain-riveted joint, rivets in successive rows lie directly opposite one another, forming aligned chains.
Correct answer: Chain- A. Red
- B. Brown
- C. Yellow
- D. Sea green
Explanation: Sea green is the conventional identification colour for fresh-water pipelines in chemical plants.
Correct answer: Sea green- A. Ultimate stress to working stress
- B. Ultimate stress to breaking stress
- C. Working stress to ultimate stress
- D. None of these
Explanation: The factor of safety compares the maximum strength the material can withstand with the allowable working stress.
Correct answer: Ultimate stress to working stress- A. Mild steel
- B. Rimmed still
- C. Killed steel
- D. Semi-killed steel
Explanation: Rimmed steel contains more dissolved gases and has poorer uniformity and weldability than killed or semi-killed steel.
Correct answer: Rimmed still530. The stress developed in a material without any permanent set is called the____________________?
- A. Ultimate stress
- B. Yield stress
- C. Elastic limit
- D. Breaking stress
Explanation: The elastic limit is the greatest stress that can be removed without leaving permanent deformation.
Correct answer: Elastic limit531. Column support for the roof of cylindrical storage tank must be provided for___________________?
- A. Small diameter tanks
- B. All tanks irrespective of their heights and diameters
- C. Small diameter tall tanks
- D. Large diameter tanks
Explanation: Large-diameter tank roofs require internal columns because the roof plates and supporting structure cannot span the wide diameter…
Correct answer: Large diameter tanks- A. Smaller dia vessel
- B. Larger dia vessel
- C. Larger dia long vessel
- D. Strength of the vessel is same irrespective of the diameter
Explanation: For a cylindrical pressure vessel, hoop stress is proportional to the vessel diameter at a fixed wall thickness and pressure.
Correct answer: Smaller dia vessel- A. 1
- B. 5
- C. 15
- D. 25
Explanation: For a hazardous chemical with a TLV below 1000 ppm, a large separation zone is recommended because even relatively small releases can…
Correct answer: 25- A. 20
- B. 30
- C. 45
- D. 85
Explanation: At petrol stations, underground tanks are generally used for smaller storage capacities, conventionally below about 45 kilolitres.
Correct answer: 45- A. Thermal
- B. Tensile
- C. Compressive
- D. Shear
Explanation: When a bar is prevented from expanding or contracting freely, temperature change creates thermal stress.
Correct answer: Thermal- A. 0.85
- B. 1
- C. 1.5
- D. < 0.5
Explanation: A seamless pipe has no welded joint whose strength must be discounted, so its joint efficiency is taken as unity.
Correct answer: 1- A. More
- B. Same
- C. Less
- D. More or less depending upon the pressure & temperature inside the vessel and the nature of
- E. the fluid contained therein
Explanation: The cylindrical shell must withstand the liquid head and hoop stress over the vessel height, so it is normally thicker than the roof and…
Correct answer: Less- A. Thick spherical
- B. Tall vertical
- C. Thick walled vertical
- D. Horizontal cylindrical
Explanation: Saddle supports distribute the load of a horizontal cylindrical vessel along two supporting regions and reduce local shell stress.
Correct answer: Horizontal cylindrical- A. Gas flow rate
- B. Electrode area
- C. Both A. & B.
- D. Neither A. nor B.
Explanation: For an electrostatic precipitator, collection efficiency increases with collecting electrode area because more surface is available for…
Correct answer: Electrode area- A. If its diameter is more than 50 meters
- B. If its diameter is less than 15-20metres
- C. If the thickness of the roof is more than that of the cylindrical shell
- D. Irrespective of its diameter
Explanation: A self-supporting conical roof is practical for relatively small storage tanks, commonly when the diameter is below about 15 to 20 m.
Correct answer: If its diameter is less than 15-20metres