All Free Chemical Engineering MCQs with Answers

• A. Central dished section and straight flange section
• B. Corner torus section and central dished section
• C. Central dished section and corner torus section
• D. Straight flange section and corner torus section

Explanation: The crown radius describes the central dished portion of the head, while the knuckle radius describes the corner torus that joins the dish…

• A. None of these
• B. Dikes
• C. Surge chamber
• D. Rupture diaphragm

Explanation: A rupture diaphragm or rupture disk placed with the relief valve provides a barrier against leakage of an extremely hazardous material…

• A. Nozzle or rim
• B. Flared out
• C. Fluid in
• D. Ring plate

Explanation: A nozzle or rim-type reinforcement transfers the load around an opening efficiently and restores vessel strength and rigidity with…

• A. Axial tensile stress in the pipe
• B. Circumferential pipe-wall tension
• C. Forces exerted by static and dynamic action at bends
• D. Temperature stresses

Explanation: Internal pressure produces hoop stress approximately twice the longitudinal stress in a thin cylindrical pipe, so circumferential wall…

• A. 10
• B. 20
• C. 30
• D. 5

Explanation: For equipment walls thicker than about 30 mm, the extra thickness generally provides sufficient margin, so a separate corrosion allowance…

• A. pD/4t
• B. pD/2t
• C. pD/3t
• D. pD/6t

Explanation: For a thin cylindrical vessel, pressure produces a longitudinal stress of pD/(4t), while the circumferential stress is twice as large…

• 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…

• 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…

• 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…

• 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…

• 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…

• 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.

• A. Red
• B. Brown
• C. Yellow
• D. Sea green

Explanation: Sea green is the conventional identification colour for fresh-water pipelines in chemical plants.

• 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.

• 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.

• 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.

• 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…

• 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.

• 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…

• 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.