All Free Chemical Engineering MCQs with Answers
Every Chemical Engineering question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
6,983 questions · page 322 of 350
- A. Bending
- B. Deformation
- C. Shear
- D. Elongation
Explanation: Thin-shell analysis assumes the load is carried mainly by membrane stresses distributed through the wall.
Correct answer: Bending- A. Equal to
- B. More than
- C. Less than
- D. Either B. or C.; depends on maximum permissible internal pressure
Explanation: For the same diameter, pressure and allowable stress, a cylindrical shell needs t = pD/(2σ), whereas a spherical shell needs t = pD/(4σ).
Correct answer: More than- A. Only if the opening is on spherical vessel
- B. Only if the opening is on a vertical cylindrical vessel
- C. Irrespective of the shape of the vessel
- D. Only if the opening is on a horizontal cylindrical vessel
Explanation: Under the area-compensation rule, the reinforcement pad replaces the material removed by the opening, provided it has suitable material…
Correct answer: Irrespective of the shape of the vessel- A. Pitch
- B. None of these
- C. Back pitch
- D. Margin
Explanation: The edge distance measured from a rivet-hole centre to the nearest plate edge is called the margin.
Correct answer: Margin- A. 1.5 d
- B. d
- C. 0.5 d
- D. 2.5 d
Explanation: A margin of about 1.5d provides enough plate width outside the rivet hole to prevent the edge from tearing away, where d is the rivet…
Correct answer: 1.5 d6426. Movement of pipeline caused by thermal expansion is taken care by providing ___________________?
- A. Expansion joint
- B. Changes in its direction
- C. All A., B. and C.
- D. Change in the shape of pipeline
Explanation: Thermal expansion can be absorbed by expansion joints, bends or direction changes, and deliberately flexible pipeline shapes such as…
Correct answer: All A., B. and C.- A. None of these
- B. Reduction of discontinuity in shape at the junction
- C. Making the joint leak proof
- D. Preventing the local overstressing of the shell around the opening
Explanation: A large opening weakens the shell and creates concentrated stresses around its edge, so reinforcement is added to prevent local…
Correct answer: Preventing the local overstressing of the shell around the opening- A. All A, B. & C.
- B. Outside diameter
- C. Height
- D. Shape
Explanation: Wind force on a tall vessel is governed by its projected area, which depends on height and outside diameter, and by the shape-dependent…
Correct answer: All A, B. & C.- A. 1
- B. 2
- C. 3
- D. 3.5
Explanation: For liquid or petroleum-fuel storage tanks above 45 kL capacity, the recommended safe proportion is a height-to-diameter ratio below 1.
Correct answer: 1- A. Conical
- B. Flat
- C. Floating
- D. Fixed
Explanation: Floating roofs are used for volatile liquids such as naphtha because they move with the liquid level and greatly reduce the vapour space…
Correct answer: Floating6431. Safety valves are provided in chemical equipments to guard against excessive_________________?
- A. Temperature
- B. Noise
- C. Turbulence
- D. Pressure/pressure fluctuation
Explanation: A safety valve opens automatically when equipment pressure exceeds its set limit, preventing rupture or dangerous overpressure.
Correct answer: Pressure/pressure fluctuation6432. Welded joint efficiency in the design of chemical process equipment is taken as_________________?
- A. 0.55
- B. 0.75
- C. 0.85
- D. 0.95
Explanation: A joint efficiency of 0.85 is the conventional design value used when full weld quality or radiographic credit is not assumed.
Correct answer: 0.85- A. Very accurate flow control
- B. High pressure throttling service
- C. Very large diameter pipes
- D. Smaller sizes of pipe
Explanation: Needle valves provide precise throttling through a small tapered opening, but their fine construction is impractical and expensive for…
Correct answer: Very large diameter pipes- A. No relation exists
- B. ζh = ζL
- C. ζh = ζL/2
- D. ζh = 2 ζL
Explanation: For a thin-walled cylindrical vessel, force balance on a longitudinal section gives hoop stress equal to twice the longitudinal stress.
Correct answer: ζh = 2 ζL- A. Head diameter
- B. None of these
- C. Overall length
- D. Shank diameter
Explanation: Rivets are conventionally identified by the nominal diameter of their shank, along with their length and head type when full specification…
Correct answer: Shank diameter- A. 1 to 1.5
- B. 2.5 to 3.5
- C. 4 to 5
- D. 6 to 8
Explanation: Tank spacing is commonly expressed relative to tank diameter, and a minimum separation of about one to one and a half diameters is used…
Correct answer: 1 to 1.5- A. pd/4t
- B. pd/2t
- C. pd/t
- D. pd/3t
Explanation: Balancing the internal pressure force with the resisting force in the two longitudinal walls gives the hoop stress, σh = pd/2t.
Correct answer: pd/2t- A. Radial
- B. Compressive
- C. Circumferential tensile
- D. Longitudinal
Explanation: Hoop stress acts tangentially around the circumference of the shell, so it is a circumferential tensile stress.
Correct answer: Circumferential tensile- A. Screwing
- B. Welding
- C. Brazing
- D. All A., B. and C.
Explanation: Pipe flanges may be attached using threaded connections, welding, or brazing, depending on pressure, temperature, material, and flange…
Correct answer: All A., B. and C.- A. Lug
- B. Saddle
- C. Skirt
- D. Guy wire
Explanation: Horizontal cylindrical pressure vessels are commonly supported on saddles, which distribute the vessel load over broad contact areas.
Correct answer: Saddle