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 325 of 350
- A. Modulus of rigidity
- B. Modulus of elasticity
- C. Bulk modulus
- D. None of these
Explanation: The ratio of normal or linear stress to the corresponding linear strain is Young’s modulus, also called the modulus of elasticity.
Correct answer: Modulus of elasticity- A. Inadequate equipment design
- B. Improper layout of the equipments
- C. Faulty operating procedures
- D. Failure of equipments
Explanation: Many chemical-plant accidents arise from faulty operating procedures, including incorrect start-up, shutdown, isolation, or emergency…
Correct answer: Faulty operating procedures- A. None of these
- B. Axis of the load
- C. Perpendicular to the axis of the load
- D. Least radius of gyration
Explanation: A compression member buckles about the weak axis, which has the least radius of gyration and therefore the smallest critical buckling…
Correct answer: Least radius of gyration- A. Diamond
- B. Chain
- C. Zig-zag
- D. None of these
Explanation: In diamond riveting, the rivet rows are arranged so that their number decreases from the inner region toward the outer region, giving a…
Correct answer: Diamond- A. Flat
- B. Conical
- C. Dome
- D. Umbrella
Explanation: A conical roof is the standard and most commonly used roof for cylindrical storage tanks because it is simple to fabricate, drains…
Correct answer: Conical- A. 2
- B. 5
- C. 10
- D. 15
Explanation: For tanks up to 15 m in diameter, the shell thickness is commonly kept at least 5 mm to prevent buckling or elastic instability, even when…
Correct answer: 56487. A 'rupture disc' is provided in chemical equipments as an accessory meant for ___________________?
- A. Avoiding vortex formation
- B. Creating turbulence
- C. Enhancing mixing rate
- D. Relieving excess pressure
Explanation: A rupture disc is a thin, non-reclosing pressure-relief device that bursts at a specified pressure to protect equipment from overpressure.
Correct answer: Relieving excess pressure- A. ζ/E
- B. ζ
- C. E
- D. E/ζ
Explanation: In the elastic range, strain equals stress divided by Young’s modulus, so the yield strain is ζ/E.
Correct answer: ζ/E6489. The necessary wall thickness for a metallic storage vessel is a function of the ___________________?
- A. Ultimate tensile strength (or yield point) of the material and operating temperature
- B. Operating pressure and welding/joint efficiency
- C. Diameter of the vessel
- D. All A., B. and C.
Explanation: Vessel thickness is set by the pressure-induced stress, vessel diameter, allowable material strength at operating temperature, and joint…
Correct answer: All A., B. and C.- A. Tall (say 30 metres), but is full of liquid
- B. Tall but empty
- C. None of these
- D. Short (< 2 m) and housed indoor
Explanation: A short vessel housed indoors is largely shielded from wind and has little exposed area, so wind loading may commonly be neglected.
Correct answer: Short (< 2 m) and housed indoor- A. Ultimate
- B. Breaking
- C. Yield point
- D. None of these
Explanation: The largest load carried during the test divided by the specimen’s original cross-sectional area is the ultimate stress.
Correct answer: Ultimate- A. 25
- B. 23
- C. 26
- D. 27
Explanation: The rivet hole is made slightly larger than the rivet shank to allow insertion and subsequent expansion during riveting.
Correct answer: 23- A. Working
- B. Allowable
- C. Damaging
- D. None of these
Explanation: The factor of safety compares the stress that would damage or fail the member with the lower stress permitted in design or service.
Correct answer: Damaging- A. Saddle
- B. Socket
- C. Nipple
- D. Ferrule
Explanation: A ferrule is a removable sleeve or fitting used to connect a tube to a tube sheet, allowing the tube connection to be serviced or…
Correct answer: Ferrule- A. pd/2t
- B. pd/4t
- C. pd/t
- D. pd/8t
Explanation: For a thin cylindrical vessel, the longitudinal stress is obtained by balancing pressure force on a longitudinal section with the wall…
Correct answer: pd/4t- A. Geometrical
- B. Kinematic
- C. All A., B. and C.
- D. Dynamic
Explanation: Similarity-based scale-up requires geometric similarity for shape, kinematic similarity for motion, and dynamic similarity for the ratios…
Correct answer: All A., B. and C.- A. 0.5
- B. 1.5
- C. 2.5
- D. 3.5
Explanation: Hydrostatic tests are commonly conducted at about 1.5 times the internal design pressure, providing a safety margin for leakage and…
Correct answer: 1.5- A. 16
- B. 19
- C. 28
- D. 38
Explanation: Tubes smaller than about 19 mm outside diameter are generally avoided for fouling fluids because deposits rapidly restrict their flow area…
Correct answer: 19- A. 1.2
- B. 0.5
- C. 3.8
- D. 6.8
Explanation: For plain carbon-steel shells, butt-welded construction is used for plate thicknesses up to about 3.8 cm, or 38 mm.
Correct answer: 3.8- A. Clearance between shell & baffles and between tube & baffles should be minimum to avoid
- B. by-passing of the fluid, but it should be enough to permit the removal of tube bundle
- C. Baffles are supported independently of the tubes by tie rods and positioned by spacers
- D. Bracket supports are used for horizontal shell, while saddle support is used for vertical shell
- E. number of tie rods is 4 with at least 10 mm diameter
- F. Tie rods are fixed at one end in the tube sheet by making blind holes and the minimum
Explanation: Horizontal shell-and-tube exchangers are normally supported on saddle supports, while vertical units use brackets, lugs, or skirt-type…
Correct answer: Bracket supports are used for horizontal shell, while saddle support is used for vertical shell