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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

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Chemical Engineering MCQs designed for job test and interview preparation, particularly for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover important topics such as the fundamentals of chemical engineering, chemical processes, chemical reactions, process control, and instrumentation, along with other key concepts in the field.

All Topics  9594

Pick out the wrong statement?
A Riveting provides a permanent fastening method
B The joint made by overlapping of one plate over the other, and then riveting the two plates together with two rows of rivets is called ‘double riveted butt joint’
C Shank diameter of the rivets should be less than the size of the hole drilled in the plate for riveting
D The efficiency of a riveted joint is the ratio of the strength of the riveted joint to the strength of the solid plate
Correct Answer: The joint made by overlapping of one plate over the other, and then riveting the two plates together with two rows of rivets is called ‘double riveted butt joint’
Pick out the wrong statement?
A The tensile strength of a brittle material is less than its compressive strength
B The compressive strength of a ductile material is less than its tensile strength
C In a thick cylindrical shell, the hoop stress is maximum at the inner radius
D The value of crushing load is more than that of buckling load for long columns
Correct Answer: The value of crushing load is more than that of buckling load for long columns
Pick out the correct statement?
A It is preferred to use a vertical condenser for condensation of vapor from a distillation column without sub-cooling
B Draining of residual liquid on tray during shut down of distillation column is facilitated by weep holes
C Random packing a packed tower offers the advantage of lower pressure drop and higher throughput of fluids as compared to regular/stacked packing
D Risers are generally not connected to the plate in a distillation coloumn by bolts, rivets or welding
Correct Answer: Risers are generally not connected to the plate in a distillation coloumn by bolts, rivets or welding
Pick out the wrong statement pertaining to the design of a basket type evaporator ?
A It is used for high viscosity liquor having large rate of scaling
B The tube bundle is suspended on bracket
C There is no central downtake
D Downtake is formed by the annular space between the bundle and the shell
Correct Answer: It is used for high viscosity liquor having large rate of scaling
Pick out the wrong statement pertaining to a shell and tube heat exchanger ?
A The minimum value of baffle spacing is 50 mm
B The maximum value of baffle spacing is equal to the I.D. of the shell
C The maximum unsupported tube span is generally about 75 times tube diameter, but is reduced to about 60 times for aluminium, copper & alloys of these
D Disk and doughnut baffle is the most commonly used baffle
Correct Answer: Disk and doughnut baffle is the most commonly used baffle
Pick out the wrong statement. In an agitated vertical cylindrical reaction vessel, the___________________?
A Ratio of liquid depth to tank diameter (i.e. the filling ratio) recommended for most purposes is 1
B Filling ratio for dispersing gas in a liquid is 2 for sufficiently long contact period
C Flat bottom and conical bottom vessels have low agitation efficiency for agitation of heavy solids in liquids
D Dished bottom vessel has very high power consumption
Correct Answer: Dished bottom vessel has very high power consumption
Pick out the correct statement ?
A When highly corrosive fluids are to be handled, the plate towers prove to be cheaper and easier to construct than packed tower
B Packed towers are generally preferred over plate towers, if the liquids have a foaming tendency
C The pressure drop through the packed towers is generally more than the pressure drop through plate towers designed for same duty
D None of these
Correct Answer: Packed towers are generally preferred over plate towers, if the liquids have a foaming tendency
Pick out the wrong statement ?
A For all the cylindrical process vessels operating above atmospheric pressure, formed heads are used for closing the vessel
B Fouling factor of river water is less than that of sea water
C Risers provided in bubble cap trays in the distillation column facilitate the flow of both liquid and vapor
D Both B. and C.
Correct Answer: Both B. and C.
Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column ?
A Bubble cap trays though most expensive are the best in situations, where low vapour rates is to be handled and a positive liquid seal is essential at all flow rates
B Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for sieve and valve trays than the bubble cap
C Maintenance cost for valve and sieve trays are comparatively more than bubble cap tray due to their relatively complicated construction features
D Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provide the maximum flexible operating range
Correct Answer: Maintenance cost for valve and sieve trays are comparatively more than bubble cap tray due to their relatively complicated construction features
Pick out the wrong statement about the design of a sieve plate column ?
A An increased weir height improves the tray efficiency at the cost of high plate pressure drop; optimum wear height being 40-90 mm for column pressure above atmospheric and 6-12 mm for vacuum columns
B For segmental downcomers, the chord length is 60-80% of the column diameter. An initial value of downcomer area of 12% is taken in the design
C Width of the calming section provided at the inlet and outlet sides of the plate is 75 mm for column diameter below 1.5 metres and 100 mm for larger diameter columns
D Minimum recommended downcomer residence time for the disengagement of entrained vapour is the same for both foaming and non-foaming liquids, which is about 20 seconds
Correct Answer: Minimum recommended downcomer residence time for the disengagement of entrained vapour is the same for both foaming and non-foaming liquids, which is about 20 seconds
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