MCQOPTIONS
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MCQOPTIONS
This section includes 324 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Width and depth of grooves in the tube sheet holes normally are _______________ inch respectively? |
| A. | 1/8 and 1/64 |
| B. | 1/64 and 1/8 |
| C. | 1/2 and 8 |
| D. | 1/2 and 5 |
| Answer» B. 1/64 and 1/8 | |
| 2. |
Wind load consideration in the design of a support can be neglected, when the vessel is___________________? |
| A. | Tall (say 30 metres), but is full of liquid |
| B. | Tall but empty |
| C. | Short (< 2 m) and housed indoor |
| D. | None of these |
| Answer» D. None of these | |
| 3. |
With increase in gas flow rate to fabric surface area ratio (Nm3/hr/m2 fabric surface area), the size & the cost of a bag filter___________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain unaffected |
| D. | None of these |
| Answer» C. Remain unaffected | |
| 4. |
With increase in pressure drop (for a given particle size), the dust collection efficiency of a cyclone separator will________________? |
| A. | Increase |
| B. | Decrease |
| C. | Remain unaffected |
| D. | Increase or decrease depending on the nature of the dust |
| Answer» B. Decrease | |
| 5. |
With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, FT_________________? |
| A. | Decreases very rapidly |
| B. | Increases very rapidly |
| C. | Remains constant |
| D. | Increases linearly |
| Answer» B. Increases very rapidly | |
| 6. |
With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the ______________________ decreases? |
| A. | Fixed charges initially |
| B. | Running cost of cooling water for condenser |
| C. | Vapour & liquid load both |
| D. | Running cost of steam for reboiler |
| Answer» B. Running cost of cooling water for condenser | |
| 7. |
Which of the following is the best tube material from thermal conductivity point of view alone ? |
| A. | Aluminium |
| B. | Stainless steel |
| C. | Copper |
| D. | Carbon steel |
| Answer» D. Carbon steel | |
| 8. |
Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation ? |
| A. | Sorel-Lewis method |
| B. | McCabe-Thiele’s method |
| C. | Ponchon-Savarit method |
| D. | None of these |
| Answer» B. McCabe-Thiele’s method | |
| 9. |
When one of the fluids is highly corrosive and has fouling tendency, it should_____________________? |
| A. | Preferably flow inside the tube for its easier internal cleaning |
| B. | Preferably flow outside the tube |
| C. | Flow at a very slow velocity |
| D. | Flow outside the tube, when the flow is counter-current and inside the tube when the flow is co-current |
| Answer» B. Preferably flow outside the tube | |
| 10. |
What is the value of ‘q’ for saturated vapor feed to a distillation column? (where q = fraction of the feed stream that is liquid ? |
| A. | 0 |
| B. | 1 |
| C. | <0 |
| D. | > 1 |
| Answer» B. 1 | |
| 11. |
What is the slope of the operating line in the rectifying section of a distillation column ? |
| A. | 0 |
| B. | ∞ |
| C. | > 1 |
| D. | <1 |
| Answer» E. | |
| 12. |
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 |
| Answer» D. 0.95 | |
| 13. |
Weep holes provided in the plates of a distillation column ____________________? |
| A. | Facilitate draining out liquid from a tray when the unit is not in operation |
| B. | Are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid |
| C. | Must be large enough (usually 1/4″ to 5/8″ dia) to prevent plugging but should not deliver excessive amount of fluid during operation |
| D. | All A., B. and C. |
| Answer» E. | |
| 14. |
Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is ___________________? |
| A. | More |
| B. | Less |
| C. | Same |
| D. | Either A. or B.; depends upon the I.D. of the pipe |
| Answer» C. Same | |
| 15. |
Vertical vessels are not supported by____________________? |
| A. | Brackets |
| B. | Skirts |
| C. | Columns |
| D. | Saddles |
| Answer» E. | |
| 16. |
Vertical condenser is advantageous to the horizontal condenser from operation point of view, when________________? |
| A. | Hydrostatic head is required for refluxing the condensate |
| B. | Only the function of condensation is to be carried out |
| C. | Sub-cooling of condensate is desired |
| D. | Both the functions of condensation & sub cooling are carried out in a single unit |
| Answer» E. | |
| 17. |
Vapor velocity in a distillation column for non-foaming mixture is in the range of ______________ times the flooding velocity? |
| A. | 0.1 to 0.3 |
| B. | 0.6 to 0.7 |
| C. | 0.85 to 0.95 |
| D. | 1.5 to 2 |
| Answer» C. 0.85 to 0.95 | |
| 18. |
Value of Peclet number = ∞, is the representative of___________________? |
| A. | Laminar flow |
| B. | Complete back mixing |
| C. | Plug flow |
| D. | Eddy diffusivity = 0 |
| Answer» D. Eddy diffusivity = 0 | |
| 19. |
Value of Peclet number = 0, is the representative of ____________________? |
| A. | Laminar flow |
| B. | Complete back mixing |
| C. | Plug flow |
| D. | Eddy diffusivity = 0 |
| Answer» C. Plug flow | |
| 20. |
Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around _________________? |
| A. | 2.5″ |
| B. | 0.5″ |
| C. | 5″ |
| D. | 50% of the plate spacing |
| Answer» C. 5″ | |
| 21. |
Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally ____________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8″)? |
| A. | Half |
| B. | Three fourth |
| C. | Equal to |
| D. | 1.5 times |
| Answer» D. 1.5 times | |
| 22. |
Tube side pressure drop in a 1-2 heat exchanger (for turbulent flow of fluids through the tubes) is about __________ times, that in a 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flow rate ? |
| A. | 2 |
| B. | ½ |
| C. | 4 |
| D. | 8 |
| Answer» E. | |
| 23. |
Tube wall thickness depends on the corrosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than _____________ mm outside diameter is generally not recommended for fouling fluids ? |
| A. | 16 |
| B. | 19 |
| C. | 28 |
| D. | 38 |
| Answer» C. 28 | |
| 24. |
Tube side heat transfer co-efficient for turbulent flow of liquid through tubes is proportional to___________________? |
| A. | G0.2 |
| B. | G0.5 |
| C. | G0.8 |
| D. | G1.5 |
| Answer» D. G1.5 | |
| 25. |
Tube height in a calandria type evaporator is normally less than _______________ metres? |
| A. | 1 |
| B. | 2 |
| C. | 3.5 |
| D. | 5.5 |
| Answer» C. 3.5 | |
| 26. |
Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger________________? |
| A. | Permits the use of less tubes in a given shell diameter |
| B. | Facilitates comparatively easier external cleaning because of large clearance |
| C. | Permits the use of more tubes in a given shell diameter |
| D. | Both B. and C. |
| Answer» D. Both B. and C. | |
| 27. |
_____________________ tray arrangement is recommended for distillation column having diameter upto 4 ft ? |
| A. | Radial flow |
| B. | Cross flow |
| C. | Split flow |
| D. | Cascade |
| Answer» C. Split flow | |
| 28. |
___________ tower is the most suitable gas-liquid contacting device involving highly corrosive fluids? |
| A. | Sieve plate |
| B. | Packed |
| C. | Bubble cap plate |
| D. | None of these |
| Answer» C. Bubble cap plate | |
| 29. |
To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of_________________? |
| A. | (1.2)3/2 |
| B. | (1.2)3/5 |
| C. | (1.2)2/3 |
| D. | (1.2)5/3 |
| Answer» E. | |
| 30. |
To avoid the tearing off the plate of an edge, the margin (i.e., the minimum distance from the centre of the rivet hole to the nearest edge of the plate) should be equal to ____________________? |
| A. | 0.5 d |
| B. | d |
| C. | 1.5 d |
| D. | 2.5 d |
| Answer» D. 2.5 d | |
| 31. |
Thickness of the frame of a plate and frame filter as compared to that of plates is___________________? |
| A. | Less |
| B. | Same |
| C. | More |
| D. | Either A. or B. |
| Answer» D. Either A. or B. | |
| 32. |
Thin spherical shells subjected to internal pressure, develop ______________ stresses? |
| A. | Radial |
| B. | Circumferential |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» B. Circumferential | |
| 33. |
Theoretically calculated diameter of the stripping section of the continuous rectification column is ______________ that of the enriching section? |
| A. | Less than |
| B. | More than |
| C. | Same as |
| D. | Either more or less (depending upon relative volatility |
| Answer» C. Same as | |
| 34. |
The wall thickness of thin cylindrical shell with hemispherical ends is ______________ that of the spherical ends? |
| A. | Equal to |
| B. | More than |
| C. | Less than |
| D. | Either B. or C.; depends on maximum permissible internal pressure |
| Answer» C. Less than | |
| 35. |
The wall thickness for a large high pressure pipeline is determined by the consideration of the____________________? |
| A. | Axial tensile stress in the pipe |
| B. | Forces exerted by static and dynamic action at bends |
| C. | Circumferential pipe-wall tension |
| D. | Temperature stresses |
| Answer» D. Temperature stresses | |
| 36. |
The value of fouling factor depends upon the__________________? |
| A. | Characteristic of process fluid |
| B. | Velocity of process fluid containing suspended solids |
| C. | Suspended solids in the fluid |
| D. | All A., B. and C. |
| Answer» E. | |
| 37. |
The units of Young’s modulus of elasticity and ________________ are the same? |
| A. | Strain |
| B. | Stress |
| C. | Modular ratio |
| D. | None of these |
| Answer» C. Modular ratio | |
| 38. |
The type of stress developed in a metallic bar on subjecting it to a change in temperature without allowing it to be deformed is ______________ stress? |
| A. | Shear |
| B. | Tensile |
| C. | Compressive |
| D. | Thermal |
| Answer» E. | |
| 39. |
The thickness of segmental baffles (25 -35% cut truncated plates usually) is generally _____________ the tube wall thickness? |
| A. | Equal to |
| B. | Twice |
| C. | Four times |
| D. | Half |
| Answer» C. Four times | |
| 40. |
The thickness of heat transfer plates used in the plate type heat exchanger ranges from _____________ mm, pressed in a single piece provided with grooves & corrugations? |
| A. | 0.3 to 0.8 |
| B. | 1.25 to 3.125 |
| C. | 3.5 to 7.0 |
| D. | 8 to12 |
| Answer» C. 3.5 to 7.0 | |
| 41. |
The thermal stress in a metallic bar does not depend upon the_____________________? |
| A. | Changes in temperature |
| B. | Cross-sectional area |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» C. Both A. and B. | |
| 42. |
The testing pressure of storage tanks and pressure vessels designed as per Indian standard codes should be about ______________ times the design pressure? |
| A. | 1.5 to 2 |
| B. | 3 to 4 |
| C. | 4 to 5 |
| D. | > 5 |
| Answer» B. 3 to 4 | |
| 43. |
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 |
| Answer» D. Breaking stress | |
| 44. |
The slope of operating line in the rectifying section of a distillation column is unity, if the reflux ratio is___________________? |
| A. | 0 |
| B. | ∞ |
| C. | 1 |
| D. | Minimum |
| Answer» C. 1 | |
| 45. |
The slope of the feed line in distillation operation is given by (where, q = fraction of the feed stream that is liquid ? |
| A. | -q |
| B. | -q/(1-q) |
| C. | -q/(q-1) |
| D. | None of these |
| Answer» C. -q/(q-1) | |
| 46. |
The shell side pressure drop in a shell and tube heat exchanger is maximum for _______________ baffle? |
| A. | Disk and ring |
| B. | Segmental |
| C. | Orifice |
| D. | Independent of the type of |
| Answer» D. Independent of the type of | |
| 47. |
The safe height (h) to diameter D. ratio (i.e., h/d) for liquid/petro fuel storage tank of capacity more than 45 kilolitres is less than _________________? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 3.5 |
| Answer» B. 2 | |
| 48. |
The safe distance of habitation from a hazardous chemical plant (TLV of its product < 1000 ppm) should be about ______________ kms? |
| A. | 1 |
| B. | 5 |
| C. | 15 |
| D. | 25 |
| Answer» E. | |
| 49. |
The retention time of material in a rotary dryer depends upon its ______________________? |
| A. | rpm |
| B. | Slope & length |
| C. | Flights arrangement |
| D. | All A., B. and C. |
| Answer» E. | |
| 50. |
The ratio, (propeller agitator dia/tank dia) is normally taken as____________________? |
| A. | 0.15-0.30 |
| B. | 0.5-0.65 |
| C. | 0.75-0.85 |
| D. | 0.60-0.90 |
| Answer» B. 0.5-0.65 | |