MCQOPTIONS
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MCQOPTIONS
This section includes 908 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
*/*_Liquid redistribution should be done in a packed tower packed with raschig rings every 6 metres or __________ times the column diameter, whichever is lower.? |
| A. | 2.5-3.0 |
| B. | 5-7.5 |
| C. | 10-12.5 |
| D. | 15-20 |
| Answer» B. 5-7.5 | |
| 302. |
*/*___________ dished head is the strongest of all.? |
| A. | Hemispherical |
| B. | Elliptical |
| C. | Torispherical |
| D. | None of these |
| Answer» B. Elliptical | |
| 303. |
*/*_Pick out the wrong statement pertaining to the design of a long tube vertical evaporator.? |
| A. | Tube dia is 3-6 cms, while tube length in 3-6 metres |
| B. | Steam is fed to the shell, whereas the liquor is filled inside the tube |
| C. | Liquor level is maintained at l/3rd to 1/2 of the height of the tube |
| D. | None of these |
| Answer» E. | |
| 304. |
*/*_A shell may by termed as thin if its thickness to diameter ratio is less than 0.1. The factor which can be neglected in the calculation of membrane stresses is? |
| A. | Bending |
| B. | Deformation |
| C. | Shear |
| D. | Elongation |
| Answer» B. Deformation | |
| 305. |
*/*_The clearance between two tubes in a shell and tube heat exchanger is known as 'ligament', whose minimum value is __________ the outside diameter of the tube, but in no case it should be less than 4.5 mm.? |
| A. | Equal to |
| B. | Half |
| C. | One fourth |
| D. | Three fourth |
| Answer» D. Three fourth | |
| 306. |
*/*_Joint efficiency (J) for a seamless pipe is? |
| A. | 1 |
| B. | 0.85 |
| C. | 1.2 |
| D. | < 0.5 |
| Answer» B. 0.85 | |
| 307. |
*/*_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 |
| Answer» B. The tube bundle is suspended on bracket | |
| 308. |
*/*_Commercial packed scrubbers are normally designed for a pressure drop range of __________ mm water coloumn per metre of packed height.? |
| A. | 4-8 |
| B. | 17-34 |
| C. | 52-68 |
| D. | 88-105 |
| Answer» C. 52-68 | |
| 309. |
*/*_Speed of the drum of the rotary vacuum filter normally ranges from __________ rpm.? |
| A. | 0.1 to 2 |
| B. | 5 to 7 |
| C. | 3 to 8 |
| D. | 8 to 15 |
| Answer» B. 5 to 7 | |
| 310. |
*/*_Pick out the wrong statement pertaining to the design of a horizontal tube evaporator.? |
| A. | It is unsuitable for concentrating those liquids, which form a scale or deposit salt |
| B. | It is suitable for process, in which the final product is a liquor instead of solid |
| C. | Its usual dimensions are: tube dia = 2-3 cms; evaporator body dia = 1-4 metres and evaporator height = 2.5-4 metres |
| D. | Liquor flows inside the tube, while the steam is outside submerging the tube |
| Answer» E. | |
| 311. |
*/*_In a continuous distillation column, the optimum reflux ratio ranges from __________ times the minimum reflux ratio.? |
| A. | 1.1 to 1.5 |
| B. | 1.6 to 2 |
| C. | 2.2 to 2.6 |
| D. | 2.7 to 3 |
| Answer» B. 1.6 to 2 | |
| 312. |
*/*_Cooling water fouling factors vary in the range of 0.001 to 0.003? |
| A. | (BTU/hr.ft² . °F)⁻¹ |
| B. | (kcal/hr.m² .°C)⁻¹ |
| C. | (W/m².°K)⁻¹ |
| D. | (kcal/hr. m. °C)⁻¹ |
| Answer» B. (kcal/hr.m¬¨‚⧠.¬¨‚àûC)‚Äö√Ö¬™¬¨œÄ | |
| 313. |
*/*_Which of the following efficiencies can be greater than 100%?? |
| A. | Overall plate efficiency |
| B. | Murphree plate efficiency |
| C. | Point efficiency |
| D. | None of these |
| Answer» C. Point efficiency | |
| 314. |
*/*_The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is? |
| A. | < 30 |
| B. | < 7 |
| C. | > 7 < 15 |
| D. | > 20 < 50 |
| Answer» C. > 7 < 15 | |
| 315. |
*/*_Rotary driers are most economically designed for the number of heat transfer units (HTU) from? |
| A. | 0.01 to 1 |
| B. | 1.5 to 2.5 |
| C. | 5 to 10 |
| D. | 10 to 20 |
| Answer» C. 5 to 10 | |
| 316. |
*/*_In a multiple effect evaporator system having 'n' effects, the amount of water evaporated per unit surface area in approximately equal to __________ times that in a single effect.? |
| A. | nth |
| B. | (1/n)th |
| C. | 0.5 nth |
| D. | 1.5 nth |
| Answer» C. 0.5 nth | |
| 317. |
*/*_The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from? |
| A. | 2 to 3 |
| B. | 3 to 5 |
| C. | 4 to 8 |
| D. | 6 to 12 |
| Answer» D. 6 to 12 | |
| 318. |
*/*_In a shell and tube heat exchanger, the 'tube pitch' is defined as the? |
| A. | O.D. of the tube for square pitch |
| B. | Shortest distance between two adj acent tube holes |
| C. | Shortest centre to centre distance between adjacent tubes |
| D. | None of these |
| Answer» D. None of these | |
| 319. |
*/*_Needle valves are generally not used for? |
| A. | Very large diameter pipes |
| B. | High pressure throttling service |
| C. | Very accurate flow control |
| D. | Smaller sizes of pipe |
| Answer» B. High pressure throttling service | |
| 320. |
*/*___________ 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 | |
| 321. |
*/*_Tube height in a calendria type evaporator is normally less than __________ metres.? |
| A. | 1 |
| B. | 2 |
| C. | 3.5 |
| D. | 5.5 |
| Answer» C. 3.5 | |
| 322. |
*/*_The slope of the feed line in distillation opeartion 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) | |
| 323. |
*/*_Reflux ratio variation in a distillation column is between? |
| A. | Zero and infinity |
| B. | Zero and one |
| C. | Minimum and infinity |
| D. | None of these |
| Answer» D. None of these | |
| 324. |
*/*_Pick out the wrong statement? |
| A. | In a flanged and standard dished head, the crown radius is ≤ shell outside diameter |
| B. | In a flanged and shallow dished head, the crown radius is > shell outside diameter |
| C. | Flat head covers are most suitable for larger vessels operating at very high pressure |
| D. | Flanged only head is a type of flat head in which gradual change in the shape at the centre results in reduced local stresses |
| Answer» D. Flanged only head is a type of flat head in which gradual change in the shape at the centre results in reduced local stresses | |
| 325. |
*/*_Angled baffles are preferred in the agitation tank to control the swirling action; if the viscosity of the liquid to be mixed is about 200 poise. However, the baffle may be completely eliminated for mixing liquids having viscoisty above __________ poise.? |
| A. | 300 |
| B. | 600 |
| C. | 1000 |
| D. | 1500 |
| Answer» C. 1000 | |
| 326. |
*/*_Maximum allowable vapour velocity in a bubble cap tower is determined by the? |
| A. | Entrainment considerations |
| B. | Vapour density |
| C. | Diameter of the column |
| D. | None of these |
| Answer» B. Vapour density | |
| 327. |
%_Liquid/petroleum fuel storage tanks are built underground (as in case of petrol pumps), when the storage capacity is less than __________ kilolitres._% |
| A. | 20 |
| B. | 30 |
| C. | 45 |
| D. | 85 |
| Answer» D. 85 | |
| 328. |
%_Saddle supports are used for supporting __________ vessels._% |
| A. | Horizontal cylinderical |
| B. | Tall vertical |
| C. | Thick walled vertical |
| D. | Thick spherical |
| Answer» B. Tall vertical | |
| 329. |
%_What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers?_% |
| A. | 6.5 cms |
| B. | 6.5 mm |
| C. | Equal to tube I.D |
| D. | Equal to tube O.D |
| Answer» C. Equal to tube I.D | |
| 330. |
%_The longitudinal stress induced in a thin walled cylinderical vessel under internal pressure is_% |
| A. | pd/2t |
| B. | pd/4t |
| C. | pd/t |
| D. | pd/8t |
| Answer» C. pd/t | |
| 331. |
%_In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer co-efficient (hi) vanishes after a Reynold number of_% |
| A. | 1000 |
| B. | 3000 |
| C. | 5000 |
| D. | 10000 |
| Answer» E. | |
| 332. |
%_Slope of countercurrent flow rotary drier is in the range of __________ meter/metre._% |
| A. | 0 to 0.08 |
| B. | 0 to 0.8 |
| C. | 0 to 1.5 |
| D. | 0 to 2.2 |
| Answer» B. 0 to 0.8 | |
| 333. |
%_What is the slope of the operating line in the rectifying section of a distillation coloumn?_% |
| A. | 0 |
| B. | ‚à û |
| C. | > 1 |
| D. | <1 |
| Answer» E. | |
| 334. |
%_Excessive liquid gradient on a tray may result in the_% |
| A. | Maldistribution of gas |
| B. | Back trapping |
| C. | Gas blowing beneath cap skit |
| D. | All of the above |
| Answer» E. | |
| 335. |
%_Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is_% |
| A. | More |
| B. | Same |
| C. | Less |
| D. | Twice |
| Answer» D. Twice | |
| 336. |
%_In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area._% |
| A. | 0.5 to 1.5 |
| B. | 2.5 to 4.0 |
| C. | 5 to 10 |
| D. | 10 to 15 |
| Answer» C. 5 to 10 | |
| 337. |
%_Maximum allowable vapour velocity in a bubble cap tower is determined by the_% |
| A. | Entrainment considerations |
| B. | Vapour density |
| C. | Diameter of the column |
| D. | None of these |
| Answer» B. Vapour density | |
| 338. |
%_Angled baffles are preferred in the agitation tank to control the swirling action; if the viscosity of the liquid to be mixed is about 200 poise. However, the baffle may be completely eliminated for mixing liquids having viscoisty above __________ poise._% |
| A. | 300 |
| B. | 600 |
| C. | 1000 |
| D. | 1500 |
| Answer» C. 1000 | |
| 339. |
%_The slope of the feed line in distillation opeartion 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) | |
| 340. |
%_Reflux ratio variation in a distillation column is between_% |
| A. | Zero and infinity |
| B. | Zero and one |
| C. | Minimum and infinity |
| D. | None of these |
| Answer» D. None of these | |
| 341. |
%_Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent._% |
| A. | 5 |
| B. | 20 |
| C. | 35 |
| D. | 55 |
| Answer» C. 35 | |
| 342. |
%_Baffle width is normally taken as __________ times the tank diameter._% |
| A. | 0.1-0.12 |
| B. | 0.4-0.5 |
| C. | 0.45-0.6 |
| D. | 0.2-0.45 |
| Answer» B. 0.4-0.5 | |
| 343. |
%_In packed towers provided with saddle packing, liquid redistributors are positioned at every __________ times column diameter or 6 metres whichever is less._% |
| A. | 2-3 |
| B. | 5-8 |
| C. | 10-15 |
| D. | 20-25 |
| Answer» C. 10-15 | |
| 344. |
%_Movement of pipeline caused by thermal expansion is taken care by providing_% |
| A. | Expansion joint |
| B. | Changes in its direction |
| C. | Change in the shape of pipeline |
| D. | All of the above |
| Answer» E. | |
| 345. |
%_In case of plain carbon steel, butt welded joints are used for shell plate thickness ≤ __________ cms.._% |
| A. | 1.2 |
| B. | 0.5 |
| C. | 3.8 |
| D. | 6.8 |
| Answer» D. 6.8 | |
| 346. |
%_Pressure differential maintained across a continuous rotary vacuum filter is in the range of __________ mm Hg column._% |
| A. | 50 to 100 |
| B. | 100 to 150 |
| C. | 250 to 500 |
| D. | 600 to 700 |
| Answer» D. 600 to 700 | |
| 347. |
%_In a multipass shell and tube heat exchanger, the shell side cross flow area does not depend upon_% |
| A. | Baffle spacing |
| B. | Clearance |
| C. | Pitch |
| D. | None of these |
| Answer» E. | |
| 348. |
%_Normally, the ratio of the total riser area to the tower cross sectional area (for bubble cap towers of diameter more than 3 ft) is around_% |
| A. | 0.4-0.6 |
| B. | 0.35-0.75 |
| C. | 0.1-0.2 |
| D. | 0.55-0.85 |
| Answer» D. 0.55-0.85 | |
| 349. |
%_Which of the following packing materials provides for maximum mass transfer?_% |
| A. | Lessig rings |
| B. | Raschig rings |
| C. | Cross-partition rings |
| D. | All of the above |
| Answer» D. All of the above | |
| 350. |
%_The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called_% |
| A. | Downcomer liquid seal |
| B. | Static submergence |
| C. | Skirt clearance |
| D. | None of these |
| Answer» C. Skirt clearance | |