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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 5201. |
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 | |
| 5202. |
The normal range of velocity of steam in pipes is __________ m/sec. |
| A. | 0.1-0.5 |
| B. | 1-5 |
| C. | 10-20 |
| D. | 80-100 |
| Answer» E. | |
| 5203. |
__________ dished head is the strongest of all. |
| A. | Hemispherical |
| B. | Elliptical |
| C. | Torispherical |
| D. | none of these |
| Answer» B. Elliptical | |
| 5204. |
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. | |
| 5205. |
In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower. |
| A. | molal flow rate of vapour |
| B. | vapour molecular weight |
| C. | pressure and temperature |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 5206. |
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 | |
| 5207. |
In case of design of a shell and tube heat exchanger, |
| A. | minimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch. |
| B. | minimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto 15 mm tube diameter; and for > 15 mm tube diameter, tube sheet thickness is smaller than tube diameter. |
| C. | O.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 5208. |
Nominal size of a pipe is an indication of its __________ diameter. |
| A. | inner |
| B. | outer |
| C. | approximate |
| D. | none of these |
| Answer» D. none of these | |
| 5209. |
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 (a), (b) and (c). |
| Answer» E. | |
| 5210. |
In the allocated cap area, bubble caps are generally arranged on equilateral triangular pitch. Number of caps fixed on a plate is with a |
| A. | clearance of 25-75 mm. |
| B. | cap pitch of 1.3-2 times the cap diameter. |
| C. | either 'a' or 'b'. |
| D. | neither 'a' nor 'b'. |
| Answer» D. neither 'a' nor 'b'. | |
| 5211. |
The length of straight rectangular weir used on cross-flow trays is generally __________ the column diameter. |
| A. | 0.6-0.8 times |
| B. | equal to |
| C. | twice |
| D. | 2 ft irrespective of (for column > 3 ft diameter) |
| Answer» B. equal to | |
| 5212. |
for couplings and unions would be |
| A. | 60 |
| B. | 200 |
| C. | 350 |
| D. | negligible |
| Answer» E. | |
| 5213. |
Stage efficiency for packed tower varies with the |
| A. | type & size of packing. |
| B. | fluid rates and fluid properties. |
| C. | operating pressure and column diameter. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 5214. |
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. | |
| 5215. |
Poisson's ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson's ratio for structural and pressure vessel steel may be taken as |
| A. | 0.01 |
| B. | 0.3 |
| C. | 0.75 |
| D. | 0.95 |
| Answer» C. 0.75 | |
| 5216. |
Removable connection of tubes to tube sheet is called |
| A. | ferrule |
| B. | socket |
| C. | nipple |
| D. | saddle |
| Answer» B. socket | |
| 5217. |
Maximum plate efficiency is achieved in case of __________ flow. |
| A. | split |
| B. | cross |
| C. | cascade |
| D. | reverse |
| Answer» C. cascade | |
| 5218. |
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 | |
| 5219. |
The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is |
| A. | 0.25 |
| B. | 0.50 |
| C. | 0.75 |
| D. | 1.25 |
| Answer» B. 0.50 | |
| 5220. |
Normally, the length to diameter ratio of rotary dryers varies form 4 to 10 and for its economic operation, the number of transfer units (NTU) for such dryers varies from |
| A. | 1.5-2.5 |
| B. | 3.5-5.5 |
| C. | 7.5-10.0 |
| D. | 10-15 |
| Answer» B. 3.5-5.5 | |
| 5221. |
The average velocity in the tubes of a 1-4 heat exchanger is __________ times that in 1-1 heat exchanger having the same size & number of tubes and operated at same liquid flow rate. |
| A. | 2 |
| B. | 1/2 |
| C. | 4 |
| D. | 1/4 |
| Answer» D. 1/4 | |
| 5222. |
Hoop (circumferential) stress induced in a thin walled 'Horton Sphere' used for the storage of liquid ammonia under pressure is |
| A. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/592-394-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/592-394-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/592-394-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/592-394-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/592-394-2.png"> | |
| 5223. |
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. | perferably 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. perferably flow outside the tube. | |
| 5224. |
The raio, is normally taken as |
| A. | 0.15-030 |
| B. | 0.5-0.65 |
| C. | 0.75-0.85 |
| D. | 0.60-0.90 |
| Answer» B. 0.5-0.65 | |
| 5225. |
A/an __________ is used for changing the direction of a pipeline. |
| A. | elbow |
| B. | union |
| C. | flange |
| D. | disc compensator |
| Answer» B. union | |
| 5226. |
Pick out the wrong statement pertaining to the design of the distillation column. |
| A. | Generally, a skirt clerance of 0.5" to 1.5' is recommended to prevent plugging of the slots by residue build up. |
| B. | The purpose of the slot is to disperse the gas into the liquid in the form of small bubbles. |
| C. | If sufficient slot area is not provided, the gas may pass through the skirt clearance. |
| D. | none of these. |
| Answer» E. | |
| 5227. |
In distillation columns, bubble caps are held in place over trays by |
| A. | rivets |
| B. | a hold down bar |
| C. | bolts |
| D. | both (b) and (c) |
| Answer» E. | |
| 5228. |
The buckling tendency of compression members is always in the direction of the |
| A. | least radius of gyration. |
| B. | axis of the load. |
| C. | perpendicular to the axis of the load. |
| D. | none of these. |
| Answer» B. axis of the load. | |
| 5229. |
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 | |
| 5230. |
Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle ? |
| A. | Segmental baffle |
| B. | Flat plate extending across the wall |
| C. | Disk type baffle |
| D. | Helical type baffle |
| Answer» C. Disk type baffle | |
| 5231. |
A certain pressure vessel manufacturer avoids doing reinforcements calculations for openings by always providing a reinforcing pad extending upto double the diameter of the opening and of the same material and thickness as that of the shell wall. If area compensation is accepted as a code guideline, his approach leads to safe design |
| A. | only if the opening is on spherical vessel. |
| B. | only if the opening is on a vertical cylinderical vessel. |
| C. | only if the opening is on a horizontal cylinderical vessel. |
| D. | irrespective of the shape of the vessel. |
| Answer» E. | |
| 5232. |
In a __________ rivetted joint, the number of rivets decreases from the innermost row to the outermost row. |
| A. | chain |
| B. | diamond |
| C. | zig-zag |
| D. | none of these |
| Answer» C. zig-zag | |
| 5233. |
Large process vessels operating under extreme temperature and pressure conditions are normally clad/ lined with materials like stainless steel, aluminium, nickel & its alloys, copper & its alloys and titanium. The cladding thickness is generally about __________ percent of the total thickness. |
| A. | 1 to 5 |
| B. | 10 to 20 |
| C. | 30 to 40 |
| D. | 40 to 50 |
| Answer» C. 30 to 40 | |
| 5234. |
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). | |
| 5235. |
The minimum baffle height should be |
| A. | equal to the impeller diameter. |
| B. | twice the impeller diameter. |
| C. | twice the tank diameter. |
| D. | 3/4 of the tank height. |
| Answer» C. twice the tank diameter. | |
| 5236. |
The normal range of velocity of water in pipes is __________ m/sec. |
| A. | 0.1-0.5 |
| B. | 1-2 |
| C. | 10-50 |
| D. | 15-30 |
| Answer» C. 10-50 | |
| 5237. |
Minimum tube pitch recommended for shell and tube heat exchangers is about __________ times the outside diameter of the tube. |
| A. | 1.25 |
| B. | 1.75 |
| C. | 2.5 |
| D. | 3.5 |
| Answer» B. 1.75 | |
| 5238. |
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 | |
| 5239. |
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 | |
| 5240. |
In case of saddle packing (e.g., berl and intralox saddles), the maximum size of the packing should not exceed __________ of the column diameter. |
| A. | l/5th |
| B. | l/15th |
| C. | l/30th |
| D. | l/50th |
| Answer» C. l/30th | |
| 5241. |
Seamless pipe is made |
| A. | from rolled strips formed into cylinders and seam-welded. |
| B. | by extrusion & casting into static and centrifugal molds. |
| C. | by forging a solid round, piercing it by simultaneously rotating & forcing it over a piercer point and further reducing it by rolling gas drawing. |
| D. | both (b) and (c). |
| Answer» E. | |
| 5242. |
Stress-strain diagram for low carbon steel/mild steel is shown below in the Fig. The point 'A' on the Fig. represents the |
| A. | breaking stress |
| B. | ultimate stress |
| C. | elastic limit |
| D. | yield point |
| Answer» D. yield point | |
| 5243. |
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" | |
| 5244. |
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 | |
| 5245. |
Which of the following factors determine the amount of entrainment in a distillation column ? |
| A. | Plate spacing. |
| B. | Depth of liquid above the bubble cap slots. |
| C. | Vapour velocity in the volume between the plates. |
| D. | All (a), (b) and (c). |
| Answer» E. | |
| 5246. |
A pressure vessel is said to be made of 'thick' shell, if the ratio of its diameter to wall thickness is |
| A. | 10 |
| B. | 10 |
| C. | 20 |
| D. | 20 |
| Answer» B. 10 | |
| 5247. |
Rate of filtrate delivery is inversely proportional to the |
| A. | filtering area & the pressure difference driving force. |
| B. | viscosity of filtrate. |
| C. | cake & filter medium resistance. |
| D. | both (a) and (b) |
| Answer» E. | |
| 5248. |
Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is __________ the longitudinal stress. |
| A. | half |
| B. | equal to |
| C. | twice |
| D. | eight times |
| Answer» D. eight times | |
| 5249. |
The dust collection efficiency of electrostatic precipitator increases with increase in the |
| A. | gas flow rate. |
| B. | electrode area. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» C. both (a) & (b). | |
| 5250. |
In a rotary drier, the average retention time of solid is(where Z = length of the drier, metres = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see. m2 drier cross-section H = hold up of solid.) |
| A. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/569-134-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/569-134-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/569-134-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/569-134-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/569-134-2.png"> | |