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.
| 251. |
*$_In case of design of a shell and tube heat exchanger,? |
| A. | Minimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch |
| B. | Minimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto 15 mm tube diameter; and for > 15 mm tube diameter, tube sheet thickness is smaller than tube diameter |
| C. | O.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres |
| D. | All of the above |
| Answer» E. | |
| 252. |
*$_In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for? |
| A. | Reducing scale deposition |
| B. | Increasing pressure drop |
| C. | Fixing the tubes |
| D. | Creating turbulence |
| Answer» E. | |
| 253. |
*$_Flanges are connected to pipes by? |
| A. | Screwing |
| B. | Welding |
| C. | Brazing |
| D. | All of the above |
| Answer» E. | |
| 254. |
*$_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 | |
| 255. |
*$_The maximum liquid gradient over a tray must not exceed? |
| A. | 0.5" -1.25" |
| B. | 2"-3.5" |
| C. | 5" |
| D. | Half the tray spacing |
| Answer» B. 2"-3.5" | |
| 256. |
*$_Fresh water carrying pipelines in chemical industries are coloured with __________ color.? |
| A. | Sea green |
| B. | Brown |
| C. | Yellow |
| D. | Red |
| Answer» B. Brown | |
| 257. |
*$_A claming section before the liquid flows into the downcomer is privided to? |
| A. | Permit release of entrained vapour in the liquid |
| B. | Reduce the discharge fluctuation |
| C. | Ensure better vapour-liquid contact |
| D. | Cool the liquid before it flows down |
| Answer» B. Reduce the discharge fluctuation | |
| 258. |
*$_In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the? |
| A. | Liquid gradient on the tray |
| B. | Lower skirt clearance |
| C. | Lower static submergence |
| D. | Small downcomer liquid seal |
| Answer» B. Lower skirt clearance | |
| 259. |
*$_At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure? |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | May increase or decrease depending upon the solubility of the gas in the liquid |
| Answer» D. May increase or decrease depending upon the solubility of the gas in the liquid | |
| 260. |
*$_What is the slope of the feed line, if the feed to a distillation column is a saturated liquid?? |
| A. | 0 |
| B. | ‚à û |
| C. | > 1 |
| D. | < 1 |
| Answer» C. > 1 | |
| 261. |
*$_What is the value of 'q' for saturated vapor feed to a distillation column ?(where q = fraction of the feed stream that is liquid.)? |
| A. | 0 |
| B. | 1 |
| C. | <0 |
| D. | > 1 |
| Answer» B. 1 | |
| 262. |
*$_In a bag filter, the pressure drop increases directly as the? |
| A. | Density of the gas, but is independent of the viscosity of the gas |
| B. | Density of the gas and inversely as viscosity of the gas |
| C. | Viscosity of the gas and inversely as density of the gas |
| D. | None of these |
| Answer» C. Viscosity of the gas and inversely as density of the gas | |
| 263. |
*$_The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is? |
| A. | 0.25 |
| B. | 0.50 |
| C. | 0.75 |
| D. | 1.25 |
| Answer» B. 0.50 | |
| 264. |
*$_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 | |
| 265. |
*$___________ shapedroof is the most commonly used roof for cylinderical storage tanks.? |
| A. | Conical |
| B. | Flat |
| C. | Dome |
| D. | Umbrella |
| Answer» B. Flat | |
| 266. |
*$_What is the slope of the operating line in the stripping section of a distillation column?? |
| A. | 0 |
| B. | ? |
| C. | > 1 |
| D. | < 1 |
| Answer» D. < 1 | |
| 267. |
*$_Theoretically calculated diameter of the stripping section of the continuous rectification column is __________ that of the enriching section.? |
| A. | Less than |
| B. | More than |
| C. | Same as |
| D. | Either more or less (depending upon relative volatility) |
| Answer» C. Same as | |
| 268. |
*$_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 of the above |
| Answer» E. | |
| 269. |
*$_Friction factor for turbulent flow in a new pipe is given by? |
| A. | f = 16/NRe |
| B. | f = 0.04/NRe0.16 |
| C. | f = 0.22 NRe0.05 |
| D. | f = 25/NRe |
| Answer» C. f = 0.22 NRe0.05 | |
| 270. |
*$_For given number of passes, pitch & tube diameter, the maximum number of tubes that can be accommodated in a shell of tripled inside diameter will be __________ times.? |
| A. | About 9 |
| B. | Considerably more than 9 |
| C. | Considerably less than 9 |
| D. | About 3 |
| Answer» C. Considerably less than 9 | |
| 271. |
*$_In a multipass shell and tube heat exchanger, the problem of differential expansion between the shell and tube passes is taken care of by using a? |
| A. | U-bend |
| B. | Floating head tube sheet |
| C. | Either A or B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 272. |
*$_Liquid gradient over the tray results due to the? |
| A. | Resistance offered to flow of liquids by caps & risers and the flow of gas |
| B. | Low gas velocity |
| C. | Large plate spacing |
| D. | Large reflux ratio |
| Answer» B. Low gas velocity | |
| 273. |
*$_Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if? |
| A. | Plain carbon steel and cast iron parts are used |
| B. | Wall thickness is > 30 mm |
| C. | Material of construction is high alloy steel |
| D. | Both B & C |
| Answer» E. | |
| 274. |
*$_What is the value of 'q' for saturated liquid feed to a distillation column?? |
| A. | 0 |
| B. | <1 |
| C. | 1 |
| D. | >1 |
| Answer» D. >1 | |
| 275. |
*$_The wall thickness for a large high pressure pipeline is determined by the consideration of the? |
| A. | Axial tensile stress in the pipe |
| B. | Forces exerted by static and dynamic action at bends |
| C. | Circumferential pipewall tension |
| D. | Temperature stresses |
| Answer» D. Temperature stresses | |
| 276. |
*$_Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is? |
| A. | More |
| B. | Less |
| C. | Same |
| D. | More or less depending upon the pressure & temperature inside the vessel and the nature of the fluid contained therein |
| Answer» C. Same | |
| 277. |
*$_The buckling tendency of compression members is always in the direction of the? |
| A. | Least radius of gyration |
| B. | Axis of the load |
| C. | Perpendicular to the axis of the load |
| D. | None of these |
| Answer» B. Axis of the load | |
| 278. |
*$_In a vertical short tube evaporator (Calendria type), the? |
| A. | Tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylinderical drum dia of 1-6 metres are normally used |
| B. | Area of central downtake is equal to 40 to 100% of total cross-sectional area of the surrounding tube |
| C. | Liquor is inside the tube while the steam is outside the tube |
| D. | All of the above |
| Answer» E. | |
| 279. |
*$_In case of 1.5" heat exchanger tubes, the inside flow area __________ with decrease in BWG.? |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | None of these |
| Answer» C. Remains same | |
| 280. |
*$_A stuffing box is used for? |
| A. | Absorbing the contraction/expansion of pipeline due to temperature changes |
| B. | Prevention of fluid leakage around moving parts |
| C. | Facilitating smooth opening and closing of a valve |
| D. | Reducing the resistance of fluid flow |
| Answer» C. Facilitating smooth opening and closing of a valve | |
| 281. |
*$_Le/D for a Tee (used as elbow, entering branch) would be? |
| A. | Less than that for Tee (used as elbow, entering run) |
| B. | More than that for Tee (used as elbow, entering run) |
| C. | Around 90 |
| D. | Both B and C |
| Answer» E. | |
| 282. |
*$___________ is the determining factor for the number of bubble caps to be used per tray.? |
| A. | Permissible slot velocity |
| B. | Tray diameter |
| C. | Liquid load |
| D. | Vapor load |
| Answer» B. Tray diameter | |
| 283. |
*/*_The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles?? |
| A. | To increase the residence time of shell side fluid |
| B. | To provide support to the tube bundle |
| C. | To reduce the induced vibration in the tubes |
| D. | To increase the tube side heat transfer co-efficient by inducing turbulence |
| Answer» E. | |
| 284. |
*/*_Which of the following is used to set the diameter of the distillation column?? |
| A. | Number of theorectical plates |
| B. | Static submergence |
| C. | Allowable vapour velocity |
| D. | Length of straight rectangular weir on cross-flow tray |
| Answer» D. Length of straight rectangular weir on cross-flow tray | |
| 285. |
*/*_In a shell and tube heat exchanger, the clearance of the tube is generally? |
| A. | Not less than one-fourth of the tube diameter or 3/16" |
| B. | More than the tube diameter |
| C. | Equal to the tube diameter |
| D. | More in case of triangular pitch as compared to the square pitch tube layout |
| Answer» B. More than the tube diameter | |
| 286. |
*/*_In a thin cylindrical shell, the hoop stress is __________ stress.? |
| A. | Radial |
| B. | Circumferential tensile |
| C. | Compressive |
| D. | Longitudinal |
| Answer» C. Compressive | |
| 287. |
*/*_Which of the following factors affect the pressure drop in a co-current gas-liquid absorption packed tower?? |
| A. | Size, shape, orientation and surface of the packing particles |
| B. | Density and viscosity of fluids |
| C. | Fluid flow rates |
| D. | All of the above |
| Answer» E. | |
| 288. |
*/*_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. | |
| 289. |
*/*_Pressure drop (Δp) and the superficial gas mass velocity (G) in case of packed absorption tower operating in the preloading range are related as? |
| A. | Δp = G |
| B. | Δp = G0.5 |
| C. | Δp = G2 |
| D. | Δp = 1/G0.6 |
| Answer» D. ≈í√Æp = 1/G0.6 | |
| 290. |
*/*_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 | |
| 291. |
*/*_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 & B |
| Answer» E. | |
| 292. |
*/*_In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube)? |
| A. | 4(P² - πd²/4)/πd |
| B. | (P² - πd²/4)/πd |
| C. | 4P²/πd |
| D. | Πd/4P² |
| Answer» B. (P¬¨‚⧠- ≈ì√Ñd¬¨‚â§/4)/≈ì√Ñd | |
| 293. |
*/*_Apex angle of conical heads used in the bottom heads of chemical process equipments is usually? |
| A. | 30° |
| B. | 45° |
| C. | 60° |
| D. | 75° |
| Answer» D. 75¬¨‚àû | |
| 294. |
*/*_In case of bubble cap distillation column of diameter greater than 1.2 metres, the cap diameter is roughly about __________ cms.? |
| A. | 10 |
| B. | 20 |
| C. | 30 |
| D. | 35 |
| Answer» B. 20 | |
| 295. |
*/*_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 | |
| 296. |
*/*_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 | |
| 297. |
*/*_Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always? |
| A. | Less than arithmetic mean value |
| B. | More than arithmetic mean value |
| C. | More than geometric mean value |
| D. | Both B & C |
| Answer» B. More than arithmetic mean value | |
| 298. |
*/*_In chemical process equipments, the conical bottom heads used, usually has an apex angle of? |
| A. | 20° |
| B. | 40° |
| C. | 60° |
| D. | 80° |
| Answer» D. 80¬¨‚àû | |
| 299. |
*/*_Generally, as the length of the liquid path on a tray is increased beyond 5 ft, the overall column efficiency? |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | May increase or decrease depending upon the plate spacing |
| Answer» B. Decreases | |
| 300. |
*/*_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 | |