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.
| 201. |
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. | |
| 202. |
In a vertical short tube evaporator (Calandria type), the ______________________? |
| A. | Tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylindrical 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 A., B. & C. |
| Answer» E. | |
| 203. |
In a thin cylindrical shell, the hoop stress is ________________ stress? |
| A. | Radial |
| B. | Circumferential tensile |
| C. | Compressive |
| D. | Longitudinal |
| Answer» C. Compressive | |
| 204. |
In a shell and tube heat exchanger, tube side _______________ of the mass velocity? |
| A. | Heat transfer co-efficient is proportional to 0.8th power |
| B. | Pressure drop is proportional to the square |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 205. |
In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement ? |
| A. | Results in higher shell side pressure drop |
| B. | Can accomodate less number of tubes for a given shell diameter |
| C. | Facilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell side fluid |
| D. | Creates relatively lower turbulence on the shell side resulting in lower shell side heat transfer co-efficient |
| Answer» B. Can accomodate less number of tubes for a given shell diameter | |
| 206. |
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 adjacent tube holes |
| C. | Shortest centre to centre distance between adjacent tubes |
| D. | None of these |
| Answer» D. None of these | |
| 207. |
In a shell and tube heat exchanger, the shortest centre to centre distance between the adjacent tubes is__________________? |
| A. | Called tube pitch |
| B. | Called tube clearance |
| C. | Always less than the diameter of the tube |
| D. | None of these |
| Answer» B. Called tube clearance | |
| 208. |
In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to____________________? |
| A. | ∞ |
| B. | 1 |
| C. | 20.8 |
| D. | 2 |
| Answer» C. 20.8 | |
| 209. |
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 | |
| 210. |
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 – rd2/4)/rd |
| C. | 4P2/πd |
| D. | πd/4P2 |
| Answer» B. (P2 – rd2/4)/rd | |
| 211. |
In a shell and tube heat exchanger having triangular pitch, the shell side equivalent diameter is given by________________? |
| A. | 4(0.86P2 – πd2/4)/πd |
| B. | (P2 – πd2/4)/πd |
| C. | 4(0.86P2 – πd2)/πd |
| D. | (4P2 + πd2/4)/πd |
| Answer» B. (P2 – πd2/4)/πd | |
| 212. |
In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones; because the smaller diameter tubes ______________? |
| A. | Are easier to clean |
| B. | Are less prone to fouling |
| C. | Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less |
| D. | None of these |
| Answer» D. None of these | |
| 213. |
In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres ρ = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see. m2 drier crosssection H = hold up of solid.) ? |
| A. | Z.H.ρ/L |
| B. | L/Z.H.ρ |
| C. | H.ρ/L |
| D. | Z.H/ρL |
| Answer» B. L/Z.H.ρ | |
| 214. |
In a ______________ riveted joint, the rivets in the various rows are opposite to each other? |
| A. | Zig-zag |
| B. | Chain |
| C. | Diamond |
| D. | None of these |
| Answer» C. Diamond | |
| 215. |
In a _____________ riveted 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 | |
| 216. |
In a pressure vessel containing multiple openings of various dimensions at different parts, stress concentration at the edges of the opening is maximum which becomes negligibly small beyond the area covered by ______________ times the hole diameter? |
| A. | Two |
| B. | Five |
| C. | Ten |
| D. | Twenty |
| Answer» B. Five | |
| 217. |
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 | |
| 218. |
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. | |
| 219. |
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. | |
| 220. |
In a heat exchanger, shell side fluid velocity can be changed by changing the tube _______________________? |
| A. | Layout |
| B. | Pitch |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 221. |
In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be_________________? |
| A. | Same as that for fluid flow |
| B. | Less than that for fluid flow |
| C. | More than that for fluid flow |
| D. | D2 – D1 (D1 and D2 are I.D. of inner and outer pipes respectively) |
| Answer» D. D2 – D1 (D1 and D2 are I.D. of inner and outer pipes respectively) | |
| 222. |
In a distillation column, the minimum residence time for liquid in the downspout is about ______________ seconds? |
| A. | 1 |
| B. | 8 |
| C. | 80 |
| D. | 180 |
| Answer» C. 80 | |
| 223. |
In a distillation column, minimum clearance to be maintained between the overflow weir and the last row of the bubble caps is ______________ cms? |
| A. | 2.5 |
| B. | 7.5 |
| C. | 15 |
| D. | 20 |
| Answer» C. 15 | |
| 224. |
In a distillation column, bubble caps are located on trays with a pitch of ______________ times the outside diameter of the caps? |
| A. | 1.3 to 2 |
| B. | 1.6 to 2 |
| C. | 2.5 |
| D. | 1.5 to 3 |
| Answer» B. 1.6 to 2 | |
| 225. |
In a cylindrical vessel subjected to internal pressure, the longitudinal stress ζL and the circumferential stress, ζn are related by___________________? |
| A. | ζh = 2 ζL |
| B. | ζh = ζL |
| C. | ζh = ζL/2 |
| D. | No relation exists |
| Answer» B. ζh = ζL | |
| 226. |
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 | |
| 227. |
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 | |
| 228. |
If ‘D’ is the inside diameter of the shell of a shell and tube heat exchanger, then the baffle spacing is usually in the range of__________________? |
| A. | D/2 or minimum 2″ to 5D |
| B. | D/5 or minimum 2″ to 5D |
| C. | D/5 or minimum 2″ to D |
| D. | None of these |
| Answer» C. D/5 or minimum 2″ to D | |
| 229. |
If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will _____________ times? |
| A. | Increase by 1.8 |
| B. | Decrease by 22 |
| C. | Increase by 21.6 |
| D. | None of these |
| Answer» D. None of these | |
| 230. |
Hoop (circumferential) stress induced in a thin walled ‘Horton Sphere’ used for the storage of liquid ammonia under pressure is____________________? |
| A. | pD/2T |
| B. | pD/4T |
| C. | pD/3T |
| D. | pD/6T |
| Answer» B. pD/4T | |
| 231. |
Hole diameter of the sieve trays in the distillation column ranges from ______________ mm? |
| A. | 1 to3 |
| B. | 4 to 8 |
| C. | 3 to 12.5 |
| D. | 12.5 to 18.5 |
| Answer» D. 12.5 to 18.5 | |
| 232. |
Holes of a sieve tray are arranged in triangular pitch of _________________ times the hole diameter? |
| A. | 1.5 to 2 |
| B. | 2.5 to 5 |
| C. | 5 to 10 |
| D. | 10 to 15 |
| Answer» C. 5 to 10 | |
| 233. |
Hold up of material in a operating rotary drier is in the range of___________________? |
| A. | 0.05 to 0.15 |
| B. | 0.25 to 0.50 |
| C. | 0.5 to 0.8 |
| D. | 0.8 to 0.9 |
| Answer» B. 0.25 to 0.50 | |
| 234. |
High pressure fluid in a shell and tube heat exchanger should preferably be routed through the________________? |
| A. | Tubes to avoid the expansion of high pressure shell construction |
| B. | Shell side for smaller total pressure drop |
| C. | Shell side, if the flow is counter-current and tube side if the flow is co-current |
| D. | Shell side for large overall heat transfer co-efficient |
| Answer» B. Shell side for smaller total pressure drop | |
| 235. |
Height of the flights in the rotary drier is in the range of___________________? |
| A. | 0.08 to 0.12 d |
| B. | 0.02 to 0.05 d |
| C. | 0.2 to 0.5 d |
| D. | 0.5 to 0.6 d |
| Answer» B. 0.02 to 0.05 d | |
| 236. |
Height equivalent to a theoretical plate (HETP) is the height of packing that will give the same separation as one theoretical plate in gas-liquid mass transfer operations like distillation, absorption/stripping and humidification/dehumidification. HETP which is experimentally determined, depends upon the_______________? |
| A. | Flow rates of each fluid |
| B. | Type and size of packing |
| C. | Concentration of each fluid |
| D. | All A, B. & C. |
| Answer» E. | |
| 237. |
Heat transfer co-efficient, hG(Kcal/hr.m2 .°C) and mass velocity of air, G (kg/hr.m2 ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to ____________________? |
| A. | hG = 1.004G0.37 |
| B. | 1.004G0.8 |
| C. | hG = 0.0176G0.37 |
| D. | 0.0176G1.37 |
| Answer» B. 1.004G0.8 | |
| 238. |
Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is_______________? |
| A. | Same |
| B. | Less |
| C. | About 3 times |
| D. | About 0.33 times |
| Answer» D. About 0.33 times | |
| 239. |
_____________ heat exchanger is also known as ‘hair pin type’ exchanger? |
| A. | Double pipe |
| B. | Finned |
| C. | Plate type |
| D. | Regenerative |
| Answer» B. Finned | |
| 240. |
____________ head is the most economical for cylindrical vessels designed for operating at high pressure (> 15 atm.)? |
| A. | Hemispherical |
| B. | Dished |
| C. | Ellipsoidal |
| D. | Conical |
| Answer» D. Conical | |
| 241. |
Hazards associated with the relief valve leakage for extremely hazardous material storage can be taken care of by providing___________________? |
| A. | Rupture diaphragm |
| B. | Dikes |
| C. | Surge chamber |
| D. | None of these |
| Answer» B. Dikes | |
| 242. |
Generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than ______________ mm? |
| A. | 10 |
| B. | 20 |
| C. | 30 |
| D. | 5 |
| Answer» D. 5 | |
| 243. |
Generally, elliptical dished heads____________________? |
| A. | Are manufactured on 2:1 ratio of major to minor axis and is recommended to be used for pressure vessels operating above a pressure of 1.5 MN/m2 |
| B. | Resist half the pressure rating compared to hemi spherical head provided on the cylindrical shell of the same thickness and diameter |
| C. | Are approximately as strong as seamless cylindrical shell having the corresponding I.D and O.D |
| D. | All A., B. and C. |
| Answer» E. | |
| 244. |
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. | Remain same |
| D. | May increase or decrease depending upon the plate spacing |
| Answer» B. Decreases | |
| 245. |
Friction factor for turbulent flow in a new pipe is given by____________________? |
| A. | f = 16/NRe |
| B. | f = 0.04/(NRe)0.16 |
| C. | f = 0.22 NRe 0.5 |
| D. | f = 25/NRe |
| Answer» C. f = 0.22 NRe 0.5 | |
| 246. |
Fresh water carrying pipelines in chemical industries are coloured with _______________ color? |
| A. | Sea green |
| B. | Brown |
| C. | Yellow |
| D. | Red |
| Answer» B. Brown | |
| 247. |
Frame thickness in the plate and frame filter press is normally in the range of ______________ inches? |
| A. | 0.25 to 4 |
| B. | 0.25 to 8 |
| C. | 1 to 5 |
| D. | 1 to 12 |
| Answer» C. 1 to 5 | |
| 248. |
Fouling factor must be included in the calculation of overall design heat transfer coefficient, when the liquid__________________? |
| A. | Containing suspended solids flows at low velocity |
| B. | Containing suspended solids flows at high velocity |
| C. | Is highly viscous |
| D. | Is of high specific gravity |
| Answer» B. Containing suspended solids flows at high velocity | |
| 249. |
For turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft3/sec, ρ = fluid density, lb/ft3 μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches) ? |
| A. | Di, opt = 3.9 Q0.45 ρ0.13 |
| B. | Di, opt = 3.9 Q0.45. μ0.95 |
| C. | Di, opt = 4.7 Q0.36. μ3.2ρ0.13 |
| D. | Di, opt = 3 Q0.36. μ0.88 |
| Answer» B. Di, opt = 3.9 Q0.45. μ0.95 | |
| 250. |
For turbine agitator, the impeller diameter is about_________________? |
| A. | 0.3 to 0.5 d |
| B. | 0.1 to 0.2 d |
| C. | 0.65 to 0.85 d |
| D. | 0.95 d |
| Answer» B. 0.1 to 0.2 d | |