MCQOPTIONS
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MCQOPTIONS
This section includes 590 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. |
Molality is defined as the number of gm moles of solute per _________________ of solvent ? |
| A. | Litre |
| B. | gm |
| C. | Kg |
| D. | m3 |
| Answer» D. m3 | |
| 252. |
Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the _______________ moisture? |
| A. | Bound |
| B. | Unbound |
| C. | Critical |
| D. | None of these |
| Answer» B. Unbound | |
| 253. |
Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the ___________________ moisture ? |
| A. | Unbound |
| B. | Critical |
| C. | Free |
| D. | Bound |
| Answer» B. Critical | |
| 254. |
Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the _______________ moisture? |
| A. | Free |
| B. | Unbound |
| C. | Equilibrium |
| D. | Bound |
| Answer» D. Bound | |
| 255. |
Moisture contained by a substance in excess of the equilibrium moisture is called the _______________ moisture? |
| A. | Unbound |
| B. | Free |
| C. | Critical |
| D. | Bound |
| Answer» C. Critical | |
| 256. |
Minimum reflux ratio in a distillation column results in__________________? |
| A. | Optimum number of trays |
| B. | Minimum reboiler size |
| C. | Maximum condenser size |
| D. | Minimum number of trays |
| Answer» D. Minimum number of trays | |
| 257. |
Minimum reflux ratio in a distillation column results in_____________________? |
| A. | Optimum number of trays |
| B. | Minimum reboiler size |
| C. | Maximum condenser size |
| D. | Minimum number of trays |
| Answer» D. Minimum number of trays | |
| 258. |
Minimum possible diameter of a packed column is decided mainly by the________________________? |
| A. | Flooding |
| B. | Gas viscosity |
| C. | Liquid density |
| D. | Liquid hold up |
| Answer» B. Gas viscosity | |
| 259. |
Milk is dried usually in a __________________ dryer? |
| A. | Freeze |
| B. | Spray |
| C. | Tray |
| D. | Rotary |
| Answer» C. Tray | |
| 260. |
Mechanism of moisture removal in case of freeze drying of food stuff is by ___________________? |
| A. | Evaporation |
| B. | Sublimation |
| C. | Dehydration |
| D. | Adsorption |
| Answer» C. Dehydration | |
| 261. |
Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a _______________ column? |
| A. | Spray |
| B. | Packed |
| C. | Bubble cap plate |
| D. | Wetted wall |
| Answer» E. | |
| 262. |
Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a ________________ column? |
| A. | Spray |
| B. | Packed |
| C. | Bubble cap plate |
| D. | Wetted wall |
| Answer» E. | |
| 263. |
McCabe-Thiele method________________? |
| A. | Uses molal units for material and energy balance |
| B. | Uses weight fractions to express liquid and vapour composition |
| C. | Can use any type of units |
| D. | Is more accurate than Ponchon-Savarit method |
| Answer» B. Uses weight fractions to express liquid and vapour composition | |
| 264. |
McCabe-Thiele method of binary distillation does not assume that the__________________? |
| A. | Sensible heat changes are negligible compared with latent heat changes |
| B. | Molar latent heats of all components are equal |
| C. | Heat of mixing is negligible |
| D. | None of these |
| Answer» E. | |
| 265. |
Mass transfer rate between two fluid phases does not necessarily depend on the ______________ of the two phases? |
| A. | Chemical properties |
| B. | Physical properties |
| C. | Degree of turbulence |
| D. | Interfacial area |
| Answer» B. Physical properties | |
| 266. |
Mass transfer co-efficient varies as DAB 0.5, according to the _______________ theory? |
| A. | Film |
| B. | Surface renewal |
| C. | Penetration |
| D. | None of these |
| Answer» C. Penetration | |
| 267. |
Mass transfer co-efficient of liquid is____________________? |
| A. | Affected more by temperature than that for gases |
| B. | Affected much less by temperature than that for gases |
| C. | Not affected by the temperature |
| D. | None of these |
| Answer» B. Affected much less by temperature than that for gases | |
| 268. |
Mass transfer co-efficient (K) and diffusivity D. are related according to film theory as______________________? |
| A. | K ∝ D |
| B. | K ∝√D |
| C. | K ∝ D1.5 |
| D. | K ∝ D2 |
| Answer» B. K ∝√D | |
| 269. |
Mass transfer co-efficient ‘K’ according to penetration theory varies with mass diffusivity as____________________? |
| A. | D0.5 |
| B. | D |
| C. | 1/D |
| D. | D1.5 |
| Answer» B. D | |
| 270. |
Mass transfer co-efficient is directly proportional to DAB according to the _____________ theory? |
| A. | Film |
| B. | Penetration |
| C. | Surface-renewal |
| D. | None of these |
| Answer» B. Penetration | |
| 271. |
Mass transfer co-efficient is directly proportional to DAB according to the __________ theory? |
| A. | Film |
| B. | Penetration |
| C. | Surface-renewal |
| D. | None of these |
| Answer» B. Penetration | |
| 272. |
Mass transfer co-efficient is directly proportional to DAB 0.5, according to ________________ theory ? |
| A. | Penetration |
| B. | Surface renewal |
| C. | Film |
| D. | None of these |
| Answer» B. Surface renewal | |
| 273. |
Mass transfer co-efficient is defined as__________________? |
| A. | Flux = Co-efficient/concentration difference |
| B. | Co-efficient = Flux/concentration difference |
| C. | Flux=concentration difference/coefficient |
| D. | None of these |
| Answer» C. Flux=concentration difference/coefficient | |
| 274. |
Make up water is supplied during cooling tower operation to compensate for water losses due to______________________? |
| A. | Evaporation |
| B. | Blowdown |
| C. | Entrainment |
| D. | All A., B. & C. |
| Answer» E. | |
| 275. |
Make up water is required in a cooling tower to replace the water lost by___________________? |
| A. | Evaporation |
| B. | Drift |
| C. | Blowdown and leakage |
| D. | All A., B. and C. |
| Answer» E. | |
| 276. |
Low viscosity absorbent is preferred for reasons of ____________________? |
| A. | Rapid absorption rates and good heat transfer characteristics |
| B. | Improved flooding characteristics |
| C. | Low pressure drop on pumping |
| D. | All A., B. and C. |
| Answer» E. | |
| 277. |
Liquid diffusivity is of the order of _______________ cm2 /second? |
| A. | 0.01 |
| B. | 0.1 |
| C. | 10-5 to 10-6 |
| D. | > 1 |
| Answer» D. > 1 | |
| 278. |
Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of__________________? |
| A. | Mass diffusivity to momentum diffusivity |
| B. | Thermal diffusivity to mass diffusivity |
| C. | Momentum diffusivity to thermal diffusivity |
| D. | None of these |
| Answer» C. Momentum diffusivity to thermal diffusivity | |
| 279. |
Lewis number (Le) is____________________? |
| A. | Sc × Pr |
| B. | Pr × St |
| C. | Sh × Pr |
| D. | St × Sh |
| Answer» B. Pr × St | |
| 280. |
Lewis number (Le) is___________________? |
| A. | Sc × Pr |
| B. | Pr × St |
| C. | Sh × Pr |
| D. | St × Sh |
| Answer» B. Pr × St | |
| 281. |
Leaching of uranium ore and gold ore is done in________________________? |
| A. | Centrifugal extractor |
| B. | Pachuca tanks |
| C. | Bollman extractor |
| D. | None of these |
| Answer» C. Bollman extractor | |
| 282. |
Leaching rate is independent of the________________? |
| A. | Agitation |
| B. | Temperature |
| C. | Particle size |
| D. | None of these |
| Answer» E. | |
| 283. |
Leaching of uranium ore and gold ore is done in_____________________? |
| A. | Centrifugal extractor |
| B. | Pachuca tanks |
| C. | Bollman extractor |
| D. | None of these |
| Answer» C. Bollman extractor | |
| 284. |
Leaching of sugar from sugar beets is done by___________________? |
| A. | Hot water |
| B. | Hexane |
| C. | Dilute H2SO4 |
| D. | Lime water |
| Answer» B. Hexane | |
| 285. |
Leaching of coffee from coffee beans is done by___________________? |
| A. | Hot water |
| B. | Hexane |
| C. | Lime water |
| D. | Dilute H2SO4 (hot) |
| Answer» B. Hexane | |
| 286. |
Leaching of coarse solid lumps is also termed as _____________________? |
| A. | Decoction |
| B. | Dissolution |
| C. | Percolation |
| D. | Agitation and settling |
| Answer» D. Agitation and settling | |
| 287. |
Large scale usage of flash distillation is practised in __________________? |
| A. | Soap manufacturing |
| B. | Ammonia synthesis plant |
| C. | Polymerisation industry |
| D. | Petroleum refining |
| Answer» E. | |
| 288. |
Large scale drying of wheat is done in a ________________ dryer? |
| A. | Fluidised bed |
| B. | Spouted bed |
| C. | Tray |
| D. | Vacuum rotary |
| Answer» C. Tray | |
| 289. |
Large scale drying of sugar is done in a _______________ dryer? |
| A. | Spouted bed |
| B. | Tray |
| C. | Rotary |
| D. | Truck |
| Answer» D. Truck | |
| 290. |
Large quantity of silica gel is normally dried in a _________________ dryer? |
| A. | Freeze |
| B. | Through circulation |
| C. | Rotary vacuum |
| D. | Tray |
| Answer» C. Rotary vacuum | |
| 291. |
Langmuir equation is associated with________________________? |
| A. | Leaching |
| B. | Adsorption |
| C. | Steam distillation |
| D. | Multi-component absorption |
| Answer» C. Steam distillation | |
| 292. |
Laboratory determination of the diffusivity of vapor is done by __________________ method? |
| A. | Wetted wall column |
| B. | Gilliland’s |
| C. | Winkelmann’s |
| D. | Wike’s |
| Answer» D. Wike’s | |
| 293. |
Laboratory determination of the diffusivity of vapor is done by ______________ method? |
| A. | Wetted wall column |
| B. | Gilliland’s |
| C. | Winkelmann’s |
| D. | Wike’s |
| Answer» D. Wike’s | |
| 294. |
JD factor for mass transfer is a function of Reynolds number. Mass transfer by molecular diffusion from a single drop to surrounding still air is given by___________________? |
| A. | Nsh = 2 |
| B. | Nst = 2 |
| C. | Nsc = 2 |
| D. | None of these |
| Answer» B. Nst = 2 | |
| 295. |
It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%) ? |
| A. | 15 min |
| B. | 51 min |
| C. | 71 min |
| D. | 94 min |
| Answer» D. 94 min | |
| 296. |
_____________ is used as an ‘entrainer’ for the separation of acetic acid-water mixture by distillation? |
| A. | Furfural |
| B. | Benzol |
| C. | Butyl acetate |
| D. | Hexane |
| Answer» D. Hexane | |
| 297. |
_____________ is the temperature at which a gas-vapor mixture becomes saturated, when cooled at constant total pressure out of contact with a liquid ? |
| A. | Dew point |
| B. | Bubble point |
| C. | Dry bulb temperature |
| D. | Wet bulb temperature |
| Answer» B. Bubble point | |
| 298. |
_________________ is the separation technique used for desalination of sea water ? |
| A. | Thermal diffusion |
| B. | Reverse osmosis |
| C. | Adsorption |
| D. | Absorption |
| Answer» C. Adsorption | |
| 299. |
__________________ is concerned with the adsorption equilibria? |
| A. | Fick’s law |
| B. | Gibb’s equation |
| C. | Freundlich equation |
| D. | None of these |
| Answer» D. None of these | |
| 300. |
Ion exchange process is similar to___________________? |
| A. | Absorption |
| B. | Adsorption |
| C. | Extraction |
| D. | Leaching |
| Answer» C. Extraction | |