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.
| 301. |
Inside the distillation column, the________________________? |
| A. | Driving force for the vapour flow is the pressure drop |
| B. | Liquids are not always at their bubble points |
| C. | Pressure increases gradually from bottom to the top of the column |
| D. | None of these |
| Answer» B. Liquids are not always at their bubble points | |
| 302. |
Inside the distillation columns, the ________________________? |
| A. | Highest temperatures is near the feed plate |
| B. | Driving force for the liquid flow is its weight |
| C. | Vapors are not always at their dew points |
| D. | All A., B. and C. |
| Answer» C. Vapors are not always at their dew points | |
| 303. |
In triangular co-ordinates, the ternary composition point falls ___________________ of the triangle? |
| A. | In the corners |
| B. | Inside |
| C. | On the sides |
| D. | None of these |
| Answer» C. On the sides | |
| 304. |
In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be_____________________? |
| A. | At ground level |
| B. | 2 metres above the ground |
| C. | 5 metres above ground |
| D. | 10 metres above ground |
| Answer» B. 2 metres above the ground | |
| 305. |
In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be___________________? |
| A. | At ground level |
| B. | 2 metres above the ground |
| C. | 5 metres above ground |
| D. | 10 metres above ground |
| Answer» B. 2 metres above the ground | |
| 306. |
In the desorption of highly soluble gas from the liquid, the main resistance will be in the ______________ phase? |
| A. | Gas |
| B. | Liquid |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» C. Both A. & B. | |
| 307. |
In the constant rate period of the rate of drying curve for batch drying,_________________? |
| A. | Cracks develop on the surface of the solid |
| B. | Rate of drying decreases abruptly |
| C. | Surface evaporation of unbound moisture occurs |
| D. | None of these |
| Answer» D. None of these | |
| 308. |
In the absorption of ammonia in water, the main resistance to absorption is by the _________________ phase? |
| A. | Liquid |
| B. | Gas |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» C. Both A. & B. | |
| 309. |
In stripping section of continuous distillation column, the_______________________? |
| A. | Liquid is stripped of high boiler |
| B. | Liquid is enriched with high boiler |
| C. | Vapour is stripped of low boiler |
| D. | None of these |
| Answer» C. Vapour is stripped of low boiler | |
| 310. |
In steam distillation, the _____________________? |
| A. | Temperature is 100°C |
| B. | Temperature is more than 100° C |
| C. | Product must be immiscible with water |
| D. | Temperature is higher than the boiling point of either component |
| Answer» D. Temperature is higher than the boiling point of either component | |
| 311. |
In saturated gas, the__________________? |
| A. | Vapour is in equilibrium with the liquid at the gas temperature |
| B. | Vapour is in equilibrium with the liquid at the room temperature |
| C. | Partial pressure of vapour equals the vapour pressure of the liquid at room temperature |
| D. | None of these |
| Answer» B. Vapour is in equilibrium with the liquid at the room temperature | |
| 312. |
In rectifying section of a continuous distillation column, the____________________? |
| A. | Vapour is enriched with low boilers |
| B. | Vapour is enriched with high boilers |
| C. | Liquid is stripped of high boilers |
| D. | None of these |
| Answer» C. Liquid is stripped of high boilers | |
| 313. |
In physical terms, Schmidt number means _________________? |
| A. | Thermal diffusivity/mass diffusivity |
| B. | Thermal diffusivity/momentum diffusivity |
| C. | Momentum diffusivity/mass diffusivity |
| D. | Mass diffusivity/thermal diffusivity |
| Answer» D. Mass diffusivity/thermal diffusivity | |
| 314. |
In paper industry, paper is dried in a _____________ dryer ? |
| A. | Tunnel |
| B. | Heated cylinder |
| C. | Conveyor |
| D. | Festoon |
| Answer» C. Conveyor | |
| 315. |
In most of the vacuum crystalliser, vacuum is generally produced by means of a_____________________? |
| A. | Suction pump |
| B. | Compressed air jet |
| C. | Steam jet ejector with a barometric condenser |
| D. | None of these |
| Answer» D. None of these | |
| 316. |
In most of the mechanically agitated liquid-liquid extractors, baffles or horizontal compartmental plates are provided, which helps in_________________? |
| A. | Reducing the axial mixing |
| B. | Increasing the rate of extraction |
| C. | Maintaining the concentration difference between the two phases |
| D. | All A , B & C. |
| Answer» E. | |
| 317. |
In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at ________________ reflux ? |
| A. | Total |
| B. | Minimum |
| C. | Operating |
| D. | Maximum permissible |
| Answer» B. Minimum | |
| 318. |
In McCabe-Thiele method, at infinite reflux ratio________________? |
| A. | The overhead product is minimum |
| B. | Both the operating lines coincide with diagonal |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» B. Both the operating lines coincide with diagonal | |
| 319. |
In McCabe-Thiele method, at infinite reflux ratio___________________? |
| A. | Number of plates is maximum |
| B. | Overhead product is maximum |
| C. | Both the operating lines coincide with the diagram |
| D. | None of these |
| Answer» D. None of these | |
| 320. |
In liquid-liquid extraction, the number of phases at plait point is __________________? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 321. |
In liquid extraction, if the selectivity is unity, then___________________? |
| A. | Separation of the constituents is the most effective |
| B. | No separation will occur |
| C. | Amount of solvent required will be minimum |
| D. | Solvent flow rate should be very low |
| Answer» C. Amount of solvent required will be minimum | |
| 322. |
In liquid extraction, if the selectivity is unity, then__________________? |
| A. | Separation of the constituents is the most effective |
| B. | No separation will occur |
| C. | Amount of solvent required will be minimum |
| D. | Solvent flow rate should be very low |
| Answer» C. Amount of solvent required will be minimum | |
| 323. |
In gas-liquid contact operation, the number of ideal stages, N = (xa – xb)/(xb – x*b). This is true when the stripping factor ‘S’ is ________________? |
| A. | S > 1 |
| B. | S < 1 |
| C. | S = 1 |
| D. | S = ∞ |
| Answer» B. S < 1 | |
| 324. |
In extraction, as the temperature increases, the area of heterogeneity (area covered by binodal curve)________________? |
| A. | Decreases |
| B. | Increases |
| C. | Remains unchanged |
| D. | None of these |
| Answer» B. Increases | |
| 325. |
In extractive distillation, solvent is_____________________? |
| A. | Added to alter the relative volatility of the mixture |
| B. | Of high volatility |
| C. | Present in overhead stream |
| D. | Of high viscosity to give high tray efficiency |
| Answer» B. Of high volatility | |
| 326. |
In extraction, as the temperature increases, the area of heterogeneity (area covered by binodal curve)____________________? |
| A. | Decreases |
| B. | Increases |
| C. | Remains unchanged |
| D. | None of these |
| Answer» B. Increases | |
| 327. |
In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed____________________? |
| A. | q > 1 |
| B. | q < 1 |
| C. | q = 1 |
| D. | q = 0 |
| Answer» D. q = 0 | |
| 328. |
In distillation, overhead product contains ______________________? |
| A. | Only one component |
| B. | Two components |
| C. | Any number of components |
| D. | Only saturated liquid |
| Answer» D. Only saturated liquid | |
| 329. |
In distillation columns, the number of bubble caps per tray primarily depends upon the_______________________? |
| A. | Allowable liquid velocity |
| B. | Allowable gas velocity |
| C. | Allowable gas and liquid velocities |
| D. | Feed composition |
| Answer» D. Feed composition | |
| 330. |
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as_____________________? |
| A. | Ri = Re/(1 – Re) |
| B. | Ri = (1 – Re)/Re |
| C. | Ri = Re |
| D. | Ri = Re/(1 + Re) |
| Answer» E. | |
| 331. |
In case of unsaturated air____________________? |
| A. | Dew point < wet bulb temperature |
| B. | Wet bulb temperature < dry bulb temperature |
| C. | Both A. and B. |
| D. | Neither A. not B. |
| Answer» D. Neither A. not B. | |
| 332. |
In case of unsaturated air_________________? |
| A. | Dew point < wet bulb temperature |
| B. | Wet bulb temperature < dry bulb temperature |
| C. | Both A. and B. |
| D. | Neither A. not B. |
| Answer» D. Neither A. not B. | |
| 333. |
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because_______________? |
| A. | Temperature is less |
| B. | Total pressure is less |
| C. | Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition |
| D. | Saturated steam is used for steam distillation |
| Answer» D. Saturated steam is used for steam distillation | |
| 334. |
In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is_________________? |
| A. | Equal to the heat of formation of surface compound |
| B. | Equal to the heat of wetting |
| C. | Zero |
| D. | Called integral heat of adsorption |
| Answer» C. Zero | |
| 335. |
In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is__________________? |
| A. | Equal to the heat of formation of surface compound |
| B. | Equal to the heat of wetting |
| C. | Zero |
| D. | Called integral heat of adsorption |
| Answer» C. Zero | |
| 336. |
In case of non-ideal gases and liquids, the molal diffusivity ________________? |
| A. | Varies inversely as the pressure |
| B. | Varies directly as the pressure |
| C. | Is independent of pressure |
| D. | Is equal to the volumetric diffusivity |
| Answer» D. Is equal to the volumetric diffusivity | |
| 337. |
In case of liquids, the binary diffusivity is proportional to (where, T = temperature) _____________________? |
| A. | T |
| B. | √T |
| C. | T2 |
| D. | 1/T |
| Answer» B. √T | |
| 338. |
In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the__________________? |
| A. | Temperature and pressure |
| B. | Concentration |
| C. | Nature of the constituents |
| D. | None of these |
| Answer» E. | |
| 339. |
In case of gases, the binary diffusivity is proportional to (where, P = pressure) ? |
| A. | P |
| B. | 1/P |
| C. | 1/√P |
| D. | √P |
| Answer» C. 1/√P | |
| 340. |
In case of ______________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated? |
| A. | Molecular |
| B. | Azeotropic |
| C. | Extractive |
| D. | Flash |
| Answer» D. Flash | |
| 341. |
In case of constant underflow extraction operation, the _______________________ at all solute concentration? |
| A. | Solids are drained to the same extent |
| B. | Ratio of the insoluble to solution is constant |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 342. |
In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the ______________ number ? |
| A. | Lewis |
| B. | Grashoff |
| C. | Sherwood |
| D. | None of these |
| Answer» B. Grashoff | |
| 343. |
In case of binary distillation, increasing the reflux ratio above optimum does not result in the increase of_______________________? |
| A. | Area between operating line and 45° diagonal x-y diagram |
| B. | Condenser and reboiler surfaces |
| C. | Tower cross-section |
| D. | None of these |
| Answer» B. Condenser and reboiler surfaces | |
| 344. |
In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________________ its relative saturation? |
| A. | Lower than |
| B. | Higher than |
| C. | Equal to |
| D. | Either A. or B., depends on the mixture composition |
| Answer» B. Higher than | |
| 345. |
In case of an ideal solution, the total vapor pressure varies ______________ with the composition expressed as mole fraction? |
| A. | Inversely |
| B. | Linearly |
| C. | Exponentially |
| D. | None of these |
| Answer» C. Exponentially | |
| 346. |
In case of absorption with exothermic reaction, for fluids having ___________________? |
| A. | Pr = Sc; percentage change in heat and mass transfer flux will be the same for a given change in the degree of turbulence |
| B. | Pr = Sc = 1; total mass, momentum and thermal diffusivity will be the same |
| C. | Both A. and B. |
| D. | Pr = Sc; there won’t be any change in heat and mass transfer flux with changes in degree of turbulence |
| Answer» D. Pr = Sc; there won’t be any change in heat and mass transfer flux with changes in degree of turbulence | |
| 347. |
In case of an absorber, the operating _______________? |
| A. | Line always lies above the equilibrium curve |
| B. | Line always lies below the equilibrium curve |
| C. | Line can be either above or below the equilibrium curve |
| D. | Velocity is more than the loading velocity |
| Answer» B. Line always lies below the equilibrium curve | |
| 348. |
In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of _______________ is zero? |
| A. | Interface |
| B. | Gas phase |
| C. | Liquid phase |
| D. | All A , B. & C. |
| Answer» B. Gas phase | |
| 349. |
In case of absorption, both the operating and equilibrium lines will be straight for______________? |
| A. | Isothermal operation |
| B. | Dilute solutions |
| C. | Dilute solutions and isothermal operation |
| D. | None of these |
| Answer» D. None of these | |
| 350. |
In case of a desorber (stripper), the________________? |
| A. | Operating line always lies above the equilibrium curve |
| B. | Operating line always lies below the equilibrium curve |
| C. | Temperature remains unaffected |
| D. | Temperature always increases |
| Answer» C. Temperature remains unaffected | |