MCQOPTIONS
Saved Bookmarks
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.
| 351. |
In Azeotropic mixture, the equilibrium vapour composition is____________________? |
| A. | More than liquid composition |
| B. | Less than liquid composition |
| C. | Same as liquid composition |
| D. | Independent of pressure |
| Answer» D. Independent of pressure | |
| 352. |
In an operating distillation column, the______________________? |
| A. | Vapors and liquids are at their dew point and bubble point respectively |
| B. | Driving force for the liquid flow is its specific weight |
| C. | Driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from the bottom to the top of the column |
| D. | Highest temperature is encountered at the top of the column |
| Answer» D. Highest temperature is encountered at the top of the column | |
| 353. |
In an interphase mass transfer process, the lesser the solubility of a given solute in a liquid, the higher are the chances that the transfer process will be_________________? |
| A. | Liquid phase resistance-controlled |
| B. | Gas phase resistance controlled |
| C. | Impossible |
| D. | Driven by a non-linear driving force |
| Answer» C. Impossible | |
| 354. |
In an absorber, HETP does not vary with the____________________? |
| A. | Flow rate of liquid |
| B. | Flow rate of gas |
| C. | Type and size of packing |
| D. | None of these |
| Answer» E. | |
| 355. |
In an absorption column, the flooding velocity for random packing is ___________________ that for stacked/regular packing? |
| A. | Greater than |
| B. | Smaller than |
| C. | Equal to |
| D. | Either A., or B.; depends on the type of packing |
| Answer» C. Equal to | |
| 356. |
In a vapor-liquid contacting equipment, the overall gas phase mass transfer co-efficient (M.T.C), KG is related to individual co-efficients (KG and KL) as ___________________ ? |
| A. | KG = 1/KG + m/KL |
| B. | 1/KG = 1/KG + m/KL |
| C. | 1/KG = 1/KL + m/KG |
| D. | KG = 1/KL + m/KG |
| Answer» C. 1/KG = 1/KL + m/KG | |
| 357. |
In a solution containing 0.30 Kg mole of solute and 600 kg of solvent, the molality is_______________________? |
| A. | 0.50 |
| B. | 0.60 |
| C. | 1 |
| D. | 2 |
| Answer» B. 0.60 | |
| 358. |
In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raffinate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg) ? |
| A. | 6.89 |
| B. | 8.89 |
| C. | 10 |
| D. | 8.25 |
| Answer» C. 10 | |
| 359. |
In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalent to a theoretical plate HTUOG = overall gas phase height of a transfer unit) ? |
| A. | Straight |
| B. | Parallel |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 360. |
In a packed bed absorption column, the channelling will be noted by the ____________________? |
| A. | Increase in flow rate |
| B. | Sharp drop in pressure drop |
| C. | Sharp rise in pressure drop |
| D. | None of these |
| Answer» C. Sharp rise in pressure drop | |
| 361. |
In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG ______________ the absorption factor? |
| A. | Increases with increase in |
| B. | Is one at unity value of |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 362. |
In a moderately sized packed absorption tower, channelling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter ? |
| A. | > 4 :1 |
| B. | < 8 : 1 |
| C. | > 8:1 |
| D. | < 6:1 |
| Answer» D. < 6:1 | |
| 363. |
In a liquid-liquid extraction, 10 kg of a solution containing 2 kg of solute C and 8 kg of solvent A is brought into contact with 10 kg of solvent B. Solvent A and B are completely immiscible in each other whereas solute C is soluble in both the solvents. The extraction process attains equilibrium. The equilibrium relationship between the two phases is Y* = 0.9X, where Y* is the kg of C/kg of B and X is kg of C/kg of A. Choose the correct answer? |
| A. | The entire amount of C is transferred to solvent B |
| B. | Less than 2 kg but more than 1 kg of C is transferred to solvent B |
| C. | Less than 1 kg of C is transferred to B |
| D. | No amount of C is transferred to B |
| Answer» B. Less than 2 kg but more than 1 kg of C is transferred to solvent B | |
| 364. |
In a gas-liquid absorption column, for obtaining the maximum absorption efficiency____________________? |
| A. | Liquid stream should be distributed uniformly |
| B. | Gas stream should be distributed uniformly |
| C. | Both gas as well as liquid streams should be distributed uniformly |
| D. | By passing should be completely avoided |
| Answer» D. By passing should be completely avoided | |
| 365. |
In a gas-liquid absorption column, for obtaining the maximum absorption efficiency___________________? |
| A. | Liquid stream should be distributed uniformly |
| B. | Gas stream should be distributed uniformly |
| C. | Both gas as well as liquid streams should be distributed uniformly |
| D. | By passing should be completely avoided |
| Answer» D. By passing should be completely avoided | |
| 366. |
In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the________________________? |
| A. | Range is 15°F |
| B. | Approach is 10°F |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 367. |
In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads? Reflux conditions: (i) Reflux stream is completely liquid and is at its bubble point. (ii) Reflux stream is below its bubble point ? |
| A. | Condenser and reboiler loads are the same in both the cases |
| B. | Reboiler load is the same in both the cases but condenser load is higher in case (ii) |
| C. | Condenser load is the same in both the cases but reboiler load is higher in case (ii) |
| D. | Both condenser and reboiler loads are higher in case (ii) as compared to case (i) |
| Answer» E. | |
| 368. |
In a distillation column, with increase in the reflux ratio, the heat removed in the cooler ______________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unaffected |
| D. | And the heat required in reboiler decreases |
| Answer» B. Decreases | |
| 369. |
In a counter-current liquid extractor___________________? |
| A. | Both liquids flow at fixed rate |
| B. | Both liquids can have any desired flow rate |
| C. | Only one of the liquids may be pumped at any desired rate |
| D. | Liquid’s flow rate depends upon the temperature and pressure |
| Answer» D. Liquid’s flow rate depends upon the temperature and pressure | |
| 370. |
In a counter-current extractor, as the axial mixing increases, the extraction efficiency______________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Depends on the pressure of the system |
| Answer» C. Remains unchanged | |
| 371. |
In a binary system, separation is very efficient, when the relative volatility is_______________? |
| A. | 1 |
| B. | > 1 |
| C. | < 1 |
| D. | 0.5 |
| Answer» C. < 1 | |
| 372. |
In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of_________________? |
| A. | 1.5 |
| B. | -0.6 |
| C. | -1.5 |
| D. | 0.6 |
| Answer» D. 0.6 | |
| 373. |
If xD = overhead product molal composition and RD = reflux ratio, then slope and intercept of the operating line for rectifying section are respectively ? |
| A. | [xD/(RD + 1)], [RD/(RD + 1)] |
| B. | [RD/(RD + 1)], [xD/(xD + 1)] |
| C. | [xD/(RD + 1)], [(RD + 1)/RD] |
| D. | None of these |
| Answer» C. [xD/(RD + 1)], [(RD + 1)/RD] | |
| 374. |
If the specific heats of a gas and a vapor are 0.2KJ/Kg.°K and 1.5 KJ/Kg.°K respectively, and the humidity is 0.01; the humid heat in KJ/°Kg. is________________? |
| A. | 0.31 |
| B. | 0.107 |
| C. | 0.017 |
| D. | 0.215 |
| Answer» E. | |
| 375. |
If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that___________________? |
| A. | The system comprises of partially miscible liquids |
| B. | The system comprises of miscible liquids |
| C. | The system comprises of an azeotrope |
| D. | On heating, a vapor phase will appear; while on cooling, a solid phase will appear |
| Answer» E. | |
| 376. |
If the path of liquid across the plate is very long as in case of large diameter tower, Murphree efficiency can be _______________ percent? |
| A. | 100 |
| B. | > 100 |
| C. | < 100 |
| D. | None of these |
| Answer» C. < 100 | |
| 377. |
If the overall efficiency and Murphree plate efficiency are equal, then both the equilibrium and operating lines are_______________? |
| A. | Straight |
| B. | Parallel |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 378. |
If the amount of the steam used in steam distillation is increased, the temperature of distillation__________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Depends on relative volatility |
| Answer» C. Remains unchanged | |
| 379. |
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around _________________ Rm ? |
| A. | 1.2 to 1.5 |
| B. | 2.5 to 3 |
| C. | 3 to 4 |
| D. | 5 |
| Answer» B. 2.5 to 3 | |
| 380. |
If moisture content of solid on dry basis is X, then the same on wet basis is____________________? |
| A. | X/(X + 1) |
| B. | X/(1 – X) |
| C. | (1 + X)/X |
| D. | (1 – X)/X |
| Answer» B. X/(1 – X) | |
| 381. |
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is____________________ |
| A. | 0 |
| B. | 1 |
| C. | < 1 |
| D. | > 1 |
| Answer» C. < 1 | |
| 382. |
If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is___________________? |
| A. | L/G |
| B. | G/L |
| C. | Always < 1 |
| D. | None of these |
| Answer» B. G/L | |
| 383. |
If „f’ is defined as above, then which of the following applies to a feed at dew point ? |
| A. | f = 1 |
| B. | f 1 |
| C. | 0 < f < 1 |
| Answer» B. f 1 | |
| 384. |
If f = moles of vapour present per mole of feed, then the slope of feed line is (McCabe- Thiele method) ________________________? |
| A. | (1 – f)/f |
| B. | – (f – 1)/f |
| C. | -1/f |
| D. | -f/(1 – f) |
| Answer» D. -f/(1 – f) | |
| 385. |
If a1 and a2 are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement ? |
| A. | a1 = a2 |
| B. | a1 = 2a2 |
| C. | a1 = 0.5 a2 |
| D. | None of these |
| Answer» E. | |
| 386. |
If a two phase system is in physical equilibrium; then it means that, the_____________________? |
| A. | Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase |
| B. | Temperature of the liquid phase is equal to that of the vapor phase |
| C. | Total pressure throughout the liquid phase is equal to that throughout the vapor phase |
| D. | All A., B. and C. |
| Answer» E. | |
| 387. |
Hypersorption refers to a ________________ process? |
| A. | Fixed bed absorption |
| B. | Moving bed absorption |
| C. | Fixed bed adsorption |
| D. | Moving bed adsorption |
| Answer» E. | |
| 388. |
Hydrogenation of oil is carried out in a/an _______________ in Vanaspati manufacturing plant? |
| A. | Agitated vessel |
| B. | Sieve tray column |
| C. | Bubble cap column |
| D. | Packed tower |
| Answer» B. Sieve tray column | |
| 389. |
Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of _______________ humidity? |
| A. | Molal |
| B. | Relative |
| C. | Percentage |
| D. | None of these |
| Answer» B. Relative | |
| 390. |
Humid volume is the total volume in m3 of 1 kg of _____________________? |
| A. | Vapour laden gas at 1 atm. and room temperature |
| B. | Gas plus its accompanying vapour at 1 atm. and room temperature |
| C. | Gas plus its accompanying vapour at 1 atm. and gas temperature |
| D. | Vapour laden gas at 1 atm. and gas temperature |
| Answer» D. Vapour laden gas at 1 atm. and gas temperature | |
| 391. |
Humidification involves mass transfer between a pure liquid phase and a fixed gas, which is___________________? |
| A. | Insoluble in the liquid |
| B. | Soluble in the liquid |
| C. | Non-ideal in nature |
| D. | At a fixed temperature |
| Answer» B. Soluble in the liquid | |
| 392. |
Humid volume, at a given temperature is a/an _______________ function of humidity? |
| A. | Inverse |
| B. | Exponential |
| C. | Linear |
| D. | Logarithmic |
| Answer» D. Logarithmic | |
| 393. |
High pressure at the bottom of a distillation tower handling heat sensitive materials results in _____________________? |
| A. | Thermal decomposition of bottoms |
| B. | Increased relative volatility |
| C. | Erosion of the tower |
| D. | Very efficient operation |
| Answer» B. Increased relative volatility | |
| 394. |
High pressure at the bottom of a distillation tower handling heat sensitive materials results in____________________? |
| A. | Thermal decomposition of bottoms |
| B. | Increased relative volatility |
| C. | Erosion of the tower |
| D. | Very efficient operation |
| Answer» B. Increased relative volatility | |
| 395. |
HETP is numerically equal to HTU, only when the operating line ______________________? |
| A. | Lies below the equilibrium line |
| B. | Lies above the equilibrium line |
| C. | And equilibrium lines are parallel |
| D. | Is far from the equilibrium line |
| Answer» D. Is far from the equilibrium line | |
| 396. |
Henry’s law states that the ________________________? |
| A. | Partial pressure of a component over a solution is proportional to its mole fraction in the liquid |
| B. | Partial pressure of a component over a solution is proportional to the mole fraction in the vapour |
| C. | Vapour pressure is equal to the product of the mole fraction and total pressure |
| D. | Partial pressure is equal to the product of the mole fraction and total pressure |
| Answer» B. Partial pressure of a component over a solution is proportional to the mole fraction in the vapour | |
| 397. |
Heat sensitive materials with very high latent heat of vaporisation may be economically separated using__________________? |
| A. | Liquid extraction |
| B. | Distillation |
| C. | Evaporation |
| D. | Absorption |
| Answer» B. Distillation | |
| 398. |
Heat load in a cooling tower______________________? |
| A. | Means the amount of heat thrown away (KCal/hr.) by the cooling tower |
| B. | Is equal to the number of kg, of water circulated times the cooling range |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 399. |
Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1°F is called the________________? |
| A. | Latent heat |
| B. | Humid heat |
| C. | Specific heat |
| D. | Sensible heat |
| Answer» D. Sensible heat | |
| 400. |
H2S present in naphtha reformed gas is removed by absorbing with___________________? |
| A. | Ethanolamine |
| B. | K2CO3 |
| C. | HCl |
| D. | Vacuum gas oil |
| Answer» B. K2CO3 | |