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.
| 151. |
The diffusivity, DAB (for component A diffusing in B) is equal to the diffusivity DBA (for component B diffusing in A) for a binary mixture of________________? |
| A. | Newtonian liquids |
| B. | Non-Newtonian liquids |
| C. | Ideal gases |
| D. | Real gases |
| Answer» D. Real gases | |
| 152. |
The diffusivity D. in a binary gas mixture is related to the temperature (T) as________________________? |
| A. | D ∝ T |
| B. | D ∝ T0.5 |
| C. | D ∝ T1.5 |
| D. | D ∝ T2 |
| Answer» D. D ∝ T2 | |
| 153. |
The diffusivity D. in a binary gas mixture is related to the pressure (P) as__________________? |
| A. | D ∝ P0.5 |
| B. | D ∝ 1/P0.5 |
| C. | D ∝ 1/P |
| D. | D ∝ 1/P1.5 |
| Answer» D. D ∝ 1/P1.5 | |
| 154. |
The diffusivity D. in a binary gas mixture is related to the pressure (P) as___________________? |
| A. | D ∝ P0.5 |
| B. | D ∝ 1/P0.5 |
| C. | D ∝ 1/P |
| D. | D ∝ 1/P1.5 |
| Answer» D. D ∝ 1/P1.5 | |
| 155. |
The diffusion co-efficient in m2/s. of acetic acid in benzene (liquid in liquid) is___________________? |
| A. | 2.09 × 10-4 |
| B. | 2.09 × 10-5 |
| C. | 2.09 × 10-9 |
| D. | 2.09 × 10-12 |
| Answer» B. 2.09 × 10-5 | |
| 156. |
The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is___________________? |
| A. | +ve |
| B. | -ve |
| C. | Zero |
| D. | None of these |
| Answer» B. -ve | |
| 157. |
The dew point of an unsaturated gas-vapor mixture does not depend upon the ____________________ of the mixture? |
| A. | Composition |
| B. | Temperature |
| C. | Total pressure |
| D. | All A., B. and C. |
| Answer» C. Total pressure | |
| 158. |
The dew point of an unsaturated gas-vapor mixture does not depend upon the _________________ of the mixture? |
| A. | Composition |
| B. | Temperature |
| C. | Total pressure |
| D. | All A, B. and C. |
| Answer» C. Total pressure | |
| 159. |
The dew point of a saturated gas phase equals the ________________ temperature? |
| A. | Gas |
| B. | Room |
| C. | Wet bulb |
| D. | None of these |
| Answer» B. Room | |
| 160. |
The critical moisture content in case of drying indicates the _______________ rate period? |
| A. | Beginning of falling |
| B. | Beginning of constant |
| C. | End of falling |
| D. | None of these |
| Answer» B. Beginning of constant | |
| 161. |
The critical moisture content in case of drying indicates the ________________ rate period? |
| A. | Beginning of falling |
| B. | Beginning of constant |
| C. | End of falling |
| D. | None of these |
| Answer» B. Beginning of constant | |
| 162. |
The cooling effect in a cooling tower can be speeded up by _______________________? |
| A. | Increasing the air velocity and area of exposed wet surface |
| B. | Reducing the barometric pressure |
| C. | Reducing the humidity of the air |
| D. | All A., B. and C. |
| Answer» E. | |
| 163. |
The cooling effect in a cooling tower cannot be increased by_____________________? |
| A. | Increasing the air velocity over the wet surfaces |
| B. | Reducing the humidity of entering air |
| C. | Lowering the barometric pressure |
| D. | None of these |
| Answer» E. | |
| 164. |
The commonly used solvent in supercritical extraction is_____________________? |
| A. | Methyl ethyl ketone |
| B. | Water |
| C. | Carbon tetrachloride |
| D. | Carbon dioxide |
| Answer» E. | |
| 165. |
The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or “outgassed” adsorbent to from a definite concentration of adsorbate is called its_____________________? |
| A. | Integral heat of adsorption |
| B. | Heat of wetting |
| C. | Differential heat of adsorption |
| D. | Heat of normal condensation |
| Answer» B. Heat of wetting | |
| 166. |
The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the_________________? |
| A. | Differential heat of adsorption |
| B. | Heat of wetting |
| C. | Integral heat of adsorption |
| D. | None of these |
| Answer» B. Heat of wetting | |
| 167. |
The caking of crystals can be prevented by _____________________? |
| A. | Maintaining high critical humidity |
| B. | Maintaining low critical humidity |
| C. | Coating the product with inert material |
| D. | Both A. and C. |
| Answer» E. | |
| 168. |
The boiling points of pure components of a binary system ________________ with increase in total pressure of the system ? |
| A. | Decreases |
| B. | Increases |
| C. | Remains unchanged |
| D. | May increase or decrease, depends on the system |
| Answer» C. Remains unchanged | |
| 169. |
The binary diffusivity in gases does not depend upon the ___________________? |
| A. | Pressure |
| B. | Temperature |
| C. | Nature of the components |
| D. | None of these |
| Answer» E. | |
| 170. |
The binary diffusivity in gases at atmospheric conditions is about ___________________? |
| A. | 10-9 cm/sec |
| B. | 10-1 cm2/sec |
| C. | 10-3 sec/cm |
| D. | 10-4 cm2/sec2 |
| Answer» C. 10-3 sec/cm | |
| 171. |
The binary diffusivity in gases and liquids vary respectively as_________________? |
| A. | T3/2 and T |
| B. | T and T3/2 |
| C. | √T and T3/2 |
| D. | T3/2 and √T |
| Answer» B. T and T3/2 | |
| 172. |
The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are __________________? |
| A. | Parallel |
| B. | Straight |
| C. | Both parallel and straight |
| D. | Neither parallel nor straight |
| Answer» D. Neither parallel nor straight | |
| 173. |
The apex of an equilateral-triangular coordinate (in ternary liquid system) represents a/an ___________________? |
| A. | Pure component |
| B. | Binary mixture |
| C. | Ternary mixture |
| D. | Insoluble binary system |
| Answer» B. Binary mixture | |
| 174. |
The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by __________________? |
| A. | Raising the temperature |
| B. | Lowering the total pressure |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 175. |
The adiabatic saturation curve for a vapour-gas mixture is__________________? |
| A. | Straight line |
| B. | Slightly concave upward |
| C. | Slightly concave downward |
| D. | None of these |
| Answer» C. Slightly concave downward | |
| 176. |
The absorption factor is defined as (where, L = liquid flow rate, G = gas flow rate and, m = slope of the equilibrium line) ? |
| A. | L/mG |
| B. | G/mL |
| C. | mL/G |
| D. | LG/m |
| Answer» B. G/mL | |
| 177. |
Schmidt number is given by ___________________? |
| A. | μ/ρDAB |
| B. | Re × Pe |
| C. | Sh × Pe |
| D. | Re/Pe |
| Answer» B. Re × Pe | |
| 178. |
Schmidt number and Lewis number for pure air at atmospheric conditions are respectively__________________? |
| A. | < 1 and ≈ 1 |
| B. | 1 and 0 |
| C. | > 1 and ≈ 1 |
| D. | 0 and ≈ 1 |
| Answer» B. 1 and 0 | |
| 179. |
Sand is dried in foundries in a ______________________drier? |
| A. | Rotary |
| B. | Fluidised bed |
| C. | Vacuum |
| D. | Spray |
| Answer» C. Vacuum | |
| 180. |
Rotary dryers cannot handle _______________ materials ? |
| A. | Free flowing |
| B. | Dry |
| C. | Sticky |
| D. | Granular |
| Answer» D. Granular | |
| 181. |
Rose oil is extracted from rose leaves using ____________ distillation? |
| A. | High pressure |
| B. | Low pressure |
| C. | Extractive |
| D. | Steam |
| Answer» E. | |
| 182. |
Reverse osmosis is also called_________________? |
| A. | Dialysis |
| B. | Electrodialysis |
| C. | Diffusion |
| D. | Ultra-filtration |
| Answer» E. | |
| 183. |
Removal of ______________ exemplifies an adsorption unit operation? |
| A. | Uranium from its ore |
| B. | Water from petrol |
| C. | Ammonia from coke oven gas |
| D. | Mustard oil from mustard seed |
| Answer» C. Ammonia from coke oven gas | |
| 184. |
Relative volatility varies with the concentration of component for an ideal solution. The relative volatility of a binary mixture may be defined as the ratio of vapor pressure of component ‘A’ to that of component ‘B’, when_________________? |
| A. | Only vapor phase follows Raoult’s law |
| B. | Only liquid phase obeys Dalton’s law |
| C. | Liquid phase obeys Dalton’s law and vapor phase obeys Raoult’s law |
| D. | Vapor phase obeys Dalton’s law and liquid phase obeys Raoult’s law |
| Answer» E. | |
| 185. |
Relative volatility does not change appreciably with the change in_____________________? |
| A. | Temperature |
| B. | Vapour pressure of either component |
| C. | Total pressure |
| D. | None of these |
| Answer» B. Vapour pressure of either component | |
| 186. |
Relative humidity is the ratio of the______________________? |
| A. | Partial pressure of the vapour to the vapour pressure of the liquid at room temperature |
| B. | Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature |
| C. | Actual humidity to saturation humidity |
| D. | None of these |
| Answer» C. Actual humidity to saturation humidity | |
| 187. |
Refractory bricks are usually dried in a ________________ dryer? |
| A. | Tray |
| B. | Tunnel |
| C. | Conveyor |
| D. | Festoon |
| Answer» C. Conveyor | |
| 188. |
Reboiler is considered as one theoretical plate, because_____________________? |
| A. | Of the assumption that vapour and liquid leaving the reboiler are in equilibrium |
| B. | Vapour is recycled to the column |
| C. | Reboiler itself contains one plate |
| D. | None of these |
| Answer» B. Vapour is recycled to the column | |
| 189. |
Rayleigh equation applies to _________________ distillation ? |
| A. | Differential |
| B. | Flash |
| C. | Equilibrium |
| D. | Molecular |
| Answer» B. Flash | |
| 190. |
Rayleigh’s equation applies to _________________ distillation? |
| A. | Continuous |
| B. | Steam |
| C. | Differential |
| D. | Flash |
| Answer» D. Flash | |
| 191. |
Rayleigh’s equation applies to ________________ distillation? |
| A. | Continuous |
| B. | Steam |
| C. | Differential |
| D. | Flash |
| Answer» D. Flash | |
| 192. |
Rate of leaching increases with increasing______________________? |
| A. | Temperature |
| B. | Viscosity of solvent |
| C. | Pressure |
| D. | Size of the solid |
| Answer» B. Viscosity of solvent | |
| 193. |
Raschig ring made of porcelain cannot be used for treating concentrated___________________? |
| A. | Hydrochloric acid |
| B. | Nitric acid |
| C. | Alkalis |
| D. | Sulphuric acid |
| Answer» D. Sulphuric acid | |
| 194. |
Raoult’s law is applicable to the_____________________? |
| A. | Ideal solutions |
| B. | Real solutions |
| C. | Mixture of water and alcohol |
| D. | Non-ideal gases |
| Answer» B. Real solutions | |
| 195. |
Raoult’s law does not apply, when the___________________? |
| A. | Size of component molecules are not equal |
| B. | Attractive forces between like and unlike molecules in the solution are approximately equal |
| C. | Component molecules are non-polar |
| D. | Chemical combination or molecular association between unlike molecules takes place in the formation of solution |
| Answer» D. Chemical combination or molecular association between unlike molecules takes place in the formation of solution | |
| 196. |
Raoult’s law applies to the___________________? |
| A. | All liquid solutions |
| B. | Non-ideal solution only |
| C. | Non-volatile solute |
| D. | Solvents |
| Answer» E. | |
| 197. |
Radioactive nuclear waste is treated in____________________? |
| A. | Mixer-settler extractor |
| B. | Rotating-disc contactor |
| C. | Pulsed column extractor |
| D. | Bollman extractor |
| Answer» D. Bollman extractor | |
| 198. |
Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the ________________ of a fibre ? |
| A. | Electrical resistance |
| B. | Thermal conductivity |
| C. | Strength |
| D. | None of these |
| Answer» B. Thermal conductivity | |
| 199. |
Priming in a distillation column_________________? |
| A. | Results from very low gas velocity |
| B. | Is desirable from point efficiency consideration |
| C. | Is characterised by the presence of foam throughout the space between trays |
| D. | Reduces the overall pressure drop |
| Answer» D. Reduces the overall pressure drop | |
| 200. |
Pressure drop through plate tower as compared to that through packed tower, for the same duty will be___________________? |
| A. | Less |
| B. | More |
| C. | Equal |
| D. | Either A. or B.; depends on the packing height |
| Answer» C. Equal | |