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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 2351. |
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. | |
| 2352. |
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 | |
| 2353. |
__________ 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 | |
| 2354. |
Rate of leaching increases with increasing |
| A. | temperature |
| B. | viscosity of solvent |
| C. | pressure |
| D. | size of the solid |
| Answer» B. viscosity of solvent | |
| 2355. |
An azeotropic mixture is a __________ mixture. |
| A. | binary |
| B. | ternary |
| C. | constant boiling point |
| D. | none of these |
| Answer» D. none of these | |
| 2356. |
The Knudsen diffusivity is dependent on the |
| A. | molecular velocity only. |
| B. | pore radius of the catalyst only. |
| C. | molecular mean free path only. |
| D. | molecular velocity and por radius of the catalyst. |
| Answer» E. | |
| 2357. |
The percentage humidity is less than the relative humidity only at __________ percent humidity. |
| A. | zero |
| B. | hundred |
| C. | both zero and hundred |
| D. | none of these |
| Answer» D. none of these | |
| 2358. |
Back-trapping in a distillation column |
| A. | increases tray efficiency. |
| B. | decreases tray efficiency. |
| C. | reduces pressure drop. |
| D. | is desirable, as it provides improved vapour-liquid contact. |
| Answer» C. reduces pressure drop. | |
| 2359. |
Minimum possible diameter of a packed coloumn is decided mainly by the |
| A. | flooding |
| B. | gas viscosity |
| C. | liquid density |
| D. | liquid hold up |
| Answer» B. gas viscosity | |
| 2360. |
Solvent used in extractive distillation |
| A. | is of low volatility. |
| B. | forms a low boiling azeotrope. |
| C. | forms a high boiling azeotrope. |
| D. | does not alter the relative volatility of the original components. |
| Answer» C. forms a high boiling azeotrope. | |
| 2361. |
Capacity of a rotary dryer depends on its |
| A. | r.p.m |
| B. | inclination with ground surface |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 2362. |
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. | |
| 2363. |
The following plot gives the saturated humidity (He) versus temperature (T).Line joining (H1, T1) and (H2, T2) is the constant enthalpy line. Choose the correct one from among the alternatives A, B, C and D. |
| A. | T1-Dew point temp; T2-Dry bulb temp; T3-Wet bulb temp. |
| B. | T1-Dew point temp; T2-Wet bulb temp; T3-Dry bulb temp. |
| C. | T1-Wet bulb temp; T2-Dry bulb temp; T3-Dew point temp. |
| D. | T1-Dry bulb temp; T2-Wet bulb temp; T3-Dew point temp. |
| Answer» E. | |
| 2364. |
Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is __________ the liquid head available in the downcomer. |
| A. | less than |
| B. | more than |
| C. | same as |
| D. | very much less |
| Answer» C. same as | |
| 2365. |
Milk is dried usually in a __________ dryer. |
| A. | freeze |
| B. | spray |
| C. | tray |
| D. | rotary |
| Answer» C. tray | |
| 2366. |
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when |
| A. | extracting solvent is cheaply & abundantly available. |
| B. | one of the liquid components is heat sensitive. |
| C. | viscosity of liquid components is very high. |
| D. | one of the liquid components has very high affinity towards the solvent. |
| Answer» E. | |
| 2367. |
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. | |
| 2368. |
Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in |
| A. | viscosity with concentration. |
| B. | degree of ideality of the solution. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 2369. |
Occurrence of 'case hardening' during drying of a high moisture solid cake __________ the drying rate. |
| A. | increases |
| B. | decreases |
| C. | does not affect |
| D. | exponentially increases |
| Answer» C. does not affect | |
| 2370. |
Which of the following is not a continuous drier ? |
| A. | Drum drier |
| B. | Spray drier |
| C. | Tunnel drier |
| D. | Tray drier |
| Answer» E. | |
| 2371. |
Specific volume of an ideal gas is |
| A. | equal to its density. |
| B. | the reciprocal of its density. |
| C. | proportional to pressure. |
| D. | none of these. |
| Answer» C. proportional to pressure. | |
| 2372. |
Pick out the extensive property out of the following. |
| A. | Surface tension |
| B. | Free energy |
| C. | Specific heat |
| D. | Refractive index |
| Answer» C. Specific heat | |
| 2373. |
A change in state involving a decrease in entropy can be spontaneous, only if |
| A. | it is exothermic. |
| B. | it is isenthalpic. |
| C. | it takes place isothermally. |
| D. | it takes place at constant volume. |
| Answer» B. it is isenthalpic. | |
| 2374. |
Entropy change of the reaction, H2O(liquid) H2O(gas), is termed as the enthalpy of |
| A. | solution |
| B. | vaporisation |
| C. | formation |
| D. | formation |
| Answer» C. formation | |
| 2375. |
Which law of the thermodynamics provids basis for measuring the thermodynamic property ? |
| A. | First law |
| B. | Zeroth law |
| C. | Third law |
| D. | Second law |
| Answer» C. Third law | |
| 2376. |
Gibbs free energy at constant pressure and temperature under equilibrium conditions is |
| A. | |
| B. | 0 |
| C. | maximum |
| D. | minimum |
| Answer» E. | |
| 2377. |
With increase in pressure (above atmospheric pressure), the Cp of a gas |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | first decreases and then increases |
| Answer» B. decreases | |
| 2378. |
Joule-Thomson co-efficient which is defined as, , changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is |
| A. | 0 |
| B. | |
| C. | +ve |
| D. | -ve |
| Answer» B. | |
| 2379. |
__________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low. |
| A. | Bucket |
| B. | Throttling |
| C. | Separating |
| D. | A combination of separating & throttling |
| Answer» E. | |
| 2380. |
What is the number of degree of freedom for a system of two miscible non-reacting species in vapor-liquid equilibrium forming an azeotrope ? |
| A. | 3 |
| B. | 2 |
| C. | 1 |
| D. | 0 |
| Answer» D. 0 | |
| 2381. |
Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which |
| A. | a homogeneous solution (say of phenol water) is formed. |
| B. | mutual solubility of the two liquids shows a decreasing trend. |
| C. | two liquids are completely separated into two layers. |
| D. | none of these. |
| Answer» B. mutual solubility of the two liquids shows a decreasing trend. | |
| 2382. |
Which is not constant for an ideal gas ? |
| A. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/410-278-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/394-49-4.png"> |
| C. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/410-278-3.png"> |
| D. | all (a), (b) & (c) |
| Answer» B. <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/394-49-4.png"> | |
| 2383. |
One ton of refrigeration is defined as the heat rate corresponding to melting of one ton of ice in one |
| A. | hour |
| B. | day |
| C. | minute |
| D. | second |
| Answer» C. minute | |
| 2384. |
__________ functions are exemplified by heat and work. |
| A. | Path |
| B. | Point |
| C. | State |
| D. | none of these |
| Answer» B. Point | |
| 2385. |
In an isothermal process on an ideal gas, the pressure increases by 0.5 percent. The volume decreases by about __________ percent. |
| A. | 0.25 |
| B. | 0.5 |
| C. | 0.75 |
| D. | 1 |
| Answer» C. 0.75 | |
| 2386. |
Partial molal quantities are important in the study of |
| A. | ideal gases |
| B. | ideal solutions |
| C. | non-ideal mixtures |
| D. | a pure component |
| Answer» D. a pure component | |
| 2387. |
Number of degrees of freedom for a three phase system in equilibrium comprising of three non-reacting chemical species is |
| A. | 2 |
| B. | 0 |
| C. | 1 |
| D. | 3 |
| Answer» B. 0 | |
| 2388. |
The equation DU = Tds - PdV is applicable to infinitesimal changes occuring in |
| A. | an open system of constant composition. |
| B. | a closed system of constant composition. |
| C. | an open system with changes in composition. |
| D. | a closed system with changes in composition. |
| Answer» E. | |
| 2389. |
Heat is added at constant temperature in an ideal __________ cycle. |
| A. | Stirling |
| B. | Brayton |
| C. | Rankine |
| D. | none of these |
| Answer» B. Brayton | |
| 2390. |
Cv for an ideal gas |
| A. | does not depend upon temperature. |
| B. | is independent of pressure only. |
| C. | is independent of volume only. |
| D. | is independent of both pressure and volume. |
| Answer» E. | |
| 2391. |
The amount of heat required to decompose a compound into its elements is __________ the heat of formation of that compound from its elements. |
| A. | less than |
| B. | more than |
| C. | same as |
| D. | not related to |
| Answer» D. not related to | |
| 2392. |
In any spontaneous process, the __________ free energy decreases. |
| A. | Helmholtz |
| B. | Gibbs |
| C. | both a & b |
| D. | neither 'a' nor 'b' |
| Answer» D. neither 'a' nor 'b' | |
| 2393. |
The gas law (PV = RT) is true for an __________ change. |
| A. | isothermal |
| B. | adiabatic |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 2394. |
Solar energy results from __________ reaction. |
| A. | fission |
| B. | combustion |
| C. | thermonuclear |
| D. | none of these |
| Answer» D. none of these | |
| 2395. |
The emission of an a-particle causes the resultant nucleus to have |
| A. | more atomic weight and less atomic number. |
| B. | less atomic weight and less atomic number. |
| C. | less atomic weight and more atomic number. |
| D. | none of these. |
| Answer» B. less atomic weight and less atomic number. | |
| 2396. |
In nuclear reactions, __________ number is conserved. |
| A. | mass |
| B. | atomic |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 2397. |
The molecular weight of heavy water is |
| A. | 10 |
| B. | 18 |
| C. | 20 |
| D. | 36 |
| Answer» D. 36 | |
| 2398. |
The phenomenon of nuclear fission is opposite to that of |
| A. | radioactive decay |
| B. | thermionic emission |
| C. | nuclear fusion |
| D. | combustion |
| Answer» D. combustion | |
| 2399. |
An ideal coolant for a nuclear reactor should |
| A. | be a good absorber of neutrons. |
| B. | be capable of attaining high temperature, only when it is pressurised. |
| C. | have high density, but low heat transfer co-efficient. |
| D. | be free from radiation damage and non-corrosive. |
| Answer» E. | |
| 2400. |
The size of an atom is of the order of one |
| A. | Angstrom |
| B. | fermi |
| C. | micron |
| D. | mm |
| Answer» B. fermi | |