MCQOPTIONS
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MCQOPTIONS
This section includes 456 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. |
During adiabatic expansion of gas___________________? |
| A. | Pressure remains constant |
| B. | Pressure is increased |
| C. | Temperature remains constant |
| D. | None of these |
| Answer» E. | |
| 352. |
During a reversible isothermal expansion of an ideal gas, the entropy change is___________________? |
| A. | +ve |
| B. | 0 |
| C. | -ve |
| D. | ∞ |
| Answer» B. 0 | |
| 353. |
During a reversible isothermal expansion of an ideal gas, the entropy change is_________________? |
| A. | +ve |
| B. | 0 |
| C. | -ve |
| D. | ∞ |
| Answer» B. 0 | |
| 354. |
Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture ______________ calorimeter is not used for measuring the dryness fraction of steam? |
| A. | Bomb |
| B. | Separating |
| C. | Bucket |
| D. | Throttling |
| Answer» B. Separating | |
| 355. |
“Dry ice” is________________? |
| A. | Moisture free ice |
| B. | Solid helium |
| C. | Solid carbon dioxide |
| D. | None of these |
| Answer» D. None of these | |
| 356. |
Domestic refrigerator usually works on the _____________ refrigeration cycle? |
| A. | Carnot |
| B. | Air |
| C. | Absorption |
| D. | vapour-ejection |
| Answer» D. vapour-ejection | |
| 357. |
____________ does not change during phase transformation processes like sublimation, melting & vaporisation? |
| A. | Entropy |
| B. | Gibbs free energy |
| C. | Internal energy |
| D. | All (A), B. & (C) |
| Answer» C. Internal energy | |
| 358. |
Degrees of freedom at triple point will be______________? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 359. |
Degree of freedom of the system ice-water-vapour will be ________________? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 360. |
Degree of freedom of a system consisting of a gaseous mixture of H2 and NH3 will be_________________? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» E. | |
| 361. |
________________ decreases during adiabatic throttling of a perfect gas? |
| A. | Entropy |
| B. | Temperature |
| C. | Enthalpy |
| D. | Pressure |
| Answer» E. | |
| 362. |
Cv is given by__________________? |
| A. | (∂E/∂T)V |
| B. | (∂E/∂V)T |
| C. | (∂E/∂P)V |
| D. | (∂V/∂T)P |
| Answer» B. (∂E/∂V)T | |
| 363. |
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. | |
| 364. |
Critical temperature is defined as the temperature above which a gas will____________________? |
| A. | Not liquify (barring exceptions) |
| B. | Immediately liquify |
| C. | Never liquify however high the pressure may be |
| D. | None of these |
| Answer» D. None of these | |
| 365. |
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 | |
| 366. |
Critical compressibility factor for all substances___________________? |
| A. | Are more or less constant (vary from 0.2 to 0.3) |
| B. | Vary as square of the absolute temperature |
| C. | Vary as square of the absolute pressure |
| D. | None of these |
| Answer» B. Vary as square of the absolute temperature | |
| 367. |
Cp of a gas at its critical temperature and pressure_______________? |
| A. | Becomes zero |
| B. | Becomes infinity |
| C. | Equals 1 kcal/kmol °K |
| D. | Equals 0.24 kcal/kmol °K |
| Answer» C. Equals 1 kcal/kmol °K | |
| 368. |
Cp – Cv = R is valid for ______________ gases? |
| A. | Ideal |
| B. | Very high pressure |
| C. | Very low temperature |
| D. | All of the above |
| Answer» B. Very high pressure | |
| 369. |
COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about____________________? |
| A. | 0.5 |
| B. | 3.5 |
| C. | 4.5 |
| D. | 8.5 |
| Answer» C. 4.5 | |
| 370. |
Consider the reaction, C + O2 ⇌ CO2; ΔH = – 94 kcal. What will be the value of ΔH for the reaction CO2 → C + O2 ? |
| A. | -94 kcal |
| B. | +94 kcal |
| C. | > 94 kcal |
| D. | < -94 kcal |
| Answer» C. > 94 kcal | |
| 371. |
Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates__________________? |
| A. | Use of only one graph for all gases |
| B. | Covering of wide range |
| C. | Easier plotting |
| D. | More accurate plotting |
| Answer» B. Covering of wide range | |
| 372. |
Compressibility factor of a gas is___________________? |
| A. | Not a function of its pressure |
| B. | Not a function of its nature |
| C. | Not a function of its temperature |
| D. | Unity, if it follows PV = nRT |
| Answer» B. Not a function of its nature | |
| 373. |
Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are_______________? |
| A. | Always greater than one |
| B. | Same at the same reduced temperature |
| C. | Same at the same reduced pressure |
| D. | Both B. & C |
| Answer» E. | |
| 374. |
Compressibility factor for almost all the gases are approximately same at the same__________________? |
| A. | Pressure and temperature |
| B. | Reduced pressure and reduced temperature |
| C. | Critical pressure and critical temperature |
| D. | None of these |
| Answer» C. Critical pressure and critical temperature | |
| 375. |
Compound having large heat of formation is_____________________? |
| A. | More stable |
| B. | Less stable |
| C. | Not at all stable (like nascent O2) |
| D. | Either more or less stable; depends on the compound |
| Answer» B. Less stable | |
| 376. |
Co-efficient of performance for a reversed Carnot cycle working between temperatures T1 and T2 (T1 > T2) is ___________________? |
| A. | T2/(T1 – T2) |
| B. | T1/(T1 – T2) |
| C. | (T1 – T2)/T1 |
| D. | (T1 – T2)/T2 |
| Answer» B. T1/(T1 – T2) | |
| 377. |
Co-efficient of Performance (COP) of a refrigerator is the ratio of the ______________________? |
| A. | Work required to refrigeration obtained |
| B. | Refrigeration obtained to the work required |
| C. | Lower to higher temperature |
| D. | Higher to lower temperature |
| Answer» C. Lower to higher temperature | |
| 378. |
Clausius-Clapeyron Equation gives accurate result, when the __________________? |
| A. | Vapour pressure is relatively low and the temperature does not vary over wide limits |
| B. | Vapour obeys the ideal gas law and the latent heat of vaporisation is constant |
| C. | Volume in the liquid state is negligible compared with that in the vapour state |
| D. | All A, B. and C |
| Answer» E. | |
| 379. |
Clausius-Clapeyron equation is applicable to _____________ equilibrium processes? |
| A. | Solid-vapor |
| B. | Solid-liquid |
| C. | Liquid-vapor |
| D. | All A, B. and C |
| Answer» E. | |
| 380. |
Claude’s liquefaction process employs the cooling of gases by__________________? |
| A. | Expansion in an engine |
| B. | Following a constant pressure cycle |
| C. | Throttling |
| D. | None of these |
| Answer» B. Following a constant pressure cycle | |
| 381. |
Claude gas liquefaction process employs cooling___________________? |
| A. | At constant pressure |
| B. | By throttling |
| C. | By expansion in an engine |
| D. | None of these |
| Answer» D. None of these | |
| 382. |
Clapeyron Equation deals with the____________________? |
| A. | Rate of change of vapour pressure with temperature |
| B. | Effect of an inert gas on vapour pressure |
| C. | Calculation of ΔF for spontaneous phase change |
| D. | Temperature dependence of heat of phase transition |
| Answer» B. Effect of an inert gas on vapour pressure | |
| 383. |
Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is – 57°C and 5.2 atm) ? |
| A. | Pressure must be kept below 5.2 atm |
| B. | Temperature must be kept above – 57°C |
| C. | Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C |
| D. | Pressure and temperature must be kept below 5.2 atm. and – 57°C respectively |
| Answer» E. | |
| 384. |
Chemical potential of ith component of a system is given by________________? |
| A. | μi = (∂F/∂ni)T, P, ni |
| B. | μi = (∂A/∂ni)T, P, ni |
| C. | μi = (∂F/∂ni)T, P |
| D. | μi = (∂A/∂ni)T, P |
| Answer» B. μi = (∂A/∂ni)T, P, ni | |
| 385. |
Chemical potential is a/an_____________________? |
| A. | Extensive property |
| B. | Intensive property |
| C. | Force which drives the chemical system to equilibrium |
| D. | Both B. and C |
| Answer» E. | |
| 386. |
Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The ratio of chemical potential to free energy of a pure substance at constant temperature and pressure is________________? |
| A. | 0 |
| B. | 1 |
| C. | ∞ |
| D. | None of these |
| Answer» C. ∞ | |
| 387. |
Chemical engineering thermodynamics is concerned with the ____________ in/of chemical processes? |
| A. | Reaction mechanism |
| B. | Calculation of rates |
| C. | Energy transformation from one form to another |
| D. | None of these |
| Answer» D. None of these | |
| 388. |
Charles’ law for gases states that__________________? |
| A. | V/T = Constant |
| B. | V ∝ 1/T |
| C. | V ∝ 1/P |
| D. | PV/T = Constant |
| Answer» B. V ∝ 1/T | |
| 389. |
Change of state namely evaporation condensation, freezing and melting is an _______________ process? |
| A. | Isothermal |
| B. | Adiabatic |
| C. | Isobaric |
| D. | Isochoric |
| Answer» B. Adiabatic | |
| 390. |
Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the__________________? |
| A. | Calorific value |
| B. | Heat of reaction |
| C. | Heat of combustion |
| D. | Heat of formation |
| Answer» D. Heat of formation | |
| 391. |
_____________ 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. | |
| 392. |
Boyle’s law for gases states that____________________? |
| A. | P ∝ 1/V, when temperature is constant |
| B. | P ∝ 1/V, when temperature & mass of the gas remain constant |
| C. | P ∝ V, at constant temperature & mass of the gas |
| D. | P/V = constant, for any gas |
| Answer» C. P ∝ V, at constant temperature & mass of the gas | |
| 393. |
Boiling of liquid is accompanied with increase in the__________________? |
| A. | Vapor pressure |
| B. | Specific Gibbs free energy |
| C. | Specific entropy |
| D. | All (A), B. and (C) |
| Answer» B. Specific Gibbs free energy | |
| 394. |
At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be________________? |
| A. | More |
| B. | Less |
| C. | Same |
| D. | More or less; depending on the system |
| Answer» D. More or less; depending on the system | |
| 395. |
At the critical point of a substance____________? |
| A. | The surface tension vanishes |
| B. | Liquid and vapour have the same density |
| C. | There is no distinction between liquid and vapour phases |
| D. | All A, B. and C |
| Answer» E. | |
| 396. |
“At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero”. This follows from the __________________? |
| A. | Third law of thermodynamics |
| B. | Second law of thermodynamics |
| C. | Nernst heat theorem |
| D. | Maxwell’s relations |
| Answer» B. Second law of thermodynamics | |
| 397. |
At ____________ point, all the three phases (i.e. solid, liquid and gas) co-exist ? |
| A. | Eutectic |
| B. | Triple |
| C. | Plait |
| D. | Critical |
| Answer» C. Plait | |
| 398. |
At normal boiling point, molar entropy of vaporisation is _____________ Joule/K°.mole? |
| A. | 72 |
| B. | 92 |
| C. | 142 |
| D. | 192 |
| Answer» C. 142 | |
| 399. |
At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by (where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.) ? |
| A. | μ° + RT ln f |
| B. | μ°+ R ln f |
| C. | μ° + T ln f |
| D. | μ° + R/T ln f |
| Answer» B. μ°+ R ln f | |
| 400. |
At constant temperature and pressure, for one mole of a pure substance, the ratio of the free energy to the chemical potential is____________________? |
| A. | Zero |
| B. | One |
| C. | Infinity |
| D. | Negative |
| Answer» C. Infinity | |