MCQOPTIONS
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MCQOPTIONS
This section includes 469 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
_ Lenz's law results from the law of conservation of$? |
| A. | Mass |
| B. | Momentum |
| C. | Energy |
| D. | None of these |
| Answer» D. None of these | |
| 202. |
_ Specific/molar Gibbs free energy for a pure substance does not change during$? |
| A. | Sublimation |
| B. | Vaporisation |
| C. | Melting |
| D. | Either A, B or C |
| Answer» E. | |
| 203. |
_ __________ does not change during phase transformation processes like sublimation, melting & vaporisation.$? |
| A. | Entropy |
| B. | Gibbs free energy |
| C. | Internal energy |
| D. | All of the above |
| Answer» C. Internal energy | |
| 204. |
_ The adiabatic throttling process of a perfect gas is one of constant enthalpy$? |
| A. | In which there is a temperature drop |
| B. | Which is exemplified by a non-steady flow expansion |
| C. | Which can be performed in a pipe with a constriction |
| D. | In which there is an increase in temperature |
| Answer» D. In which there is an increase in temperature | |
| 205. |
_ The number of degrees of freedom for an azeotropic mixture in a two component vapour-liquid equilibria is/are$? |
| A. | Zero |
| B. | One |
| C. | Two |
| D. | Three |
| Answer» C. Two | |
| 206. |
_ An irreversible process$? |
| A. | Is the analog of linear frictionless motion in machines |
| B. | Is an idealised visualisation of behaviour of a system |
| C. | Yields the maximum amount of work |
| D. | Yields an amount of work less than that of a reversible process |
| Answer» E. | |
| 207. |
_ The number of degrees of freedom for a mixture of ice and water (liquid) are$? |
| A. | 2 |
| B. | 3 |
| C. | 1 |
| D. | 0 |
| Answer» D. 0 | |
| 208. |
_ Gibbs free energy of a pure fluid approaches __________ as the pressure tends to zero at constant temperature.$? |
| A. | Infinity |
| B. | Minus infinity |
| C. | Zero |
| D. | None of these |
| Answer» C. Zero | |
| 209. |
_ If atmospheric temperature and dew point are nearly equal, then the relative humidity is$? |
| A. | Zero |
| B. | 50% |
| C. | Almost 100% |
| D. | Unpredictable |
| Answer» D. Unpredictable | |
| 210. |
_ Extensive properties of a thermodynamic system depend upon the __________ of the system.$? |
| A. | Specific volume |
| B. | Temperature |
| C. | Mass |
| D. | Pressure |
| Answer» D. Pressure | |
| 211. |
_ The second law of thermodynamics states that$? |
| A. | The energy change of a system undergoing any reversible process is zero |
| B. | It is not possible to transfer heat from a lower temperature to a higher temperature |
| C. | The total energy of system and surrounding remains the same |
| D. | None of the above |
| Answer» E. | |
| 212. |
_ Variation of equilibrium pressure with temperature for any two phases of a given substances is given by the __________ equation.$? |
| A. | Gibbs-Duhem |
| B. | Maxwell's |
| C. | Clayperon |
| D. | None of these |
| Answer» D. None of these | |
| 213. |
_ The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called __________ temperature.$? |
| A. | Boyle |
| B. | Inversion |
| C. | Critical |
| D. | Reduced |
| Answer» B. Inversion | |
| 214. |
_ Entropy change of the reaction, H‚ÇÇO(liquid) H‚ÇÇO(gas), is termed as the enthalpy of$? |
| A. | Solution |
| B. | Vaporisation |
| C. | Formation |
| D. | Formation |
| Answer» C. Formation | |
| 215. |
_ At 60° C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60° C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is$? |
| A. | 1.572 |
| B. | 1.9398 |
| C. | 3.389 |
| D. | 4.238 |
| Answer» B. 1.9398 | |
| 216. |
_ In the equation PVn = constant, if the value of n = y = Cp/Cv, then it represents a reversible __________ process.$? |
| A. | Isothermal |
| B. | Adiabatic |
| C. | Isentropic |
| D. | Polytropic |
| Answer» D. Polytropic | |
| 217. |
_ Gibbs-Duhem equation relates composition in liquid phase and the __________ at constant temperature & pressure.$? |
| A. | Fugacity |
| B. | Partial pressure |
| C. | Activity co-efficient |
| D. | A, B, and C |
| Answer» E. | |
| 218. |
_ If an ideal solution is formed by mixing two pure liquids in any proportion, then the __________ of mixing is zero.$? |
| A. | Enthalpy |
| B. | Volume |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 219. |
_ A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is$? |
| A. | Zero |
| B. | Positive |
| C. | Negative |
| D. | None of these |
| Answer» D. None of these | |
| 220. |
_ The unity of Planck's constant 'h' in the equation, E = hv is$? |
| A. | J/s |
| B. | J.S |
| C. | J/kmol |
| D. | Kmol/J |
| Answer» C. J/kmol | |
| 221. |
_ Which of the following is Virial equation of state?$? |
| A. | (p + a/V²)(V - b) = nRT |
| B. | PV = nRT |
| C. | PV = A + B/V + C/V² + D/V³ + … |
| D. | None of the above |
| Answer» D. None of the above | |
| 222. |
_ A refrigeration cycle is the same as a __________ cycle,$? |
| A. | Turbine |
| B. | Heat engine |
| C. | Reversed heat engine |
| D. | None of these |
| Answer» D. None of these | |
| 223. |
_ The expression, nCv(T‚ÇÇ - T‚ÇÅ), is for the __________ of an ideal gas.$? |
| A. | Work done under adiabatic condition |
| B. | Co-efficient of thermal expansion |
| C. | Compressibility |
| D. | None of these |
| Answer» B. Co-efficient of thermal expansion | |
| 224. |
_ Pick out the correct equation relating 'F' and 'A'.$? |
| A. | F = A + PV |
| B. | F = E + A |
| C. | F = A - TS |
| D. | F = A + TS |
| Answer» B. F = E + A | |
| 225. |
_ Fugacity is a measure of the$? |
| A. | Escaping tendencies of the same substance in different phases of a system |
| B. | Relative volatility of a mixture of two miscible liquids |
| C. | Behaviour of ideal gases |
| D. | None of these |
| Answer» B. Relative volatility of a mixture of two miscible liquids | |
| 226. |
_ A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is Φi yi P = Yi xi fi° where, Φ is a vapor fugacity component, Yi is the liquid activity co-efficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of$? |
| A. | Temperature only |
| B. | Temperature and pressure only |
| C. | Temperature, pressure and liquid composition xi only |
| D. | Temperature, pressure, liquid composition xi and vapour composition yi |
| Answer» D. Temperature, pressure, liquid composition xi and vapour composition yi | |
| 227. |
_ For an incompressible fluid, the __________ is a function of both pressure as well as temperature.$? |
| A. | Internal energy |
| B. | Enthalpy |
| C. | Entropy |
| D. | All of the above |
| Answer» C. Entropy | |
| 228. |
_ At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero. This follows from the$? |
| A. | Third law of thermodynamics |
| B. | Second law of thermodynamics |
| C. | Nernst heat theorem |
| D. | Maxwell's relations |
| Answer» B. Second law of thermodynamics | |
| 229. |
_ Which of the following equations is obtained on combining 1st and 2nd law of thermodynamics, for a system of constant mass?$? |
| A. | DE = Tds - PdV |
| B. | DQ = CvdT + PdV |
| C. | DQ = CpdT + Vdp |
| D. | Tds = dE - PdV |
| Answer» B. DQ = CvdT + PdV | |
| 230. |
_ Solubility of a substance which dissolves with an increase in volume and liberation of heat will be favoured by the$? |
| A. | Low pressure and high temperature |
| B. | Low pressure and low temperature |
| C. | High pressure and low temperature |
| D. | High pressure and high temperature |
| Answer» C. High pressure and low temperature | |
| 231. |
_ Measurement of thermodynamic property of temperature is facilitated by __________ law of thermodynamics.$? |
| A. | 1st |
| B. | Zeroth |
| C. | 3rd |
| D. | None of these |
| Answer» C. 3rd | |
| 232. |
_ In case of a close thermodynamic system, there is __________ across the boundaries.$? |
| A. | No heat and mass transfer |
| B. | No mass transfer but heat transfer |
| C. | Mass and energy transfer |
| D. | None of these |
| Answer» C. Mass and energy transfer | |
| 233. |
_ Gibbs phase rule finds application, when heat transfer occurs by$? |
| A. | Conduction |
| B. | Convection |
| C. | Radiation |
| D. | Condensation |
| Answer» E. | |
| 234. |
_ The relation connecting the fugacities of various components in a solution with one another and to composition at constant temperature and pressure is called the __________ equation.$? |
| A. | Gibbs-Duhem |
| B. | Van Laar |
| C. | Gibbs-Helmholtz |
| D. | Margules |
| Answer» B. Van Laar | |
| 235. |
_ The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances. This is the$? |
| A. | Lewis-Randall rule |
| B. | Statement of Vant-Hoff equation |
| C. | Le-Chatelier's principle |
| D. | None of these |
| Answer» E. | |
| 236. |
_ A nozzle is a device, which$? |
| A. | Increases kinetic energy and decreases pressure |
| B. | Reduces kinetic energy and increases pressure |
| C. | Reduces both kinetic energy and pressure |
| D. | Increases both kinetic energy and pressure |
| Answer» B. Reduces kinetic energy and increases pressure | |
| 237. |
_ Trouton's ratio is given by (where λb, = molal heat of vaporisation of a substance at its normal boiling point, kcal/kmol Tb = normal boiling point, °K )$? |
| A. | λb/Tb |
| B. | Tb/λb |
| C. | ‚à ö(Œªb/Tb) |
| D. | ‚à ö(Tb/Œªb) |
| Answer» B. Tb/≈í¬™b | |
| 238. |
_ Domestic refrigerator usually works on the __________ refrigeration cycle.$? |
| A. | Carnot |
| B. | Air |
| C. | Absorption |
| D. | Vapour-ejection |
| Answer» D. Vapour-ejection | |
| 239. |
_ Entropy, which is a measure of the disorder of a system is$? |
| A. | Independent of pressure |
| B. | Independent of temperature |
| C. | Zero at absolute zero temperature for a perfect crystalline substance |
| D. | All of the above |
| Answer» D. All of the above | |
| 240. |
_ Which of the following equations is used for the prediction of activity co-efficient from experiments?$? |
| A. | Van Laar equation |
| B. | Margules equation |
| C. | Wilson's equation |
| D. | All of the above |
| Answer» E. | |
| 241. |
_ In an ideal refrigeration cycle, the change in internal energy of the fluid is$? |
| A. | +ve |
| B. | -ve |
| C. | 0 |
| D. | Either of the above three ; depends on the nature of refrigerant |
| Answer» D. Either of the above three ; depends on the nature of refrigerant | |
| 242. |
_ Which is not constant for an ideal gas?$? |
| A. | (‚à ÇP/‚à ÇV)T |
| B. | (‚à ÇV/‚à ÇT)P |
| C. | (‚à ÇP/‚à ÇV)V |
| D. | All of the above |
| Answer» B. (‚Äö√ √áV/‚Äö√ √áT)P | |
| 243. |
_ Choose the condition that must be specified in order to liquify CO₂ (triple point for CO₂ is - 57°C and 5.2 atm).$? |
| A. | Pressure must be kept below 5.2 atm |
| B. | Temperature must be kept above - 57°C |
| C. | Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C |
| D. | Pressure and temperature must be kept below 5.2 atm. and - 57°C respectively |
| Answer» E. | |
| 244. |
_ A large iceberg melts at the base, but not at the top, because of the reason that$? |
| A. | Ice at the base contains impurities which lowers its melting point |
| B. | Due to the high pressure at the base, its melting point reduces |
| C. | The iceberg remains in a warmer condition at the base |
| D. | All of the above |
| Answer» C. The iceberg remains in a warmer condition at the base | |
| 245. |
_ In Joule-Thomson porous plug experiment, the$? |
| A. | Enthalpy does not remain constant |
| B. | Entire apparatus is exposed to surroundings |
| C. | Temperature remains constant |
| D. | None of these |
| Answer» E. | |
| 246. |
_ When a gas is subjected to adiabatic expansion, it gets cooled due to$? |
| A. | Decrease in velocity |
| B. | Decrease in temperature |
| C. | Decrease in kinetic energy |
| D. | Energy spent in doing work |
| Answer» E. | |
| 247. |
__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 | |
| 248. |
__Gibbs free energy at constant pressure and temperature under equilibrium conditions is__ |
| A. | ‚à û |
| B. | 0 |
| C. | Maximum |
| D. | Minimum |
| Answer» E. | |
| 249. |
__A domestic refrigerator has a/an __________ cooled condenser.__ |
| A. | Water |
| B. | Air |
| C. | Evaporative |
| D. | Gas |
| Answer» C. Evaporative | |
| 250. |
__In polytropic process (PVn = constant), if n = 1; it means a/an __________ process.__ |
| A. | Adiabatic |
| B. | Reversible |
| C. | Isothermal |
| D. | None of these |
| Answer» D. None of these | |