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.
| 251. |
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 | |
| 252. |
Ideal gas law is applicable at____________________? |
| A. | Low T, low P |
| B. | High T, high P |
| C. | Low T, high P |
| D. | High T, low P |
| Answer» E. | |
| 253. |
Ideal refrigeration cycle is____________________? |
| A. | Same as Carnot cycle |
| B. | Same as reverse Carnot cycle |
| C. | Dependent on the refrigerant’s properties |
| D. | The least efficient of all refrigeration processes |
| Answer» C. Dependent on the refrigerant’s properties | |
| 254. |
(∂H/∂T)P is the mathematical expression for____________________? |
| A. | CV |
| B. | Entropy change |
| C. | Gibbs free energy |
| D. | None of these |
| Answer» E. | |
| 255. |
High pressure steam is expanded adiabatically and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process ? |
| A. | Δ H = 0 and ΔS = 0 |
| B. | Δ H ≠ 0 and ΔS = 0 |
| C. | Δ H ≠ 0 and ΔS ≠ 0 |
| D. | Δ H = 0 and ΔS ≠ 0 |
| Answer» C. Δ H ≠ 0 and ΔS ≠ 0 | |
| 256. |
High _____________ is an undesirable property for a good refrigerant? |
| A. | Specific heat |
| B. | Latent heat of vaporisation |
| C. | Viscosity |
| D. | Specific vapor volume |
| Answer» D. Specific vapor volume | |
| 257. |
Henry’s law is closely obeyed by a gas, when its _____________ is extremely high? |
| A. | Pressure |
| B. | Solubility |
| C. | Temperature |
| D. | None of these |
| Answer» E. | |
| 258. |
Helmholtz free energy A. is defined as____________________? |
| A. | A = H – TS |
| B. | A = E – TS |
| C. | A = H + TS |
| D. | None of these |
| Answer» C. A = H + TS | |
| 259. |
Heating of water under atmospheric pressure is an ______________ process? |
| A. | Isochoric |
| B. | Isobaric |
| C. | Adiabatic |
| D. | Isothermal |
| Answer» C. Adiabatic | |
| 260. |
Heat requirement for decomposition of a compound into its elements is _____________ that is evolved during the formation of that compound from its elements? |
| A. | The same |
| B. | Less than |
| C. | Greater than |
| D. | Different than |
| Answer» B. Less than | |
| 261. |
Heat pump_______________________? |
| A. | Accomplishes only space heating in winter |
| B. | Accomplishes only space cooling in summer |
| C. | Accomplishes both A. and B |
| D. | Works on Carnot cycle |
| Answer» D. Works on Carnot cycle | |
| 262. |
Heat of reaction at constant volume is identified with _____________ change? |
| A. | Enthalpy |
| B. | Internal energy |
| C. | Either A. or B |
| D. | Neither A. nor B |
| Answer» C. Either A. or B | |
| 263. |
Heat of formation of an element in its standard state is___________________? |
| A. | 0 |
| B. | < 0 |
| C. | > 0 |
| D. | A function of pressure |
| Answer» B. < 0 | |
| 264. |
Heat is added at constant temperature in an ideal ______________ cycle? |
| A. | Stirling |
| B. | Brayton |
| C. | Rankine |
| D. | None of these |
| Answer» B. Brayton | |
| 265. |
Heat is added at constant pressure in an ideal _____________ cycle? |
| A. | Stirling |
| B. | Brayton |
| C. | Rankine |
| D. | Both B. and C |
| Answer» E. | |
| 266. |
Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of______________? |
| A. | Fusion |
| B. | Vaporisation |
| C. | Transition |
| D. | None of these |
| Answer» D. None of these | |
| 267. |
Grams of butane (C4H10) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be__________________? |
| A. | 580 |
| B. | 640 |
| C. | 1160 |
| D. | Data insufficient; can’t be computed |
| Answer» D. Data insufficient; can’t be computed | |
| 268. |
Gibbs phase rule finds application, when heat transfer occurs by___________________? |
| A. | Conduction |
| B. | Convection |
| C. | Radiation |
| D. | Condensation |
| Answer» E. | |
| 269. |
Gibbs free energy per mole for a pure substance is equal to the__________________? |
| A. | Latent heat of vaporisation |
| B. | Chemical potential |
| C. | Molal boiling point |
| D. | Heat capacity |
| Answer» C. Molal boiling point | |
| 270. |
Gibbs-Helmholtz equation is__________________? |
| A. | ΔF = ΔH + T [∂(ΔF)/∂T]P |
| B. | ΔF = ΔH – TΔT |
| C. | d(E – TS) T, V < 0 |
| D. | dP/dT = ΔHvap/T.ΔVvap |
| Answer» B. ΔF = ΔH – TΔT | |
| 271. |
Gibbs free energy of mixing at constant pressure and temperature is always__________________? |
| A. | 0 |
| B. | ∞ |
| C. | + ve |
| D. | – ve |
| Answer» E. | |
| 272. |
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 | |
| 273. |
Gibbs free energy (G) is represented by, G = H – TS, whereas Helmholtz free energy, A. is given by, A = E – TS. Which of the following is the Gibbs-Helmholtz equation ? |
| A. | [∂(G/T)/∂T] = – (H/T2) |
| B. | [∂(A/T)/∂T]V = – E/T2 |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 274. |
Gibbs free energy (F) is defined as__________________? |
| A. | F = E – TS |
| B. | F = H – TS |
| C. | F = H + TS |
| D. | F = E + TS |
| Answer» C. F = H + TS | |
| 275. |
Gibbs free energy at constant pressure and temperature under equilibrium conditions is___________________? |
| A. | ∞ |
| B. | 0 |
| C. | Maximum |
| D. | Minimum |
| Answer» E. | |
| 276. |
Gibbs-Duhem equation_____________________? |
| A. | States that n1dμ1 + n2dμ2 + ….njdμj = 0, for a system of definite composition at constant temperature and pressure |
| B. | Applies only to binary systems |
| C. | Finds no application in gas-liquid equilibria involved in distillation |
| D. | None of these |
| Answer» B. Applies only to binary systems | |
| 277. |
Gibbs-Duhem equation relates composition in liquid phase and the _____________ at constant temperature & pressure? |
| A. | Fugacity |
| B. | Partial pressure |
| C. | Activity co-efficient |
| D. | All (A), (B), and (C) |
| Answer» E. | |
| 278. |
Generation of heat by friction is an example of a/an ________________ change? |
| A. | Isothermal |
| B. | Irreversible |
| C. | Adiabatic |
| D. | Reversible |
| Answer» C. Adiabatic | |
| 279. |
Gases are cooled in Joule-Thomson expansion, when it is _____________ inversion temperature? |
| A. | Below |
| B. | At |
| C. | Above |
| D. | Either B. or C. |
| Answer» B. At | |
| 280. |
Fundamental principle of refrigeration is based on the ______________ law of thermodynamics? |
| A. | Zeroth |
| B. | First |
| C. | Second |
| D. | Third |
| Answer» D. Third | |
| 281. |
_______________ functions are exemplified by heat and work ? |
| A. | Path |
| B. | Point |
| C. | State |
| D. | None of these |
| Answer» B. Point | |
| 282. |
Fugacity of a component in an ideal gas mixture is equal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at constant pressure and temperature ____________ as its mole fraction increases? |
| A. | Decreases |
| B. | Decreases exponentially |
| C. | Increases |
| D. | Remain constant |
| Answer» D. Remain constant | |
| 283. |
Fugacity is most helpful in____________________? |
| A. | Representing actual behaviour of real gases |
| B. | Representing actual behaviour of ideal gases |
| C. | The study of chemical equilibria involving gases at atmospheric pressure |
| D. | None of these |
| Answer» B. Representing actual behaviour of ideal gases | |
| 284. |
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 | |
| 285. |
Fugacity co-efficient of a substance is the ratio of its fugacity to__________________? |
| A. | Mole fraction |
| B. | Activity |
| C. | Pressure |
| D. | Activity co-efficient |
| Answer» D. Activity co-efficient | |
| 286. |
Fugacity and pressure are numerically equal, when the gas is____________________? |
| A. | In standard state |
| B. | At high pressure |
| C. | At low temperature |
| D. | In ideal state |
| Answer» E. | |
| 287. |
Fugacity and pressure are numerically not equal for the gases__________________? |
| A. | At low temperature and high pressure |
| B. | At standard state |
| C. | Both A. and B |
| D. | In ideal state |
| Answer» D. In ideal state | |
| 288. |
Free energy___________________? |
| A. | Decreases in all spontaneous (or irreversible) processes |
| B. | Change during a spontaneous process has a negative value |
| C. | Remains unchanged in reversible processes carried at constant temperature and pressure |
| D. | All A, B. and C |
| Answer» E. | |
| 289. |
Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure ______________ with the increase of reduced temperature? |
| A. | Decreases |
| B. | Increases |
| C. | Remains constant |
| D. | Decreases logarithmically |
| Answer» C. Remains constant | |
| 290. |
Free energy change of mixing two liquid substances is a function of the__________________? |
| A. | Concentration of the constituents only |
| B. | Quantities of the constituents only |
| C. | Temperature only |
| D. | All A, B. and C |
| Answer» E. | |
| 291. |
Free energy change at equilibrium is____________________? |
| A. | Zero |
| B. | Positive |
| C. | Negative |
| D. | Indeterminate |
| Answer» B. Positive | |
| 292. |
Forward reaction will be favoured for the exothermic reaction, represented by CO + H2O ⇌ CO2 + H2, by_________________? |
| A. | Low temperature and high pressure |
| B. | Low temperature and low pressure |
| C. | High temperature and high pressure |
| D. | High temperature and low pressure |
| Answer» B. Low temperature and low pressure | |
| 293. |
For water at 300°C, it has a vapour pressure 8592.7 kPa and fugacity 6738.9 kPa Under these conditions, one mole of water in liquid phase has a volume of 25.28 cm3 and that in vapour phase in 391.1 cm3.Fugacity of water (in kPa) at 9000 kPa will be__________________? |
| A. | 6738.9 |
| B. | 6753.5 |
| C. | 7058.3 |
| D. | 9000 |
| Answer» C. 7058.3 | |
| 294. |
For the reversible exothermic reaction, N2 + 3H2 ⇌ 2NH3, increase of pressure would________________? |
| A. | Shift the equilibrium towards right |
| B. | Give higher yield of NH3 |
| C. | Both B. and C |
| D. | Neither A. nor B |
| Answer» D. Neither A. nor B | |
| 295. |
For the gaseous phase chemical reaction, C2H4(g) + H2O(g) ↔ C2H5OH(g), the equilibrium conversion does not depend on the________________? |
| A. | Steam to ethylene ratio |
| B. | Temperature |
| C. | Pressure |
| D. | None of these |
| Answer» E. | |
| 296. |
For spontaneous changes in an isolated system (S = entropy) ___________________? |
| A. | ds = 0 |
| B. | ds <0 |
| C. | ds > 0 |
| D. | ds = Constant |
| Answer» D. ds = Constant | |
| 297. |
For organic compounds, group contribution method can be used for the estimation of _____________________? |
| A. | Critical properties |
| B. | Specific gravity |
| C. | Specific volume |
| D. | Thermal conductivity |
| Answer» B. Specific gravity | |
| 298. |
For multi-component multiple phases to be in equilibrium at the same pressure and temperature, the _______________ of each component must be same in all phases? |
| A. | Chemical potential |
| B. | Fugacity |
| C. | Both A. and B |
| D. | Neither A. nor B |
| Answer» D. Neither A. nor B | |
| 299. |
For equilibrium process (i.e. reversible) in an isolated system __________________? |
| A. | ds = 0 |
| B. | ds 0 |
| C. | ds = Constant |
| Answer» B. ds 0 | |
| 300. |
For any system, what is the minimum number of degrees of freedom ? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |