MCQOPTIONS
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MCQOPTIONS
This section includes 58 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If the Standard Gibb's free energy, ΔG°, for a reaction is positive then |
| A. | the products will be favored |
| B. | the reactants will be favored |
| C. | the concentration of the reactants and products will be equal |
| D. | all of the reactant will be converted to product |
| Answer» C. the concentration of the reactants and products will be equal | |
| 2. |
The Standard Gibb's free energy, ΔG°, is |
| A. | the residual energy present in the reactants at equilibrium |
| B. | the residual energy present in the products at equilibrium |
| C. | the difference in the residual energy of reactants and products at equilibrium |
| D. | the energy required to convert one mole of reactants to one mole of products |
| Answer» E. | |
| 3. |
______ states that “pressure of a gas mixture is equal to the sum of the pressures each gas would exert if it existed alone at the mixture temperature and volume”. |
| A. | Amagat's law of additive volumes |
| B. | Hooke’s law |
| C. | Dalton's law of additive pressures |
| D. | Ideal gas law |
| Answer» D. Ideal gas law | |
| 4. |
Maxwell's thermodynamic relations are valid for |
| A. | Closed system only |
| B. | All processes of thermodynamics |
| C. | Only reversible process |
| D. | A thermodynamic system in equilibrium |
| Answer» E. | |
| 5. |
\({\left( {\frac{{\partial p}}{{\partial V}}} \right)_T}{\left( {\frac{{\partial V}}{{\partial T}}} \right)_p}{\left( {\frac{{\partial T}}{{\partial p}}} \right)_V}\) is equal to |
| A. | zero |
| B. | 1 |
| C. | -1 |
| D. | Infinity |
| Answer» D. Infinity | |
| 6. |
Joule-Thompson coefficient for an ideal gas is |
| A. | Higher than zero |
| B. | Less than zero |
| C. | Zero |
| D. | 1 |
| Answer» D. 1 | |
| 7. |
For a pure substance at its triple point, the number of degrees of freedom is |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | None of these |
| Answer» B. 1 | |
| 8. |
On a hot day at Chennai, an oil tanker was loaded with 40000 liters of diesel fuel. The tanker was then driven to Ooty where the temperature was 20 K lower than in Chennai and the entire load was delivered at Ooty. If the coefficient of volume expansion for diesel fuel is 1 × 10-3 /K, the quantity of diesel delivered at Ooty was |
| A. | 40000 Litres |
| B. | 39000 litres |
| C. | 40800 litres |
| D. | 39200 litres |
| Answer» E. | |
| 9. |
Consider the following statements pertaining to Clapeyron equation:1. It is useful in estimating properties like enthalpy from other measurable properties2. At a change of phase, it can be used to find the latent heat at a given pressure3. It is derived from the relationship\({\left( {\frac{{\partial p}}{{\partial v}}} \right)_T} = {\left( {\frac{{\partial s}}{{\partial T}}} \right)_v}\)Which of the above statements are correct? |
| A. | 1 and 3 only |
| B. | 2 and 3 only |
| C. | 1 and 2 only |
| D. | 1, 2 and 3 |
| Answer» D. 1, 2 and 3 | |
| 10. |
Most of the gases exhibit drop in temperature upon expansion. However, this may not be true in case of |
| A. | carbon dioxide |
| B. | oxygen |
| C. | nitrogen |
| D. | helium |
| Answer» E. | |
| 11. |
For a perfect gas match list-I with list-II: List A List BAIsobaric thermal expansion coefficient10BIsothermal compressibility2∞ CIsentropic compressibility31/vDJoule-Thomson coefficient41/T 51/p 61/γp |
| A. | A-4, B-3, C-2, D-1 |
| B. | A-1, B-2, C-4, D-6 |
| C. | A-4, B-5, C-6, D-1 |
| D. | A-3, B-4, C-6, D-5 |
| Answer» D. A-3, B-4, C-6, D-5 | |
| 12. |
The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of |
| A. | T |
| B. | T and P |
| C. | T, P and Z |
| D. | T and Z |
| Answer» C. T, P and Z | |
| 13. |
The molar excess Gibbs free energy, g E , for a binary liquid mixture at T and P is given by, (g E /RT) = A . x1. x2, where A is a constant. The corresponding equation for ln y1, where y1 is the activity co-efficient of component 1, is |
| A. | A . x2 2 |
| B. | Ax1 |
| C. | Ax2 |
| D. | Ax1 2 |
| Answer» B. Ax1 | |
| 14. |
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 | |
| 15. |
For an isothermal process, the internal energy of a gas |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Data insufficient, cant be predicted |
| Answer» D. Data insufficient, cant be predicted | |
| 16. |
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 | |
| 17. |
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. | |
| 18. |
The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition |
| A. | Internal energy |
| B. | Enthalpy |
| C. | Gibbs free energy |
| D. | Helmholtz free energy |
| Answer» D. Helmholtz free energy | |
| 19. |
Work done in case of free expansion is |
| A. | Indeterminate |
| B. | Zero |
| C. | Negative |
| D. | None of these |
| Answer» C. Negative | |
| 20. |
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. | |
| 21. |
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. | |
| 22. |
The compressibility factor for an ideal gas is 1. Its value for any other real gas is |
| A. | 1 |
| B. | < 1 |
| C. | > 1 |
| D. | Either (B) or (C), depends on the nature of the gas |
| Answer» E. | |
| 23. |
A solid is transformed into vapour without going to the liquid phase at |
| A. | Triple point |
| B. | Boiling point |
| C. | Below triple point |
| D. | Always |
| Answer» B. Boiling point | |
| 24. |
An isolated system can exchange __________ with its surroundings. |
| A. | Matter |
| B. | Energy |
| C. | Neither matter nor energy |
| D. | Both matter and energy |
| Answer» D. Both matter and energy | |
| 25. |
A Carnot cycle consists of the following steps: |
| A. | Two isothermal and two isentropic |
| B. | Two isobaric and two isothermal |
| C. | Two isochoric and two isobaric |
| D. | Two isothermals and two isochoric |
| Answer» B. Two isobaric and two isothermal | |
| 26. |
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 | |
| 27. |
"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-Chateliers principle |
| D. | None of these |
| Answer» E. | |
| 28. |
"When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change." This is called the |
| A. | Le-Chatelier principle |
| B. | Kopps rule |
| C. | Law of corresponding state |
| D. | Arrhenius hypothesis |
| Answer» B. Kopps rule | |
| 29. |
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 | |
| 30. |
__________ explains the equilibrium constant for any chemical reaction. |
| A. | Henrys law |
| B. | Law of mass action |
| C. | Hesss law |
| D. | None of these |
| Answer» C. Hesss law | |
| 31. |
The shape of T-S diagram for Carnot Cycle is a |
| A. | Rectangle |
| B. | Rhombus |
| C. | Trapezoid |
| D. | Circle |
| Answer» B. Rhombus | |
| 32. |
Entropy change for an irreversible process taking system and surrounding together is |
| A. | 0 |
| B. | > 0 |
| C. | < 0 |
| D. | None of these |
| Answer» C. < 0 | |
| 33. |
Trouton's ratio of __________ liquids is calculated using Kistyakowsky equation. |
| A. | Polar |
| B. | Non-polar |
| C. | Both (A) & (B) |
| D. | Neither (A) nor (B) |
| Answer» C. Both (A) & (B) | |
| 34. |
Third law of thermodynamics is helpful in |
| A. | Prediction of the extent of a chemical reaction |
| B. | Calculating absolute entropies of substances at different temperature |
| C. | Evaluating entropy changes of chemical reaction |
| D. | Both (B) and (C) |
| Answer» E. | |
| 35. |
One mole of nitrogen at 8 bar and 600 K is contained in a piston-cylinder arrangement. It is brought to 1 bar isothermally against a resisting pressure of 1 bar. The work done (in Joules) by the gas is |
| A. | 30554 |
| B. | 10373 |
| C. | 4988.4 |
| D. | 4364.9 |
| Answer» C. 4988.4 | |
| 36. |
The internal energy of an ideal gas is a function of its __________ only. |
| A. | Molecular size |
| B. | Volume |
| C. | Pressure |
| D. | Temperature |
| Answer» E. | |
| 37. |
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. ∞ | |
| 38. |
“The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture". This is |
| A. | The statement as per Gibbs-Helmholtz |
| B. | Called Lewis-Randall rule |
| C. | Henrys law |
| D. | None of these |
| Answer» C. Henrys law | |
| 39. |
A cyclic engine exchanges heat with two reservoirs maintained at 100 and 300°C respectively. The maximum work (in J) that can be obtained from 1000 J of heat extracted from the hot reservoir is |
| A. | 349 |
| B. | 651 |
| C. | 667 |
| D. | 1000 |
| Answer» B. 651 | |
| 40. |
If two gases have same reduced temperature and reduced pressure, then they will have the same |
| A. | Volume |
| B. | Mass |
| C. | Critical temperature |
| D. | None of these |
| Answer» E. | |
| 41. |
A gas mixture of three components is brought in contact with a dispersion of an organic phase in water. The degree of freedom of the system is |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» B. 4 | |
| 42. |
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 | |
| 43. |
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. | |
| 44. |
There is a change in __________ during the phase transition. |
| A. | Volume |
| B. | Pressure |
| C. | Temperature |
| D. | All a, b & c |
| Answer» B. Pressure | |
| 45. |
A refrigerator works on the principle of __________ law of thermodynamics |
| A. | Zeroth |
| B. | First |
| C. | Second |
| D. | Third |
| Answer» D. Third | |
| 46. |
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 (A), (B) & (C) |
| Answer» D. All (A), (B) & (C) | |
| 47. |
The equation relating E, P, V and T which is true for all substances under all conditions is given by (∂E/∂V)T = T(∂P/∂T)H - P. This equation is called the |
| A. | Maxwells equation |
| B. | Thermodynamic equation of state |
| C. | Equation of state |
| D. | Redlich-Kwong equation of state |
| Answer» C. Equation of state | |
| 48. |
One ton of refrigeration capacity is equivalent to the heat removal rate of |
| A. | 50 kcal/hr |
| B. | 200 BTU/hr |
| C. | 200 BTU/minute |
| D. | 200 BTU/day |
| Answer» D. 200 BTU/day | |
| 49. |
Which of the following units is not present in both the vapor compression refrigeration system and absorption refrigeration system? |
| A. | Expansion valve |
| B. | Condenser |
| C. | Refrigerator |
| D. | Compressor |
| Answer» E. | |
| 50. |
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 | |