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.
| 1. |
While dissolving a gas into a liquid at a constant temperature, the ratio of the concentration of the gas in the solution phase and in the gaseous phase is _______________? |
| A. | Infinity |
| B. | Unity |
| C. | Constant |
| D. | Negative |
| Answer» D. Negative | |
| 2. |
With increase in compression ratio, the efficiency of the otto engine________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain constant |
| D. | Increases linearly |
| Answer» B. Decreases | |
| 3. |
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 | |
| 4. |
With increase in reduced temperature, the fugacity co-efficient of a gas at constant reduced pressure___________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | Decreases linearly |
| Answer» B. Decreases | |
| 5. |
With increase in temperature, the atomic heat capacities of all solid elements_________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Decreases linearly |
| Answer» B. Decreases | |
| 6. |
With increase in temperature, the internal energy of a substance___________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | May increase or decrease; depends on the substance |
| Answer» B. Decreases | |
| 7. |
Work done in an adiabatic process between two states depends on the__________________? |
| A. | Rate of heat transmission |
| B. | Initial state only |
| C. | End states only |
| D. | None of these |
| Answer» D. None of these | |
| 8. |
Work done is a____________________? |
| A. | Property of the system |
| B. | Path function |
| C. | Point function |
| D. | State description of a system |
| Answer» C. Point function | |
| 9. |
Work done in case of free expansion is____________________? |
| A. | Indeterminate |
| B. | Zero |
| C. | Negative |
| D. | None of these |
| Answer» C. Negative | |
| 10. |
Work done may be calculated by the expression ∫ p dA for _____________ processes ? |
| A. | Non-flow reversible |
| B. | Adiabatic |
| C. | Both A. and B |
| D. | Neither A. nor B |
| Answer» D. Neither A. nor B | |
| 11. |
Which of the following processes cannot be made reversible even under ideal condition of operation ? |
| A. | Free expansion of a gas |
| B. | Compression of air in a compressor |
| C. | Expansion of steam in a turbine |
| D. | All (A), B. & (C) |
| Answer» B. Compression of air in a compressor | |
| 12. |
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 these |
| Answer» D. None of these | |
| 13. |
Which of the following is not an equation of state ? |
| A. | Bertholet equation |
| B. | Clausius-Clapeyron equation |
| C. | Beattie-Bridgeman equation |
| D. | None of these |
| Answer» C. Beattie-Bridgeman equation | |
| 14. |
Which of the following is not a unit of the equilibrium constant Kp? (where, Δx = number of moles of products number of moles of reactants) ? |
| A. | (atm)Δx, when Δx is negative |
| B. | (atm)Δx, when Δx is positive |
| C. | Dimensionless, when Δx = 0 |
| D. | (atm)Δx2, when Δx > 0 |
| Answer» E. | |
| 15. |
Which of the following is Clausius-Clapeyron Equation for vaporisation of an ideal gas under the condition that the molar volume of liquid is negligible compared to that of the vapor ? |
| A. | d ln p/dt = Hvap/RT2 |
| B. | d ln p/dt = RT2/Hvap |
| C. | dp/dt = RT2/Hvap |
| D. | dp/dt = Hvap/RT2 |
| Answer» B. d ln p/dt = RT2/Hvap | |
| 16. |
Which of the following is an undesirable characteristic of a refrigerant ? |
| A. | It should be non-explosive |
| B. | It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils |
| C. | Its vapor pressure at the condenser temperature should be very high |
| D. | None of these |
| Answer» C. Its vapor pressure at the condenser temperature should be very high | |
| 17. |
Which of the following is a widely used refrigerant in vapour compression refrigeration system (using large centrifugal compressor) ? |
| A. | Freon |
| B. | Liquid sulphur dioxide |
| C. | Methyl chloride |
| D. | Ammonia |
| Answer» B. Liquid sulphur dioxide | |
| 18. |
Which of the following identities can be most easily used to verify steam table data for superheated steam ? |
| A. | (∂T/∂V)S = (∂p/∂S)V |
| B. | (∂T/∂P)S = (∂V/∂S)P |
| C. | (∂P/∂T)V = (∂S/∂V)T |
| D. | (∂V/∂T)P = -(∂S/∂P)T |
| Answer» E. | |
| 19. |
Which of the following has the minimum value of COP for a given refrigeration effect ? |
| A. | Reverse Carnot cycle |
| B. | Ordinary vapour-compression cycle |
| C. | Vapour-compression process with a reversible expansion engine |
| D. | Air refrigeration cycle |
| Answer» E. | |
| 20. |
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 = CvdT + PdV |
| D. | Tds = dE – PdV |
| Answer» B. dQ = CvdT + PdV | |
| 21. |
Which law of the thermodynamics provides basis for measuring the thermodynamic property ? |
| A. | First law |
| B. | Zeroth law |
| C. | Third law |
| D. | Second law |
| Answer» C. Third law | |
| 22. |
When pressure is applied on the system, ice ↔ water, then_________________? |
| A. | Equilibrium cannot be established |
| B. | More ice will be formed |
| C. | More water will be formed |
| D. | Evaporation of water will take place |
| Answer» D. Evaporation of water will take place | |
| 23. |
When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is__________________? |
| A. | More in vapour phase |
| B. | More in liquid phase |
| C. | Same in both the phases |
| D. | Replaced by chemical potential which is more in vapour phase |
| Answer» D. Replaced by chemical potential which is more in vapour phase | |
| 24. |
When liquid and vapour phase of multi-component system are in equilibrium (at a given temperature and pressure), then chemical potential of each component is___________________? |
| A. | Same in both the phases |
| B. | Zero in both the phases |
| C. | More in vapour phase |
| D. | More in liquid phase |
| Answer» B. Zero in both the phases | |
| 25. |
When dilute aqueous solutions of two salts are mixed, the process is associated with ___________________? |
| A. | Decrease in temperature |
| B. | Increase in temperature |
| C. | No change in temperature |
| D. | Change in temperature which is a function of composition |
| Answer» C. No change in temperature | |
| 26. |
When a system is in equilibrium for all possible processes, the differential or finite change of entropy is__________________? |
| A. | < 0 |
| B. | > 0 |
| C. | 0 |
| D. | None of these |
| Answer» B. > 0 | |
| 27. |
“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. | Kopp’s rule |
| C. | Law of corresponding state |
| D. | Arrhenius hypothesis |
| Answer» B. Kopp’s rule | |
| 28. |
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. | |
| 29. |
When a gas in a vessel expands, its internal energy decreases. The process involved is________________? |
| A. | Reversible |
| B. | Irreversible |
| C. | Isothermal |
| D. | Adiabatic |
| Answer» B. Irreversible | |
| 30. |
What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR (where, T1 and T2 are source & surrounding temperatures respectively.) ? |
| A. | TR/(T2 – TR) × (T1 – T2)/T1 |
| B. | TR/(T2 – TR) × T1/(T1 – T2) |
| C. | TR/(T1 – TR) × (T1 – T2)/T1 |
| D. | None of these |
| Answer» B. TR/(T2 – TR) × T1/(T1 – T2) | |
| 31. |
What is the degree of freedom for two miscible (non-reacting) substances in vapor-liquid equilibrium forming an azeotrope ? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 32. |
Water on heating from 1 to 4°C___________________? |
| A. | Contracts |
| B. | Expands |
| C. | Has same volume |
| D. | May contract or expand |
| Answer» B. Expands | |
| 33. |
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. | Clapeyron |
| D. | None of these |
| Answer» D. None of these | |
| 34. |
Vapour which is at a pressure smaller than the saturation pressure for the temperature involved is called a _____________ vapour? |
| A. | Superheated |
| B. | Desuperheated |
| C. | Non-condensable |
| D. | None of these |
| Answer» B. Desuperheated | |
| 35. |
Van Laar equation deals with the activity co-efficients in___________________? |
| A. | Binary solutions |
| B. | Ternary solutions |
| C. | Azeotropic mixture only |
| D. | None of these |
| Answer» B. Ternary solutions | |
| 36. |
Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be___________________? |
| A. | Same |
| B. | Doubled |
| C. | Halved |
| D. | One fourth of its original value |
| Answer» B. Doubled | |
| 37. |
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 | |
| 38. |
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. | √(λb/Tb) |
| D. | √(Tb/λb) |
| Answer» B. Tb/λb | |
| 39. |
Translational kinetic energy of molecules of an ideal gas is proportional to (where, T = absolute temperature of the gas)__________________? |
| A. | T |
| B. | √T |
| C. | T2 |
| D. | 1/√T |
| Answer» B. √T | |
| 40. |
(∂T/∂P)H is the mathematical expression for__________________? |
| A. | Specific heat at constant pressure (Cp) |
| B. | Specific heat at constant volume (Cv) |
| C. | Joule-Thompson co-efficient |
| D. | None of these |
| Answer» D. None of these | |
| 41. |
To obtain integrated form of Clausius-Clapeyron equation, ln (P2/P1) = (ΔHV/R) (1/T1 – 1/T2) from the exact Clapeyron equation, it is assumed that the____________________? |
| A. | Volume of the liquid phase is negligible compared to that of vapour phase |
| B. | Vapour phase behaves as an ideal gas |
| C. | Heat of vaporisation is independent of temperature |
| D. | All A , B. & C. |
| Answer» E. | |
| 42. |
Throttling process is a/an _____________ process? |
| A. | Reversible and isothermal |
| B. | Irreversible and constant enthalpy |
| C. | Reversible and constant entropy |
| D. | Reversible and constant enthalpy |
| Answer» C. Reversible and constant entropy | |
| 43. |
Throttling (Joule-Thomson effect) process is a constant _____________ process? |
| A. | Enthalpy |
| B. | Entropy |
| C. | Pressure |
| D. | None of these |
| Answer» B. Entropy | |
| 44. |
Those solutions in which there is no volume change upon mixing the components in the liquid state and which, when diluted do not undergo any heat change (i.e. heat of dilution is zero), are called ____________ solutions? |
| A. | Ideal |
| B. | Real |
| C. | Isotonic |
| D. | None of these |
| Answer» B. Real | |
| 45. |
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. | |
| 46. |
Third law of thermodynamics is concerned with the__________________? |
| A. | Value of absolute entropy |
| B. | Energy transfer |
| C. | Direction of energy transfer |
| D. | None of these |
| Answer» B. Energy transfer | |
| 47. |
Thermal efficiency of a Carnot engine can approach 100%, only when the temperature of the__________________? |
| A. | Cold reservoir approaches zero |
| B. | Hot reservoir approaches infinity |
| C. | Either A. or B |
| D. | Neither A. nor B |
| Answer» D. Neither A. nor B | |
| 48. |
There is a change in ______________ during the phase transition? |
| A. | Volume |
| B. | Pressure |
| C. | Temperature |
| D. | All a, b & c |
| Answer» B. Pressure | |
| 49. |
The work done in isothermal compression compared to that in adiabatic compression will be__________________? |
| A. | Less |
| B. | More |
| C. | Same |
| D. | More or less depending upon the extent of work done |
| Answer» C. Same | |
| 50. |
The work done in an adiabatic change in a particular gas depends upon changes in the ______________ only? |
| A. | Temperature |
| B. | Specific heat |
| C. | Volume |
| D. | Pressure |
| Answer» B. Specific heat | |