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MCQOPTIONS
This section includes 838 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. |
The accentric factor of a materical, 'ω', is defined as ω = -log() = 0.7, where, = reduced vapor pressure, = reduced temperature. The value of accentric factor is always |
| A. | > 2 |
| B. | < 1 |
| C. | > 1 |
| D. | < 3 |
| Answer» C. > 1 | |
| 2. |
The chemical potential of a component (μ) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of sustance added for an infinitesimal addition at constant temperature and pressure. It is given by |
| A. | all (a), (b) and (c) |
| Answer» E. | |
| 3. |
The expression, , gives the free energy change |
| A. | with pressure changes at constant temperature. |
| B. | under reversible isothermal volume change. |
| C. | during heating of an ideal gas. |
| D. | during cooling of an ideal gas. |
| Answer» B. under reversible isothermal volume change. | |
| 4. |
Pick out the wrong statement pertaining to the decomposition of PCl represented by, PCl PCl + Cl.Degree of dissociation of PCl will |
| A. | decrease on addition of Cl |
| B. | . |
| C. | increase on addition of an inert gas at constant pressure. |
| D. | decrease on increasing the pressure of the system. |
| E. | none of these |
| Answer» E. none of these | |
| 5. |
As the temperature is lowered towards the absolute zero, the value of the quantity approaches |
| A. | zero |
| B. | unity |
| C. | infinity |
| D. | none of these |
| Answer» B. unity | |
| 6. |
Joule-Thomson co-efficient which is defined as, , changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is |
| A. | 0 |
| B. | ∞ |
| C. | +ve |
| D. | -ve |
| Answer» B. ∞ | |
| 7. |
The expression, , is for the____of an ideal gas. |
| A. | compressibility |
| B. | work done under adiabatic contition |
| C. | work done under isothermal condition |
| D. | co-efficient of thermal expansion |
| Answer» D. co-efficient of thermal expansion | |
| 8. |
Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg . K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is |
| A. | superheated vapour. |
| B. | partially condensed vapour with quality of 0.9. |
| C. | saturated vapour. |
| D. | partially condensed vapour with quality of 0.1. |
| Answer» B. partially condensed vapour with quality of 0.9. | |
| 9. |
The Joule-Thomson co-efficient is defined as (∂/∂). Its value at the inversion point is |
| A. | ∞ |
| B. | 1 |
| C. | 0 |
| D. | -ve |
| Answer» D. -ve | |
| 10. |
In the reaction, represented by, 2SO + O 2SO; ΔH = - 42 kcal; the forward reaction will be favoured by |
| A. | low temperature |
| B. | high pressure |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 11. |
The expression for entropy change given by, Δ = - ln (/), holds good for |
| A. | expansion of a real gas. |
| B. | reversible isothermal volume change. |
| C. | heating of an ideal gas. |
| D. | cooling of a real gas. |
| Answer» C. heating of an ideal gas. | |
| 12. |
For a constant pressure reversible process, the enthalpy change (ΔH) of the system is |
| A. | . |
| B. | . |
| Answer» D. | |
| 13. |
Choose the condition that must be specified in order to liquify CO (triple point for CO 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. | |
| 14. |
Molar heat capacity of water in equilibrium with ice at constant pressure is __________ Kcal/kg mole . °K |
| A. | 0 |
| B. | ∞ |
| C. | 50 |
| D. | 100 |
| Answer» C. 50 | |
| 15. |
If heat contents of CH, CH and CH are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH() + CH() CH() will be __________ Kcal. |
| A. | -19.4 |
| B. | -30.2 |
| C. | 55.2 |
| D. | -55.2 |
| Answer» B. -30.2 | |
| 16. |
As pressure approaches zero, the ratio of fugacity to pressure (/) for a gas approaches |
| A. | zero |
| B. | unity |
| C. | infinity |
| D. | an indeterminate value |
| Answer» C. infinity | |
| 17. |
In the ammonia synthesis reaction, N + 3H 2NH + 22.4 kcal, the formation of NH will be favoured by |
| A. | high temperature. |
| B. | low pressure. |
| C. | low temperature only. |
| D. | both low temperature and high pressure. |
| Answer» E. | |
| 18. |
To obtain integrated form of Clausius-Clayperon equation, , from the exact Clayperon equafion, 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. | |
| 19. |
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. | |
| 20. |
The internal energy of a gas obeying ( - ) (where, is a positive constant and has a constant ), depends upon its |
| A. | pressure |
| B. | volume |
| C. | temperature |
| D. | all (a), (b) & (c). |
| Answer» D. all (a), (b) & (c). | |
| 21. |
Trouton's ratio is given by (where λ, = molal heat of vaporisation of a substance at its normal boiling point, kcal/kmol = normal boiling point, °K ) |
| A. | λ |
| B. | / |
| C. | /λ |
| Answer» B. / | |
| 22. |
Consider the reaction, C + O CO ;ΔH = - 94 kcal. What will be the value of ΔH for the reaction CO C + O ? |
| A. | -94 kcal |
| B. | + 94 kcal |
| C. | > 94 kcal |
| D. | < -94 kcal |
| Answer» C. > 94 kcal | |
| 23. |
Which is not a state function ? |
| A. | Specific volume |
| B. | Work |
| C. | Pressure |
| D. | Temperature |
| Answer» C. Pressure | |
| 24. |
In the decomposition of PCl represented by, PCl PCl + Cl, decrease in the pressure of the system will __________ the degree of dissociation of PCl. |
| A. | increase |
| B. | decrease |
| C. | not alter |
| D. | none of these |
| Answer» B. decrease | |
| 25. |
The expression for entropy change given by, Δ = ln (/) + ln (/) is valid for |
| A. | reversible isothermal volume change. |
| B. | heating of a substance. |
| C. | cooling of a substance. |
| D. | simultaneous heating and expansion of an ideal gas. |
| Answer» E. | |
| 26. |
1m of an ideal gas at 500 K and 1000 kPa expands reversibly to 5 times its initial volume in an insulated container. If the specific heat capacity (at constant pressure) of the gas is 21 J/mole . K, the final temperature will be |
| A. | 35 K |
| B. | 174 K |
| C. | 274 K |
| D. | 154 K |
| Answer» D. 154 K | |
| 27. |
#NAME? |
| A. | reversible and isothermal. |
| B. | isothermal and irreversible. |
| C. | reversible and adiabatic. |
| D. | adiabatic and irreversible. |
| Answer» D. adiabatic and irreversible. | |
| 28. |
Which of the following represents the Virial equation of state ? |
| A. | + μ |
| B. | μ |
| C. | = 0 |
| Answer» C. = 0 | |
| 29. |
Degree of freedom of a system consisting of a gaseous mixture of H and NH will be |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» E. | |
| 30. |
In the equation, = constant, if the value of = ± ∞, then it represents a reversible __________ process. |
| A. | adiabatic |
| B. | isometric |
| C. | isentropic |
| D. | isothermal |
| Answer» C. isentropic | |
| 31. |
In the reaction, C + O CO ; ΔH = - 94 kcal. What is the heat content (enthalpy)of O? |
| A. | -94 kcal |
| B. | > -94 kcal |
| C. | < - 94 kcal |
| D. | zero |
| Answer» E. | |
| 32. |
Work done may be calculated by the expression for __________ processes. |
| A. | non-flow reversible |
| B. | adiabatic |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 33. |
The molar excess Gibbs free energy, , for a binary liquid mixture at and is given by, (/) = . . , where is a constant. The corresponding equation for ln , where is the activity co-efficient of component 1, is |
| A. | . |
| Answer» B. | |
| 34. |
For spontaneous changes in an isolated system ( = entropy) |
| A. | = 0 |
| B. | <0 |
| C. | > 0 |
| D. | = Constant |
| Answer» D. = Constant | |
| 35. |
A cylinder contains 640 gm of liquid oxygen. The volume occupied (in litres) by the oxygen, when it is released and brought to standard conditions (0°C, 760 mm Hg) will be __________ litres. |
| A. | 448 |
| B. | 224 |
| C. | 22.4 |
| D. | data insufficient; can't be computed |
| Answer» B. 224 | |
| 36. |
In the equation = constant, if the value of = = /, then it represents a reversible __________ process. |
| A. | isothermal |
| B. | adiabatic |
| C. | isentropic |
| D. | polytropic |
| Answer» D. polytropic | |
| 37. |
The ammonia synthesis reaction represented by N + 3H 2NH ; ΔH = - 22.4 kcal, is |
| A. | endothermic |
| B. | exothermic |
| C. | isothermal |
| D. | adiabatic |
| Answer» C. isothermal | |
| 38. |
The equation, , applicable to a binary solution of components. and in equilibrium with their vapors at constant temperature and pressure is called the __________ equation. |
| A. | Van Laar |
| B. | Margules |
| C. | Gibbs-Duhem |
| D. | Gibbs-Duhem-Margules |
| Answer» E. | |
| 39. |
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 | |
| 40. |
An ideal monoatomic gas is taken round the cycle as shown below in the diagram The work done during the cycle is |
| A. | 2 |
| B. | /2 |
| C. | 0 |
| Answer» B. /2 | |
| 41. |
Sublimation temperature of dry ice (solid CO) is __________ °C. |
| A. | -273 |
| B. | 0 |
| C. | -78 |
| D. | 5 |
| Answer» D. 5 | |
| 42. |
In the equation, = constant, if the value of is in between 1 and y (.. /), then it represents a reversible __________ process. |
| A. | isometric |
| B. | polytropic |
| C. | isentropic |
| D. | isobaric |
| Answer» C. isentropic | |
| 43. |
Entropy change of the reaction, HO(liquid) HO(gas), is termed as the enthalpy of |
| A. | solution |
| B. | vaporisation |
| C. | formation |
| D. | formation |
| Answer» C. formation | |
| 44. |
The equation, = , is best obeyed by gases at |
| A. | low pressure & high temperature. |
| B. | high pressure & low temperature. |
| C. | low pressure & low temperature. |
| D. | none of these. |
| Answer» B. high pressure & low temperature. | |
| 45. |
The equation = - applies to |
| A. | single phase fluid of varying composition. |
| B. | single phase fluid of constant composition. |
| C. | open as well as closed systems. |
| D. | both (b) and (c) |
| Answer» E. | |
| 46. |
With increase in pressure (above atmospheric pressure), the of a gas |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | first decreases and then increases |
| Answer» B. decreases | |
| 47. |
The gas law ( = ) is true for an __________ change. |
| A. | isothermal |
| B. | adiabatic |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 48. |
Free energy changes for two reaction mechanism '' and ' are respectively - 15 and - 5 units. It implies that is |
| A. | slower than |
| B. | faster than |
| C. | three times slower than |
| D. | three times faster than |
| Answer» C. three times slower than | |
| 49. |
In case of the decomposition of hydroiodic acid (2HI H + I), addition of H (at equilibrium condition) will |
| A. | increase the partial pressure of I |
| B. | . |
| C. | decrease the partial pressure of HI. |
| D. | diminish the degree of dissociation of HI. |
| E. | none of these. |
| Answer» D. diminish the degree of dissociation of HI. | |
| 50. |
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. | |