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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.
| 801. |
Compound having large heat of formation is |
| A. | more stable. |
| B. | less stable. |
| C. | not at all stable (like nascent O2). |
| D. | either more or less stable ; depends on the compound. |
| Answer» B. less stable. | |
| 802. |
Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will |
| A. | increase |
| B. | decrease |
| C. | remain unchanged |
| D. | first fall and then rise. |
| Answer» B. decrease | |
| 803. |
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. | |
| 804. |
Out of the following refrigeration cycles, which one has maximum COP ? |
| A. | Air cycle |
| B. | Carnot cycle |
| C. | Ordinary vapor compression cycle |
| D. | Vapor compression with a reversible expansion engine |
| Answer» C. Ordinary vapor compression cycle | |
| 805. |
A/an __________ system is exemplified by a vessel containing a volatile liquid in contact with its vapor. |
| A. | isolated |
| B. | closed |
| C. | open |
| D. | none of these |
| Answer» D. none of these | |
| 806. |
Which of the following is affected by the temperature ? |
| A. | Fugacity |
| B. | Activity co-efficient |
| C. | Free energy |
| D. | All (a), (b) & (c) |
| Answer» E. | |
| 807. |
Entropy change of mixing two liquid substances depends upon the |
| A. | molar concentration |
| B. | quantity (i.e. number of moles) |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 808. |
In an ideal refrigeration cycle, the change in internal energy of the fluid is |
| A. | #NAME? |
| B. | #NAME? |
| 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. | |
| 809. |
Solid and liquid phases of a substance are in equilibrium at the |
| A. | critical temperature |
| B. | melting point. |
| C. | freezing point. |
| D. | both (b) and (c). |
| Answer» E. | |
| 810. |
The variation of heat of reaction with temperature at constant pressure is given by the __________ law. |
| A. | Kelvin's |
| B. | Antonie's |
| C. | Kirchoffs |
| D. | none of these |
| Answer» D. none of these | |
| 811. |
Partial molar free energy of an element A in solution is same as its |
| A. | chemical potential |
| B. | activity |
| C. | fugacity |
| D. | activity co-efficient |
| Answer» B. activity | |
| 812. |
Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the temperature should be raised to __________ °C. |
| A. | 270 |
| B. | 327 |
| C. | 300 |
| D. | 540 |
| Answer» C. 300 | |
| 813. |
Boiling of liquid is accompanied with increase in the |
| A. | vapor pressure. |
| B. | specific Gibbs free energy. |
| C. | specific entropy. |
| D. | all (a), (b) and (c). |
| Answer» B. specific Gibbs free energy. | |
| 814. |
The minimum number of phases that can exist in a system is |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 815. |
Mollier diagram is a plot of |
| A. | temperature vs. enthalpy |
| B. | temperature vs. enthalpy |
| C. | entropy vs. enthalpy |
| D. | temperature vs. internal energy |
| Answer» D. temperature vs. internal energy | |
| 816. |
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. | |
| 817. |
In an irreversible process |
| A. | Tds = dE - dW = 0 |
| B. | dE - dW - Tds = 0 |
| C. | Tds - dE + dW< 0 |
| D. | Tds - dT + dW< 0 |
| Answer» D. Tds - dT + dW< 0 | |
| 818. |
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 | |
| 819. |
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 | |
| 820. |
Which of the following is not an intensive property ? |
| A. | Chemical potential |
| B. | Surface tension |
| C. | Heat capacity |
| D. | None of these |
| Answer» D. None of these | |
| 821. |
The heat capacities for the ideal gas state depend upon the |
| A. | pressure |
| B. | temperature |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» C. both (a) & (b) | |
| 822. |
Heating of water under atmospheric pressure is an __________ process. |
| A. | isochoric |
| B. | isobaric |
| C. | adiabatic |
| D. | isothermal |
| Answer» C. adiabatic | |
| 823. |
In a reversible chemical reaction (where, Δx = number of moles of products-number of moles of reactants ) |
| A. | addition of inert gas favours the forward reaction, when Δx is positive. |
| B. | pressure has no effect on equilibrium, when Δn = 0. |
| C. | addition of inert gas has no effect on the equilibrium constant at constant volume for any value of Δx (+ ve, - ve) or zero). |
| D. | all 'a', 'b' & 'c'. |
| Answer» E. | |
| 824. |
The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same. |
| A. | kinematic viscosity |
| B. | work |
| C. | temperature |
| D. | none of these |
| Answer» E. | |
| 825. |
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 | |
| 826. |
A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect ? |
| A. | Vapor compression cycle using expansion valve. |
| B. | Air refrigeration cycle. |
| C. | Vapor compression cycle using expansion engine. |
| D. | Carnot refrigeration cycle. |
| Answer» E. | |
| 827. |
When pressure is applied on the system, icewater, then |
| A. | equilibrium can not 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. | |
| 828. |
Linde gas liquefaction process employs cooling |
| A. | by throttling |
| B. | by expansion in an engine |
| C. | at constant pressure |
| D. | none of these |
| Answer» B. by expansion in an engine | |
| 829. |
In the equation, PVn = constant, if the value of n is in between 1 and y (i.e. Cp/Cv), then it represents a reversible __________ process. |
| A. | isometric |
| B. | polytropic |
| C. | isentropic |
| D. | isobaric |
| Answer» C. isentropic | |
| 830. |
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 | |
| 831. |
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. | |
| 832. |
"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 | |
| 833. |
The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is |
| A. | less |
| B. | more |
| C. | same |
| D. | dependent on climatic conditions |
| Answer» B. more | |
| 834. |
Internal energy change of a system over one complete cycle in a cyclic process is |
| A. | zero |
| B. | #NAME? |
| C. | #NAME? |
| D. | dependent on the path |
| Answer» B. #NAME? | |
| 835. |
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). | |
| 836. |
Entropy of an ideal gas depends upon its |
| A. | pressure |
| B. | temperature |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 837. |
Equilibrium constant decreases as the temperature |
| A. | increases, for an exothermic reaction. |
| B. | decreases, for an exothermic reaction. |
| C. | increases, for an endothermic reaction. |
| D. | none of these. |
| Answer» B. decreases, for an exothermic reaction. | |
| 838. |
Maximum work that could be secured by expanding the gas over a given pressure range is the __________ work. |
| A. | isothermal |
| B. | adiabatic |
| C. | isentropic |
| D. | none of these |
| Answer» B. adiabatic | |