MCQOPTIONS
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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.
| 651. |
PVy = constant, holds good for an isentropic process, which is |
| A. | reversible and isothermal. |
| B. | isothermal and irreversible. |
| C. | reversible and adiabatic. |
| D. | adiabatic and irreversible. |
| Answer» D. adiabatic and irreversible. | |
| 652. |
An ideal gas is taken around the cycle ABCA as shown in P-V diagram below :The work done by the gas during the cycle is equal to |
| A. | 12 P1V1 |
| B. | 6 P1 V1 |
| C. | 3 P1V1 |
| D. | P1 V1 |
| Answer» D. P1 V1 | |
| 653. |
In case of a close thermodynamic system, there is __________ across the boundaries. |
| A. | no heat and mass transfer |
| B. | no mass transfer but heat transfer |
| C. | mass and energy transfer |
| D. | none of these |
| Answer» C. mass and energy transfer | |
| 654. |
For multicomponent 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) | |
| 655. |
In a turbine, the fluid expands almost |
| A. | isothermally |
| B. | isobarically |
| C. | adiabatically |
| D. | none of these |
| Answer» D. none of these | |
| 656. |
The internal energy of an ideal gas does not change in a reversible __________ process. |
| A. | isothermal |
| B. | adiabatic |
| C. | isobaric |
| D. | isometric |
| Answer» B. adiabatic | |
| 657. |
Enthalpy of a gas depends upon its |
| A. | temperature |
| B. | mass |
| C. | volume |
| D. | pressure |
| Answer» B. mass | |
| 658. |
For an incompressible fluid, the __________ is a function of both pressure as well as temperature. |
| A. | internal energy |
| B. | enthalpy |
| C. | entropy |
| D. | all (a), (b) & (c) |
| Answer» C. entropy | |
| 659. |
Mollier chart is a __________ plot. |
| A. | pressure vs enthalpy |
| B. | pressure vs volume |
| C. | enthalpy vs entropy |
| D. | temperature vs entropy |
| Answer» D. temperature vs entropy | |
| 660. |
Cp 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. | |
| 661. |
The internal energy of an incompressible fluid depends upon its |
| A. | pressure |
| B. | temperature |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» C. both (a) & (b) | |
| 662. |
The third law of thermodynamics states that the |
| A. | heat capacity of a crystalline solid is zero at absolute zero temperature. |
| B. | heat transfer from low temperature to high temperature source is not possible without external work. |
| C. | gases having same reduced properties behave similarly. |
| D. | none of these. |
| Answer» B. heat transfer from low temperature to high temperature source is not possible without external work. | |
| 663. |
The temperature at which both liquid and gas phases are identical, is called the __________ point. |
| A. | critical |
| B. | triple |
| C. | freezing |
| D. | boiling |
| Answer» B. triple | |
| 664. |
At the critical point of a substance |
| A. | the surface tension vanishes. |
| B. | liquid and vapour have the same density. |
| C. | there is no distinction between liquid and vapour phases. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 665. |
"Law of corresponding states" says that |
| A. | , two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same. |
| B. | the surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature. |
| C. | no gas can be liquified above the critical temperature, howsoever high the pressure may be. |
| D. | the molar heat of energy of gas at constant volume should be nearly constant (about 3 calories). |
| Answer» B. the surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature. | |
| 666. |
Water on heating from 1 to 4°C$ |
| A. | contracts |
| B. | expands |
| C. | has same volume |
| D. | may contract or expand |
| Answer» B. expands | |
| 667. |
Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.). |
| A. | entropy |
| B. | internal energy |
| C. | enthalpy |
| D. | Gibbs free energy |
| Answer» E. | |
| 668. |
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 | |
| 669. |
The amount of heat required to decompose a compound into its elements is __________ the heat of formation of that compound from its elements. |
| A. | less than |
| B. | more than |
| C. | same as |
| D. | not related to |
| Answer» D. not related to | |
| 670. |
Extensive properties of a thermodynamic system depend upon the __________ of the system. |
| A. | specific volume |
| B. | temperature |
| C. | mass |
| D. | pressure |
| Answer» D. pressure | |
| 671. |
In any spontaneous process, |
| A. | only F decreases |
| B. | only A decreases |
| C. | both F and A decreases |
| D. | both F and A increase |
| Answer» D. both F and A increase | |
| 672. |
The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called the __________ temperature. |
| A. | critical |
| B. | Boyle |
| C. | inversion |
| D. | reduced |
| Answer» C. inversion | |
| 673. |
The main feature of Carnot refrigeration cycle is that, it |
| A. | does not need the addition of external work for its functioning. |
| B. | transfers heat from high temperature to low temperature. |
| C. | accomplishes the reverse effect of the heat engine. |
| D. | none of these. |
| Answer» D. none of these. | |
| 674. |
Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the |
| A. | two temperatures only. |
| B. | pressure of working fluid. |
| C. | mass of the working fluid. |
| D. | mass and pressure both of the working fluid. |
| Answer» B. pressure of working fluid. | |
| 675. |
Degree of freedom of a system consisting of a gaseous mixture of H2 and NH3 will be |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» E. | |
| 676. |
For an isothermal reversible compression of an ideal gas |
| A. | only ΔE = 0 |
| B. | only ΔH =0 |
| C. | ΔE = ΔH = 0 |
| D. | dQ = dE |
| Answer» D. dQ = dE | |
| 677. |
If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the |
| A. | Maxwell's equation |
| B. | Clayperon-Claussius equation |
| C. | Van Laar equation |
| D. | Nernst Heat Theorem |
| Answer» C. Van Laar equation | |
| 678. |
Joule-Thomson experiment is |
| A. | isobaric |
| B. | adiabatic |
| C. | isenthalpic |
| D. | both(b) & (c) |
| Answer» E. | |
| 679. |
In an adiabatic process, the |
| A. | heat transfer is zero. |
| B. | temperature change is zero. |
| C. | work done is a path function. |
| D. | enthalpy remains constant. |
| Answer» B. temperature change is zero. | |
| 680. |
Activity co-efficient is a measure of the |
| A. | departure from ideal solution behaviour. |
| B. | departure of gas phase from idea] gas law. |
| C. | vapour pressure of liquid. |
| D. | none of these. |
| Answer» B. departure of gas phase from idea] gas law. | |
| 681. |
For a spontaneous process, free energy |
| A. | is zero |
| B. | increases |
| C. | decreases whereas the entropy increases |
| D. | and entropy both decrease |
| Answer» D. and entropy both decrease | |
| 682. |
The accentric factor of a materical, 'ω', is defined as ω = -log10(Prsat)Tr-1 = 0.7, where, Prsat = reduced vapor pressure, Tr = reduced temperature. The value of accentric factor is always$ |
| A. | > 2 |
| B. | < 1 |
| C. | > 1 |
| D. | < 3 |
| Answer» C. > 1 | |
| 683. |
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 | |
| 684. |
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. | |
| 685. |
The second law of thermodynamics states that |
| A. | the energy change of a system undergoing any reversible process is zero. |
| B. | it is not possible to transfer heat from a lower temperature to a higher temperature. |
| C. | the total energy of system and surrounding remains the same. |
| D. | none of the above. |
| Answer» E. | |
| 686. |
What is the value of ln y (where y = activity co-efficient) for ideal gases ? |
| A. | Zero |
| B. | Unity |
| C. | Infinity |
| D. | Negative |
| Answer» B. Unity | |
| 687. |
1st law of thermodynamics is nothing but the law of conservation of |
| A. | momentum |
| B. | mass |
| C. | energy |
| D. | none of these |
| Answer» D. none of these | |
| 688. |
The equation, Cp - Cv = R, is true for __________ gas. |
| A. | no |
| B. | any real |
| C. | only ideal |
| D. | both (b) and (c) |
| Answer» D. both (b) and (c) | |
| 689. |
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) | |
| 690. |
Isobaric process means a constant process. |
| A. | temperature |
| B. | pressure |
| C. | volume |
| D. | entropy |
| Answer» C. volume | |
| 691. |
Generation of heat by friction is an example of a/an __________ change. |
| A. | isothermal |
| B. | irreversible |
| C. | adiabatic |
| D. | reversible |
| Answer» C. adiabatic | |
| 692. |
Internal energy of an element at 1 atm and 25° C is __________ kcal/kg.mole.$ |
| A. | 0 |
| B. | 273 |
| C. | 25 |
| D. | none of these |
| Answer» B. 273 | |
| 693. |
If heat contents of CH4, C2H4 and C3H8 are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH4(g) + C2H4(g) C3H8(g) will be __________ Kcal.$ |
| A. | -19.4 |
| B. | -30.2 |
| C. | 55.2 |
| D. | -55.2 |
| Answer» B. -30.2 | |
| 694. |
4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is |
| A. | 4 J |
| B. | ‚àû |
| C. | 0 |
| D. | 8 J |
| Answer» D. 8 J | |
| 695. |
1m3 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 | |
| 696. |
Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in |
| A. | increased COP. |
| B. | same COP. |
| C. | decreased COP. |
| D. | increased or decreased COP ; depending upon the type of refrigerant. |
| Answer» B. same COP. | |
| 697. |
A large iceberg melts at the base, but not at the top, because of the reason that |
| A. | ice at the base contains impurities which lowers its melting point. |
| B. | due to the high pressure at the base, its melting point reduces. |
| C. | the iceberg remains in a warmer condition at the base. |
| D. | all (a), (b) and (c). |
| Answer» C. the iceberg remains in a warmer condition at the base. | |
| 698. |
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 | |
| 699. |
Critical compressibility factor for all substances |
| A. | are more or less constant (vary from 0.2 to 0.3). |
| B. | vary as square of the absolute temperature. |
| C. | vary as square of the absolute pressure. |
| D. | none of these. |
| Answer» B. vary as square of the absolute temperature. | |
| 700. |
For a reversible process involving only pressure-volume work |
| A. | (dF)T, p < 0 |
| B. | (dF)T, p > 0 |
| C. | (dF)T, p = 0 |
| D. | (dA)T, v < 0 |
| Answer» D. (dA)T, v < 0 | |