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.
| 551. |
A system is said to be at equilibrium, if the entropy of the system has reached __________ value. |
| A. | minimum |
| B. | zero |
| C. | maximum |
| D. | none of these |
| Answer» D. none of these | |
| 552. |
At __________ point, all the three phases (i.e.solid, liquid and gas) co-exist. |
| A. | eutcetic |
| B. | triple |
| C. | plait |
| D. | critical |
| Answer» C. plait | |
| 553. |
Internal energy of an ideal gas |
| A. | increases with increase in pressure. |
| B. | decreases with increase in temperature. |
| C. | is independent of temperature. |
| D. | none of these. |
| Answer» E. | |
| 554. |
High pressure steam is expanded adiabati-cally and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process:$ |
| A. | Δ H = 0 and ΔS = 0. |
| B. | Δ H ≠ 0 and ΔS = 0. |
| C. | Δ H ≠ 0 and ΔS ≠ 0. |
| D. | Δ H = 0 and ΔS ≠ 0. |
| Answer» C. Œî H ‚↠0 and ŒîS ‚↠0. | |
| 555. |
If two pure liquid constituents are mixed in any proportion to give an ideal solution, there is no change in |
| A. | volume |
| B. | enthalpy |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 556. |
Which of the following is an extensive property of a system ? |
| A. | Heat capacity |
| B. | Molal heat capacity |
| C. | Pressure |
| D. | Concentration |
| Answer» B. Molal heat capacity | |
| 557. |
The principle applied in liquefaction of gases is |
| A. | adiabatic expansion. |
| B. | Joule-Thomson effect. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 558. |
Requisites of a reversible process is that the |
| A. | system and surroundings pressure be equal. |
| B. | friction in the system should be absent. |
| C. | system and surroundings temperature be equal. |
| D. | none of these. |
| Answer» C. system and surroundings temperature be equal. | |
| 559. |
What is the value of Joule-Thomson co-efficient for an ideal gas ? |
| A. | #NAME? |
| B. | #NAME? |
| C. | 0 |
| D. | ‚àû |
| Answer» D. ‚àû | |
| 560. |
If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be __________ c.c. |
| A. | 100 |
| B. | 50 |
| C. | 205 |
| D. | 200 |
| Answer» E. | |
| 561. |
Critical temperature is defined as the temperature above which a gas will |
| A. | not liquify (barring exceptions). |
| B. | immediately liquify. |
| C. | never liquify however high the pressure may be. |
| D. | none of these. |
| Answer» D. none of these. | |
| 562. |
Clausius - Clayperon equation is applicable to __________ equilibrium processes. |
| A. | solid-vapor |
| B. | solid-liquid |
| C. | liquid-vapor |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 563. |
In case of an __________ process, the temperature of the system increases. |
| A. | isothermal compression |
| B. | isothermal expansion |
| C. | adiabatic expansion |
| D. | adiabatic compression |
| Answer» E. | |
| 564. |
The number of degrees of freedom for an azeotropic mixture in a two component vapour-liquid equilibria is/are |
| A. | zero |
| B. | one |
| C. | two |
| D. | three |
| Answer» C. two | |
| 565. |
The equation, , applicable to a binary solution of components. A and B 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. | |
| 566. |
In the reaction, H2 +I2 2HI, addition of an inert gas will |
| A. | increase the partial pressure of H2. |
| B. | increase the partial pressure of I2. |
| C. | increase the total pressure and hence shift the equilibrium towards the right. |
| D. | not effect the equilibrium conditions |
| Answer» E. | |
| 567. |
The specific heat of saturated water vapour at 100°C is$ |
| A. | ‚àû |
| B. | #NAME? |
| C. | 0 |
| D. | #NAME? |
| Answer» C. 0 | |
| 568. |
Throttling (Joule-Thomson effect) process is a constant __________ process. |
| A. | enthalpy |
| B. | entropy |
| C. | pressure |
| D. | none of these |
| Answer» B. entropy | |
| 569. |
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. | |
| 570. |
Fugacity of a component in an ideal gas mixture is euqal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at contant pressure and temperature __________ as its mole fraction increases. |
| A. | decreases |
| B. | decreases exponentially |
| C. | increases |
| D. | remains constant |
| Answer» D. remains constant | |
| 571. |
At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be |
| A. | more |
| B. | less |
| C. | same |
| D. | more or less ; depending on the system. |
| Answer» D. more or less ; depending on the system. | |
| 572. |
y = specific heat ratio of an ideal gas is equal to |
| A. | Cp/Cv |
| B. | Cp/(CP-R) |
| C. | 1 + (R/CV) |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 573. |
An irreversible process |
| A. | is the analog of linear frictionless motion in machines. |
| B. | is an idealised visualisation of behaviour of a system. |
| C. | yields the maximum amount of work. |
| D. | yields an amount of work less than that of a reversible process. |
| Answer» E. | |
| 574. |
The molar excess Gibbs free energy, gE, for a binary liquid mixture at T and P is given by, (gE/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 . x22 |
| B. | Ax1 |
| C. | Ax2 |
| D. | Ax12 |
| Answer» B. Ax1 | |
| 575. |
Heat requirement for decomposition of a compound into its elements is __________ that is evolved during the formation of that compound from its elements. |
| A. | the same |
| B. | less than |
| C. | greater than |
| D. | different than |
| Answer» B. less than | |
| 576. |
In a reversible process |
| A. | Tds = dE + dW |
| B. | dE - dW = Tds |
| C. | dW - dE = Tds |
| D. | Tds - dW + dE >0 |
| Answer» B. dE - dW = Tds | |
| 577. |
Entropy change of the reaction, H2O(liquid) H2O(gas), is termed as the enthalpy of |
| A. | solution |
| B. | vaporisation |
| C. | formation |
| D. | formation |
| Answer» C. formation | |
| 578. |
A thermodynamic system is taken from state A to B along ACB and is brought back to A along BDA as shown below in the P-V diagram. The net work done during the complete cycle is given by the area covered by |
| A. | P1ACBP2P1 |
| B. | ACBB1A1A |
| C. | ACBDA |
| D. | ADBB1A1A |
| Answer» D. ADBB1A1A | |
| 579. |
In polytropic process (PVn = constant), if n = 1; it means a/an __________ process. |
| A. | adiabatic |
| B. | reversible |
| C. | isothermal |
| D. | none of these |
| Answer» D. none of these | |
| 580. |
For an ideal liquid solution, which of the following is unity ? |
| A. | Activity |
| B. | Fugacity |
| C. | Activity co-efficient |
| D. | Fugacity co-efficient |
| Answer» D. Fugacity co-efficient | |
| 581. |
Joule-Thomson effect i.e., a throttling process is a constant __________ process. |
| A. | entropy |
| B. | temperature |
| C. | internal energy |
| D. | enthalpy |
| Answer» E. | |
| 582. |
In case of a reversible process (following pvn = constant), work obtained for trebling the volume (v1 = 1 m3 and v2 3 m3 ) is max imum, when the value of 'n' is |
| A. | 0 |
| B. | 1 |
| C. | y = 1.44 |
| D. | 1.66 |
| Answer» B. 1 | |
| 583. |
The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called __________ temperature. |
| A. | Boyle |
| B. | inversion |
| C. | critical |
| D. | reduced |
| Answer» B. inversion | |
| 584. |
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. | ‚àû |
| C. | #NAME? |
| D. | #NAME? |
| Answer» B. ‚àû | |
| 585. |
Specific heat of a gas for a reversible adiabatic process is |
| A. | negative |
| B. | zero |
| C. | infinity |
| D. | none of these |
| Answer» C. infinity | |
| 586. |
Pick out the correct equation relating 'F' and 'A'. |
| A. | F = A + PV |
| B. | F = E + A |
| C. | F = A - TS |
| D. | F = A + TS |
| Answer» B. F = E + A | |
| 587. |
After throttling, gas temperature |
| A. | decreases |
| B. | increases |
| C. | remains same |
| D. | may increase or decrease ; depends on the nature of the gas |
| Answer» B. increases | |
| 588. |
Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure ____with the increase of reduced temperature. |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | decreases logarithmically |
| Answer» C. remains constant | |
| 589. |
Duringthe phase transition, __________ changes. |
| A. | pressure |
| B. | volume |
| C. | temperature |
| D. | all (a), (b) and (c) |
| Answer» C. temperature | |
| 590. |
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 = CpdT + Vdp |
| D. | Tds = dE - PdV |
| Answer» B. dQ = CvdT + PdV | |
| 591. |
Joule-Thomson co-efficient for a perfect gas is |
| A. | zero |
| B. | positive |
| C. | negative |
| D. | none of these |
| Answer» B. positive | |
| 592. |
A refrigerator works on the principle of __________ law of thermodynamics. |
| A. | zeroth |
| B. | first |
| C. | second |
| D. | third |
| Answer» D. third | |
| 593. |
The fusion of a crystalline solid at its melting point to form a liquid at the same temperature is accompanied by |
| A. | decrease in enthalpy corresponding to evolution of heat. |
| B. | decrease of entropy. |
| C. | increase in enthalpy corresponding to absorption of heat. |
| D. | no change in enthalpy. |
| Answer» D. no change in enthalpy. | |
| 594. |
At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by(where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.)$ |
| A. | μ° + RT ln f |
| B. | μ°+ R lnf |
| C. | μ° + T lnf |
| D. | μ° + R/T lnf |
| Answer» B. Œº¬∞+ R lnf | |
| 595. |
Chemical potential is a/an |
| A. | extensive property. |
| B. | intensive property. |
| C. | force which drives the chemical system to equilibrium. |
| D. | both (b) and (c). |
| Answer» E. | |
| 596. |
The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 - T2)/T1. The co-efficient of performance (C.O.P.) of a Carnot heat pump operating between T1 and T2 is given by |
| A. | T1/(T1-T2) |
| B. | T2/(T1-T2) |
| C. | T1/T2 |
| D. | T2/R1 |
| Answer» B. T2/(T1-T2) | |
| 597. |
Heat is added at constant pressure in an ideal __________ cycle. |
| A. | Stirling |
| B. | Brayton |
| C. | Rankine |
| D. | both (b) and (c) |
| Answer» E. | |
| 598. |
Joule-Thomson Co-efficient at any point on the inversion curve is |
| A. | ‚àû |
| B. | #NAME? |
| C. | 0 |
| D. | #NAME? |
| Answer» D. #NAME? | |
| 599. |
In the decomposition of PCl5 represented by, PCl5 PCl3 + Cl2, decrease in the pressure of the system will __________ the degree of dissociation of PCl5. |
| A. | increase |
| B. | decrease |
| C. | not alter |
| D. | none of these |
| Answer» B. decrease | |
| 600. |
The internal energy of a gas obeying P (V - b) RT (where, b is a positive constant and has a constant Cv), depends upon its |
| A. | pressure |
| B. | volume |
| C. | temperature |
| D. | all (a), (b) & (c). |
| Answer» D. all (a), (b) & (c). | |