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.
| 51. |
The variation of heat of reaction with temperature at constant pressure is given by the ____________ law? |
| A. | Kelvin’s |
| B. | Antoine’s |
| C. | Kirchoff’s |
| D. | None of these |
| Answer» D. None of these | |
| 52. |
The value of Joule-Thomson co-efficient, in case where cooling occurs after the throttling process is________________? |
| A. | 0 |
| B. | ∞ |
| C. | +ve |
| D. | -ve |
| Answer» D. -ve | |
| 53. |
The value of gas constant ‘R’ is__________________? |
| A. | 1.987 cal/gm mole °K |
| B. | 1.987 BTU/lb. mole °R |
| C. | Both A. and B |
| D. | Neither A. nor B |
| Answer» D. Neither A. nor B | |
| 54. |
The value of Cp & Cv respectively for monatomic gases in Kcal/kg Mole.°K are________________? |
| A. | 5 & 3 |
| B. | 3.987 & 1.987 |
| C. | 1.987 & 0.66 |
| D. | 0.66 & 1.987 |
| Answer» B. 3.987 & 1.987 | |
| 55. |
The unity of Planck’s constant ‘h’ in the equation, E = hv is____________________? |
| A. | J/s |
| B. | J.S |
| C. | J/kmol |
| D. | kmol/J |
| Answer» C. J/kmol | |
| 56. |
The unit of fugacity is the same as that of the_________________? |
| A. | Pressure |
| B. | Temperature |
| C. | Volume |
| D. | Molar concentration |
| Answer» B. Temperature | |
| 57. |
The unit of equilibrium constant of a chemical reaction is the same as that of__________________? |
| A. | Molar concentration |
| B. | Temperature |
| C. | Internal energy |
| D. | None of these |
| Answer» E. | |
| 58. |
The total change in the enthalpy of a system is independent of the _______________________? |
| A. | Number of intermediate chemical reactions involved |
| B. | Pressure and temperature |
| C. | State of combination and aggregation in the beginning and at the end of the reaction |
| D. | None of these |
| Answer» B. Pressure and temperature | |
| 59. |
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 behaves similarly |
| D. | None of these |
| Answer» B. Heat transfer from low temperature to high temperature source is not possible without external work | |
| 60. |
The thermodynamic law, PVy = constant, is not applicable in case of______________? |
| A. | Ideal compression of air |
| B. | Free expansion of an ideal gas |
| C. | Adiabatic expansion of steam in a turbine |
| D. | Adiabatic compression of a perfect gas |
| Answer» C. Adiabatic expansion of steam in a turbine | |
| 61. |
The theoretical minimum work required to separate one mole of a liquid mixture at 1 atm, containing 50 mole % each of n- heptane and n- octane into pure compounds each at 1 atm is__________________? |
| A. | -2 RT ln 0.5 |
| B. | -RT ln 0.5 |
| C. | 0.5 RT |
| D. | 2 RT |
| Answer» C. 0.5 RT | |
| 62. |
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 | |
| 63. |
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 | |
| 64. |
The temperature at the eutectic point of the system is the _____________ temperature that can be attained in the system? |
| A. | Lowest |
| B. | Highest |
| C. | Average |
| D. | None of these |
| Answer» B. Highest | |
| 65. |
The standard state of a gas (at a given temperature) is the state in which fugacity is equal to__________________? |
| A. | Unity |
| B. | Activity |
| C. | Both A. & B |
| D. | Neither A. nor B |
| Answer» D. Neither A. nor B | |
| 66. |
The standard Gibbs free energy change of a reaction depends on the equilibrium______________________? |
| A. | Pressure |
| B. | Temperature |
| C. | Composition |
| D. | All A, B. and C |
| Answer» C. Composition | |
| 67. |
The specific heat of saturated water vapour at 100°C is__________________? |
| A. | ∞ |
| B. | -ve |
| C. | 0 |
| D. | +ve |
| Answer» C. 0 | |
| 68. |
The shape of T-S diagram for Carnot Cycle is a__________________? |
| A. | Rectangle |
| B. | Rhombus |
| C. | Trapezoid |
| D. | Circle |
| Answer» B. Rhombus | |
| 69. |
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. | |
| 70. |
The root mean square speed of molecules of a gas is equal to (where, m = mass of the molecule K = Boltzmann‟s constant, T = absolute temperature) ? |
| A. | √(2KT/m) |
| B. | √(3KT/m) |
| C. | √(6KT/m) |
| D. | 3KT/m |
| Answer» C. √(6KT/m) | |
| 71. |
The relation connecting the fugacities of various components in a solution with one another and to composition at constant temperature and pressure is called the _____________ equation? |
| A. | Gibbs-Duhem |
| B. | Van Laar |
| C. | Gibbs-Helmholtz |
| D. | Margules |
| Answer» B. Van Laar | |
| 72. |
The reaction A (l) → R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The numbers of degrees of freedom are ? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» C. 3 | |
| 73. |
The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by____________________? |
| A. | (R/ΔH) (1/T1 – 1/T2) |
| B. | (ΔH/R) (1/T1 – 1/T2) |
| C. | (ΔH/R) (1/T2 – 1/T1) |
| D. | (1/R) (1/T1 – 1/T2) |
| Answer» C. (ΔH/R) (1/T2 – 1/T1) | |
| 74. |
“The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances”. This is the_________________? |
| A. | Lewis-Randall rule |
| B. | Statement of Van’t Hoff Equation |
| C. | Le-Chatelier’s principle |
| D. | None of these |
| Answer» E. | |
| 75. |
The quantitative effect of temperature on chemical equilibrium is given by the____________________? |
| A. | Van’t-Hoff equation |
| B. | Le-Chatelier’s principle |
| C. | Arrhenius equation |
| D. | None of these |
| Answer» B. Le-Chatelier’s principle | |
| 76. |
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 | |
| 77. |
The point at which all the three (solid, liquid and gas) phases co-exist, is known as the ____________ point? |
| A. | Freezing |
| B. | Triple |
| C. | Boiling |
| D. | Boyle |
| Answer» C. Boiling | |
| 78. |
The partial pressure of each constituent present in an alloy is _____________ the total vapor pressure exerted by the alloy? |
| A. | Less than |
| B. | Equal to |
| C. | More than |
| D. | Either B. or C; depends on the type of alloy |
| Answer» B. Equal to | |
| 79. |
The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of________________? |
| A. | T |
| B. | T and P |
| C. | T, P and Z |
| D. | T and Z |
| Answer» C. T, P and Z | |
| 80. |
The number of degrees of freedom for an azeotropic mixture in a two component vapourliquid equilibria is/are__________________? |
| A. | Zero |
| B. | One |
| C. | Two |
| D. | Three |
| Answer» C. Two | |
| 81. |
The number of degrees of freedom for a mixture of ice and water (liquid) are ____________________? |
| A. | 3 |
| B. | 2 |
| C. | 1 |
| D. | 0 |
| Answer» D. 0 | |
| 82. |
The number of degrees of freedom at the triple point of water is__________________? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 83. |
The number of degree of freedom for an Azeotropic mixture of ethanol and water in vapourliquid equilibrium, is__________________? |
| A. | 3 |
| B. | 1 |
| C. | 2 |
| D. | 0 |
| Answer» C. 2 | |
| 84. |
The necessary condition for phase equilibrium in a multiphase system of N components is that the____________________? |
| A. | Chemical potentials of a given component should be equal in all phases |
| B. | Chemical potentials of all components should be same in a particular phase |
| C. | Sum of the chemical potentials of any given component in all the phases should be the same |
| D. | None of these |
| Answer» B. Chemical potentials of all components should be same in a particular phase | |
| 85. |
The necessary and sufficient condition for equilibrium between two phases is_________________? |
| A. | The concentration of each component should be same in the two phases |
| B. | The temperature of each phase should be same |
| C. | The pressure should be same in the two phases |
| D. | The chemical potential of each component should be same in the two phases |
| Answer» E. | |
| 86. |
The most important application of distribution law is in_____________________? |
| A. | Evaporation |
| B. | Liquid extraction |
| C. | Drying |
| D. | Distillation |
| Answer» C. Drying | |
| 87. |
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 | |
| 88. |
The minimum number of phases that can exist in a system is________________? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 89. |
The melting point of paraffin wax (which contracts on solidification) _______________ with pressure rise? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Decreases linearly |
| Answer» B. Decreases | |
| 90. |
The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is________________? |
| A. | (∂T/∂V)S = – (∂P/∂S)V |
| B. | (∂S/∂P)T = – (∂V/∂T)P |
| C. | (∂V/∂S)P = (∂T/∂P)S |
| D. | (∂S/∂V)T = (∂P/∂T)V |
| Answer» E. | |
| 91. |
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 | |
| 92. |
The kinetic energy of gas molecule is zero at_____________________? |
| A. | 0°C |
| B. | 273°C |
| C. | 100°C |
| D. | -273°C |
| Answer» E. | |
| 93. |
The Joule-Thomson co-efficient is defined as (∂T/∂P)H. Its value at the inversion point is__________________? |
| A. | ∞ |
| B. | 1 |
| C. | 0 |
| D. | -ve |
| Answer» D. -ve | |
| 94. |
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 | |
| 95. |
The internal energy of an ideal gas is a function of its _____________ only? |
| A. | Molecular size |
| B. | Volume |
| C. | Pressure |
| D. | Temperature |
| Answer» E. | |
| 96. |
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 | |
| 97. |
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 | |
| 98. |
The intensive properties are_____________? |
| A. | Molar volume, density, viscosity and boiling point |
| B. | Refractive index and surface tension |
| C. | Both A. and B |
| D. | None of these |
| Answer» D. None of these | |
| 99. |
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. | |
| 100. |
The gas law (PV = RT) is true for an ______________ change? |
| A. | Isothermal |
| B. | Adiabatic |
| C. | Both A. & B |
| D. | Neither A. nor B |
| Answer» D. Neither A. nor B | |