MCQOPTIONS
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MCQOPTIONS
This section includes 469 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. |
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 | |
| 52. |
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 | |
| 53. |
Entropy change for an irreversible process taking system and surrounding together is%! |
| A. | 0 |
| B. | > 0 |
| C. | < 0 |
| D. | None of these |
| Answer» C. < 0 | |
| 54. |
With increase in pressure (above atmospheric pressure), the Cp of a gas%! |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | First decreases and then increases |
| Answer» B. Decreases | |
| 55. |
Minimum number of phases that exists in a system is 1. Number of chemical species in a colloidal system is%! |
| A. | 1 |
| B. | 4 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 56. |
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 | |
| 57. |
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 | |
| 58. |
*$_Which is a state function?? |
| A. | Specific volume |
| B. | Work |
| C. | Pressure |
| D. | Temperature |
| Answer» C. Pressure | |
| 59. |
*$_In an ideal gas mixture, fugacity of a species is equal to its? |
| A. | Vapor pressure |
| B. | Partial pressure |
| C. | Chemical potential |
| D. | None of these |
| Answer» C. Chemical potential | |
| 60. |
*$_Absolute zero temperature signifies the? |
| A. | Minimum temperature attainable |
| B. | Temperature of the heat reservoir to which a Carnot engine rejects all the heat that is taken in |
| C. | Temperature of the heat reservoir to which a Carnot engine rejects no heat |
| D. | None of these |
| Answer» D. None of these | |
| 61. |
*$_The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is? |
| A. | R loge 4 |
| B. | R log10 4 |
| C. | Cv log10 4 |
| D. | Cv loge 4 |
| Answer» B. R log10 4 | |
| 62. |
*$_If the molar heat capacities (Cp or Cv) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will? |
| A. | Increase |
| B. | Decrease |
| C. | Remain unaltered |
| D. | Increase or decrease ; depends on the particular reaction |
| Answer» D. Increase or decrease ; depends on the particular reaction | |
| 63. |
*$_Gibbs free energy per mole for a pure substance is equal to the? |
| A. | Latent heat of vaporisation |
| B. | Chemical potential |
| C. | Molal boiling point |
| D. | Heat capacity |
| Answer» C. Molal boiling point | |
| 64. |
*$_4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is? |
| A. | 4 J |
| B. | ‚à û |
| C. | 0 |
| D. | 8 J |
| Answer» D. 8 J | |
| 65. |
*$_Degress of freedom at triple point will be? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 66. |
*$_The specific heat of saturated water vapour at 100°C is? |
| A. | ‚à û |
| B. | -ve |
| C. | 0 |
| D. | +ve |
| Answer» C. 0 | |
| 67. |
*$_With increase in pressure (above atmospheric pressure), the Cp of a gas? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | First decreases and then increases |
| Answer» B. Decreases | |
| 68. |
*$_Minimum number of phases that exists in a system is 1. Number of chemical species in a colloidal system is? |
| A. | 1 |
| B. | 4 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 69. |
*$_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 | |
| 70. |
*$_Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in? |
| A. | Increased COP |
| B. | Same COP |
| C. | Decreased COP |
| D. | Increased or decreased COP ; depending upon the type of refrigerant |
| Answer» B. Same COP | |
| 71. |
*$_Entropy change for an irreversible process taking system and surrounding together is? |
| A. | 0 |
| B. | > 0 |
| C. | < 0 |
| D. | None of these |
| Answer» C. < 0 | |
| 72. |
*$___________ functions are exemplified by heat and work.? |
| A. | Path |
| B. | Point |
| C. | State |
| D. | None of these |
| Answer» B. Point | |
| 73. |
*$_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 of the above |
| Answer» E. | |
| 74. |
*$_The standard state of a gas (at a given temperature) is the state in which fugacity is equal to? |
| A. | Unity |
| B. | Activity |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 75. |
*$_In the reaction, C + O₂ → CO₂ ; ΔH = - 94 kcal. What is the heat content (enthalpy)of O₂?? |
| A. | -94 kcal |
| B. | > -94 kcal |
| C. | < - 94 kcal |
| D. | Zero |
| Answer» E. | |
| 76. |
*$_Which of the following is not a unit of the equilibrium constant Kp? (where, Δx = number of moles of products number of moles of reactants)? |
| A. | (atm)Δx, when Δx is negative |
| B. | (atm)Δx, when Δx is positive |
| C. | Dimensionless, when Δx = 0 |
| D. | (atm)Δx2, when Δx > 0 |
| Answer» E. | |
| 77. |
*$_A gas performs the maximum work, when it expands? |
| A. | Non-uniformly |
| B. | Adiabatically |
| C. | Isobarically |
| D. | Isothermally |
| Answer» D. Isothermally | |
| 78. |
*$_At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by(where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.)? |
| A. | μ° + RT ln f |
| B. | μ°+ R lnf |
| C. | μ° + T lnf |
| D. | μ° + R/T lnf |
| Answer» B. ≈í¬∫¬¨‚àû+ R lnf | |
| 79. |
*$_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 | |
| 80. |
*$_Cv for an ideal gas? |
| A. | Does not depend upon temperature |
| B. | Is independent of pressure only |
| C. | Is independent of volume only |
| D. | Is independent of both pressure and volume |
| Answer» E. | |
| 81. |
*$_An ideal liquid refrigerant should? |
| A. | Not have a subatmospheric vapour pressure at the temperature in the refrigerator coils |
| B. | Not have unduly high vapour pressure at the condenser temperature |
| C. | Both A and B |
| D. | Have low specific heat |
| Answer» D. Have low specific heat | |
| 82. |
*$_For an ideal liquid solution, which of the following is unity?? |
| A. | Activity |
| B. | Fugacity |
| C. | Activity co-efficient |
| D. | Fugacity co-efficient |
| Answer» D. Fugacity co-efficient | |
| 83. |
*$_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 | |
| 84. |
*$_Reduced pressure of a gas is the ratio of its? |
| A. | Pressure to critical pressure |
| B. | Critical pressure to pressure |
| C. | Pressure to pseudocritical pressure |
| D. | Pseudocritical pressure to pressure |
| Answer» B. Critical pressure to pressure | |
| 85. |
*$_As the temperature is lowered towards the absolute zero, the value of the quantity (‚à ÇŒîF/‚à ÇT) approaches? |
| A. | Zero |
| B. | Unity |
| C. | Infinity |
| D. | None of these |
| Answer» B. Unity | |
| 86. |
*$_Which of the following is a thermodynamic property of a system?? |
| A. | Concentration |
| B. | Mass |
| C. | Temperature |
| D. | Entropy |
| Answer» E. | |
| 87. |
*$_Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be? |
| A. | Same |
| B. | Doubled |
| C. | Halved |
| D. | One fourth of its original value |
| Answer» B. Doubled | |
| 88. |
*$_Molar heat capacity of water in equilibrium with ice at constant pressure is __________ Kcal/kg mole . °K? |
| A. | 0 |
| B. | ‚à û |
| C. | 50 |
| D. | 100 |
| Answer» C. 50 | |
| 89. |
*$_For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system __________ as its mole fraction increases.? |
| A. | Decreases |
| B. | Increases |
| C. | Remains same |
| D. | Decreases linearly |
| Answer» C. Remains same | |
| 90. |
*$_Requisites of a reversible process is that the? |
| A. | System and surroundings pressure be equal |
| B. | Friction in the system should be absent |
| C. | System and surroundings temperature be equal |
| D. | None of these |
| Answer» C. System and surroundings temperature be equal | |
| 91. |
*$_Entropy change for an irreversible isolated system is? |
| A. | ‚à û |
| B. | 0 |
| C. | < 0 |
| D. | > 0 |
| Answer» E. | |
| 92. |
*$_"The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture". This is? |
| A. | The statement as per Gibbs-Helmholtz |
| B. | Called Lewis-Randall rule |
| C. | Henry's law |
| D. | None of these |
| Answer» C. Henry's law | |
| 93. |
*$_Heating of water under atmospheric pressure is an __________ process.? |
| A. | Isochoric |
| B. | Isobaric |
| C. | Adiabatic |
| D. | Isothermal |
| Answer» C. Adiabatic | |
| 94. |
*$_The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be? |
| A. | More |
| B. | Less |
| C. | Same |
| D. | Data insufficient to predict |
| Answer» B. Less | |
| 95. |
*$_A Carnot cycle consists of the following steps :? |
| A. | Two isothermals and two isentropics |
| B. | Two isobarics and two isothermals |
| C. | Two isochorics and two isobarics |
| D. | Two isothermals and two isochorics |
| Answer» B. Two isobarics and two isothermals | |
| 96. |
*/*_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 | |
| 97. |
*/*_Adiabatic compression of a saturated water vapour makes it? |
| A. | Supersaturated |
| B. | Superheated |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» C. Both A and B | |
| 98. |
*/*_Number of phases in a colloidal system are? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 99. |
*/*_Compressibility factor for almost all the gases are approximately same at the same? |
| A. | Pressure and temperature |
| B. | Reduced pressure and reduced temperature |
| C. | Critical pressure and critical temperature |
| D. | None of these |
| Answer» C. Critical pressure and critical temperature | |
| 100. |
*/*_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. | |