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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.
| 51. |
The equation = - is applicable to infinitesimal changes occuring in |
| A. | an open system of constant composition. |
| B. | a closed system of constant composition. |
| C. | an open system with changes in composition. |
| D. | a closed system with changes in composition. |
| Answer» E. | |
| 52. |
The equation, - = , is true for __________ gas. |
| A. | no |
| B. | any real |
| C. | only ideal |
| D. | both (b) and (c) |
| Answer» D. both (b) and (c) | |
| 53. |
A two stage compressor is used to compress an ideal gas. The gas is cooled to the initial temperature after each stage. The intermediate pressure for the minimum total work requirement should be equal to the __________ mean of and .(where, and are initial and final pressures respectively) |
| A. | logarithmic |
| B. | arithmetic |
| C. | geometric |
| D. | harmonic |
| Answer» D. harmonic | |
| 54. |
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 | |
| 55. |
Joule-Thomson effect .., a throttling process is a constant __________ process. |
| A. | entropy |
| B. | temperature |
| C. | internal energy |
| D. | enthalpy |
| Answer» E. | |
| 56. |
In the equation, = Constant, if the value of = 0, then it represents a reversible __________ process. |
| A. | isobaric |
| B. | isothermal |
| C. | isentropic |
| D. | isometric |
| Answer» B. isothermal | |
| 57. |
The reaction () () is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of and the other a vapor phase of , and . Initially alone is present. The number of degrees of freedom are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» C. 3 | |
| 58. |
- = is valid for __________ gases. |
| A. | ideal |
| B. | all |
| C. | very high pressure |
| D. | very low temperature |
| Answer» B. all | |
| 59. |
Specific __________ does not change during a phase change (.. sublimation, melting, vaporisation etc.). |
| A. | entropy |
| B. | internal energy |
| C. | enthalpy |
| D. | Gibbs free energy |
| Answer» E. | |
| 60. |
In the equation, = constant, if the value of = 1, then it represents a reversible __________ process. |
| A. | isothermal |
| B. | isobaric |
| C. | polytropic |
| D. | adiabatic |
| Answer» B. isobaric | |
| 61. |
For the gaseous phase chemical reaction, CH(g) + HO(g) CHOH(g), the equilibrium conversion does not depend on the |
| A. | steam to ethylene ratio. |
| B. | temperature. |
| C. | pressure. |
| D. | none of these. |
| Answer» E. | |
| 62. |
If the molar heat capacities ( or ) 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. |
In the reaction; N + O 2NO, increasing the pressure will result in |
| A. | shifting the equilibrium towards right, |
| B. | shifting the equilibrium towards left. |
| C. | no change in equilibrium condition. |
| D. | none of these. |
| Answer» D. none of these. | |
| 64. |
Gibbs free energy () is represented by, = - , whereas Helmholtz free energy, () is given by, = - . Which of the following is the Gibbs-Helmholtz equation |
| A. | both (a) and (b) |
| B. | neither (a) nor (b) |
| Answer» D. | |
| 65. |
Forward reaction will be favoured for the exothermic reaction, represented by CO + HO CO + H, by |
| A. | low temperature and high pressure. |
| B. | low temperature and low pressure. |
| C. | high temperature and high pressure. |
| D. | high temperature and low pressure. |
| Answer» B. low temperature and low pressure. | |
| 66. |
The value of & respectively for monoatomic 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 | |
| 67. |
As the temperature is lowered towards the absolute zero, the value of, then approaches |
| A. | unity |
| B. | zero |
| C. | that of the heat of reaction |
| D. | infinity |
| Answer» C. that of the heat of reaction | |
| 68. |
In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13°C and 37°C respetively, the Carnot COP will be |
| A. | 5.2 |
| B. | 6.2 |
| C. | 0.168 |
| D. | data insufficient, can't be found out |
| Answer» B. 6.2 | |
| 69. |
The compressibility factor of a gas is given by (where, = actual volume of the gas = gas volume predicted by ideal gas law ) |
| A. | / |
| B. | / |
| C. | - |
| D. | . |
| Answer» B. / | |
| 70. |
The expression, ( - ), is for the __________ of an ideal gas. |
| A. | work done under adiabatic condition |
| B. | co-efficient of thermal expansion |
| C. | compressibility |
| D. | none of these |
| Answer» B. co-efficient of thermal expansion | |
| 71. |
At normal boiling point, molar entropy of vaporisation is __________ Joule/K°.mole. |
| A. | 72 |
| B. | 92 |
| C. | 142 |
| D. | 192 |
| Answer» C. 142 | |
| 72. |
The expression for entropy change, Δ = . ln (/), is valid for the __________ of a substance. |
| A. | simultaneous pressure & temperature change |
| B. | heating |
| C. | cooling |
| D. | both (b) and (c) |
| Answer» E. | |
| 73. |
For equilibrium process (.. reversible) in an isolated system |
| A. | = 0 |
| B. | < 0 |
| C. | > 0 |
| D. | = Constant |
| Answer» B. < 0 | |
| 74. |
The specific heat of saturated water vapour at 100°C is |
| A. | ∞ |
| B. | -ve |
| C. | 0 |
| D. | +ve |
| Answer» C. 0 | |
| 75. |
Translational kinetic energy of molecules of an ideal gas is proportional to (where, = absolute temperature of the gas ) |
| A. | 1/ |
| Answer» B. | |
| 76. |
For water at 300°C, it has a vapour pressure 8592.7 kPa and fugacity 6738.9 kPa Under these conditions, one mole of water in liquid phase has a volume of 25.28 cm and that in vapour phase in 391.1 cm.Fugacity of water (in kPa) at 9000 kPa will be |
| A. | 6738.9 |
| B. | 6753.5 |
| C. | 7058.3 |
| D. | 9000 |
| Answer» C. 7058.3 | |
| 77. |
Which is not constant for an ideal gas ? |
| A. | all (a), (b) & (c) |
| Answer» B. | |
| 78. |
In case of a reversible process (following = constant), work obtained for trebling the volume ( = 1 m and 3 m ) is max imum, when the value of '' is |
| A. | 0 |
| B. | 1 |
| C. | = 1.44 |
| D. | 1.66 |
| Answer» B. 1 | |
| 79. |
= Constant (where, γ = /) is valid for a/an __________ process. |
| A. | isothermal |
| B. | isentropic |
| C. | isobaric |
| D. | adiabatic |
| Answer» E. | |
| 80. |
The equation relating , , and which is true for all substanes under all conditions is given by .This equation is called the |
| A. | Maxwell's equation. |
| B. | thermodynamic equation of state. |
| C. | equation of state. |
| D. | Redlich-Kwong equation of state. |
| Answer» C. equation of state. | |
| 81. |
For the reversible exothermic reaction, N + 3H 2NH, increase of pressure would |
| A. | shift the equilibrium towards right. |
| B. | give higher yield of NH |
| C. | . |
| D. | both (b) and (c). |
| E. | neither (a) nor (b). |
| Answer» D. both (b) and (c). | |
| 82. |
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. | |
| 83. |
A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg. K. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg , K is |
| A. | -1.87 |
| B. | 0 |
| C. | 1.26 |
| D. | 3.91 |
| Answer» C. 1.26 | |
| 84. |
and are not the exact differential, because and are |
| A. | state functions |
| B. | path functions |
| C. | intensive properties |
| D. | extensive properties |
| Answer» C. intensive properties | |
| 85. |
The four properties of a system . , , , are related by __________ equation. |
| A. | Gibbs-Duhem |
| B. | Gibbs-Helmholtz |
| C. | Maxwell's |
| D. | none of these |
| Answer» D. none of these | |
| 86. |
The unity of Planck's constant '' in the equation, = is |
| A. | J/s |
| B. | J.S |
| C. | J/kmol |
| D. | kmol/J |
| Answer» C. J/kmol | |
| 87. |
In case of steady flow compression polytropic process ( = constant), the work done on air is the lowest, when |
| A. | = |
| B. | = 1.4 |
| C. | = 0 |
| D. | = 1 |
| E. | = 1.66 |
| Answer» D. = 1 | |
| 88. |
Which of the following diagrams does not represent an Otto cycle ? |
| A. | none of these |
| Answer» D. | |
| 89. |
Grams of butane (CH) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be |
| A. | 580 |
| B. | 640 |
| C. | 1160 |
| D. | data insufficient; can't be computed |
| Answer» D. data insufficient; can't be computed | |
| 90. |
The thermodynamic law, = 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. | |
| 91. |
What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, (where, and are source & surrounding temperatures respectively.)? |
| A. | none of these |
| Answer» B. | |
| 92. |
An ideal gas is taken around the cycle ABCA as shown in - diagram below :The work done by the gas during the cycle is equal to |
| A. | 12 |
| B. | 6 |
| C. | |
| D. | 3 |
| E. | |
| Answer» D. 3 | |
| 93. |
In polytropic process ( = constant), if = 1; it means a/an __________ process. |
| A. | adiabatic |
| B. | reversible |
| C. | isothermal |
| D. | none of these |
| Answer» D. none of these | |
| 94. |
A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1 , K-1 is |
| A. | -1.87 |
| B. | 0 |
| C. | 1.26 |
| D. | 3.91 |
| Answer» C. 1.26 | |
| 95. |
For water at 300°C, it has a vapour pressure 8592.7 kPa and fugacity 6738.9 kPa Under these conditions, one mole of water in liquid phase has a volume of 25.28 cm3 and that in vapour phase in 391.1 cm3.Fugacity of water (in kPa) at 9000 kPa will be |
| A. | 6738.9 |
| B. | 6753.5 |
| C. | 7058.3 |
| D. | 9000 |
| Answer» C. 7058.3 | |
| 96. |
On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)s and the slope of the reversible isothermal line (∂P/∂V)T are related as (where, y = Cp/Cv) |
| A. | (∂P/∂V)S = (∂P/∂V)T |
| B. | (∂P/∂V)S = [(∂P/∂V)T]Y |
| C. | (∂P/∂V)S = y(∂P/∂V)T |
| D. | (∂P/∂V)S = 1/y(∂P/∂V)T |
| Answer» D. (∂P/∂V)S = 1/y(∂P/∂V)T | |
| 97. |
A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then(where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively) |
| A. | Δ S1 is always < Δ SR |
| B. | Δ S1 is sometimes > Δ SR |
| C. | Δ S1 is always > Δ SR |
| D. | Δ S1 is always = Δ SR |
| Answer» D. Δ S1 is always = Δ SR | |
| 98. |
Maxwell's relation corresponding to the identity, dH = dS = Vdp + ∑μi dni is |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | [D]. |
| Answer» E. | |
| 99. |
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 | |
| 100. |
The chemical potential of a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of sustance added for an infinitesimal addition at constant temperature and pressure. It is given by |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | all (a), (b) and (c) |
| Answer» E. | |