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.
| 101. |
“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 | |
| 102. |
The freezing point of a liquid decreases when the pressure is increased, if the liquid ____________ while freezing? |
| A. | Contracts |
| B. | Expands |
| C. | Does not change in volume |
| D. | Either (A), B. or (C) |
| Answer» B. Expands | |
| 103. |
The free energy change for a chemical reaction is given by (where, K = equilibrium constant)________________? |
| A. | RT ln K |
| B. | -RT ln K |
| C. | -R ln K |
| D. | T ln K |
| Answer» C. -R ln K | |
| 104. |
The four properties of a system viz. P, V, T, S are related by ______________ equation? |
| A. | Gibbs-Duhem |
| B. | Gibbs-Helmholtz |
| C. | Maxwell’s |
| D. | None of these |
| Answer» D. None of these | |
| 105. |
The following heat engine produces power of 100,000 kW. The heat engine operates between 800 K and 300 K. It has a thermal efficiency equal to 50% of that of the Carnot engine for the same temperature. The rate at which heat is absorbed from the hot reservoir is____________________? |
| A. | 100,000 kW |
| B. | 160,000 kW |
| C. | 200,000 kW |
| D. | 320,000 kW |
| Answer» E. | |
| 106. |
The first law of thermodynamics is a statement of conservation of_____________________? |
| A. | Heat |
| B. | Momentum |
| C. | Energy |
| D. | Work |
| Answer» D. Work | |
| 107. |
The first law of thermodynamics is a restatement of the law of conservation of_________________? |
| A. | Mass |
| B. | Energy |
| C. | Momentum |
| D. | None of these |
| Answer» C. Momentum | |
| 108. |
The extensive properties are____________________? |
| A. | Volume, mass and number of moles |
| B. | Free energy, entropy and enthalpy |
| C. | Both A. and B |
| D. | None of these |
| Answer» D. None of these | |
| 109. |
The expression, nCv(T2 – T1), 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 | |
| 110. |
The expression, nRT ln(P1/P2), is for the _____________of an ideal gas? |
| A. | Compressibility |
| B. | Work done under adiabatic condition |
| C. | Work done under isothermal condition |
| D. | Co-efficient of thermal expansion |
| Answer» D. Co-efficient of thermal expansion | |
| 111. |
The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible _____________ process? |
| A. | Isobaric |
| B. | Isothermal |
| C. | Adiabatic |
| D. | None of these |
| Answer» C. Adiabatic | |
| 112. |
The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCv ln (T2/T1) is valid for ______________________? |
| A. | Reversible isothermal volume change |
| B. | Heating of a substance |
| C. | Cooling of a substance |
| D. | Simultaneous heating and expansion of an ideal gas |
| Answer» E. | |
| 113. |
The expression, ΔG = nRT. ln(P2/P1), gives the free energy change______________? |
| A. | With pressure changes at constant temperature |
| B. | Under reversible isothermal volume change |
| C. | During heating of an ideal gas |
| D. | During cooling of an ideal gas |
| Answer» B. Under reversible isothermal volume change | |
| 114. |
The expression for entropy change, ΔS = n Cp . ln (T2/T1), is valid for the ______________ of a substance? |
| A. | Simultaneous pressure & temperature change |
| B. | Heating |
| C. | Cooling |
| D. | Both B. and C |
| Answer» E. | |
| 115. |
The expression for entropy change given by, ΔS = – nR ln (P2/P1), holds good for___________________? |
| A. | Expansion of a real gas |
| B. | Reversible isothermal volume change |
| C. | Heating of an ideal gas |
| D. | Cooling of a real gas |
| Answer» C. Heating of an ideal gas | |
| 116. |
The equilibrium constant for a chemical reaction at two different temperatures is given by__________________? |
| A. | Kp2/Kp1 = – (ΔH/R) (1/T2 – 1/T1) |
| B. | Kp2/Kp1 = (ΔH/R) (1/T2 – 1/T1) |
| C. | Kp2/Kp1 = ΔH (1/T2 – 1/T1) |
| D. | Kp2/Kp1 = – (1/R) (1/T2 – 1/T1) |
| Answer» B. Kp2/Kp1 = (ΔH/R) (1/T2 – 1/T1) | |
| 117. |
The equation Tds = dE – PdV applies to___________________? |
| A. | Single phase fluid of varying composition |
| B. | Single phase fluid of constant composition |
| C. | Open as well as closed systems |
| D. | Both B. and C |
| Answer» E. | |
| 118. |
The equation relating E, P, V and T which is true for all substances under all conditions is given by (∂E/∂V)T = T(∂P/∂T)H – P. 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 | |
| 119. |
The equation, PV = nRT, is best obeyed by gases at____________________? |
| A. | Low pressure & high temperature |
| B. | High pressure & low temperature |
| C. | Low pressure & low temperature |
| D. | None of these |
| Answer» B. High pressure & low temperature | |
| 120. |
The equation DU = Tds – PdV 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. | |
| 121. |
The equation, (d loge PA/d loge xA) = (d loge PA/d loge xB) 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. | |
| 122. |
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. | |
| 123. |
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 | |
| 124. |
The enthalpy change when ammonia gas is dissolved in water is called the heat of___________________? |
| A. | Solution |
| B. | Formation |
| C. | Dilution |
| D. | Combustion |
| Answer» B. Formation | |
| 125. |
The energy of activation of exothermic reaction is_________________? |
| A. | Zero |
| B. | Negative |
| C. | Very large compared to that for endothermic reaction |
| D. | Not possible to predict |
| Answer» E. | |
| 126. |
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 | |
| 127. |
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) | |
| 128. |
The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is__________________? |
| A. | Less pronounced |
| B. | More pronounced |
| C. | Equal |
| D. | Data insufficient, can’t be predicted |
| Answer» C. Equal | |
| 129. |
The difference between isothermal compressibility and adiabatic compressibility for an ideal gas is____________________? |
| A. | 0 |
| B. | +ve |
| C. | -ve |
| D. | ∞ |
| Answer» C. -ve | |
| 130. |
The compressibility factor of a gas is given by (where, V1 = actual volume of the gas V2 = gas volume predicted by ideal gas law)____________________? |
| A. | V1/V2 |
| B. | V2/V1 |
| C. | V1 – V2 |
| D. | V1.V2 |
| Answer» B. V2/V1 | |
| 131. |
The compressibility factor for an ideal gas is 1. Its value for any other real gas is_______________? |
| A. | 1 |
| B. | < 1 |
| C. | > 1 |
| D. | Either (b) or (c), depends on the nature of the gas |
| Answer» E. | |
| 132. |
The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of _____________ and COP are the same? |
| A. | Kinematic viscosity |
| B. | Work |
| C. | Temperature |
| D. | None of these |
| Answer» E. | |
| 133. |
The chemical potential of any constituent of an ideal solution depends on the ______________ of the solution? |
| A. | Temperature |
| B. | Pressure |
| C. | Composition |
| D. | All (A), B. and (C) |
| Answer» E. | |
| 134. |
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 substance added for an infinitesimal addition at constant temperature and pressure. It is given by_________________? |
| A. | (∂E/∂ni)S, v, nj |
| B. | (∂G/∂ni)T, P, nj = (∂A/∂ni) T, v, nj |
| C. | (∂H/∂ni)S, P, nj |
| D. | All (A), B. and (C) |
| Answer» E. | |
| 135. |
The chemical potential for a pure substance is ____________ its partial molal free energy? |
| A. | More than |
| B. | Less than |
| C. | Equal to |
| D. | Not related to |
| Answer» D. Not related to | |
| 136. |
The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition? |
| A. | Internal energy |
| B. | Enthalpy |
| C. | Gibbs free energy |
| D. | Helmholtz free energy |
| Answer» D. Helmholtz free energy | |
| 137. |
The change in Gibbs free energy for vaporisation of a pure substance is___________________? |
| A. | Positive |
| B. | Negative |
| C. | Zero |
| D. | May be positive or negative |
| Answer» D. May be positive or negative | |
| 138. |
The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is__________________? |
| A. | Less |
| B. | More |
| C. | Same |
| D. | Dependent on climatic conditions |
| Answer» B. More | |
| 139. |
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 | |
| 140. |
The ammonia synthesis reaction represented by N2 + 3H2 ⇌ 2NH3; ΔH = – 22.4 kcal, is__________________? |
| A. | Endothermic |
| B. | Exothermic |
| C. | Isothermal |
| D. | Adiabatic |
| Answer» C. Isothermal | |
| 141. |
The adiabatic throttling process of a perfect gas is one of constant enthalpy_________________? |
| A. | In which there is a temperature drop |
| B. | Which is exemplified by a non-steady flow expansion |
| C. | Which can be performed in a pipe with a constriction |
| D. | In which there is an increase in temperature |
| Answer» D. In which there is an increase in temperature | |
| 142. |
The activity of an ideal gas is numerically ____________ its pressure? |
| A. | More than |
| B. | Less than |
| C. | Equal to |
| D. | Data insufficient, can’t be predicted |
| Answer» D. Data insufficient, can’t be predicted | |
| 143. |
Second law of thermodynamics is concerned with the_________________? |
| A. | Amount of energy transferred |
| B. | Direction of energy transfer |
| C. | Irreversible processes only |
| D. | Non-cyclic processes only |
| Answer» C. Irreversible processes only | |
| 144. |
Rotary lime kiln is an example of a/an _____________ system? |
| A. | Closed |
| B. | Open |
| C. | Isolated |
| D. | Non-thermodynamic |
| Answer» C. Isolated | |
| 145. |
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 | |
| 146. |
Refrigeration cycle_________________? |
| A. | Violates second law of thermodynamics |
| B. | Involves transfer of heat from low temperature to high temperature |
| C. | Both A. and B |
| D. | Neither A. nor B |
| Answer» C. Both A. and B | |
| 147. |
Refrigeration capacity of a household refrigerator may be round about _____________ tons? |
| A. | 0.15 |
| B. | 1.5 |
| C. | 4.5 |
| D. | 6.5 |
| Answer» B. 1.5 | |
| 148. |
Refrigerants commonly used for domestic refrigerators are_________________? |
| A. | Ethyl chloride or methyl chloride |
| B. | Freon-12 |
| C. | Propane |
| D. | NH3 or CO2 |
| Answer» B. Freon-12 | |
| 149. |
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 | |
| 150. |
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 | |