New Thermodynamics MCQs – Latest Chemical Engineering MCQs
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Latest Chemical Engineering MCQs
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Latest Thermodynamics Mcqs
The most occurred mcqs of Thermodynamics in past papers. Past papers of Thermodynamics Mcqs. Past papers of Thermodynamics Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Thermodynamics Mcqs. The Important series of Thermodynamics Mcqs are given below:
Free energy___________________?
A. Decreases in all spontaneous (or irreversible) processes
B. Remains unchanged in reversible processes carried at constant temperature and pressure
C. Change during a spontaneous process has a negative value
D. All A, B. and C
Answer: Option B 392. Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the temperature should be raised to _____________ °C?
A. 300
B. 327
C. 270
D. 540
The change in Gibbs free energy for vaporisation of a pure substance is___________________?
A. Negative
B. Positive
C. Zero
D. May be positive or negative
In any spontaneous process, ?
A. Only A decreases
B. Only F decreases
C. Both F and A decreases
D. Both F and A increase
The partial pressure of each constituent present in an alloy is _____________ the total vapor pressure exerted by the alloy?
A. Less than
B. More than
C. Equal to
D. Either B. or C; depends on the type of alloy
In which of the following reaction equilibrium, the value of equilibrium constant Kp will be more than is Kc ?
A. 2SO2 + O2 ⇌ 2SO3
B. N2O4 ⇌ 2NO2
C. 2HI ⇌ H2 + I2
D. None of these
Thermodynamics Mcqs
In case of steady flow compression polytropic process (PVn = constant), the work done on air is the lowest, when_______________?
A. n = 0
B. n = y = 1.4
C. n = 1
D. n = 1.66
A/an ____________ system is exemplified by a vessel containing a volatile liquid in contact with its vapor?
A. Closed
B. Isolated
C. Open
D. None of these
Which of the following is a widely used refrigerant in vapour compression refrigeration system (using large centrifugal compressor) ?
A. Freon
B. Liquid sulphur dioxide
C. Ammonia
D. Methyl chloride
(∂E/∂T)V is the mathematical expression for____________________?
A. Enthalpy change
B. CV
C. Free energy change
D. None of these
Fugacity of a component in an ideal gas mixture is equal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at constant pressure and temperature ____________ as its mole fraction increases?
A. Decreases exponentially
B. Decreases
C. Increases
D. Remain constant
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 positive
B. (atm)Δx, when Δx is negative
C. Dimensionless, when Δx = 0
D. (atm)Δx2, when Δx > 0
dW and dq are not the exact differential, because q and W are__________________?
A. Intensive properties
B. Path functions
C. State functions
D. Extensive properties
The expression for entropy change given by, ΔS = – nR ln (P2/P1), holds good for___________________?
A. Heating of an ideal gas
B. Reversible isothermal volume change
C. Expansion of a real gas
D. Cooling of a real gas
PVγ = Constant (where, γ = Cp/Cv) is valid for a/an ______________ process?
A. Isentropic
B. Isothermal
C. Isobaric
D. Adiabatic
Heat is added at constant pressure in an ideal _____________ cycle?
A. Stirling
B. Rankine
C. Brayton
D. Both B. and C
For the reversible exothermic reaction, N2 + 3H2 ⇌ 2NH3, increase of pressure would________________?
A. Give higher yield of NH3
B. Shift the equilibrium towards right
C. Both B. and C
D. Neither A. nor B
The free energy change for a chemical reaction is given by (where, K = equilibrium constant)________________?
A. -R ln K
B. -RT ln K
C. RT ln K
D. T ln K
For a real gas, the chemical potential is given by_____________________?
A. R d ln f
B. RT d ln f
C. RT d ln P
D. None of these
Minimum number of phases that exists in a system is 1. Number of chemical species in a colloidal system is__________________?
A. 3
B. 2
C. 1
D. 4
The expression for entropy change, ΔS = n Cp . ln (T2/T1), is valid for the ______________ of a substance?
A. Simultaneous pressure & temperature change
B. Cooling
C. Heating
D. Both B. and C
Internal energy is equal to the heat absorbed in case of a/an ______________ process?
A. Constant volume
B. Adiabatic
C. Polytropic
D. Constant pressure
Process Control And Instrumentation Mcqs
For an ideal liquid solution, which of the following is unity ?
A. Fugacity
B. Activity
C. Activity co-efficient
D. Fugacity co-efficient
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 pressure should be same in the two phases
C. The temperature of each phase should be same
D. The chemical potential of each component should be same in the two phases
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. Gibbs-Helmholtz
C. Van Laar
D. Margules
Equilibrium constant decreases as the temperature___________________?
A. Increases, for an exothermic reaction
B. Increases, for an endothermic reaction
C. Decreases, for an exothermic reaction
D. None of these
The main feature of Carnot refrigeration cycle is that, it________________________?
A. Transfers heat from high temperature to low temperature
B. Does not need the addition of external work for its functioning
C. Accomplishes the reverse effect of the heat engine
D. None of these
In a homogeneous solution, the activity co-efficient of a component depends upon the_________________?
A. Composition
B. Pressure
C. Temperature
D. All (A), B. and (C)
Pick out the wrong statement ?
A. At constant pressure, solubility of a gas in a liquid diminishes with rise in temperature
B. At constant pressure, solubility of a gas in a liquid increases with rise in temperature
C. The gases which are capable of forming ions in aqueous solution are much more soluble in water than in other solvents
D. Normally, the gases which are easily liquefied are more soluble in common solvents
Heating of water under atmospheric pressure is an ______________ process?
A. Adiabatic
B. Isobaric
C. Isochoric
D. Isothermal
If we increase the pressure on a substance (which is at its triple point), then the triple point __________________?
A. Decreases
B. Increases
C. Remains unchanged
D. May increase or decrease; depends on the substance
Degree of freedom of the system ice-water-vapour will be ________________?
A. 0
B. 2
C. 1
D. 3
Filling of gas from a high pressure cylinder into small bottles is an example of a/an ______________ process?
A. Adiabatic
B. Equilibrium
C. Steady
D. Unsteady
Pick out the undesirable property for a good refrigerant ?
A. Low freezing point
B. High thermal conductivity
C. Large latent heat of vaporisation
D. High viscosity
If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the _________________?
A. Van Laar equation
B. Clausius-Clapeyron Equation
C. Maxwell’s equation
D. Nernst Heat Theorem
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. 7058.3
B. 6753.5
C. 6738.9
D. 9000
For an ideal gas, the internal energy depends upon its ____________ only?
A. Volume
B. Temperature
C. Molecular size
D. Pressure
The temperature at the eutectic point of the system is the _____________ temperature that can be attained in the system?
A. Lowest
B. Average
C. Highest
D. None of these
The value of Cp & Cv respectively for monatomic gases in Kcal/kg Mole.°K are________________?
A. 5 & 3
B. 1.987 & 0.66
C. 3.987 & 1.987
D. 0.66 & 1.987
Which of the following represents the Virial equation of state ?
A. n1u2 + μ2μ1 = 0
B. PV/RT = 1 + (B/V) + (C/V2) + ……
C. T = [RT/(V- b)] – [a/√T. V(V + b)]
D. None of these
For organic compounds, group contribution method can be used for the estimation of _____________________?
A. Critical properties
B. Specific volume
C. Specific gravity
D. Thermal conductivity
_______________ increases with increase in pressure?
A. The boiling point of a liquid
B. The melting point of wax
C. Both A. and B
D. Neither A. nor B
The enthalpy change when ammonia gas is dissolved in water is called the heat of___________________?
A. Solution
B. Dilution
C. Formation
D. Combustion
Trouton’s ratio is given by (where λb, = molal heat of vaporisation of a substance at its normal boiling point, kcal/kmol Tb = normal boiling point, °K) ___________________?
A. λb/Tb
B. √(λb/Tb)
C. Tb/λb
D. √(Tb/λb)
Joule-Thomson co-efficient depends on the_____________________?
A. Temperature
B. Pressure
C. Both A. & B
D. Neither A. nor B
Which of the following processes cannot be made reversible even under ideal condition of operation ?
A. Free expansion of a gas
B. Expansion of steam in a turbine
C. Compression of air in a compressor
D. All (A), B. & (C)
Chemical Process Mcqs
“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. No gas can be liquefied above the critical temperature, howsoever high the pressure may be.
C. The surface of separation (i. e. the meniscus) between liquid and vapour phase disappears atthe critical temperature
D. The molar heat of energy of gas at constant volume should be nearly constant (about 3 calories)
Internal energy of an element at 1 atm and 25° C is ____________ kcal/kg.mole?
A. 0
B. 25
C. 273
D. None of these
For a constant volume process _____________ by the system is used only to increase the internal energy?
A. Heat absorbed
B. Work done
C. Both of the above
D. Neither of the above
A change in state involving a decrease in entropy can be spontaneous, only if ____________________?
A. It is exothermic
B. It takes place isothermally
C. It is isenthalpic
D. It takes place at constant volume
Specific _____________ does not change during phase change at constant temperature and pressure?
A. Internal energy
B. Gibbs energy
C. Entropy
D. Enthalpy
High _____________ is an undesirable property for a good refrigerant?
A. Latent heat of vaporisation
B. Specific heat
C. Viscosity
D. Specific vapor volume
Which of the following liquid metals has the highest thermal conductivity ?
A. Molten sodium
B. Mercury
C. Molten lead
D. Molten potassium
If heat contents of CH4, C2H4 and C3H8 are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH4(g) + C2H4(g) ⇌ C3H8(g) will be _____________ Kcal?
A. -19.4
B. 55.2
C. -30.2
D. -55.2
Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg. K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is_______________?
A. Superheated vapour
B. Saturated vapour
C. Partially condensed vapour with quality of 0.9
D. Partially condensed vapour with quality of 0.1
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 cooling of an ideal gas
D. During heating of an ideal gas
What is the degree of freedom for two miscible (non-reacting) substances in vapor-liquid equilibrium forming an azeotrope ?
A. 1
B. 0
C. 2
D. 3
For any system, what is the minimum number of degrees of freedom ?
A. 0
B. 2
C. 1
D. 3
At the critical point of a substance____________?
A. Liquid and vapour have the same density
B. The surface tension vanishes
C. There is no distinction between liquid and vapour phases
D. All A, B. and C
The number of degrees of freedom for an azeotropic mixture in a two component vapourliquid equilibria is/are__________________?
A. Two
B. One
C. Zero
D. Three
The freezing point of a liquid decreases when the pressure is increased, if the liquid ____________ while freezing?
A. Contracts
B. Does not change in volume
C. Expands
D. Either (A), B. or (C)
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. V1 – V2
C. V2/V1
D. V1.V2
Molar heat capacity of water in equilibrium with ice at constant pressure is __________ Kcal/kg mole. °K___________________?
A. 50
B. ∞
C. 0
D. 100
In any spontaneous process, the ______________ free energy decreases ?
A. Gibbs
B. Helmholtz
C. Both A. & B.
D. Neither A. nor B.
At 60° C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60° C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is__________________?
A. 1.572
B. 3.389
C. 1.9398
D. 4.238
What is the value of Joule-Thomson co-efficient for an ideal gas ?
A. -ve
B. +ve
C. 0
D. ∞
If atmospheric temperature and dew point are nearly equal, then the relative humidity is_______________?
A. 50%
B. Zero
C. Almost 100%
D. unpredictable
No work is done by the system, when a reaction occurs at constant__________________?
A. Volume
B. Pressure
C. Temperature
D. None of these
Joule-Thomson Co-efficient at any point on the inversion curve is___________________?
A. +ve
B. ∞
C. 0
D. -ve
At absolute zero temperature, the _____________ of the gas is zero?
A. Mass
B. Volume
C. Pressure
D. None of these