Chemical Engineering Thermodynamics MCQ Solved Paper for NDA
Thursday 9th of March 2023
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1. For a cyclic process, a fixed ratio between heat and work
A. Always exists
B. May exist
C. Never exists
D. Is difficult to predict
Answer : A
A. Always exists
B. May exist
C. Never exists
D. Is difficult to predict
Answer : A
2. Which is an example of closed system?
A. Air compressor
B. Liquid cooling system of an automobile
C. Boiler
D. None of these
Answer : B
A. Air compressor
B. Liquid cooling system of an automobile
C. Boiler
D. None of these
Answer : B
3. Pick out the wrong statement.
A. The net change in entropy in any reversible cycle is always zero
B. The entropy of the system as a whole in an irreversible process increases
C. The entropy of the universe tends to a maximum
D. The entropy of a substance does not remain constant during a reversible adiabatic change
Answer : D
A. The net change in entropy in any reversible cycle is always zero
B. The entropy of the system as a whole in an irreversible process increases
C. The entropy of the universe tends to a maximum
D. The entropy of a substance does not remain constant during a reversible adiabatic change
Answer : D
4. Pick out the Clausius-Clapeyron equation from the following:
A. dP/dT = ?H/T?V
B. ln P = - (?H/RT) + constant
C. ?F = ?H + T [?(?F)/?T]P
D. None of these
Answer : B
A. dP/dT = ?H/T?V
B. ln P = - (?H/RT) + constant
C. ?F = ?H + T [?(?F)/?T]P
D. None of these
Answer : B
5. 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 : B
A. 3
B. 1
C. 2
D. 0
Answer : B
6. Entropy change of mixing two liquid substances depends upon the
A. Molar concentration
B. Quantity (i.e. number of moles)
C. Both (A) and (B)
D. Neither (A) nor (B)
Answer : C
A. Molar concentration
B. Quantity (i.e. number of moles)
C. Both (A) and (B)
D. Neither (A) nor (B)
Answer : C
7. The difference between isothermal compressibility and adiabatic compressibility for an ideal gas is
A. 0
B. +ve
C. -ve
D. ?
Answer : B
A. 0
B. +ve
C. -ve
D. ?
Answer : B
8. Specific heat of a gas for a reversible adiabatic process is
A. Negative
B. Zero
C. Infinity
D. None of these
Answer : B
A. Negative
B. Zero
C. Infinity
D. None of these
Answer : B
9. What is the value of Joule-Thomson co-efficient for an ideal gas?
A. +ve
B. -ve
C. 0
D. ?
Answer : C
A. +ve
B. -ve
C. 0
D. ?
Answer : C
10. In case of a close thermodynamic system, there is __________ across the boundaries.
A. No heat and mass transfer
B. No mass transfer but heat transfer
C. Mass and energy transfer
D. None of these
Answer : B
A. No heat and mass transfer
B. No mass transfer but heat transfer
C. Mass and energy transfer
D. None of these
Answer : B
11. Joule-Thomson experiment is
A. Isobaric
B. Adiabatic
C. Isenthalpic
D. Both (B) & (C)
Answer : D
A. Isobaric
B. Adiabatic
C. Isenthalpic
D. Both (B) & (C)
Answer : D
12. Which one is true for a throttling process?
A. A gas may have more than one inversion temperatures
B. The inversion temperature is different for different gases
C. The inversion temperature is same for all gases
D. The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity
Answer : B
A. A gas may have more than one inversion temperatures
B. The inversion temperature is different for different gases
C. The inversion temperature is same for all gases
D. The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity
Answer : B
13. The first law of thermodynamics is a statement of conservation of
A. Heat
B. Momentum
C. Energy
D. Work
Answer : C
A. Heat
B. Momentum
C. Energy
D. Work
Answer : C
14. Pick out the correct statement.
A. Like internal energy and enthalpy, the absolute value of standard entropy for elementary substances is zero
B. Melting of ice involves increase in enthalpy and a decrease in randomness
C. The internal energy of an ideal gas depends only on its pressure
D. Maximum work is done under reversible conditions
Answer : D
A. Like internal energy and enthalpy, the absolute value of standard entropy for elementary substances is zero
B. Melting of ice involves increase in enthalpy and a decrease in randomness
C. The internal energy of an ideal gas depends only on its pressure
D. Maximum work is done under reversible conditions
Answer : D
15. During Joule-Thomson expansion of gases
A. Enthalpy remains constant
B. Entropy remains constant
C. Temperature remains constant
D. None of these
Answer : A
A. Enthalpy remains constant
B. Entropy remains constant
C. Temperature remains constant
D. None of these
Answer : A
16. In the equation, PVn = constant, if the value of n = 1, then it represents a reversible __________ process.
A. Isothermal
B. Isobaric
C. Polytropic
D. Adiabatic
Answer : A
A. Isothermal
B. Isobaric
C. Polytropic
D. Adiabatic
Answer : A
17. On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will
A. Increase
B. Decrease
C. Remain same
D. Increase in summer and will decrease in winter
Answer : A
A. Increase
B. Decrease
C. Remain same
D. Increase in summer and will decrease in winter
Answer : A
18. Compound having large heat of formation is
A. More stable
B. Less stable
C. Not at all stable (like nascent O2)
D. Either more or less stable; depends on the compound
Answer : A
A. More stable
B. Less stable
C. Not at all stable (like nascent O2)
D. Either more or less stable; depends on the compound
Answer : A
19. Heat of formation of an element in its standard state is
A. 0
B. < 0
C. > 0
D. A function of pressure
Answer : A
A. 0
B. < 0
C. > 0
D. A function of pressure
Answer : A
20. Maximum work that could be secured by expanding the gas over a given pressure range is the __________ work.
A. Isothermal
B. Adiabatic
C. Isentropic
D. None of these
Answer : A
A. Isothermal
B. Adiabatic
C. Isentropic
D. None of these
Answer : A
21. Fundamental principle of refrigeration is based on the __________ law of thermodynamics.
A. Zeroth
B. First
C. Second
D. Third
Answer : C
A. Zeroth
B. First
C. Second
D. Third
Answer : C
22. When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change. This is called the
A. Le-Chatelier principle
B. Kopp's rule
C. Law of corresponding state
D. Arrhenius hypothesis
Answer : A
A. Le-Chatelier principle
B. Kopp's rule
C. Law of corresponding state
D. Arrhenius hypothesis
Answer : A
23. It is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions.
A. The amount of work needed is path dependent
B. Work alone cannot bring out such a change of state
C. The amount of work needed is independent of path
D. More information is needed to conclude anything about the path dependence or otherwise of the work needed
Answer : A
A. The amount of work needed is path dependent
B. Work alone cannot bring out such a change of state
C. The amount of work needed is independent of path
D. More information is needed to conclude anything about the path dependence or otherwise of the work needed
Answer : A
24. An isolated system can exchange __________ with its surroundings.
A. Matter
B. Energy
C. Neither matter nor energy
D. Both matter and energy
Answer : C
A. Matter
B. Energy
C. Neither matter nor energy
D. Both matter and energy
Answer : C
25. Pick out the wrong statement.
A. The chemical potential of a pure substance depends upon the temperature and pressure
B. The chemical potential of a component in a system is directly proportional to the escaping tendency of that component
C. The chemical potential of ith species (?i) in an ideal gas mixture approaches zero as the pressure or mole fraction (xi) tends to be zero at constant temperature
D. The chemical potential of species 'i' in the mixture (?i) is mathematically represented as,?i = ?(nG)/?ni]T,P,nj where, n, ni and nj respectively denote the total number of moles, moles of ith species and all mole numbers except ith species. 'G' is Gibbs molar free energy
Answer : C
A. The chemical potential of a pure substance depends upon the temperature and pressure
B. The chemical potential of a component in a system is directly proportional to the escaping tendency of that component
C. The chemical potential of ith species (?i) in an ideal gas mixture approaches zero as the pressure or mole fraction (xi) tends to be zero at constant temperature
D. The chemical potential of species 'i' in the mixture (?i) is mathematically represented as,?i = ?(nG)/?ni]T,P,nj where, n, ni and nj respectively denote the total number of moles, moles of ith species and all mole numbers except ith species. 'G' is Gibbs molar free energy
Answer : C
26. Internal energy change of a system over one complete cycle in a cyclic process is
A. Zero
B. +ve
C. -ve
D. Dependent on the path
Answer : A
A. Zero
B. +ve
C. -ve
D. Dependent on the path
Answer : A
27. An irreversible process
A. Is the analog of linear frictionless motion in machines
B. Is an idealised visualisation of behaviour of a system
C. Yields the maximum amount of work
D. Yields an amount of work less than that of a reversible process
Answer : D
A. Is the analog of linear frictionless motion in machines
B. Is an idealised visualisation of behaviour of a system
C. Yields the maximum amount of work
D. Yields an amount of work less than that of a reversible process
Answer : D
28. Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is - 57°C and 5.2 atm).
A. Pressure must be kept below 5.2 atm
B. Temperature must be kept above - 57°C
C. Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C
D. Pressure and temperature must be kept below 5.2 atm. and - 57°C respectively
Answer : D
A. Pressure must be kept below 5.2 atm
B. Temperature must be kept above - 57°C
C. Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C
D. Pressure and temperature must be kept below 5.2 atm. and - 57°C respectively
Answer : D
29. A gas can be liquefied by pressure alone only, when its temperature is __________ its critical temperature.
A. Less than
B. More than
C. Equal to or higher than
D. Less than or equal to
Answer : D
A. Less than
B. More than
C. Equal to or higher than
D. Less than or equal to
Answer : D
30. 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. Partially condensed vapour with quality of 0.9
C. Saturated vapour
D. Partially condensed vapour with quality of 0.1
Answer : A
A. Superheated vapour
B. Partially condensed vapour with quality of 0.9
C. Saturated vapour
D. Partially condensed vapour with quality of 0.1
Answer : A
31. In the equation, PVn = Constant, if the value of n = 0, then it represents a reversible __________ process.
A. Isobaric
B. Isothermal
C. Isentropic
D. Isometric
Answer : A
A. Isobaric
B. Isothermal
C. Isentropic
D. Isometric
Answer : A
32. In the reaction, C + O2 ? CO2; ?H = - 94 kcal. What is the heat content (enthalpy) of O2?
A. -94 kcal
B. > -94 kcal
C. < - 94 kcal
D. Zero
Answer : D
A. -94 kcal
B. > -94 kcal
C. < - 94 kcal
D. Zero
Answer : D
33. For an ideal gas, the chemical potential is given by
A. RT d ln P
B. R d ln P
C. R d ln f
D. None of these
Answer : A
A. RT d ln P
B. R d ln P
C. R d ln f
D. None of these
Answer : A
34. Ideal refrigeration cycle is
A. Same as Carnot cycle
B. Same as reverse Carnot cycle
C. Dependent on the refrigerant's properties
D. The least efficient of all refrigeration processes
Answer : B
A. Same as Carnot cycle
B. Same as reverse Carnot cycle
C. Dependent on the refrigerant's properties
D. The least efficient of all refrigeration processes
Answer : B
35. 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. Methyl chloride
D. Ammonia
Answer : A
A. Freon
B. Liquid sulphur dioxide
C. Methyl chloride
D. Ammonia
Answer : A
36. 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 P1 and P2. (where, P1 and P2 are initial and final pressures respectively)
A. Logarithmic
B. Arithmetic
C. Geometric
D. Harmonic
Answer : C
A. Logarithmic
B. Arithmetic
C. Geometric
D. Harmonic
Answer : C
37. Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture __________ calorimeter is not used for measuring the dryness fraction of steam.
A. Bomb
B. Separating
C. Bucket
D. Throttling
Answer : A
A. Bomb
B. Separating
C. Bucket
D. Throttling
Answer : A
38. A cylinder contains 640 gm of liquid oxygen. The volume occupied (in litres) by the oxygen, when it is released and brought to standard conditions (0°C, 760 mm Hg) will be __________ litres.
A. 448
B. 224
C. 22.4
D. Data insufficient; can't be computed
Answer : A
A. 448
B. 224
C. 22.4
D. Data insufficient; can't be computed
Answer : A
39. Henry's law is closely obeyed by a gas, when its __________ is extremely high.
A. Pressure
B. Solubility
C. Temperature
D. None of these
Answer : D
A. Pressure
B. Solubility
C. Temperature
D. None of these
Answer : D
40. Compressibility factor of a gas is
A. Not a function of its pressure
B. Not a function of its nature
C. Not a function of its temperature
D. Unity, if it follows PV = nRT
Answer : A
A. Not a function of its pressure
B. Not a function of its nature
C. Not a function of its temperature
D. Unity, if it follows PV = nRT
Answer : A
41. In a working refrigerator, the value of COP is always
A. 0
B. < 0
C. < 1
D. > 1
Answer : D
A. 0
B. < 0
C. < 1
D. > 1
Answer : D
42. Pick out the wrong statement.
A. An ideal liquid or solid solution is defined as one in which each component obeys Raoult's law
B. If Raoult's law is applied to one component of a binary mixture; Henry's law or Raoult's law is applied to the other component also
C. Henry's law is rigorously correct in the limit of infinite dilution
D. None of these
Answer : D
A. An ideal liquid or solid solution is defined as one in which each component obeys Raoult's law
B. If Raoult's law is applied to one component of a binary mixture; Henry's law or Raoult's law is applied to the other component also
C. Henry's law is rigorously correct in the limit of infinite dilution
D. None of these
Answer : D
43. Fugacity and pressure are numerically not equal for the gases
A. At low temperature and high pressure
B. At standard state
C. Both (A) and (B)
D. In ideal state
Answer : C
A. At low temperature and high pressure
B. At standard state
C. Both (A) and (B)
D. In ideal state
Answer : C
44. 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 : A
A. V1/V2
B. V2/V1
C. V1 - V2
D. V1.V2
Answer : A
45. 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 : C
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 : C
46. For the gaseous phase chemical reaction, C2H4(g) + H2O(g) ? C2H5OH(g), the equilibrium conversion does not depend on the
A. Steam to ethylene ratio
B. Temperature
C. Pressure
D. None of these
Answer : D
A. Steam to ethylene ratio
B. Temperature
C. Pressure
D. None of these
Answer : D
47. Pick out the wrong statement.
A. Cp of monatomic gases such as metallic vapor is about 5 kcal/kg.atom
B. The heat capacity of solid inorganic substance is exactly equal to the heat capacity of the substance in the molten state
C. There is an increase in entropy, when a spontaneous change occurs in an isolated system
D. At absolute zero temperature, the heat capacity for many pure crystalline substances is zero
Answer : B
A. Cp of monatomic gases such as metallic vapor is about 5 kcal/kg.atom
B. The heat capacity of solid inorganic substance is exactly equal to the heat capacity of the substance in the molten state
C. There is an increase in entropy, when a spontaneous change occurs in an isolated system
D. At absolute zero temperature, the heat capacity for many pure crystalline substances is zero
Answer : B
48. Which of the following is not an extensive property?
A. Free energy
B. Entropy
C. Refractive index
D. None of these
Answer : C
A. Free energy
B. Entropy
C. Refractive index
D. None of these
Answer : C
49. 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 : D
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 : D
50. At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be
A. More
B. Less
C. Same
D. More or less; depending on the system
Answer : C
A. More
B. Less
C. Same
D. More or less; depending on the system
Answer : C
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