chemical engineering thermodynamics for chemical chemical engineering MCQs – Page 3

Practise multiple-choice questions from chemical engineering thermodynamics for chemical chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering thermodynamics for chemical chemical engineering Mcqs
41. Entropy change for an irreversible process taking system and surrounding together is___________________?
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A. 0

B. None of these

C. > 0

D. < 0

42. At constant temperature and pressure, for one mole of a pure substance, the ratio of the free energy to the chemical potential is____________________?
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A. Negative

B. Zero

C. Infinity

D. One
43. One mole of nitrogen at 8 bar and 600 K is contained in a piston-cylinder arrangement. It is brought to 1 bar isothermally against a resisting pressure of 1 bar. The work done (in Joules) by the gas is_________________?
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A. 4988.4

B. 30554

C. 4364.9

D. 10373
44. Joule-Thomson co-efficient is defined as__________________?
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A. ? = (?P/?T)H

B. ? = (?E/?T)H

C. ? = (?T/?P)H

D. ? = (?E/?P)H

45. Fugacity is most helpful in____________________?
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A. The study of chemical equilibria involving gases at atmospheric pressure

B. Representing actual behaviour of real gases

C. Representing actual behaviour of ideal gases

D. None of these

46. Claudes liquefaction process employs the cooling of gases by__________________?
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A. Expansion in an engine

B. None of these

C. Throttling

D. Following a constant pressure cycle

47. Which of the following is an undesirable characteristic of a refrigerant ?
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A. It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils

B. Its vapor pressure at the condenser temperature should be very high

C. None of these

D. It should be non-explosive

48. Which is an example of closed system ?
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A. Boiler

B. Air compressor

C. None of these

D. Liquid cooling system of an automobile
49. Gibbs free energy (F) is defined as__________________?
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A. F = E TS

B. F = H + TS

C. F = H TS

D. F = E + TS

50. The compressibility factor for an ideal gas is 1. Its value for any other real gas is_______________?
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A. 1

B. 1

C. Either B. or C, depends on the nature of the gas
51. Work done in an adiabatic process between two states depends on the__________________?
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A. None of these

B. End states only

C. Rate of heat transmission

D. Initial state only

52. A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is________________?
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A. Positive

B. Negative

C. Zero

D. None of these

53. There is a change in ______________ during the phase transition?
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A. Volume

B. Temperature

C. All a, b & c

D. Pressure

54. Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is_____________________?
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A. Negative

B. Zero

C. Positive

D. Infinity

55. A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is ?i yi P = Yi xifi where, ? is a vapor fugacity component, Yi is the liquid activity coefficient and fi is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of ______________________?
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A. Temperature only

B. Temperature, pressure and liquid composition xi only

C. Temperature, pressure, liquid composition xi and vapour composition yi

D. Temperature and pressure only

56. A solid is transformed into vapour without going to the liquid phase at_________________?
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A. Always

B. Boiling point

C. Below triple point

D. Triple point
57. Joule-Thomson effect i.e., a throttling process is a constant _____________ process?
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A. Entropy

B. Temperature

C. Enthalpy

D. Internal energy

58. A gas mixture of three components is brought in contact with a dispersion of an organic phase in water. The degree of freedom of the system is______________?
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A. 5

B. 4

C. 3

D. 6

59. For equilibrium process (i.e. reversible) in an isolated system __________________?
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A. ds = 0

B. ds = Constant

C. ds 0

60. A gas performs the maximum work, when it expands___________________?
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A. Adiabatically

B. Isothermally

C. Non-uniformly

D. Isobarically