chemical engineering thermodynamics for chemical chemical engineering MCQs – Page 22

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 Review each marked answer and report any item that may be outdated or unclear.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
421. Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will_________________?
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A. First fall and then rise

B. Decrease

C. Remain unchanged

D. Increase
422. Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are_______________?
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A. Always greater than one

B. Same at the same reduced temperature

C. Same at the same reduced pressure

D. Both B. & C
423. In polytropic process (PVn = constant), if n = 1; it means a/an ______________ process?
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A. None of these

B. Adiabatic

C. Reversible

D. Isothermal
424. The expression, nCv(T2 T1), is for the _____________ of an ideal gas?
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A. Compressibility

B. Work done under adiabatic condition

C. Co-efficient of thermal expansion

D. None of these

425. COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about____________________?
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A. 4.5

B. 3.5

C. 8.5

D. 0.5

426. In a turbine, the fluid expands almost_________________?
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A. None of these

B. Isobarically

C. Isothermally

D. Adiabatically
427. A gas shows deviation from ideal behaviour at______________?
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A. Low pressure and high temperature

B. Low temperature and high pressure

C. High temperature and high pressure

D. Low pressure and low temperature

428. Change of state namely evaporation condensation, freezing and melting is an _______________ process?
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A. Isochoric

B. Isothermal

C. Adiabatic

D. Isobaric

429. Which of the following decreases with increase in pressure ?
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A. Boiling point of liquids

B. Melting point of ice

C. Melting point of wax

D. None of these

430. In the ammonia synthesis reaction, N2 + 3H2 ? 2NH3 + 22.4 kcal, the formation of NH3 will be favoured by___________________?
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A. High temperature

B. Low pressure

C. Low temperature only

D. Both low temperature and high pressure
431. Pick out the wrong statement?
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A. The values of (?P/?V)T and (?2P/?V2)T are zero for a real gas at its critical point

B. During a reversible adiabatic process, the entropy of a substance remains constant

C. Heat transferred is equal to the change in the enthalpy of the system, for a constant pressure,

D. #NAME?

E. Thermal efficiency of a Carnot engine depends upon the properties of the working fluid

F. ides the source & sink temperatures</strong>

432. During the phase transition, _______________ changes?
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A. Pressure

B. Volume

C. All A , B. and C

D. Temperature

433. The number of degrees of freedom at the triple point of water is__________________?
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A. 2

B. 1

C. 0

D. 3

434. What is the number of degree of freedom for a system of two miscible non-reacting species in vapor-liquid equilibrium forming an azeotrope ?
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A. 3

B. 1

C. 2

D. 0

435. (1/V) (?V/?T)P is the mathematical expression__________________?
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A. co-efficient of thermal expansion

B. Joule-Thomson co-efficient

C. Specific heat at constant pressure (Cp)

D. Specific heat at constant volume (CV)

436. Pick out the wrong statement ?
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A. In case of an ideal gas, the fugacity is equal to its pressure.

B. ponent.

C. The fugacity co-efficient is zero for an ideal gas

D. In a mixture of ideal gases, the fugacity of a component is equal to the partial pressure of the

E. Activity co-efficient is dimensionless.

437. The four properties of a system viz. P, V, T, S are related by ______________ equation?
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A. None of these

B. Gibbs-Helmholtz

C. Gibbs-Duhem

D. Maxwells
438. Pick out the correct statement ?
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A. hanged

B. In a closed system, the energy can be exchanged with the surrounding, while matter cannot be

C. All the natural processes are reversible in nature

D. Work is a state function

E. Entropy and enthalpy are path functions

439. Gibbs-Duhem equation_____________________?
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A. Finds no application in gas-liquid equilibria involved in distillation

B. perature and pressure</strong>

C. None of these

D. Applies only to binary systems

E. States that n1d?1 + n2d?2 + .njd?j = 0, for a system of definite composition at constant
440. In an isothermal process on an ideal gas, the pressure increases by 0.5 percent. The volume decreases by about _____________ percent?
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A. 0.75

B. 0.25

C. 1

D. 0.5