chemical engineering thermodynamics for chemical chemical engineering Mcqs
501. For a constant pressure reversible process, the enthalpy change (?H) of the system is___________________?
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A. Cv.dT

B. ? Cp.dT

C. Cp.dT

D. ? Cv.dT

502. The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is_________________?
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A. Cv log10 4

B. R loge 4

C. Cv loge 4

D. R log10 4

503. ________________ decreases during adiabatic throttling of a perfect gas?
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A. Entropy

B. Temperature

C. Enthalpy

D. Pressure
504. Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which___________________?
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A. Mutual solubility of the two liquids shows a decreasing trend

B. None of these

C. A homogeneous solution (say of phenol water) is formed

D. Two liquids are completely separated into two layers

505. The internal energy of an ideal gas does not change in a reversible _____________ process?
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A. Isometric

B. Isothermal

C. Isobaric

D. Adiabatic

506. All gases above its inversion temperature, in a throttling process will show__________________?
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A. No change in temperature

B. A heating effect

C. A cooling effect

D. Either A. or (C)

507. The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called the ____________ temperature?
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A. Critical

B. Reduced

C. Boyle

D. Inversion

508. The difference between isothermal compressibility and adiabatic compressibility for an ideal gas is____________________?
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A. +ve

B. ?

C. #NAME?

D. 0

509. Mollier diagram is a plot of___________________?
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A. Entropy vs. enthalpy

B. Temperature vs. enthalpy

C. Temperature vs. internal energy

D. Temperature vs. enthalpy

510. Chemical potential is a/an_____________________?
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A. Extensive property

B. Intensive property

C. Force which drives the chemical system to equilibrium

D. Both B. and C
511. Heat requirement for decomposition of a compound into its elements is _____________ that is evolved during the formation of that compound from its elements?
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A. Less than

B. The same

C. Different than

D. Greater than

512. At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be________________?
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A. Less

B. Same

C. More

D. More or less; depending on the system

513. 4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is_________________?
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A. 8 J

B. 4 J

C. ?

D. 0
514. Domestic refrigerator usually works on the _____________ refrigeration cycle?
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A. Absorption

B. Air

C. Carnot

D. vapour-ejection

515. Pick out the wrong statement ?
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A. The chemical potential of species i in the mixture (?i) is mathematically represented as,?i =

B. dency of that component

C. The chemical potential of ith species (?i) in an ideal gas mixture approaches zero as the

D. ssure or mole fraction (xi) tends to be zero at constant temperature</strong>

E. (nG)/?ni]T,P,nj where, n, ni and nj respectively denote the total number of moles, moles of ith

F. The chemical potential of a pure substance depends upon the temperature and pressure

516. The unit of equilibrium constant of a chemical reaction is the same as that of__________________?
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A. Temperature

B. None of these

C. Molar concentration

D. Internal energy

517. Equation which relates pressure, volume and temperature of a gas is called the__________________?
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A. Equation of state

B. Gibbs Duhem equation

C. None of these

D. Ideal gas equation

518. A liquid under pressure greater than its vapour pressure for the temperature involved is called a _____________ liquid?
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A. Sub-cooled

B. Saturated

C. None of these

D. Non-solidifiable

519. The equation Tds = dE PdV applies to___________________?
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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
520. The value of gas constant R is__________________?
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A. 1.987 cal/gm mole K

B. 1.987 BTU/lb. mole R

C. Both A. and B

D. Neither A. nor B

521. Isentropic process means a constant _____________________ process ?
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A. Entropy

B. Enthalpy

C. Pressure

D. None of these

522. Entropy is a/an___________________?
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A. Macroscopic property

B. Extensive property

C. None of these

D. State function

523. Pick out the correct statement?
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A. A real gas on expansion in vacuum gets heated up

B. An ideal gas on expansion in vacuum gets cooled

C. A real gas on expansion in vacuum cools down whereas ideal gas remains unaffected

D. An ideal gas on expansion in vacuum gets heated up

524. Which is not constant for an ideal gas ?
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A. All (A), B. & (C)

B. (?P/?V)T

C. (?P/?V)V

D. (?V/?T)P

525. Translational kinetic energy of molecules of an ideal gas is proportional to (where, T = absolute temperature of the gas)__________________?
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A. 1/?T

B. T2

C. ?T

D. T
526. Co-efficient of Performance (COP) of a refrigerator is the ratio of the ______________________?
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A. Lower to higher temperature

B. Refrigeration obtained to the work required

C. Higher to lower temperature

D. Work required to refrigeration obtained

527. (?H/?T)P is the mathematical expression for____________________?
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A. None of these

B. CV

C. Entropy change

D. Gibbs free energy