chemical engineering thermodynamics for chemical chemical engineering MCQs – Page 15

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 Review each marked answer and report any item that may be outdated or unclear.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
281. For an ideal gas, the internal energy depends upon its ____________ only?
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A. Temperature

B. Molecular size

C. Pressure

D. Volume

282. Which of the following is not affected by temperature changes ?
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A. None of these

B. Activity co-efficient

C. Fugacity

D. Free energy

283. Filling of gas from a high pressure cylinder into small bottles is an example of a/an ______________ process?
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A. Adiabatic

B. Steady

C. Unsteady

D. Equilibrium

284. If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them. This is ______________ law?
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A. Hesss

B. Lavoisier and Laplace

C. Kirchoffs

D. None of these

285. The number of degrees of freedom for an azeotropic mixture in a two component vapourliquid equilibria is/are__________________?
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A. One

B. Zero

C. Three

D. Two

286. The temperature at the eutectic point of the system is the _____________ temperature that can be attained in the system?
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A. None of these

B. Highest

C. Lowest

D. Average

287. In case of steady flow compression polytropic process (PVn = constant), the work done on air is the lowest, when_______________?
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A. n = 1.66

B. n = 0

C. n = 1

D. n = y = 1.4

288. The equation, PV = nRT, is best obeyed by gases at____________________?
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A. None of these

B. Low pressure & high temperature

C. High pressure & low temperature

D. Low pressure & low temperature

289. The point at which all the three (solid, liquid and gas) phases co-exist, is known as the ____________ point?
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A. Freezing

B. Boiling

C. Boyle

D. Triple
290. On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (?P/?V)s and the slope of the reversible isothermal line (?P/?V)T are related as (where, y = Cp/Cv) ?
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A. (?P/?V)S = 1/y(?P/?V)T

B. (?P/?V)S = (?P/?V)T

C. (?P/?V)S = [(?P/?V)T]Y

D. (?P/?V)S = y(?P/?V)T
291. The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is__________________?
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A. Data insufficient, cant be predicted

B. More pronounced

C. Less pronounced

D. Equal

292. Entropy of an ideal gas depends upon its__________________?
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A. Pressure

B. Temperature

C. Both A. & B

D. Neither A. nor B

293. When a system is in equilibrium for all possible processes, the differential or finite change of entropy is__________________?
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A. < 0

B. 0

C. None of these

D. > 0

294. ______________ Equation predicts the activity co-efficient from experimental data ?
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A. Lewis-Randall

B. Margules

C. Van Laar

D. Both B. & C.
295. The following heat engine produces power of 100,000 kW. The heat engine operates between 800 K and 300 K. It has a thermal efficiency equal to 50% of that of the Carnot engine for the same temperature. The rate at which heat is absorbed from the hot reservoir is____________________?
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A. 320,000 kW

B. 200,000 kW

C. 160,000 kW

D. 100,000 kW

296. In jet refrigerators, the refrigerating fluid is practically always_________________?
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A. Water

B. Freon

C. Ammonia

D. Brine

297. Thermal efficiency of a Carnot engine can approach 100%, only when the temperature of the__________________?
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A. Cold reservoir approaches zero

B. Hot reservoir approaches infinity

C. Either A. or B

D. Neither A. nor B

298. The free energy change for a chemical reaction is given by (where, K = equilibrium constant)________________?
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A. -RT ln K

B. T ln K

C. RT ln K

D. -R ln K

299. Entropy change of the reaction, H2O (liquid) ? H2O (gas), is termed as the enthalpy of___________________?
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A. Formation

B. Sublimation

C. Vaporisation

D. Solution

300. If the heat of solution of an ideal gas in a liquid is negative, then its solubility at a given partial pressure varies with the temperature as__________________?
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A. Solubility increases or decreases with temperature depending on the Gibbs free energy change

B. Solubility increases as temperature increases

C. Solubility is independent of temperature

D. Solubility increases as temperature decreases

E. solution