chemical engineering thermodynamics for chemical chemical engineering MCQs – Page 12

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 Review each marked answer and report any item that may be outdated or unclear.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
221. Gibbs-Helmholtz equation is__________________?
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A. ?F = ?H + T [?(?F)/?T]P

B. d(E TS) T, V < 0

C. dP/dT = ?Hvap/T.?Vvap

D. ?F = ?H T?T

222. Specific _____________ does not change during phase change at constant temperature and pressure?
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A. Internal energy

B. Enthalpy

C. Entropy

D. Gibbs energy
223. Which of the following will increase the volume of a real gas by four times ?
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A. Reducing pressure to one fourth at constant temperature

B. Reducing the temperature to half and doubling the pressure

C. Doubling the absolute temperature as well as pressure of the gas

D. Reducing temperature to one fourth at constant pressure

224. In a homogeneous solution, the activity co-efficient of a component depends upon the_________________?
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A. Pressure

B. Composition

C. All (A), B. and (C)

D. Temperature

225. If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the____________________?
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A. Process must be isobaric

B. Temperature must decrease

C. Process must be adiabatic

D. Both B. and C.
226. Solubility of a substance which dissolves with an increase in volume and liberation of heat will be favoured by the_______________?
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A. High pressure and low temperature

B. Low pressure and low temperature

C. Low pressure and high temperature

D. High pressure and high temperature

227. Second law of thermodynamics is concerned with the_________________?
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A. Non-cyclic processes only

B. Amount of energy transferred

C. Direction of energy transfer

D. Irreversible processes only

228. The total change in the enthalpy of a system is independent of the _______________________?
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A. Pressure and temperature

B. None of these

C. State of combination and aggregation in the beginning and at the end of the reaction

D. Number of intermediate chemical reactions involved
229. Throttling process is a/an _____________ process?
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A. Reversible and isothermal

B. Irreversible and constant enthalpy

C. Reversible and constant enthalpy

D. Reversible and constant entropy

230. Ideal refrigeration cycle is____________________?
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A. Dependent on the refrigerants properties

B. The least efficient of all refrigeration processes

C. Same as Carnot cycle

D. Same as reverse Carnot cycle
231. Heat of reaction at constant volume is identified with _____________ change?
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A. Either A. or B

B. Enthalpy

C. Internal energy

D. Neither A. nor B

232. The specific heat of saturated water vapour at 100C is__________________?
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A. #NAME?

B. -ve

C. an data-mce-type="bookmark" style="width: 0px;overflow: hidden;line-height: 0" class="mce_SELRES_start">?</span>A. ?

D. 0

233. In the equation PVn = constant, if the value of n = y = Cp/Cv, then it represents a reversible ______________ process?
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A. Isothermal

B. Isentropic

C. Adiabatic

D. Polytropic

234. Free energy___________________?
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A. Decreases in all spontaneous (or irreversible) processes

B. All A, B. and C

C. Remains unchanged in reversible processes carried at constant temperature and pressure

D. Change during a spontaneous process has a negative value

235. _______________ increases with increase in pressure?
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A. The melting point of wax

B. The boiling point of a liquid

C. Both A. and B

D. Neither A. nor B

236. Answer: Option B 392. Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27C, the temperature should be raised to _____________ C?
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A. 300

B. 270

C. 327

D. 540

237. If we increase the pressure on a substance (which is at its triple point), then the triple point __________________?
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A. May increase or decrease; depends on the substance

B. Remains unchanged

C. Decreases

D. Increases

238. Internal energy of an element at 1 atm and 25 C is ____________ kcal/kg.mole?
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A. 0

B. 273

C. 25

D. None of these

239. Gibbs free energy of a pure fluid approaches _____________ as the pressure tends to zero at constant temperature?
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A. Minus infinity

B. None of these

C. Infinity

D. Zero

240. In the decomposition of PCl5 represented by, PCl5 ? PCl3 + Cl2, decrease in the pressure of the system will _____________ the degree of dissociation of PCl5?
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A. Increase

B. Decrease

C. Not alter

D. None of these