chemical engineering thermodynamics for chemical chemical engineering MCQs – Page 19

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 Review each marked answer and report any item that may be outdated or unclear.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

361. Pick out the correct equation relating F and A___________________?
0

A. F = A + PV

B. F = E + A

C. F = A TS

D. F = A + TS

362. Critical compressibility factor for all substances___________________?
0

A. Vary as square of the absolute temperature

B. None of these

C. Vary as square of the absolute pressure

D. Are more or less constant (vary from 0.2 to 0.3)

363. The change in Gibbs free energy for vaporisation of a pure substance is___________________?
0

A. May be positive or negative

B. Zero

C. Positive

D. Negative

364. Entropy change for an irreversible isolated system is__________________?
0

A. < 0

B. 0

C. > 0

D. ?

365. With increase in compression ratio, the efficiency of the otto engine________________?
0

A. Increases linearly

B. Decreases

C. Increases

D. Remain constant

366. A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect ?
0

A. Carnot refrigeration cycle

B. Vapor compression cycle using expansion valve

C. Air refrigeration cycle

D. Vapor compression cycle using expansion engine

367. Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of _____________________?
0

A. Sublimation

B. Transition

C. Fusion

D. Vaporisation

368. The freezing point of a liquid decreases when the pressure is increased, if the liquid ____________ while freezing?
0

A. Does not change in volume

B. Either (A), B. or (C)

C. Expands

D. Contracts

369. On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will____________________?
0

A. Increase in summer and will decrease in winter

B. Increase

C. Decrease

D. Remain same

370. The necessary condition for phase equilibrium in a multiphase system of N components is that the____________________?
0

A. Chemical potentials of a given component should be equal in all phases

B. Chemical potentials of all components should be same in a particular phase

C. Sum of the chemical potentials of any given component in all the phases should be the same

D. None of these

371. The chemical potential of any constituent of an ideal solution depends on the ______________ of the solution?
0

A. Composition

B. Temperature

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

D. Pressure

372. At 60 C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60 C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is__________________?
0

A. 4.238

B. 1.572

C. 1.9398

D. 3.389

373. Adiabatic compression of a saturated water vapour makes it ____________________ ?
0

A. Supersaturated

B. Superheated

C. Both A. and B

D. Neither A. nor B

374. Refrigeration cycle_________________?
0

A. Violates second law of thermodynamics

B. Involves transfer of heat from low temperature to high temperature

C. Both A. and B

D. Neither A. nor B

375. For water at 300C, it has a vapour pressure 8592.7 kPa and fugacity 6738.9 kPa Under these conditions, one mole of water in liquid phase has a volume of 25.28 cm3 and that in vapour phase in 391.1 cm3.Fugacity of water (in kPa) at 9000 kPa will be__________________?
0

A. 6753.5

B. 7058.3

C. 9000

D. 6738.9

376. The principle applied in liquefaction of gases is_____________________?
0

A. Adiabatic expansion

B. Joule-Thomson effect

C. Both A. and B

D. Neither A. nor B

377. Which of the following is a widely used refrigerant in vapour compression refrigeration system (using large centrifugal compressor) ?
0

A. Ammonia

B. Freon

C. Methyl chloride

D. Liquid sulphur dioxide

378. 1st law of thermodynamics is nothing but the law of conservation of___________________?
0

A. None of these

B. Energy

C. Momentum

D. Mass

379. The expression, ?G = nRT. ln(P2/P1), gives the free energy change______________?
0

A. During heating of an ideal gas

B. During cooling of an ideal gas

C. Under reversible isothermal volume change

D. With pressure changes at constant temperature

380. The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible _____________ process?
0

A. Adiabatic

B. Isothermal

C. None of these

D. Isobaric

Previous Next

Showing 361 to 380 of 527 mcqs