chemical engineering thermodynamics for chemical chemical engineering MCQs – Page 23

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 Review each marked answer and report any item that may be outdated or unclear.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
441. Pick out the wrong statement ?
comments icon0

A. Free energy change for a spontaneous process is negative

B. The expansion of a gas in vacuum is an irreversible process

C. Entropy change for a reversible adiabatic process is zero

D. An isometric process is a constant pressure process
442. Pick out the wrong statement?
comments icon0

A. uid and vapour phases at its critical point

B. Surface tension of a substance vanishes at critical point, as there is no distinction between

C. The eccentric factor for all materials is always more than one

D. Change of internal energy is negative for exothermic reactions

E. Entropy of a system decreases with the evolution of heat

443. Entropy change of mixing two liquid substances depends upon the_________________?
comments icon0

A. Molar concentration

B. Quantity (i.e. number of moles)

C. Both A. and B

D. Neither A. nor B

444. _______________ functions are exemplified by heat and work ?
comments icon0

A. None of these

B. State

C. Point

D. Path
445. What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR (where, T1 and T2 are source & surrounding temperatures respectively.) ?
comments icon0
A. TR/(T2 TR) (T1 T2)/T1

B. None of these

C. TR/(T1 TR) (T1 T2)/T1

D. TR/(T2 TR) T1/(T1 T2)

446. is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions ?
comments icon0

A. work needed

B. Work alone cannot bring out such a change of state

C. More information is needed to conclude anything about the path dependence or otherwise of

D. The amount of work needed is independent of path

E. . The amount of work needed is path dependent
447. Grams of butane (C4H10) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be__________________?
comments icon0

A. Data insufficient; cant be computed

B. 580

C. 1160

D. 640

448. Pick out the wrong statement?
comments icon0

A. System (of partially miscible liquid pairs), in which the mutual solubility increases with rise

B. temperature, are said to possess an upper consolute temperature

C. Systems, in which the mutual solubility increases with decrease in temperature, are said to

D. sess lower consolute temperature

E. Nicotine-water system shows both an upper as well as a lower consolute temperature,

F. lying that they are partially miscible between these two limiting temperatures

449. Pick out the wrong statement?
comments icon0

A. perature at which heat is rejected increases

B. A refrigeration cycle violates the second law of thermodynamics

C. In a refrigerator, work required decreases as the temperature of the refrigerator and the

D. One ton of refrigeration is equivalent to the rate of heat absorption equal to 3.53 kW

E. Refrigeration cycle is normally represented by a temperature vs. entropy plot

450. Pick out the wrong statement ?
comments icon0

A. Heat of reaction at constant volume is equal to the change in internal energy

B. Enthalpies of all elements in their standard states are assumed to be zero

C. Clausius-Clapeyron equation is not applicable to melting process

D. Combustion reactions are never endothermic in nature

451. Joule-Thomson co-efficient for a perfect gas is_____________________?
comments icon0

A. Positive

B. None of these

C. Negative

D. Zero
452. The Joule-Thomson co-efficient is defined as (?T/?P)H. Its value at the inversion point is__________________?
comments icon0

A. 1

B. ?

C. #NAME?

D. 0
453. Any substance above its critical temperature exists as _____________________?
comments icon0
A. Gas

B. Liquid

C. Saturated vapour

D. Solid

454. A closed system is cooled reversibly from 100C to 50C. If no work is done on the system________________?
comments icon0

A. its internal energy (U) decreases and its entropy (S) increases

B. U and S both decreases

C. U decreases but S is constant

D. U is constant but S decreases

455. For an ideal gas, the chemical potential is given by______________?
comments icon0

A. R d ln f

B. None of these

C. RT d ln P

D. R d ln P

456. Throttling (Joule-Thomson effect) process is a constant _____________ process?
comments icon0

A. None of these

B. Pressure

C. Entropy

D. Enthalpy
457. If an ideal solution is formed by mixing two pure liquids in any proportion, then the ___________________ of mixing is zero?
comments icon0

A. Enthalpy

B. Volume

C. Both A. & B.

D. Neither A nor B

458. If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be ______________ c.c?
comments icon0
A. 200

B. 50

C. 100

D. 205

459. The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is________________?
comments icon0

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

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

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

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

460. For an ideal solution, the value of activity co-efficient is______________________?
comments icon0
A. 1

B. 0

C. 1