chemical engineering MCQs – Page 420

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
8381. Which of the following is a thermodynamic property of a system ?
comments icon0

A. Temperature

B. Entropy

C. Concentration

D. Mass

8382. Domestic refrigerator usually works on the _____________ refrigeration cycle?
comments icon0

A. Air

B. vapour-ejection

C. Absorption

D. Carnot

8383. Partial molar free energy of an element A in solution is same as its__________________?
comments icon0
A. Chemical potential

B. Activity co-efficient

C. Fugacity

D. Activity

8384. Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution) ?
comments icon0

A. 1/log H+

B. log (1/H+)

C. None of these

D. log (1/H+)

8385. Which of the following has the minimum value of COP for a given refrigeration effect ?
comments icon0

A. Vapour-compression process with a reversible expansion engine

B. Air refrigeration cycle

C. Reverse Carnot cycle

D. Ordinary vapour-compression cycle

8386. (?E/?T)V is the mathematical expression for____________________?
comments icon0
A. None of these

B. CV

C. Enthalpy change

D. Free energy change

8387. In a turbine, the fluid expands almost_________________?
comments icon0

A. Isothermally

B. None of these

C. Isobarically

D. Adiabatically
8388. 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?
comments icon0

A. 540

B. 270

C. 327

D. 300

8389. Specific heat of a gas for a reversible adiabatic process is________________?
comments icon0

A. None of these

B. Infinity

C. Negative

D. Zero
8390. Joule-Thomson Co-efficient at any point on the inversion curve is___________________?
comments icon0

A. #NAME?

B. #NAME?

C. 0

D. ?

8391. Specific/molar Gibbs free energy for a pure substance does not change during________________?
comments icon0

A. Melting

B. Vaporisation

C. Either A, B. or C.

D. Sublimation

8392. The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is__________________?
comments icon0

A. Equal

B. Less pronounced

C. Data insufficient, cant be predicted

D. More pronounced
8393. The unity of Plancks constant h in the equation, E = hv is____________________?
comments icon0

A. J/s

B. J/kmol

C. J.S

D. kmol/J

8394. Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will_________________?
comments icon0

A. Decrease

B. Remain unchanged

C. Increase

D. First fall and then rise

8395. In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is__________________?
comments icon0

A. Unchanged by the pressure change

B. Independent of the temperature

C. Decreased with the increase in pressure

D. Increased with the increase in pressure

8396. Pick out the correct statement?
comments icon0

A. A process is irreversible as long as ? S for the system is greater than zero

B. mation of the compound from its reactants</strong>

C. If an insoluble gas is passed through a volatile liquid placed in a perfectly insulated container,

D. The mechanical work done by a system is always equal to?P.dV

E. temperature of the liquid will increase

F. The heat of formation of a compound is defined as the heat of reaction leading to the
8397. Number of components (C), phase (P) and degrees of freedom (F) are related by Gibbs phase rule as________________?
comments icon0

A. P = F C 2

B. F = C P 2

C. C = P F + 2

D. P + F C = 2
8398. 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__________________?
comments icon0

A. 7058.3

B. 6738.9

C. 6753.5

D. 9000

8399. Gases are cooled in Joule-Thomson expansion, when it is _____________ inversion temperature?
comments icon0

A. Either B. or C.

B. Below

C. Above

D. At

8400. dW and dq are not the exact differential, because q and W are__________________?
comments icon0

A. State functions

B. Path functions

C. Intensive properties

D. Extensive properties