A. Indeterminate
B. Zero
C. Negative
D. None of these
Related Mcqs:
- 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?
A. Isobaric
B. Isothermal
C. Adiabatic
D. None of these - The chemical potential of a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and pressure. It is given by_________________?
A. (∂E/∂ni)S, v, nj
B. (∂G/∂ni)T, P, nj = (∂A/∂ni) T, v, nj
C. (∂H/∂ni)S, P, nj
D. All (A), B. and (C) - In case of steady flow compression polytropic process (PVn = constant), the work done on air is the lowest, when_______________?
A. n = y = 1.4
B. n = 0
C. n = 1
D. n = 1.66 - Free energy change at equilibrium is____________________?
A. Zero
B. Positive
C. Negative
D. Indeterminate - At constant temperature and pressure, for one mole of a pure substance, the ratio of the free energy to the chemical potential is____________________?
A. Zero
B. One
C. Infinity
D. Negative - Gibbs free energy (G) is represented by, G = H – TS, whereas Helmholtz free energy, A. is given by, A = E – TS. Which of the following is the Gibbs-Helmholtz equation ?
A. [∂(G/T)/∂T] = – (H/T2)
B. [∂(A/T)/∂T]V = – E/T2
C. Both A. and B.
D. Neither A. nor B. - The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by_________________?
A. Biological oxygen pond
B. Aerated lagoons
C. Trickling filters
D. Gravity separator having oil skimming devices - The ratio of existing moles of vapor per mole of vapor free gas to the moles of vapor that would be present per mole of vapor free gas, if the mixture were saturated at the existing temperature & pressure, is termed as the_____________________?
A. Relative humidity
B. Relative saturation
C. Percentage saturation
D. None of these - The work done in an adiabatic change in a particular gas depends upon changes in the ______________ only?
A. Temperature
B. Specific heat
C. Volume
D. Pressure - A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system________________?
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
