Chemical Engineering Thermodynamics

232. In an ideal solution, the activity of a component equals its

1. Mole fraction
2. Fugacity at the same temperature and pressure
3. Partial pressure
4. None of these

View answer

233. In an irreversible process

1. Tds = dE - dW = 0
2. dE - dW - Tds = 0
3. Tds - dE + dW < 0
4. Tds - dT + dW < 0

View answer

234. In an isothermal process on an ideal gas, the pressure increases by 0.5 percent. The volume decreases by about _________ percent.

1. 0.25
2. 0.5
3. 0.75
4. 1

View answer

235. In any spontaneous process,

1. Only F decreases
2. Only A decreases
3. Both F and A decreases
4. Both F and A increase

View answer

236. In any spontaneous process, the _________ free energy decreases.

1. Helmholtz
2. Gibbs
3. Both ‘a’ & ‘b’
4. Neither 'a' nor 'b'

View answer

237. In case of a close thermodynamic system, there is _________ across the boundaries.

1. No heat and mass transfer
2. No mass transfer but heat transfer
3. Mass and energy transfer
4. None of these

View answer

238. In case of a reversible process (following pvⁿ = constant), work obtained for trebling the volume (v1 = 1 m³ and v23 m³) is maximum, when the value of 'n' is

1. 0
2. 1
3. y = 1.44
4. 1.66

View answer

239. In case of an _________ process, the temperature of the system increases.

1. Isothermal compression
2. Isothermal expansion
3. Adiabatic expansion
4. Adiabatic compression

View answer

240. In case of steady flow compression polytropic process (PVn = constant), the work done on air is the lowest, when

1. n = y = 1.4
2. n = 0
3. n = 1
4. n = 1.66

View answer