4571. In Joule-Thomson porous plug experiment, the
A. Enthalpy does not remain constant
B. Entire apparatus is exposed to surroundings
C. Temperature remains constant
D. None of these
✅ The correct answer is option D.
Chemical Engineering
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4572. (∂H/∂T)p is the mathematical expression for
A. CV
B. Entropy change
C. Gibbs free energy
D. None of these
✅ The correct answer is option D.
4573. For the gaseous phase chemical reaction, C₂H₄(g) + H₂O(g) ⟷ C₂H₅OH(g), the equilibrium conversion does not depend on the
A. Steam to ethylene ratio
B. Temperature
C. Pressure
D. None of these
✅ The correct answer is option D.
4574. All gases during throttling process at atmospheric temperature and pressure show a cooling effect except
A. CO₂
B. H₂
C. O₂
D. N₂
✅ The correct answer is option B.
4575. Which of the following is not a reversible process ?
A. Expansion of an ideal gas against constant pressure
B. Atmospheric pressure vaporisation of water at 100°C
C. Solution of NaCl in water at 50°C
D. None of these
✅ The correct answer is option C.
4576. A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg⁻¹. K⁻¹. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg⁻¹ , K⁻¹ is
A. -1.87
B. 0
C. 1.26
D. 3.91
✅ The correct answer is option B.
4577. Heat is added at constant temperature in an ideal __________ cycle.
A. Stirling
B. Brayton
C. Rankine
D. None of these
✅ The correct answer is option A.
4578. As the temperature is lowered towards the absolute zero, the value of ∂(ΔF)/∂T, then approaches
A. Unity
B. Zero
C. That of the heat of reaction
D. Infinity
✅ The correct answer is option B.
4579. A gas mixture of three components is brought in contact with a dispersion of an organic phase in water. The degree of freedom of the system are
A. 4
B. 3
C. 5
D. 6
✅ The correct answer is option B.
4580. For equilibrium process (i.e. reversible) in an isolated system
A. ds = 0
B. ds < 0
C. ds > 0
D. ds = Constant
✅ The correct answer is option A.