A. ds = 0
B. ds <0
C. ds > 0
D. ds = Constant
Related Mcqs:
- Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg. K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is_______________?
A. Superheated vapour
B. Partially condensed vapour with quality of 0.9
C. Saturated vapour
D. Partially condensed vapour with quality of 0.1 - A change in state involving a decrease in entropy can be spontaneous, only if ____________________?
A. It is exothermic
B. It is isenthalpic
C. It takes place isothermally
D. It takes place at constant volume - Entropy change for an irreversible isolated system is__________________?
A. ∞
B. 0
C. < 0
D. > 0 - A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively) ?
A. Δ S1 is always Δ SR
C. Δ S1 is always > Δ SR
D. Δ S1 is always = Δ SR - For a spontaneous process, free energy__________________?
A. Is zero
B. Increases
C. Decreases whereas the entropy increases
D. And entropy both decrease - In any spontaneous process, ?
A. Only F decreases
B. Only A decreases
C. Both F and A decreases
D. Both F and A increase - In any spontaneous process, the ______________ free energy decreases ?
A. Helmholtz
B. Gibbs
C. Both A. & B.
D. Neither A. nor B. - _____________ law of thermodynamics ascertains the direction of a particular spontaneous process?
A. Zeroth
B. First
C. Second
D. Third - For equilibrium process (i.e. reversible) in an isolated system __________________?
A. ds = 0
B. ds 0
D. ds = Constant - An isolated system can exchange ______________ with its surroundings?
A. Matter
B. Energy
C. Neither matter nor energy
D. Both matter and energy
