A. Increase
B. Decrease
C. No change
D. None of these
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 - The melting point of paraffin wax (which contracts on solidification) _______________ with pressure rise?
A. Increases
B. Decreases
C. Remains unchanged
D. Decreases linearly - The expression for entropy change, ΔS = n Cp . ln (T2/T1), is valid for the ______________ of a substance?
A. Simultaneous pressure & temperature change
B. Heating
C. Cooling
D. Both B. and C - ______________ has the highest melting point out of the following ?
A. Tungsten
B. Zirconium
C. Molybdenum
D. Tantalum - Boiling of liquid is accompanied with increase in the__________________?
A. Vapor pressure
B. Specific Gibbs free energy
C. Specific entropy
D. All (A), B. and (C) - Entropy change for an irreversible process taking system and surrounding together is___________________?
A. 0
B. > 0
C. < 0
D. None of these - The absolute entropy for all crystalline substances at absolute zero temperature is ____________________?
A. Zero
B. Negative
C. More than zero
D. Indeterminate - The expression for entropy change given by, ΔS = – nR ln (P2/P1), holds good for___________________?
A. Expansion of a real gas
B. Reversible isothermal volume change
C. Heating of an ideal gas
D. Cooling of a real gas - Entropy change in case of reversible adiabatic process is________________?
A. Minimum
B. Zero
C. Maximum
D. Indeterminate - The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is_________________?
A. R loge 4
B. R log10 4
C. Cv log10 4
D. Cv loge 4
