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A box is divided into two parts of equal volume via a partition. The box is thermally insulated from the surroundings. Consider that compartment 1 contains an ideal gas A at P0, T0 and compartment 2 is evacuated.
(a) Calculate the pressure and temperature in both compartments at equilibrium if the partition is removed.
(b) Calculate the entropy change due to the removal of the partition.
A 415V 3-phase a.c. motor has a power output of 12.75kW and operates at a power factor of 0.77 lagging and with an ef?ciency of 85%. If the motor is delta-connected, verify
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