Chemical Engineering - Chemical Engineering Thermodynamics

46.
The melting point of paraffin wax (which contracts on solidification) __________ with pressure rise.
increases
decreases
remains unchanged
decreases linearly
Answer: Option
Explanation:
No answer description is available. Let's discuss.

47.
Co-efficient of Performance (COP) of a refrigerator is the ratio of the
work required to refrigeration obtained.
refrigeration obtained to the work required.
lower to higher temperature.
higher to lower temperature.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

48.
The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is
Answer: Option
Explanation:
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49.
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
-1.87
0
1.26
3.91
Answer: Option
Explanation:
No answer description is available. Let's discuss.

50.
dW and dq are not the exact differential, because q and W are
state functions
path functions
intensive properties
extensive properties
Answer: Option
Explanation:
No answer description is available. Let's discuss.