Chemical Engineering — Test 194
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Question 1
High pressure steam is expanded adiabatically and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process ?
Question 2
Vapour which is at a pressure smaller than the saturation pressure for the temperature involved is called a _____________ vapour?
Question 3
1st law of thermodynamics is nothing but the law of conservation of___________________?
Question 4
The third law of thermodynamics states that the__________________?
Question 5
In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in_____________?
Question 6
Which of the following identities can be most easily used to verify steam table data for superheated steam ?
Question 7
“At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero”. This follows from the __________________?
Question 8
On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)s and the slope of the reversible isothermal line (∂P/∂V)T are related as (where, y = Cp/Cv) ?
Question 9
Refrigeration cycle_________________?
Question 10
In the reaction, C + O2 → CO2; ΔH = – 94 kcal. What is the heat content (enthalpy) of O2 ?