Chemical Engineering Thermodynamics - Study Mode

[#131] Ideal gas law is applicable at
Correct Answer

(D) High T, low P

Explanation

Solution: A gas is close to ideal gas behavior at low pressure and high temperatures since at these conditions the gas satisfies the required conditions to be an ideal gas like the attractive forces between the molecules of gas becomes zero etc.

[#132] Ideal refrigeration cycle is
Correct Answer

(B) Same as reverse Carnot cycle

Explanation

Solution: Since ideal refrigeration cycle is just the reverse of ideal heat engine cycle (Carnot cycle), the ideal refrigeration cycle is same as reverse Carnot cycle.

[#133] Specific volume of an ideal gas is
Correct Answer

(B) The reciprocal of its density

Explanation

Solution: The specific volume of any gas is inverse of density. For an ideal gas, $$PV=nRT$$ $$ Rightarrow P = frac{{RT}}{{Mv}}$$ xa0xa0 where $$v=$$ specific volume.

[#134] The necessary and sufficient condition for equilibrium between two phases is
Correct Answer

(D) The chemical potential of each component should be same in the two phases

Explanation

Solution: The necessary and sufficient condition for a system containing different phases and different constituents to be in internal equilibrium is pressure and temperature of each and every phase should be same and chemical potential of constituent in a phase should be same in all the other phases.

[#135] $$frac{1}{{ ext{V}}}{left( {frac{{partial { ext{V}}}}{{partial { ext{T}}}}}
ight)_{ ext{P}}}$$ xa0 is the mathematical expression
Correct Answer

(C) Co-efficient of thermal expansion

Explanation

Solution: The fractional change in volume with change in temperature is called as coefficient of thermal expansion of a material with respect to volume.