Chemical Engineering Thermodynamics - Study Mode

[#281] The equation, C p - C v = R, is true for __________ gas.
Correct Answer

(C) Only ideal

Explanation

Solution: $${C_P} - {C_V} = R,$$ xa0 is valid for ideal gas and we can prove this by using $$T-dS$$ xa0equations.

[#282] Duringthe phase transition, __________ changes.
Correct Answer

(B) Volume

Explanation

Solution: During the phase transition the pressure and temperatures remain constant and the volume changes since solids, liquids and gases have different volume.

[#283] The specific heat of saturated water vapour at 100°C is
Correct Answer

(B) -ve

Explanation

Solution: The specific heat is the amount of heat required to change the temperature of the substance from by unit degree. Since during saturated conditions latent heat conversion only takes place and temperature remains constant the situation appears like the system is of infinite strength and there is no change in thermal energy and hence the heat capacity is infinity.

[#284] Melting of ice is an example of an __________ process.
Correct Answer

(B) Isothermal

Explanation

Solution: Since during the phase changes normally the temperature and pressure remains constant we call melting of ice an isothermal process.

[#285] Claude's liquefaction process employs the cooling of gases by
Correct Answer

(A) Expansion in an engine

Explanation

Solution: Claude’s liquefaction process employs cooling of gas by expansion in engine.