Chemical Engineering Thermodynamics - Study Mode
[#161] Which of the following is true for Virial equation of state?
Correct Answer
(C) Virial co-efficients are function of temperature only
Explanation
Solution: Virial co-efficients are functions of temperature only.
[#162] A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is Φ i y i P = Y i x i f i ° where, Φ is a vapor fugacity component, Y i is the liquid activity co-efficient and f i ° is the fugacity of the pure component i. the K i value (Y i = K i x i ) is therefore, in general a function of
Correct Answer
(C) Temperature, pressure and liquid composition x i only
[#163] Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the
Correct Answer
(A) Two temperatures only
Explanation
Solution: Efficiency of a Carnot engine is given as $$left( {{T_1} > {T_2}}
ight)aleph = 1 - frac{{{T_2}}}{{{T_1}}}$$ So, it's solely dependent on temperatures of the reservoirs.
[#164] Efficiency of a Carnot engine working between temperatures T 1 and T 2 (T 1 < T 2 ) is
Correct Answer
(A) $$frac{{{{ ext{T}}_2} - {{ ext{T}}_1}}}{{{{ ext{T}}_2}}}$$
Explanation
Solution: Here the question should be read carefully given $$left( {{T_1} < {T_2}}
ight)$$ So, the hot reservoir is $${{T_2}}$$ and cold reservoir is $${{T_1}}$$ hence the efficiency will be $$aleph = 1 - frac{{{T_1}}}{{{T_2}}}$$
[#165] Co-efficient of performance for a reversed Carnot cycle working between temperatures T 1 and T 2 (T 1 > T 2 ) is
Correct Answer
(A) $$frac{{{{ ext{T}}_2}}}{{{{ ext{T}}_1} - {{ ext{T}}_2}}}$$
Explanation
Solution: The reverse of heat engine is nothing but refrigerator coefficient of performance is given as $$COP = frac{{{T_2}}}{{{T_1} - {T_2}}}$$