Pressure of water vapour is given by
A. $$\frac{{0.622{{\text{P}}_{\text{v}}}}}{{{{\text{P}}_{\text{b}}} - {{\text{P}}_{\text{v}}}}}$$
B. $$\frac{\mu }{{1 - \left( {1 - \mu } \right)\frac{{{{\text{P}}_{\text{s}}}}}{{{{\text{P}}_{\text{b}}}}}}}$$
C. $$\frac{{{{\text{P}}_{\text{v}}}\left( {{{\text{P}}_{\text{b}}} - {{\text{P}}_{\text{d}}}} \right)}}{{{{\text{P}}_{\text{d}}}\left( {{{\text{P}}_{\text{b}}} - {{\text{P}}_{\text{v}}}} \right)}}$$
D. None of these
Answer: Option D
Solution(By Examveda Team)
Pressure of water vapour is given by, $$ln\left( {\frac{{{{\text{P}}_1}}}{{{{\text{P}}_2}}}} \right) = \left( {\frac{{\Delta {\text{Hvap}}}}{{\text{R}}}} \right)\left( {\frac{1}{{{{\text{T}}_2}}} - \frac{1}{{{{\text{T}}_1}}}} \right)$$This Question Belongs to Mechanical Engineering >> Refrigeration And Air Conditioning
Nusselt number (NN) is given by
A. $${{\text{N}}_{\text{N}}} = \frac{{{\text{h}}l}}{{\text{k}}}$$
B. $${{\text{N}}_{\text{N}}} = \frac{{\mu {{\text{c}}_{\text{p}}}}}{{\text{k}}}$$
C. $${{\text{N}}_{\text{N}}} = \frac{{\rho {\text{V}}l}}{\mu }$$
D. $${{\text{N}}_{\text{N}}} = \frac{{{{\text{V}}^2}}}{{{\text{t}}{{\text{c}}_{\text{p}}}}}$$
In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = Bypass factor)
A. B.P.F. - 1
B. 1 - B.P.F.
C. $$\frac{1}{{{\text{B}}{\text{.P}}{\text{.F}}{\text{.}}}}$$
D. 1 + B.P.F.
The undesirable property of a refrigerant is
A. Non-toxic
B. Non-flammable
C. Non-explosive
D. High boiling point
The desirable property of a refrigerant is
A. Low boiling point
B. High critical temperature
C. High latent heat of vaporisation
D. All of these
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