In a refrigerating machine, heat rejected is _________ heat absorbed.
A. Equal to
B. Less than
C. Greater than
D. None of these
Answer: Option B
Solution(By Examveda Team)
In a refrigerating machine, the heat rejected is less than the heat absorbed. This is due to the basic principle of refrigeration cycles, where heat is absorbed from the refrigerated space (or substance) at a low temperature and rejected to a higher temperature environment.During the refrigeration cycle, the refrigerant absorbs heat from the evaporator, causing it to evaporate and thus cooling the refrigerated space. This absorbed heat is typically less than the heat rejected by the refrigerant in the condenser, as the heat rejected includes both the heat absorbed from the refrigerated space and the additional heat input required to overcome irreversibilities and losses in the system.
Therefore, the heat rejected is less than the heat absorbed in a refrigerating machine, making Option B: Less than the correct choice.
This Question Belongs to Mechanical Engineering >> Refrigeration And Air Conditioning
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Comments ( 3 )
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
Sir here option B is incorrect.
Always condenser heat rejected more then the evaporator heat is absorbed .
Factors affecting relative humidity ?
Sir, But in actual heat absorbed is more than heat rejection.