Sulphur dioxide refrigerant can be designated as:

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SSC JE Mechanical 07 Jun 2024 Shift 2 Official Paper - 1
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  1. R - 727
  2. R - 764 
  3. R - 744 
  4. R - 729

Answer (Detailed Solution Below)

Option 2 : R - 764 
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Detailed Solution

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Concept:

 

Saturated Hydrocarbons

Un-saturated Hydrocarbons

Representation:

R - (m - 1) (n + 1) P

R - 1(m - 1) (n + 1) P

Chemical formula:

CmHnFpClq 

CmHnFpClq

Relation:

n + p + q = 2m + 2

n + p + q = 2m


where m = No. of Carbon atoms, n = No. of Hydrogen atoms, p = No. of Florine atoms, q = No. of Chlorine atoms

If refrigerant is an Inorganic Compound

R – (Molecular Weight + 700)

The refrigerant designation for Sulphur Dioxide is R-764:

  • The '7' indicates that the refrigerant contains a single sulphur atom.
  • The '64' is derived from the molecular weight of sulphur dioxide.

Additional Information

Common refrigerants and their designations include:

  • R-717: Ammonia (NH3).
  • R-744: Carbon Dioxide (CO2).
  • R-134a: 1,1,1,2-Tetrafluoroethane (C2H2F4).
  • R-22: Chlorodifluoromethane (CHClF2).

 

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