The numerical designation of air as refrigerant is : 

This question was previously asked in
SSC JE ME Previous Paper 10 (Held on: 11 December 2020 Morning)
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  1. 717
  2. 718
  3. 729
  4. 744

Answer (Detailed Solution Below)

Option 3 : 729
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Detailed Solution

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Explanation:

Nomenclature of refrigerants : 

Refrigeration

Designation

Example

Fully Saturated Hydrocarbon compounds

(freon)

 

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

n + p + q = 2m + 2

Cm HnFp Clq

R - 11 = CFCl3 ;

R - 22 = CHF2Cl

R - 12 = CF2Cl(Freon12)

R- 134 = C2H2F4 Ecofriendly (No clorine)

Unsaturated Hydrocarbon

(freon)

 

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

n + p + q = 2m

Cm HnFp Clq

R-1150 = C2H4

Inorganic Compound

R - (700 + Mol Weight)

R-717 = NH3 , 

R-744 = CO2

R-764 = SO2 , 

R-729 = Air

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