Correct Answer - Option 2 : 1.75 kW
Concept:
\(COP = \frac{{Referigeration\;Capacity}}{{Work\;input}}\)
1 Ton of Refrigerant = 210 kJ/min = 3.5 kW
Calculation:
Given, Refrigeration capacity = 3 tons = 3 × 3.5 kW = 10.5 kW, COP = 6
\(6 = \frac{{10.5\;kW}}{{{W_{In}}}}\)
Win = 1.75 kW