railway RRB JE (CBT I + CBT II) Mock Test 2024 Heat Transfer Conduction Critical Thickness of Insulation
The critical radius of insulation for asbestors with k = 0.125 W/mK surrounding a pipe exposed to room air with h = 2.5 W/m2K is
1
20 mm
2
312.5 mm
3
50 mm
4
5 mm