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ISRO Scientist ME 2011 Paper

- 2.156 kW
- 2156 kW
- 215.6 kW
- 21.56 kW

Option 1 : 2.156 kW

Free

ST 1: Building Materials

1128

20 Questions
20 Marks
20 Mins

**Concept:**

According to Newton's Law cooling,

Q = h A dT

where, Q = heat transfer, h = Convection heat Transfer coefficient, A = surface area, dT = temperature gradient

**Calculation:**

**GIven:**

T_{∞ }= 20°C, Area of plate = 50 × 75 cm^{2}, T_{s} = 250°C, h = 25 W/m^{2}°C

Q = 25 × 50 × 75 × 10^{-4} × (250 – 20)

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