GATE ME · 2026 · ME
Question 35: Heat Transfer
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Question 35
MENAT1 markNeeds review
A sphere of radius 5 mm is initially in equilibrium at 400 °C in a furnace. It is suddenly removed from the furnace and dipped in a well-stirred water bath at 20 °C, with a convection heat transfer coefficient of 500 W/(m²K). For the given range of temperatures, the thermophysical properties of the material of the sphere are: density
kg/m³, thermal conductivity
W/(mK), and specific heat
J/(kg K). Neglecting radiation heat transfer, the time required for the centre of the sphere to cool from 400 °C to 50 °C is ______ seconds (rounded off to 2 decimal places).Log in to check the answer
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2026ME
GATE ME 2026 · Paper 1
Mechanical Engineering · Original paper archive
- Section
- Mechanical Engineering
- Question type
- Numerical answer (NAT)
- Marks
- 1 mark
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