Gate ME-2005 Question Paper With Solutions

Q 57. A small copper ball of 5 mm diameter at 500 K is dropped into an oil bath whose temperature is 300 K. The thermal conductivity of copper is 400 W/m.K ,its density 9000 kg/ and its specific heat 385 J/kg.K. If the heat transfer coefficient is 250 W/.K and lumped analysis is assumed to be valid, the rate of fall of the temperature of the ball at the beginning of cooling will be,in K/s,

(A) 8.7

(B) 13.9

(C) 17.3

(D) 27.7

Answer: (C)

Explanation:

Gate ME-2005 Question Paper With Solutions

Gate ME-2005 Question Paper With Solutions

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