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A spherical ball of diameter 20 mm is initially maintained at a uniform temperature of 400 °C. It is first subjected to heat (h = 10 * W/(m ^ 2 - K)) treatment first by passing ambient air at 20 °C until the temperature at its center line is lowered down to 335 °C. The spherical ball is next dipped in a liquid pool at 20 °C with a very high heat transfer coefficient (h = 6000 * W/(m ^ 2 - K)) due to boiling until the center of the sphere cools down to 50 °C. What is the overall time required to complete this heat treatment plus quenching process
Assume the following material properties: rho = 3000 kg / (m ^ 3) , C =
1000 J / kg-K' rho = 3000 kg / (m ^ 3) , a = 6.66 x 10-6 m²/ sec
A thermocouple is used to measure the temperature of air flowing through a duct. The heat transfer coefficient between the air and the thermocouple is proportional to v0.8, where v is the average velocity of the air within the duct. Assume that the heat transfer by radiation from the duct walls to the thermocouple bead is linearly proportional to the temperature difference between them. For v = 5 m/s, the thermocouple reads 50 °C while when the air flows at 10 m/s, it reads 40 "C. (a) If the actual temperature of the air is 25 °C, estimate the wall
temperature. (b) What temperature will the thermocouple indicate when the gas velocity is 20 m/s.
A spherical ball of diameter 20 mm is initially maintained at a uniform temperature of 400 °C. It is first subjected to heat (h = 10 * W/(m ^ 2 - K)) treatment first by passing ambient air at 20 °C until the temperature at its center line is lowered down to 335 °C. The spherical ball is next dipped in a liquid pool at 20 °C with a very high heat transfer coefficient (h = 6000 * W/(m ^ 2 - K)) due to boiling until the center of the sphere cools down to 50 °C. What is the overall time required to complete this heat treatment plus quenching process.
Assume the following material properties: rho = 3000 kg / (m ^ 3) , C =
1000 J kg-K' rho = 3000 kg / (m ^ 3) , a = 6.66 x 10-6 m² / sec
The tension in cable BC is 725 Newton. Determine the resultant of the three forces exerted at point B of beam AB.
steam turbine developed 2372.20 Hp when its inlet condition is 1300 Btu/lb enthalpy and 400 ft/s velocity and steam flow of 200 Btu/min :The exit enthalpy is 800 Btu/min. Find the exit velocity.
What are the techniques available for fabrication of 3D structures on the micrometer scale? Explain
What is micromachining? Explain the steps involved
QUESTION 8 Given B 2 31 2 21 1 32 find the eigenvalues of B and an eigenvector for B corresponding to 1. (10) [10] QUESTION 9 A function f(x) is defined by: 2 fx x x , Determine the Fourier expansion of the periodic function f(x) with period 2 . (12) [12]
