Engineering, 13.07.2019 05:30 bks53
In a heat treatment process, a 30 mm diameter stainless steel (aisi 304) ball (ρ= 7900 kg/m3 , cp = 477 j/kg·k, k = 14.9 w/m·k) is removed from the oven at a uniform temperature of 500ºc. the ball is then subjected to a flow of air at 27ºc which provides a convection coefficient of 500 w/m2 ·k. determine: a. how long does it take for the ball to reach a minimum temperature (t) of 300ºc and the rate of heat removal (q) by each ball during this process.
Answers: 1
Engineering, 04.07.2019 18:10
Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.
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Engineering, 04.07.2019 18:10
Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.
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Engineering, 04.07.2019 18:10
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Engineering, 04.07.2019 18:20
What is the heat treatment of metals? what is the benefit of it? why and how it's useful? answer in details, do not write by hand.
Answers: 3
In a heat treatment process, a 30 mm diameter stainless steel (aisi 304) ball (ρ= 7900 kg/m3 , cp =...
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