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A metal piece of length I has a cross section of a sector of a circle of radius r and included angle of . Its two ends are maintained at temperatures t, and tz (t, > tz). Apply the respective governing equation for this case and find the expression for heat flow through the metal piece, assuming that conductivity of metal varies with temperature according to relation: k = ko (1 – Bt) = ae also assume that at at o and O and outer surfaces of the slab except ar the end surfaces are completely insulated. What will be the rate of heat transfer if I = 600 mm, r= 120 mm, 0 = 60°, tq = 125°C, t2 = 25°C, ko = 115 W/m°C and ß = 104
AnsweredGME asked 1 month ago • 
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4) For a system with the transfer function H(s+2 s2 +4s +3 a) find its frequency response. b) determine its stability. c) if the input is 3 cos(2t)u(t), find the steady-state output. 5) Sketch the Bode plots for the transfer functions 10s (s +10) (s2 + 2s +5) H(s)- with the aid of your calculator.
AnsweredMazurek Gravity asked 2 months ago • 
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The following readings were taken diring the trail
AnsweredGME asked 2 months ago • 
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The following readings were taken during the test of a single-cylinder four stroke oil engine (Figure): Cylinder diameter = 204.82 mm, Stroke length = 416.89 mm, Gross mean effective pressure = 5.04 bar, pumping mean effective pressure = 0.41 bar, engine speed = 373.5 rpm, net load on the brake = 1097.05 N, effective diameter of the brake = 1.4 meters, fuel used per hour = 12.09 kg, calorific value of fuel = 44393.28 kJ/kg, Calculate: (i) Indicated power _________ ; (ii) Brake power ______ ; (iii) Mechanical efficiency ______ ; (iv) Indicated thermal efficiency _________
AnsweredMwate Chito asked 2 months ago • 
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A reactor's wall 320 mm thick, is made up of an inner layer of fire brick (k = 0.84 W/m°C) covered with a layer of insulation (k -0.16 W/m°C). The reactor operates at a temperature of 1325°C and the ambient temperature is 25°C. () Determine the thickness of fire brick and insulation where the interface temperature is 1200°C (ii) Calculate the heat loss
AnsweredGME asked 3 months ago • 
50 views1 answers0 votes
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