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Determine the net radiant-heat exchange between two parallel oxidized iron plates when the distance between them is 2 ft. and each plate measures 10 by 10 ft. The surface of one is at 200 °F and the other is at `100°F.
A 12-by-12 inches ingot iron casting 60-in high is stripped from its mold while its temperature is 1740 °F. If it stands on end on the floor of a large foundry having wall, floor, and roof temperatures of 80°F, what is the rate of radiant-heat exchange between the casting and the roof wall, and floor surfaces?
Heat radiates from a small sphere suspended in a large room. The surface of the sphere of 1.5 sq. Ft. is at a temperature of 580 °F, and the inside surfaces of the room are at a temperature of 80 °F. Assuming the emissivity of the sphere surface to be 0.30, calculate the radian-heat transfer in BTU/hr.
Two parallel rectangular surfaces 1m x 2m are opposite to each other at a distance of 4 m. The surfaces are black and at 100 °C and 200 °C, respectively. Calculate the heat exchange by radiation between the two surfaces.

The bars AB and AC are joined by a pin at A and a horizontal cable. The vertical cable carrying the 200-kg mass is attached to the pin at A. Determine the tension in the horizontal cable. Neglect the weights of the bars.


The bent beam ABC is attached to a pin at C and rests against a roller support at B. Neglecting the weight of the beam, find the reactions at B and C caused by the 150- kg load. 


The crate weighing 400 lb is supported by three ropes concurrent at B. Find the forces in ropes AB and BC if P=460 lb.


Line LM 58mm long is parallel to HP and inclined to VP at 45. If the point L is 20mm above HP and in VP then draw it's projections, also locate it's trace.


  1. A hydraulic cylinder has bore of 50 mm and moves a mass of 10 kg. It is controlled with a valve with a constant kv = 80 Pa/m. The damping coefficient is 2 Ns/m.

A 50% total solids tomato puree is heated by steam as it flows through a steam injection heater (flash heating) at a rate of 500 kg/h. The steam (100% quality) is generated at 169.06 kPa and is flowing to the heater at a rate of 40 kg/h. The specific heat of the solids in the product is 3.2 kJ/kg K and the initial temperature of the puree is 40oC. Assume the specific heat of the solids in puree is not influenced by the heating process. Given: specific heat of water Cp = 4.18 kJ/kg K a. Draw a flow chart for the process with clear labeling. b. Make all necessary assumptions. c. Determine the temperature of the product leaving the heater. d. Determine the total solids content of the product after heating.


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