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Mechanical Engineering
A steam radiator with enveloping radiating surface 60-in long by 26-in high by 12-in deep is supported above the floor of a large room. If the radiator surface, painted with lacquer containing 10 percent aluminum, is at a temperature of 200 °F and the room surfaces are at 70 °F, what is the rate of radiant-heat exchange between the radiator and the surfaces of the room?
Mechanical Engineering
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.
Mechanical Engineering
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?
Mechanical Engineering
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.
Mechanical Engineering
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.
Mechanical Engineering
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.
Mechanical Engineering
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.
Mechanical Engineering
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.
Electrical Engineering
Implement the following logic function using a Multiplexer having three select lines.
F(P,Q,R,S) = PQ̅R + QRS̅ + PQR̅
Electrical Engineering
Implement:
i) Full-Adder
ii)Full-Subtractor
in a Active High output Decoder Circuit and 2-input NAND Gates.
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#339914 on Dec 2023
#339914 on Dec 2023