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Application: Tunnels as waveguides. The following communication system is proposed for communication in mine tunnels to avoid the need for cables: The tunnel is used as a waveguide 5 m wide and 2 m high.
(a) What is the lowest frequency that may be used.
(b) If it is desired to propagate a single mode, what is the maximum bandwidth that may be used and still guarantee propagation in the lowest mode?
Sketch a preliminary layout for the following heat exchanger systems. On the layout sketch indicate pipe work manifolds, access platforms, access for construction, operations and maintenance.
a 230 v shunt motor having an armature resistance of 0.05 ohms and a field resistance of 75 ohms draws a line current
The final pressure is 5 kpa . If specific internal energy of the gas decreases by 40 kj/kg, find the heat transfer in magnitude and direction.
a mass of gas at an initial pressure of 28 bar and with an internal energy of 1500 kj is contained in a well-insulated
a pipeline connects 2 reservoirs. the elevation of the upper reservoir is 20 m higher than the elevation of the lower
Double-pipe heat exchanger. This type of heat exchanger is composed of concentric pipes, with hot water flowing in the inner pipe while cold water flows in the annulus between the inner pipe wall and outer pipe wall.
consider the cuau crystal structure. it can be described as a simple cubic lattice with a basis of cu 0 0 0 cu 1 2 1 2
two large water reservoirs are connected by 8000 ft of schedule 40 steel pipe. the level of one reservoir is 500 ft
1 the critical crack length for a through crack in a thick plate of 7150-t651 aluminum alloy that is in uniaxial
a apply the newton-raphson method to the function fx tanhx2-9 to evaluate its known real root at x3. use an initial
The rod ABC is made of steel (E = 29 X 10^6 psi). Determine the normal stress in section BC. Determine the deflection at point B and C.
a 1-m3 rigid tank initially contains air at 150 kpa 300 k. the tank is connected through a valve to a supply line at
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