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(a) Calculate the heat flux through a sheet of steel 10 mm (0.39 in.) thick if the temperatures at the two faces are 300 and 100°C (572 and 212°F); assume steady-state heat flow.
(b) What is the heat loss per hour if the area of the sheet is 0.25 m2 (2.7 ft2)?
(c) What will be the heat loss per hour if soda-lime glass instead of steel is used?
(d) Calculate the heat loss per hour if steel is used and the thickness is increased to 20 mm (0.79 in.).
Derive equations for the capacitance, and resistance across the dielectric of a coaxial line of inner conductor radius a, and outer conductor radius b, and permittivity ε.
A star-bus hybrid topology consists of a main three branch star toplogy with each branch connecting three stations in a bus topology. This toplogy is changed to a new bus-ring hybrid topology with main five station bus topology.
Assume we need to design a cellular system that covers an areaof Radius R=20 miles.For practical reasons (cost of BS , handoffcapability,etc.) ,each cell should cover at least an area of radiusr=1 mile.FDD is used and that each simplex channel re..
The current is due to free electrons moving through the wire at an average velocity of v meters/second. If the concentration of free electrons is 10^29 electrons per cubic meter and if they are uniformly dispersed throughout the wire, then what is..
An industrial plant is to be supplied by three identical transformers. A decision must be made whether to purchased afourth transformer to build a sparing transformer system oralternatively, to configure the source as a secondary selective system.
The load reactance is 4 Ω. Thecommutation overlape and thyrister turn - off time limitthe firing angle in the inverter mode to 1650. Compute(a) peak value of r.m.s. output voltage (b) r.m.s.output current(c) output power.
Let the filter length be 7 or 8. Design four different filters: Type I, Type II, Type III, and Type IV. Derive the equations for the ideal impulse response for these filters. Then multiply the ideal impulse response by the appropriate window funct..
A long hallway has three doors, one at each end and one in themiddle. A switch is located at each door to operate the lights along the hallway. Label the switches X, Y, and Z. Design a logicnetwork to control the lights.
Calculate the impedance to neutral of this line. Calculate the line charging current in A/phase if the line is 100 km long and is operated at line-line voltage of 230 kV (8.565 pF/m, j3.23 micro-Siemens/km, 42.9 A/phase)
You notice low frequency noise (which is near but does not overlap with frequency components from the EKG) due to respiration in your final set-up. Describe how you could generate a filter that would remove this noisy frequency component after data ..
A 75-W, 120-V tungsten incandescent lamp has a resistance of 19.2Ω when no current flows through it. 1.What is the resistance of the lamp when it is connencted to 120-V cource
Germanium is n-type doped at 5x1015 cm-3 at T=300 K. The dimensions of the Hall device are d=5x10-3 cm, W=2x10-2 cm, and L=10-1 cm. The current is Ix=250 A, the applied voltage is Vx=100 mV, and the magnetic flux density is Bz= 500
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