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A quartz window of thickness L serves as a viewing port in a furnace used for annealing steel. The inner surface (x = 0) of the window is irradiated with a uniform heat flux q;: due to emission from hot gases in the furnace. A fraction, ß, of this radiation may be assumed to be absorbed at the inner surface, while the remaining radiation is partially absorbed as it passes through the quartz. The volumetric heat generation due to this absorption may be described by an expression of the form q(x) = (1 - ß) q"oae-ax where ex is the absorption coefficient of the quartz. Convection heat transfer occurs from the outer surface (x = L) of the window to ambient air at T8 and is characterized by the convection coefficient h. Convection and radiation emission from the inner surface may be neglected, along with radiation emission from the outer surface. Determine the temperature distribution in the quartz, expressing your result in terms of the foregoing parameters.
A three phase bridge rectifier has a purely resistive load of R= 100 ohm and is supplied from a 280 V, 60 Hz supply. The primary and the secondary of the input transformer are connected in Y. Determine the average output voltage of the rectifier
A particular load has a pf of 0.8 lagging. The power delivered to the load is 40 kW from a 220-V rms 60-Hz line. What value of capacitance placed in parallel with the load will raise the pf to 0.9 lagging
A single phase 220V system draws a current of 15A at a lagging power factor of 0.8. Calculate the value of a capacitor that can be used to improve the power factor of this system to 0.95 lagging.
Compute the material dispersion of a wavelength 10nm lower than zero dispersion wavelength assumed to be 1300 nm.
In US, electric wires are classified based on their gauge numbers. The larger the gauge number is, the smaller the diameter of the cross-section of the wire becomes. You are given four different types of wire with gauge numbers 1, 3, 7, and 8.
A voltage source V(t)=100cos(6Π109t - 45(degrees))(V) is connected to a series RLC circuit. If R = 10MΩ, C = 100pF, and L = 1H, use phasor notation to find the following: a.) i(t) b.) Vc(t) (voltage across capacitor)
A shunt regulator utilizing a zener diode is biased on through a 100 resistor. Determine the change in the regulated output voltage for the two situations below: a) VI changes +2.0 V, ILoad constant b) ILoad changes +100 mA, VI constan..
a) Derive the expression for the transconductance characteristic, gm-vgs, of a JFET. b) Using the expression of the transfer characteristic and the transconductance characteristic, derive formula that expresses the relationship between gm & ip.
Three single-phase transformer are used to form a three-phase transformer bank rated 13.8kV(delta)/120kV(wye). One side is connected to a three-phase load of 12 MVA at 0.8 power factor lagging. Determine the turns ratio of each transformer
A control system is needed to control a small shopping center parking lot lighting system and the exterior lighting for the building. The design specifications require that the parking lot lighting and the exterior lighting turn on at dusk automat..
Given a coaxial cable with solid inner conductor of radius a, an outer conductor that goes from radius b to c (so c>b>a), a charge +Q that is assumed evenly distributed throughout a meter length of the inner conductor
The dielectric strength of air is 3.0 10^6 V/m, and that of neoprene rubber is 1.2 10^7 V/m. A certain air-gap, parallel plate capacitor can store no more than 0.070 J of electrical energy before breaking down. How much energy can this capacitor s..
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