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Maximum charge on the globe. Calculate the maximum amount of charge that can be placed on the globe without causing breakdown in air. Assume a radius of 6400 km and breakdown occurs at 3 x 106 V/m.
A motor and position controller has an output position x(t) and an input voltage v(t). The transfer function for the system is X/V = [64(s+4)]/[s^2 +4s+8] (a) Determine x(t) for a unit step input voltage such that v(t) = 1u(t).
The circuit is also required to recognize overlapping sequence such that if the input string is x = 1101111111010 then the output will be z = 0000001111000. Use D Flip-Flops AND a separate design with JK Flip-Flops.
An industrial isolation transformer has a power rating of 1.0 kVA at 240 VAC. Identify the nominal turns ratio (nsec/ npri). Calculate the rated current of the secondary winding.
Describe how three-position control might be used to cause a windmill to always face into the wind. The windmill is rotated with a bidirectional DC motor.
A 12-kW, 120-V dc series generator has a series field resistance of 0.05 Ω. The generaated emf is 135V when the generator delivers the rated load at its rated terminal voltage. What is the armature resistance
A pn-junction is formed in silicon by doping one side with acceptor atoms at concentration Na = 10^19 cm^(-3) and another side with donor atoms at Nd = 10^18 cm^(-3). What is the dopant concentration on the p-type side and on the n-type side
Calculate the extraction efficiency (in percentage) of flat - surface LED without any encapsulation (emits directly into the air). The LED is fabricated from material with the refractive index n = 2.3.
A pn-junction is uniformly doped and has dopant concentration of NA = 4 x10^16 cm^-3 in the pregion at 300K. At zero bias, 20% of the total space charge region (W) is extended in the pregion. Calculate Vbi, ND, W, xn and xp.
You have a parallel plate capacitor of area A, gap d and two dielectric materials of constants κ1 and κ2. You only have enough of each material to fill 1/2 of the capacitor volume. Which arrangement maximizes the capacitance? Why?
The difference equation from part (b) should have the form of an oscillator, i.e., h[n] should be periodic for n ≥ 0. What is the period of h[n]? Based on this, write an expression for the frequency of this oscillator as a function of m.
A VSWR is measured along a transmission line to be 2. Find two values for the reflection coefficient ? Which of these values will correspond to ZL Zc
The characteristic impedance is 50 . Use CAD to plot the insertion loss versus frequency.
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