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Show all work. If you need to assume anything, state your assumptions clearly. Reasonable assumptions that are necessary to solve the problem will be accepted.
In all problems assume properties of free space (ε0 = 8.854x10-12 F/m, μ0 = 4Π x10-7 H/m, η0 =377 Ω, phase velocity in air: 3 x108 m/s
1. Two dipole antennas are given, both λ/2 in length, one operating at a frequency f1, the second operating at a frequency f2 >> f1. Both are made of copper, have a radius b and a conductivity a. Calculate the ratio of their efficiencies. Copper has permeability and permittivity of free space.
When a 0.900kg mass oscillates on an ideal spring, the frequency is 1.49Hz . A)What will the frequency be if 0.300kg are added to the original mass. Try to solve this problem without finding the force constant of the spring.
A permanent magnet commutator motor produces a torque of8 N. m with armature current = 10A. armature R=.16 ohms. if motordrives a load requiring torque of 20 N. m at speed = 1800rpm
With 0 being the time of arrival of the three persons at the post office, give the probability distribution of the time of the last departure
A single-phase 240/120 V transformer has the following parameters: R1 = 1 ohm, R2 = 0.5 ohms, X1 = 6 ohms, X2 = 2 ohms, Ro = 500 ohms & Xo = 1.5k ohms. (a) Load voltage referred to the primary side (b) Currents of the primary and secondary windings
Determine the current in a circuit consisting of a 1000-ohm resistor with a voltage of 50 volts DC across it. When using an ammeter, why do you place it in parallel with the circuit
design op amp circuit to produce output vout which is related to inputs v1, v2 and v3 by expression vout= -(3v1+5v2+8v3). assume max permitted resistor value= 200k.
What is the typical output pressure of an oil-fired furnace oil pump?
Assuming that this process passes through an ideal lowpass filter with a bandwidth of 50 kHz and the output is denoted by Y(t), determine SY(f), the power spectral density of Y(t), and the total power in the output process.
A three phase, 25-hp, 440-V, 60-Hz, 1750 rpm, wound-rotor induction motor has the following equivalent circuit parameters:R1=0.20 ohms, X1=1.0 ohms, R2=0.15 ohms, X2=0.8 ohms, Xm=30 ohms The motor is connected to a three phase, 440-V, 60-Hz supply.
With respect to sinusoidal signals, explain the difference between the way we normally define "amplitude" and the "amplitude" measurement on an oscilloscope. Also, How does the amplitude setting on a function generator relate to these
A radar antenna transmits 50 kW at 10 GHz. Assume transmission is in a narrow beam, 1 m2 in area, and that within the beam, waves are plane waves. The wave is re?ected from an aircraft but only 1 % of the power propagates in the direction of the a..
What is a delay loop and how is it developed?
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