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i- A 3-element uniform linear array with inter-element spacing of λ/2 is operated as a broadside array ,find the directions of null radiation , find the direction and the relative level of th
i- the current distribution along the antenna , and the radiated power . ii- if the sorce is now replaced by another with frequency = 300 MHz , find the new current distribution and the radiated pow
A spherical shell is 20 cm thick, with an inner radius of 40 cm. If the charge density is given by 10.4 ×10-3 C/m3 a) Find the total charge Q and Explain why this value of Q is irrational
Two large flat charged plates are fixed parallel to one another in a large tank of distilled water (Er=81) with a total surface charge of 41.25×10-7 C on each plate (with opposite polarities).
Two large flat charged plates are fixed parallel to one another in a large tank of distilled water with a total surface charge of 41.25×10-7 C on each plate (with opposite polarities). The pla
A 1 V battery is connected across a series combination of a 2 k-ohm resistor and a forward-biased diode. Determine iD and vD for the diode using: (i) the ideal diode model; (ii) the constant drop mode
In a DSSS multiple user system, how many simultaneous users may be supported such that an average BER of less than 10E-3 is maintained for each user if the average Eb/No=10dB, and a Pg from a straig
An IS-95 CDMA DSSS with QPSK modulation system and assuming K = 20 users sharing the same 1.25MHz channel, if the maximum Eb/No of 7.8 dB is provided for each user and the PN code lengths are 32,678
A 20 vrms, 60 hz ac source is in series with an ideal diode and a 100 ohm resistance. Determine the peak current and peak inverse voltage (PIV) for the diode
Construction on Hoover Dam was started in 1931 and finished in 1935, and the dam was in service from 1936. When completed, it was both the world's largest electric power producing facility and the w
A current source, Is =16.5cos(2300t) A, a resistor R=134Ω, and an inductor, L=0.12H are all in parallel. Assume steady-state conditions exist. At t=3.9ms, find the power being absorbed by the
A 440 Vrms (line to line voltage) three phase induction motor runs at 1150 rpm driving a load requiring 15Nm of torque. The line current is 3.4 at a power factor of 80% lagging. Find the input power
An electric motor draws 120kW from the line and has losses equal to 20kW, Calculate the output power in HP and efficiency of the motor.
Find the Eb/no ratio in dB for a system operating at 10Mbps in a BW of 1MHz. the un-modulated carrier power is 0.1pW and the system noise temperature is 120 degrees Kelvin.
Derive an expression for the optimum value of the avalanche gain opt M for which the signalto-noise ratio (SNR) becomes optimum by using the following expression for the excess noise factor: Fa( M)=
Compare the noise floor in dBm with the GSM system (BW= 200 kHz) used by the European cell standards (available today in the US thru the AT&T acquired from the Cingular systems) assuming the sam
The channel bandwidth for the analog AMP's system is restricted to BW= 30 kHz. Determine the noise floor (in dBm) for its mobile receivers assuming all receivers have a noise figure of 10 dB.
You chanrge your capacitor above by connecting them to a non-ideal 30-Volt source with a Thevanin resistance of 5 ohm. Since you are careful not to go above the capacitor 25-V rating, design a circu
if 4 cells each rated for 2v, 0.15A connected as batterries in three different ways. find voltage and current rating of each type. (Hint - all in parallel, all in series, two groups of series connec
A 160-ft-diameter parabolic antenna is driven by a 10-W transmitter at 4.3 GHz. Calculate its effective radiated power (ERP) and its beamwidth.
Assume a receiver is located 10 km from a 50 W transmitter. The carrier frequency is 6 GHz and free space propagation is assumed. Assume the unit gains for the system gains. Find: a) The power at th
A 100µF capacitance is connected in parallel with the series combination of 10-mH inductance and a 1 ohm resistance. Calculate the impedance of the combination in polar form for angular freque
Assuming system gains of Gt = 0 dB, Gr = 3 dB, find the power received at the mobile using the two-ray ground reflection model assuming the transmitter antenna height to be 50 m, and the receiving a
Indicate the closest value to the change in decibels of the received signal for the given parameter change. The distance between transmitter and receiver for a one-way communication path is halved.
Design a DC-coupled differential amplifier with differential gain of 50 for input signals near ground, supply voltages of +15V and -15V and quiescent currents of 0.1mA in each transistor.