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A certain antenna installation using a transmitting frequency of 1250 kHz uses an insulated vertical tower of height 200 feet. For a 25 kW transmitter power, calculate the electric field strength at a location A at a distance of 25 km.Calculate also the field strength at a location B that is 5 km vertically above location A.
The transformer is supplying a load of 325 MVA, with 0.93 power factor lagging at a voltage of 24 kV (line-to-line) on its low-voltage side. It is supplied from a feeder whose impedance is 0.11 + j2.2 ohms connected
Two random variables have zero mean and variance of 16 and 36. Their correlation coefficient is 0.5. A). find the variance of the sum. B). find the variance of their difference C). Repeat (a) and (b) if the correlation coefficient is -0.5
calculate the short-circuit current of a three-phase delta-wye connected transformer if the short circuit occurs between phase A and the neutral at the low voltage side, and the transformer is supplied by a 13 kV line-to-line voltage.
A series connected DC motor has R_F + R_A = 11.5 ohm and draws 1 A of current from a DC voltage source with V_T = 18 V while running at 1000 rpm. What is the speed and developed torque when drawing 0.75 A of current
Suppose you are designing a power amplifier for a loudspeaker which has an equivalent resistance of 150 . What should be the Thevenin equivalent resistance of the power amplifier in order to maximize the power transfer to the loudspeaker
A differential equation of a system with x(t) as an input and y(t) as an output is defined as a.)Find the system response to unit step function, x(t)= u(t), where b.) Specify the Zero Input Response.
You do some quick measurements and find that the area of the lagoon behind the dam would be about 5m wide by 20m long, and the lagoon would be about 3m deep at high tide, and 1m deep at low tide.
An analog system has a bandwidth of 10 MHz, a photodetector of = 0.5 A/W and ID = 1 nA, and a signal to noise ratio (SNR) of 30 dB. The receiver's temperature is 270 C and the load resistance is 50 .
Consider the full wave rectifier circuit as shown below, where R=1k-ohm, C= 100 F. If the input voltage Vin = 24 V(peak to peak), Frequency=1k Hz, transformer turns ratio is 1.
Discuss the factors that determine transformer efficiency. What are some sources of transformer losses and how can these can be reduced
1. Determine the peak-to-peak current ripple in the output inductor for a forward converter and determine the output voltage ripple of the converter. We know the following parameters: duty cycle d, input voltage Vin, turn ratio.
A signal contains a mixture 30 , 100 and 240 Hz Sine waves and also contains wideband noise whose spectrum is from 500 Hz up to a 1000 Hz. Describe a filtering technique that can be used to cleanly separate 30, 100 and 240 Hz from each other and a..
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