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A 150-kVA, 7200-600-V, 60Hz, single phase transformer operating at rated conditions has an hysteresis loss of 527 W, an eddy current loss of 373 W, and a conductor loss of 2000W. The transformer is to be used on a 50 Hz system, with the restriction that it maintain the same maximum core flux and the same total losses. Determine (a) the new voltage rating; (b)the new kVA rating.
An inductor rated at 4 Henrys is subjected to a sinusoidal AC voltage of 24 volts RMS, at a frequency of 60 hertza) Write the formula for calculating inductive reactance (XL), and solve for current through the inductor.
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 the side lobe. ii- if the peak radiation is to rotate by 30..
A system has the following input/output relation: y(n) = x(n) + .5 y(n -1). If the input x(n) is the sinusoidal signal shown in problem 1.32(d) (Above), the steady-state output will have the following form: y(n) = A sin(Bn+C). Determine the value ..
For loads causing more than 1 V to appear across the generator, the output current is no longer assured but will be reduced by some unknown amount. This circuit limitation, occurring, for example, at the peak of a sine wave signal
Determine the phase relation between V o and i g for the given network if V g = 45sin(317t) and determine v o for the given network
Design a simple BJT amplifier circuit for receiving the over-the-air HDTV signals. The circuit should have a voltage gain of 10-100, assuming your signal source (antenna) is connected to amp through a cable with an impedance of 75
You are designing a PCS base station that operates at 1800 MHz. The receiver is co-located on a tower with UHF police and business radio systems that operate at 450 MHz. Since the the 4th harmonic from the UHF system is directly in the PCS band
Three point charges are positioned in the x-y plant as follows: 5 nC at y=5 cm, -10 nC at y=-5 cm, and 15 nC at x=-5 cm. Find the required x-y coordinates of a 20 nC fourth charge that will produce a zero electric field at the origin.
Consider an 8-user CDMA system. The data vector of all users is given by [1,1,1,1,-1,-1,-1,1]. Find the total transmit signal.
A network has an input impedance of 120+100j Ohm what is the capacitance that should be placed in parallel with the network to provide an input impadance with: a) Zero Reactance at w=1000 rad/s b) Zero Reactance at w=2000 rad/s
design the logic to control the temperature in a green house. the temperature between 72 degrees and 80 degrees if the tem is below 72 degrees, a heater must be activated if the tem is above 80 degrees a cooler must be started.
two λ/2 dipoles are placed parallel to each other and spaced by a distance d = .15 λ , they are fed with antiphase currents so that I2=-I1=.7 Ampere, i- find the power radiated by the system taking into account the mutual impedance betwen the dipol..
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