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A medium wave antenna mast is 50 m high and is operating at 1 MHz with a top loading the effective height is equal to 45 meters :
i- find the radiation resistance .ii- with input power = 100 Kw , find the input current given that the ground resistance = 2.5 ohm .iii- find the radiated E field at 30 Km from the antenna .
With a 500hp shunt wound DC motor, at 1800rpm, 500Vdc, FLA is 800Adc, Ra is 0.025 and Rf is 400. What would Va need to be if you wanted the motor to operate at 1000rpm at rated torque. Keeping the field current constant.
An injection-molding machine can be purchased and installed for $90,000. It is in the seven-year GDS property class and is expected to be kept in service for eight years. It is believed that $10,000 can be obtained when the machine is disposed of ..
Determine the range of DC current that can be applied to coil 2 without saturating the core when coil 1 has a steady 10A DC current in the direction that makes the flux flow CW on the ring . The Current at coil 2 has the same direction as the curr..
A current of 4 A flows through a wire forming a "loop" circle of radius r. If the magnetic field in the center of the "loop" is 10 A, what is the radius along the "loop": a) if the loop consists of a loop of wire, b) if the "loop" consists of 20 t..
Calculate the signal to noise ratio given RMS Noise Voltage = 20mV and RMS Signal Voltage = 2.5V Calculate ETotalRMS given e21RMS = 5V and e22RMS = 7V
An ac circuit with 4.157kv 60hz with a load of 2880 kva load and pf=.8 lagging find all the currents (6 total), also draw the diagram.
the -3 dB frequency for low pass Butterworth filter is 2.5 kHz. The stop band begins at 3.8 kHz, with an attention of 35 dB. Determine the minimum order of the filter if the sampling rate is 8 kHz
Describe the charge diffusion and drift in a PN junction, without and then with an applied voltage
The available circuit components are NMOS transistor, PMOS transistor, resistors, capacitors and inductors. Ideal sources can only be used to generate the supply voltage VDD & GND.
Calculate the parameters RE and XE, and the maximum efficiency and power output for the transformer when a load with a 90% lagging power factor is connected to the transformer secondary winding.
If the balloon has a diameter of 12 m and carries two people, 85 Kg each, determine the acceleration of the balloon when it is first released. Assume the density of air is p= 1.16 kg/m^3, and neglect the weight of the ropes and the cage.
The wave function of a certain standing wave on a string fixed at both ends is y(x,t) = 0.30 sin(0.0025x)cos(300t) where y and x are in centimetres and t is in seconds. If the string is vibrating in its fifth harmonic, how long is it
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