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The measured values of a diode at a temperature of 25 Degrees Celsius are: Vd=1V at Id=50A, Vd=1.5V at Id=600A.
A three-phase line serves a 54MW load with a .9 lagging power factor at a line voltage of 138KV.
Name the 2 curves shown on the graph, and indicate briefly how they are found. Why is it that one is a straight line, but the other exhibits a curve?
Techniques involving the electronic control of power to a load such as controlled rectification and variable frequency drives are widely used by industry.
An electrical load operates at 240 volts rms. The load absorbs an average power of 8 kW at a lagging power factor of 0.8.
Determine the net power developed, the cycle thermal efficiency and the rate of heat transfer to the cooling water passing through the condenser.
A 15 mV sinusoid with input frequency 450 Hz is applied to an FM generator with k = 1000 Hz/20 mV. Find the positive frequency deviation.
Prior to t=0, a 100- uF capacitance is uncharged. Starting at t=0, the voltage across the capacitor is increased linearly with time to 100V in 2s.
Three parallel impedances in rectangular form as follows: 8.66+j5 ohm , 25+j0 ohm , 3.54+j2.54.
A single-phase load is supplied through a 35 kV feeder whose impedance is 115 + j380 Ohms and a 35 kV, 2400 V transformer whose equivalent impedance.
A single phase electric motor has an output power of 10 kW and an efficiency of 90% at full load.
A 3 phase installation powered by 400V 50Hz is composed of 6 machines.The power of the capacitors that should be installed to have a power factor of 0.95.
Design a ?-section symmetrical attenuator pad to provide a voltage attenuation of 12dB with a characteristic impedance of 600O.
The power factor for the factory load can be improved to unity by using a sufficiently large parallel capacitor.
Given the parameter values in the table, and an open-circuit voltage measured as 88.9 kV, calculate the open-circuit power absorbed from the supply.
Assume that two antennas are half-wave dipoles and each has a directive gain of 3dB. If the transmitted power is 1W.
The power level to the line is required to be restricted to -3 dB. The gain of the amplifier is fixed at 24 dB and its maximum input signal.
A splitter is a device that has a single input and several outputs. It is used to send a signal to several different locations.
Find the maximum winding resistance of the secondary winding if the transformer is to have 2% regulation at unity power factor.
A vertical line at a frequency of 150 kHz with a magnitude of 0.60 V and additional vertical lines at 200 kHz and 250 kHz with power levels below that at 150 kH
If the transmitter power can not be changed, what change would have to be made to the receiving earth station to increase CNR by 3 dB?
If they are now connected in parallel across the 150 V supply, find the total current and its power factor when the frequency is 50 Hz.
Xpu in terms of the fault level MVA and the base MVA.The fault level of a system or unit in a system.
A 9 V power supply delivers 2 A to a resistive load. The a.c. supply is 230 V, 50 Hz and a bridge rectifier is used in conjunction with a 0. 047 farad.
The wearout of a machine part has a lognormal distribution with s=0.5 and t_med=5,630 hours. What is MTTF?