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Determine Ql using f = fs. Can the approximate approach be applied? Determine fp and fm.
If the resonant frequency is 20,000 Hz, find the value of L and C at resonance.
Find the resonant frequencies fs, fp, and fm. What do the results suggest about the Qp of the network?
It is desired that the impedance ZT of the high-Q circuit of Fig. be 50 kO p.
Find the energy stored or returned by the capacitor and the inductor over one half-cycle of the power curve for each.
An electrical system is rated 5 kVA, 120 V, at a 0.8 lagging power factor.
Find the type of elements and their impedance in ohms within each electrical box.
Find the total number of watts, volt-amperes reactive, and volt-amperes, and Fp.
The lighting and motor loads of a small factory establish a 10-kVA power demand at a 0.7 lagging power factor on a 208-V, 60-Hz supply.
Find the current drawn from the supply at unity power factor, and compare it to the uncompensated level.
Determine the change in supply current from the uncompensated to the compensated system.
If a solid iron core is inserted in the coil, the current is found to be 2 A, and the wattmeter reads 60 W.
If a brass core is inserted in the coil, the effective resistance increases to 7O , and the wattmeter reads 30 W.
A wattmeter is connected with its current coil as shown in Fig. and with the potential coil across points f-g. What does the wattmeter read?
The voltage source of Fig. delivers 660 VA at 120 V, with a supply current that lags the voltage by a power factor of 0.6.
Obtain a plot of reactive power for a pure capacitor of 636.62 µF at a frequency of 1 kHz for one cycle of the input voltage.
Plot both the applied voltage and the source current on the same set of axes for the network of Figure.
Write a program that will demonstrate the effect of increasing reactive power on the power factor of a system.
Given the resistance or reactance of each element and the source voltage at zero degrees, calculate the real, reactive, and apparent power of the system.
Using the results of part a, determine the maximum power delivered.
Determine the level of capacitance that will ensure maximum power to the load if the range of capacitance is limited to 1 nF to 5 nF.
For the network of Fig. (a), find the current I. Repeat part (a) for the network of Fig. (b).
Determine the current through the 4-kO capacitive reactance of Figure.
Given the reactance of the same network elements, determine I for voltage sources of any magnitude but the same angle.
Write a program to determine the Thevenin voltage and impedance for any level of reactance for each element and any magnitude of voltage.