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The cutoff frequencies of a series resonant circuit are 5400 Hz and 6000 Hz.
A resonant frequency of 8400 Hz Find the value of L and C and the cutoff frequencies.
Design a series resonant circuit to have a bandwidth of 400 Hz using a coil with a Ql of 20 and a resistance of 2 O.
A series resonant circuit is to resonate at ?s = 2p × 106 rad/s and draw 20 W from a 120-V source at resonance.
The additional resistance required to establish the indicated fractional bandwidth.
Determine the resonant frequency. Find the voltage VC at resonance.
Calculate XL and XC using fp. How do they compare? Find the total impedance at resonance (fp).
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.