A 7.5kW load with a lagging power factor of 0.83 is connected to a 240V (rms) power line at 60Hz. Determine the value of the capacitance necessary to increase the fp to 0.95. PLEASE CHOOSE AN OPTION: A) C = 128,64 \mu F, B) C = 118,64 \mu F, C ) 108, 64 \mu F
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- The rms value of v(t)=Vmaxcos(t+) is given by a. Vmax b. Vmax/2 c. 2Vmax d. 2VmaxAn industrial load consisting of a bank of induction motors consumes 50 kW at a power factor of 0.8 lagging from a 220-V,60-Hz, single-phase source. By placing a bank of capacitors in parallel with the load, the resultant power factor is to be raised to 0.95 lagging. Find the net capacitance of the capacitor bank in F that is required.Shown in the figure below is an "RC" circuit drive by an AC power source. The AC power source has an RMS voltage of Vps (RMS) = 11.58 Volts and is running at a frequency of f = 1.326e+04 Hz. resistor has a resistance of R = 3750 2 and the capacitor has an capacitance of C = 3.17e-09 Farads. Vps R ww Write the FORMULA for the total impedance of the circuit Ztot = Write the FORMULA for the phase of the total impedance of the circuit tot = Determine the numerical value of Ztot = Determine the numerical value of Pztot= Determine the current through the circuit: • I(PEAK) = • I(RMS) = Determine the voltage across the resistor: Amps Amps S2 C degrees
- 2.14 The current waveforms of la capocitov are avesage peak cursend *atings of 1, =500 A of shown in Fiquse Determine square (rms), and capacitor. Assume, The root mean half sine -wave t = loo us -300 AS t3 Soo Ns f, -250HZ T2 2001)The value of the capacitance reactive power in VAR is? /2) The value of the capacitor in micro farad is?Shown in the figure below is an "RL" circuit drive by an AC power source. The AC power source has an RMS voltage of Vps (RMS) = 9.84 Volts and is running at a frequency of f = 8.585e+04 Hz. The resistor has a resistance of R = 2170 and the inductor has an inductance of L = 3.54e-03 Henries. Vps R ww Write the FORMULA for the total impedance of the circuit Ztot = Determine the numerical value of Ztot = 2890.5 Determine the numerical value of $z= = 41 Determine the current through the circuit: • I(PEAK) = 4.81E-3 • I(RMS) = 3.404E-3 Determine the voltage across the resistor: • VR(PEAK) = 7.387 • VR(RMS) = 5.22 ✔✔ Amps ✔Amps Write the FORMULA for the phase of the total impedance of the circuit z... = | tan-1 2701 R x Volts X Volts Determine the voltage across the inductor: • VL(PEAK) = 9.184 • VL(RMS) = 6.49 ✔ Volts Volts L R²+ WL- ✔ degrees 2 If a second circuit were connected in parallel with the inductor, this circuit would be considered as: O a low-pass filter O a capacitive switcher…
- . Determine the capacitance value that, when placed in parallel with this load, would produce a unity power factor. Assume that the source is 230 V at 60 Hz. The Q shown is a positive Inductive reactive power, which would have to be “offset” by the same value of Reactive Capacitance Power.Lance Smile operated two loads in parallel. The loads draw a total of 3kW at a 90% power factor lagging operating at a 230 Vrms 60-hz voltage source. Load 1 is taking 1000 W at 80% power factor lagging. Determine the following: a. The power factor of the second load. b. If a capacitor is connected in parallel with the loads, what is the value of the capacitance needed to correct the power factor to 95% lagging for the combined load.If, in one (360 degrees), all of the instantaneous power falls under positive loops (no negativeloops), the load must be:a. A resistorb. An inductor or capacitorExplain: