A capacitive impedance has a power factor a) Unitary b) In delay c) In advance d) None of the above
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A capacitive impedance has a power factor
a) Unitary
b) In delay
c) In advance
d) None of the above
Step by step
Solved in 3 steps
- The power factor for an inductive circuit (R-L load), in which the current lags the voltage, is said to be (a) Lagging (b) Leading (c) ZeroConvert the following instantaneous currents to phasors, using cos(t) as the reference. Give your answers in both rectangular and polar form. (a) i(t)=5002cos(t30) (b) i(t)=4sin(t+30) (c) i(t)=5cos(t15)+42sin(t+30)Let a 100V sinusoidal source be connected to a series combination of a 3 resistor, an 8 inductor, and a 4 capacitor. (a) Draw the circuit diagram. (b) Compute the series impedance. (C) Determine the current I delivered by the source. Is the current lagging or leading the source voltage? What is the power factor of this circuit?
- The instantaneous power absorbed by the load in a single-phase ac circuit, for a general R LC load under sinusoidal-steady-state excitation. is (a) Nonzero constant (b) Zero (c) Containing double-frequency componentsA source supplies power to the following three loads connected in parallel: (1) a lighting load drawing 10kW. (2) an induction motor drawing 10kVA at 0.90 power factor lagging, and (3) a synchronous motor operating at 10hp,85 effIciency and 0.95 power factor leading (1hp=0.746kW). Determine the real, reactive, and apparent power delivered by the source. Also, draw the source power triangle.An 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.
- (a) Transform v(t)=75cos(377t15) to phasor form. Comment on whether =377 appears in your answer. (b) Transform V=5010 to instantaneous form. Assume that =377. (c) Add the two sinusoidal functions a(t) and b(t) of the same frequency given as follows: a(t)=A2cos(t+) and b(t)=B2cos(t+). Use phasor methods and obtain the resultant c(t). Does the resultant have the same frequency?The admittance of the impedance j12 is given by (a) j2S (b) j2S2 (c) j4SA single-phase source has a terminal voltage V=1200volts and a currentI=1530, which leaves the positive terminal of the source. Determine the real and reactive power and state whether the source is delivering or absorbing each.
- Consider a single-phase load with an applied voltage v(t)=150cos(t+10)volts and load current i(t)=5cos(t+50)A. (a) Determine the power triangle. (b) Find the power factor and specify whether it is lagging or leading. (c) Calculate the reactive power supplied by capacitors in parallel with the load that correct the power factor to 0.9 lagging.Circuit elements with an inductance of 200 mH, a capacity of 50 μF and a resistance of 10 Ω connected in parallel. if we apply average value of 198 V sinusoidal AC voltage to the system . Find the line current, impedance and phase angle of the circuit. (Take Frequency in 60 Hz)A certain industrial load has an impedance of 0.6 angle 30 ohms at a frequency of 60 Hz. What capacitorconnected in parallel with this load causes the angle of the total impedance to decrease to 15º ? Also if the load voltage is 120 V, what is the decrease in line current produced by adding the capacitor ?