What is the phase sequence of the following sets of voltages? Va = 4200 cos ( wt - 25° ) V Vb = 4200 cos ( wt - 145° ) V Vc = 4200 cos ( wt + 100° ) V a) abc b) acb c) cba
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- 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 componentsThe circuit shows an unbalanced electrical installation powered by a positive sequence symmetrical three-phase network of 380 V compound voltage. The loads are single phase. Load 1 absorbs an active power of 950 W with f.d.p. 0.5 inductive. Load 2 absorbs an active power of 1,140 W with f.d.p. Unit. Load 3 absorbs from the network an active power of 760 W with f.d.p. 0.5 capacitive. Taking the network voltage URN as the phase reference, calculate: a) complex expressions of the line currents IR. Is. and ITThe circuit shows an unbalanced electrical installation powered by a positive sequence symmetrical three- phase network of 380 V compound voltage. The loads are single phase. Load 1 absorbs an active power of 950 W with f.d.p. 0.5 inductive. Load 2 absorbs an active power of 1,140 W with f.d.p. Unit. Load 3 absorbs from the network an active power of 760 W with f.d.p. 0.5 capacitive. Taking the network voltage URN as the phase reference, calculate: a) complex expressions of the line currents IR. Is. and IT RO- SO TO IR Is IT U₁-380 V CARGA 1 P₁ =950 W cos p1=0,5 ind. CARGA 2 P₂=1.140 W cos p₂=1 CARGA 3 P3=760 W cos p3=0,5 cap.
- c) Calculate the phase voltages of the following zero, positive, and negative sequences of phase “a" given as follows: Vao = 20045° V Vai = 2052 – 30° V Vaz = 1534196° VGiven the following phase currents: Ia= 3.5+j3.5; Ib=-j3; and Ic+-2.6+j1.5. Determine the negative sequence current for phase A. A. 0.313+j0.678 B. -0.313 -j0.678 C. -0.313+j0.678 D. 0.313-j0.678The figure shows a 3-phase bala Time left 1:06:30 200 /00 Vrms. sequence electrical system. Vcn Vbn %3D al Balanced (-) sequence 100 so a 2000 Vms Select one: O a. 200 /-120 Vrms O b. 200 v2 /0 Vrms O C. 200 /0 Vrms O d. 200 v2/-120 Vrms e. 200/120 Vrms
- The phase voltages across a certain load are given as: Va = 176 – j132 volts Vb = -128 - j96 volts Vc = -160 + j100 volts Va1 = 163.24-j35.10 / 166.97L-12.135 Va2 = 50.1-j53.9 / 73.59L-47.09 Va0 = -37.34-j42.67 / 56.70L-131.19 Compute for positive, negative, and zero sequence components of voltage.In a star connected three-phase balanced (RYB) system, the phase angle between phase voltage ( VR )and phase voltage ( VY ) phase voltage is a. 180 degree b. 120 degree c. 30 degree d. 90 degree3) Write the AC node voltage equations for the following circuit. There is one independent current source and one independent voltage source both with frequency 2000 rad/sec and zero phase shift. Do not manipulate the equations, but put a box around each equation. You should have the same number of boxes as unknowns. 2 ko 20 mH 4 k. 10nF 10 cos(2000t) V 2 cos(2000t) mA
- The phase b voltage and the phase b current of a balance three-phase system are V = 220 sin (wt + 210°) and I = 10 sin (wt-180°). * A. 5256.44 W B. 5514.38 W C. 5715.76 W D. 6049.22 WTwo reverse parallel scr are used to control the voltage on a 10 ohm load over a 230V, 50HZ 1- phase AC source, and triggering is done at 3O degrees for positive alterance. Calculate the effective (rms) voltage on the load. a) 230.34V b) 226.64V c) 220V d) 110.56V e) OVIn an installation there is a three-phase load of 300 kVA with a power factor of 0.8 behind, in parallel with a three-phase load of 150 kVA with a power factor of 0.6 ahead. A pure reactive element is connected in parallel, and a unity power factor is obtained at the power input. Indicate the reactant of the element, with a positive sign if it is a bank of reactors, or with a negative sign if it is a bank of capacitors. Just put the corresponding sign followed by the numerical value, without units. The numerical value must correspond to the three-phase kVARS. You can use integer values with no decimal places or up to two decimal places