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- Use the information below to answer questions 24 und 25. The voltage across and the current through a load are (10+ j5Y and (2-jiArespecively. 24. What is the reactive power in VArconsumed? D. 0 A. 15 C. 20 D. 25 25. What is the pawer factor of the load? A. 0.8 leading B. 0.8 Jagging. -D. 0.6 ligging C 0.6 leadingThree Impedances each of (8 - j24)2 are connected in mesh across a three-phase 420V ac supply. Determine the phase current, line current, active power, reactive power drawn from supply. Also draw the Phasor diagram for the mesh connection and marks the Line current ,phase current line voltage and phase angle between phase current and pahse voltage. phase current (Ip) Line current real power reactive powerIf a A-connected load has a balanced impedance ZA 94 - 17° 2 and a voltage = = / VBC = 265 82° V rms, what is the magnitude of the current Ia (in A rms)? C V cn Van a Answer: n Von b Ia Ib 20 B IAB IBC ZA ZA ICA C
- 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 Wc) Drive the expression for maximum phase leads of m given network V. in R₁ min C₁ wwww R25. The figure below shows two star connected loads with three phase power. The voltage source is 120Z0°. The loads are Z₁ = 10 + j4 № and Z₂ = 2 +j3 №. The cables are negligible. Calculate: a) the line and phase current. b) the real power from the source. c) the reactive power of the circuit. Is V N Z₁ Z₁ Z₁ Z₂ Z₂ N N Z₂
- A load has a leading power factor. a) Is it a capacitive or inductive load? b) Is the reactive power positive or negative? c) Repeat for a load with lagging power factor2. A voltage applied to a load is V=208420°V and current through load is I=10 &-10° A. Find the following [SO 1] o complex power consumed by load • Is the load inductive or capacitive? o the power factor of the load o the reactive power consumed or generated by the load. o Does the load consume or supply reactive power? 3. A single phase motor draws 20 kVA at 0.70 lagging power factor from a 120 V source. The PUD desires to improve the power factor to 0.9 lagging by connecting a shunt capacitor bank across the terminals of the motor. Determine the size of the capacitor bank in VARS. Calculate the following: [SO 1] a) What are the initial load current, real and reactive powers of the load? b) What are the real and reactive power after adding the capacitor bank? c) What is the kVAr rating of the capacitor bank? (3) d) What is the load current? di) How is the load current affected by the load reactive power?In balanced 3phase system the Sequugace is Positive andaline VOltage Vbe=208/-70V Fte toet is balancetalsoYin farallel with Arthe phase impedaacesof the tuwo load are 51362210, The line impedance is l4ija82 . Draw the Singte phase equivelent circuit and useK to the load in the a-fhase Find total Pawer lass in tine. 3-19.214 esfectively catculate'the Line Voltage at
- Given 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-j0.678A balanced load is connected in star across a 3 phasec415V 50Hz supply. The load consists of a coil of resistance 25 ohms and inducrance 0.5 henry in paeallel with a purw resistance of 28 ohms and a pure capaciror of 60microfarads capacitance ,in each branch. Calculate a. The line currents? Need full working and answer has to be 9.3A Formola for inductance XL= 2×3.142FL FORMOLA FOR CAPACITOR XC= 1/2×3.142×FCLine Voltages at the terminal Pz:- The of abaancat Y conmected load is----- Each Phase of the load cousist of loL30 S2 Find the active s Reactive and somflex Power fer Phase then Find the total load. Var=12010, Powers for Heree phase