Identify the low voltage system from the following. a. primary distribution b. Secondary distribution c. Generation
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- The main advantage of A.C. systems over D.C. systems is: a) transformers can be used to change D.C. to A.C. IRtransformers can be used to change voltage levels. b) , 00 transformers can be used to change A.C. to D.C. d) ) transformers can be used to change power levels.1. A resistor, in series with a 138-microfarad capacitor, is connected to a 60-cycle source. If the voltage drop across the capacitor is 115 volts and the power taken by the circuit is 922 watts, calculate (a) the circuit current, (b) the ohmic value of the resistor, (c) the line voltage, (d) the circuit power factor. Please show complete solution and the circuit diagram. Please round off answers up to the 3rd decimal place. Thank you!What is the main direct cause of reactive power in AC system?A. Resistance of transmission linesB. Inductance and capacitance in the loadsC. Ideal transformer connected in the systemD. Power produced by generator
- Problem 1 - Series en Parallel AC networks [19] Look at the circuit in Figure 1 and determine the following: (a) Total Admittance. (b) Total Impedance. (c) Total Current (l:). (d) Current (I1) through impedance Z2. (e) Current (12) through impedance Z3. (f) Current (I3) through impedance Z4. (g) Is this an inductive or capacitive circuit? A. B Zs 220V;50HZ Figure 1 (h) Voltage across Z1. (i) Voltage across A and B. G) Voltage across Zs. Z1 = 3 + j5 ohm Z2 = 10 + jo ohm Z3 = 5 + j15 ohm Z4 = 10 – j30 ohm Zs = 20 – j30 ohm Admittance and Impedance in rectangular notation. All currents and voltage in polar notation. Take voltage as reference.a.) How the improvement of the power factor decreases the line losses in the AC distribution system and increases the capacity of power transfer in the existing distribution system. Explain with the help of the figure. b.) What is the effect of power factor improvement on the DC distribution system? Draw a basic architecture of the AC and DC distribution system.26: For the circuit shown Find: 1. Turn ratio "n" for max. power 120ov delivered to (2OKQ) resistor. 2. Maxi. power delivered to the load. 82 V: 32 fideal (Ans.: n=50 & Pm=4.5W)
- The recommended limit of voltage drop on a power circuit for a single-phase supply as per IEE Wiring regulations is equal to 12 V. Then the value of supply voltage is a. 200 V b. 400 V c. 240 V d. 230 V1. Explain the reasons for the low power factor in the power system networkGrounding methods in Power systems
- Which of the following statement is true? a. 2 wire ac distribution line has only resistance . b. 2 wire ac distribution line has only capacitive reactance.. c. 2 wire ac distribution line has inductive reactance. d. 2 wire ac distribution line has doesn't have any inductive reactance.1. Draw a schematic diagram for electrical networks from generators to the consumers with their connections and Show transmission, sub transmission and distribution sections in this figure. Show each sections voltage level. Show transformers voltage level. Show the number of wires in each section. Also shows the final single phase/three phase consumers connection to the low voltage systems.What is the main direct cause of reactive power in AC system?A. Resistance of transmission linesB. Inductance and capacitance in the loadsC. Ideal transformer connected in the systemD. Power produced by generator2. “Reactive power in a system is dissipated generally as thermal energy?”A. TRUEB. FALSE3. Which of the following statements are correct for three phase circuit:A. Sum of all the three phase currents is zero in unbalanced networkB. Total power transfer to load is constant with timeC. Neutral conductor is same size in terms of material used as in single phase conductorsD. Net apparent power consumed is equal to real power