block diagram of the electromechanical energy conversion of a power tool
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- A 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.The voltage v(t)=359.3cos(t)volts is applied to a load consisting of a 10 resistor in parallel with a capacitive reactance XC=25. Calculate (a) the instantaneous power absorbed by the resistor, (b) the instantaneous power absorbed by the capacitor. (c) the real power absorbed by the resistor, (d) the reactive power delivered by the capacitor, and (e) the load power factor.Which termination would result to a phase change of 180 degrees at the load if Zo = 100 ohm? a. 50 ohm b. short circuit c. 75 ohm d. all of these What is the purpose of impedance matching? a. maximum return loss b. maximum SWR c. maximum load power d. maximum reflection A short piece of transmission line that may be open or shorted and used for impedance matching purposes. a. converter b. decoder c. stub d. transformer
- 1-Which function we call for three phase short circuit occurs in synchronous generator armature terminals at no load condition a.symshort b.lgfault c.llfault d.symfault 2-The FACTS devices support to control a.susceptance b.reactive power c.real power d.apprant powerConsider a 10 kVA, 200/400 V, 50 HZ: single-phase tranformer has the folloving test results:0.C. test: 200 V, 0.6A, 63 W (L.V.side)S.C. test : 20 V, 25A, 85 W (H.V. side)Deternine:i- The eficiengy at 75 % offiull-load at 0.9 leading power factor.ii -The secondary terminal voltage on fill-load at tunity power factonPlease answer all subparts for like either dislike is ready at least 5 subparts... A 3-phase, 450 V, 2-pole, 50 Hz, wye-connected, synchronous alternator. Xs = 1.62 ohm/phase. Connected to an infinite bus and supplies 120 kW with a power angle of 35 degrees.Neglect losses and find:a. turbine torque supplied to alternator.b. excitation voltage.c. active, reactive power and machine power factor.d. neglecting saturation effects of the field, the excitation voltagee. if the field current is reduced to 80% of its original value in part a.f. the turbine speed for 60 Hz operation.
- Please answer quickly "In series-connected ac circuit, the total voltage across the circuit is always equal to the sum of the magnitude (only) of the individual voltage across each element." True False The power factor is equal to cosine of the phase difference. True False A leading power factor means that the circuit is predominantly capacitive in nature. True False "Since most loads are resistive in nature (e.g. motors), improvement of power factor is done by connecting capacitor banks or a synchronous condenser " True FalseA 3-phase, star-connected alternator generates 6,360 V per phase and supplies 500 kW at a p.f. 0.9lagging to a load through a step-down transformer of turns 40 : 1. The transformer is delta connected on theprimary side and star-connected on the secondary side. Calculate the value of the line volts at the load.Calculate also the currents in (a) alternator windings (b) transformer primary windings (c) transformersecondary windings.Is G(s) a system with a non-minimum phase? Specify your reason.
- (as fast as possible please)-50kVA, 380V, 3-phase, 50Hz, star connected, 4-pole (2p = 4) round-rotor synchronous generator has 0.6 Ω synchronous reactance (Xd = 0.6 Ω). (Internal resistance is negligible (Ra = 0))a. Draw the equivalent circuitb. Calculate the nominal currentc. Calculate the excitation voltage at full load for Cos ϕ = 0.86 (inductive).D. Draw the phasor diagram and plot the relevant angles (ϕ, β, ψ)to. Calculate the power induced in the machine.f. Calculate the moment induced in the machine.Given:1. 10 Pole, wye-connected three-phase alternator2. 240 slots 3. 4 turns per coil (lap coils)4. 16/24 pitch5. 8460000 maxwell flux per pole6. 1670 rpm, alternator driven speed Determine the total line - to - line generated voltage. Please show the detailed formula and solution.A single-phase power system consists of a 450-V 60-Hz generator supplying a load-bank consisting of three loads (L1, L2 and L3) through a transmission line of impedance Z line=0.22+j0.43 as shown in Figure 1. A transformer (T1) with turn ratio N1:N2 is connected in the source end. Another tapping transformer (T2) with turn ratio M1:M2 is connected in the load end with a switch (K1). The switch can be connected to any of the tapping location: a, b or c. The load bank is connected with the system through another switch (K2). This switch can be connected to any of the load: L1, L2 or L3. Only one load can be connected at a time. There is a Control Box (C.B.) in between K1 and K2. It is designed in a way that if K2 is connected with a load (L1, L2 or L3) based on the demand of the consumer, it will trigger K1 to connect with any of the tap of T2 (a, b or c), based on the required power by the load. Consider that the power loss in the CB is negligible Load 1 (L1): Light load, 200W…