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- An industrial plant consisting primarily of induction motor loads absorbs 500 kW at 0.6 power factor lagging. (a) Compute the required kVA rating of a shunt capacitor to improve the power factor to 0.9 lagging. (b) Calculate the resulting power factor if a synchronous motor rated at 500 hp with 90 efficiency operating at rated load and at unity power factor is added to the plant instead of the capacitor. Assume constant voltage (1hp=0.746kW).chapter 1 Q1 The rms value the AC input voltage to the of Circuit shown is 230U, and the firing angle is maintained Current is 5 A. constant at 45° so that the load a) Calculate the de output voltage. b) Assume that the load resistance remains the a same, find the current is a FWD is used at the output. c) If^ prime prime ScR^ prime prime " is open circuited, find load voltage and current a is the Same) (FWD is still connected and high. "L Load Ans[146.4U,6.03A ; 3.c2A] 3 3 FWDA non-sinusoidal quasi-square wave voltage v(t) is applied to a nonlinear load, resulting in a non-sinusoidal current i(t). The voltage and current waveforms are shown below. Assume any values of your choice for Vp (≤ 200 V) and Ip (≥ 5 A). 1. calculate the average power and net power factor of the load. 2. The total load harmonic distrotion (THD) of the load current, assuming the smallest frquency term as fundamental.
- A transformer has a ratio of 4:1. The high voltage side is connected to a 240 Vrms source. The low voltage side (secondary) is connected to an impedance ZL = 20 + j10 Ω.a. (in Vrms) What is the value of the source voltage when referred to the secondary? b. (in A rms) What is the current at the secondary?c. (in V rms) What is the voltage at the secondary?The 9 Ω resistor in the circuit is replaced with a variable impedance Zo. Assume Zo is adjusted for maximum average power transfer to Zo. 1. a) What is the maximum average power that can be delivered toZo?2. b) What is the average power developed by the ideal voltage sourcewhen maximum average power is delivered to Zo?3. c) Choose single components from Appendix H to form animpedance that dissipates average power closest to the value in part(a). Assume the source frequency is 60 Hz.For the configuration shown in the figure below, determine Zi if Vs = 40 mV, Sense = 0.5 kΩ, and Ii = 20 µA
- Perform the following steps for the given circuit in below.c) Find the Av, if the Vs = 100mV_rms, IDSS = 12mA, VP = -4V, VDD = +12V, RD =3.6kΩ, RS = 1.1kΩ.d) Find the Vo, if a load resistance of 10kΩ is connected to the output of the circuit.Vs = 50mV_peak, IDSS = 12mA, VP = -4V, VDD = +12V, RD = 3.6kΩ, RS = 1.1kΩ.The variable resistor Ro in the circuit shown is adjusted until maximum average power is delivered to Ro.1. a) What is the value of Ro in ohms?2. b) Calculate the average power delivered to Ro.3. c) If Ro is replaced with a variable impedance Zo, what is themaximum average power that can be delivered to Zo?4. d) In (c), what percentage of the circuit’s developed power isdelivered to the load Zo?A transformer has a ratio of 4:1. The high voltage side is connected to a 240 Vrms source. The low voltage side (secondary) is connected to an impedance ZL = 20 + j10 Ω.a. What is the value of the load impedance when referred to the primary?b. (in A rms) What is the current out of the source?
- 1. A motor load consists of a resistance of 6 Ohms in series with an inductance of 12 mH. Assume 120Vac, 60 Hz supply. a. What is the complex impedance of the load? b. What is the ac current through this load? c. What is theta, the angle between voltage and current through this load? d. What is the power factor? e. What capacitance should be added in parallel with this load to correct the power factor to 1? f. What is the current from the supply when the power factor is corrected?Q6: An AC source operating at 60 Hz with a maximum voltage of 170 V is fed to a series combination of1.2kΩ resistor and 2.5μF capacitor connected in a timer circuit. How can you evaluate the maximumcurrent in the circuit? Can you estimate the rms value potential difference across each circuit element?Compare the power factor of this timer circuit with a circuit contain only ohmic resistance. Justify youranswer?Is it possible to measure the phase-shift angle in an AC single-phase circuit by an indirect method using an ammeter and a voltmeter? - Yes, but an instrument must be added to measure the active resistance of the load. - Yes, but an instrument must be added to measure the active power dissipated by the load. - Yes, but an instrument must be added to measure the frequency.