9.8 An eight pole, 3-phase, 60° phase-spread, double layer winding has 72 coils in 72 slots. The coils are short-chorded by 2 slots. Calculate the winding factors for the fundamental and the third harmonic.
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- 6. A 1-phase full converter delivers ripple free current to RL load with R=1592. The source voltage is 230V, 50Hz, for a=30°. Determine rectification efficiency, voltage ripple factor displacement factor, and power factorThe step down DC chopper uses DC source voltage V(dc) = 200 V and resistive load impedance of 10 ohm. The duty cycle is 0.4 the voltage drop across the switch may be taken as zero, Calculate : (a) Average and RMS value of output voltage. (b) Average and RMS value of output current.1. Impedance is the total opposition to an AC circuit caused by electric penalty tions, the tra capa multiple pacitive systema 62 Fundamentals of AC Electricity Questions for This C a. 1. Draw a diagram of an AC sine wave and identify its peak voltage and peak-to-peak voltage levels. b. 2. Explain the term frequency as it refers to AC electricity. c. 3. Discuss the difference between a load center and a fused disconnect. 2. WE wa 4. Explain how you would test for voltage in a fusible dis- connect on the line-side and load-side terminals. vi ci 5. Trace the path of a generated AC voltage from the generat- ing station where it is produced to the point where you would connect it to a machine in a factory. Be sure to iden- tify all the important parts of the system between the gen- eration station and the disconnect on the machine. a. be 3. True or False inductive reactance, capacitive reactance, and resistan 2. The units of impedance are
- Q9. What is the basic principle that a cage winding can be represented by a three-phase winding? Give your explanation.Please solve , last time i got wrong answerDesign a flyback converter for an input of 24 V and output of 40 W at 40V. Specify the transformer turns and magnetizing inductance, switching frequency and capacitor to limit the ripple voltage less than 0.5%.
- A transformer has primary and secondary turns of 1250 and 125 respectively. It has core cross-sectionof 36 cm2 and its rms flux density is to be limited to 1.4 T (to prevent core saturation). Whatmaximum 50 Hz voltage can be applied on the primary side and the corresponding open-circuitsecondary voltage?The core has a mean length of 150 cm and its relative permeability can be assumed to be 8000. Whatwould be the rms exciting current when the transformer’s primary winding is excited at a voltage ascalculated above? Also calculate the magnetizing susceptance as seen from primary and secondarysides.If the transformer were to be excited at 60 Hz, 1. What should be the maximum primary voltage for thecore flux density limit not to be exceeded? 2. What would be the magnetizing susceptance as seen oneach side in this case?The windings of an 11500/2300V two winding transformer are connected in series, with 11500 V as the supply to the primary, to create an autotransformer. What is the voltage output of the resulting step-up autotransformer when Ip and Is are 10 A and 50 A, respectively?The primary winding of a 220/6 V, 50 Hz transformer is energized from 220 V, 60 Hz supply. The secondary output voltage will be *