1.4 Electrical circuit diagram R 3-phase 380 V, 50 Hz S T C.B. L 1-phase 220 V, 50 Hz Fuse KF KR Stop E OL (ISIO O.L. Start Start KF KR F R KR KF vw KF KR
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- A 5-ohm resistor is connected in series with a 25 micro-farad capacitor. A source voltage of158 volts, 50 Hz supplies the combination. Determine the following:a. Circulating currentb. Voltage across the resistorc. Voltage across the capacitord. Real power supplied by the sourceQ2/3-phase.E.W.C. R using center tap transformer supplies highly inductive load, find: 1. The average load voltage with and without FWD and discusses these cases. 2-lf firing angle equal to 45°, the supply voltage is240v, transformer ratio is (2/1). Calculate the DC current& voltage of this case. 3- Draw all waveforms diagram. 4- what are the difference between the type of connection (Delta or Star).١-The PMSM used in the industry due to: a- Their low noise. b- Their easy control arrangement. c- Their efficiency. 2- The BLDCM used in the industry due a- Their low noise. b- Their easy control arrangement. - Their efficiency. 3- The (PMSM) supplied by: a- DC voltage. b- AC voltage of sinusoidal waveform. C- AC voltage of trapezoidal waveform. Choices
- Q1. a) An SCR based AC power controller circuit is given in Figure 1. The circuit connects a 240V 50Hz AC source vi to a resistive load with resistance of 100. If the delay angle is a-15°, draw the waveforms of the load voltage Vo, and the voltage across SCR2. Calculate the power supplied to the load. + Vi Va + 2 SCR2 H₁₁ SCR₁ Figure 1 SCR based AC power control circuit Va + 2 io b) Figure 2 is a single phase 2-level voltage source converter (VSC) with a DC voltage Vd-200V. A PWM scheme, by comparing a reference value with a 10kHz triangle waveform, is used to control the switches S₁ and S2. The modulation index of the PWM is m=0.8. With the aid of graphs explain how pulse signals for the switches are generated, sketch the output voltage Vo, determine the duty cycle, and calculate the average output voltage. + Vo + Vo √ ₂ == Figure 2 A single phase VSCWhat will happen to the value of the impedance if the resistance will be increased or decreased? Explain...There era two type of currents, a. direct current and b. alternating current. For each of these type, name as many as you can the specific application and discuss them as to their effectiveness And safety.
- Explain the concept of power quality in electrical systems and the potential issues that can arise, such as voltage sags, harmonics, and flicker.Identify the characteristics of AC and DC voltage. Runs at a higher temperature Answer 1Choose...DCAC More dangerous to transfer Answer 2Choose...DCAC Easy to produce Answer 3Choose...DCAC Easier to transform voltages Answer 4Choose...DCAC Voltage remains at a constant value Answer 5Choose...DCAC Cheaper to produce2
- (a) Define power factor and describe the characteristic of current and voltage in capacitive circuit. Include the respective power triangle diagram and labels.13. At what amperage differences will a GFCI trip? 14. What do DC and AC stand for? 15. True or False: An electron holds a positive chargesolar cells short circuit current, Isc-5A and open circuit voltage, vo.c.-D0.6. * The power delivered by a solar cell is Between 2.295 & 2.565 Between 2.565 & 2.6 ) Between 2.04 & 2.565