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- The real power delivered by a source to two impedances, Z1=4+j5 and Z2=10 connected in parallel, is 1000 W. Determine (a) the real power absorbed by each of the impedances and (b) the source current.A rural electric line supplies power to two industries by means of step-down transformers. Both plants use the same voltage, but one plant take much power than the other. What differences in design are there in the transformers supplying these industries? Explain why.A 100 KVA, 500 V/200 V, 1-0 transformer when excited at rated voltage on h.v. side, draws a no- load current of 3.0 A at 0.8 lagging power factor. If it is excited from the l.v. side at rated voltage, the no load current and power factor will be respectively,
- 6.5% ans ex A so kvA. 2o00/20 V, So He single-phase transformar has impedance drof of8% and resistance drop of 4%. Caleulate. The Requlation of the Thams former at full- Load o8 P.s Legging. also find The Power factor at which Voltage requlation will Be Zero. Sols 0.5 leading. s alculate The % Noltege Requlation af atransformar in w hich the Percantage resistance drof is 1% and Percentage dre is 6% when The Power fador is 0.8 lagging ) > unity aMS 38 % ans 1 % (シ→ 0.8 leading . amS - 2.2%The impedance ZL in the circuit shown in Figure is adjusted for maximumaverage power transfer to itself.(a) What should be the value of ZL?(b) What is the maximum average power delivered to ZL?(c) What percentage of the average power delivered to the linear transformer is delivered to ZL?Two 7970-V:230-V single-phase transformers with impedance with respect to their secondaries of 1.5 + j3 and 2 + j4.5 ohms are connected in parallel to a 7900-V source. Their secondaries are supplying a common load of 30 + j40 ohms. A. What is the magnitude of the voltage across the load in volts? (2 decimal places) B. What is the magnitude of the total current supplied by the 7900-V source in amperes? (3 decimal places) C. What is the efficiency of the parallel transformers combined in percent? ( 1 decimal place)
- One side of a transformer has What is the voltage (in V rms) at the secondary? 1,800 turns while the other side has 450 turns. The high voltage side is connected to a 240 Vrms source. The low What is the current (in A rms) at the secondary? What is the current (in A rms) out of the source? What is the value of the load impedance when referred to the primary? • Referred impedance = voltage side (secondary) is connected to an impedance ZL = 20 + j10 Q. Provide at least 4 digits after the decimal point. +j_ N What is the value of the source voltage (in V rms) when referred to the secondary?In Transformers: a. What is the relationship between the turns ratio and the primary to secondarycurrent ratio ? b. What is the relationship between the turns ratio and the primary and secondaryvoltage ratio? c. What can you conclude about the relationship in the values of primary andsecondary apparent power?Two single-phase transformers whose phase electrical equivalent circuits are given below are connected in parallel and ZL= 0.8+j0.6 ohm is feeding a worth of load. Idle operating voltage of Transformer 1 is 220 V and Transformer 2 idle operating voltage is 240V. a.) Find the currents flowing from transformers to the load. b.) Find the active powers that transformers transfer to the load.
- A transformer is needed that will cause an appear as 240 Vyms. actual load resista nce of 252 to 100R to an ac voltage source of ca) Dyews the diaggaam of the cuf. reguired. cb) what tuons ratio is required for the tounsforma. C) Find the currenttauen from the source the cuorent flowing through the load, and the load voltope load voltage-You want to feed a load that works at 100Vrms and consumes 2KVA with a lagging power factor of 0.8. To supply the load, a transformer is required whose equivalent circuit is shown in figure b) and two sections of transmission lines shown in figure c). The general feeding scheme is shown in figure a). Without using the mesh or node methods, determine the power triangle of the power supply.A load of 1600 kW at 0-8 p.f. is shared by two 1000 kVA transformers having equal turn ratios and connected in parallel on their primary and secondary side. The full load resistance drop is 1% and reactive drop is 6% in one of the transformers, the corresponding values in the other transformer being 1.5% and 5%. Calculate the power and power factor at which each transformer is operating.