1. Three identical transformers rated 2 KVA, 120/120 volts 60 hz.. The primaries are connected in delta and the secondaries are connected in wye. (a) Draw the circuit and (b) complete the table below for the rated values: Phase voltage Phase current Line voltage Line current Primary secondary
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- Three single-phase two-winding transformers, each rated 3kVA,220/110volts,60Hz, with a 0.10 per-unit leakage reactance, are connected as a three-phase extended autotransformer bank, as shown in Figure 3.36(c). The low-voltage winding has a 110 volt rating. (a) Draw the positive-sequence phasor diagram and show that the high-voltage winding has a 479.5 volt rating. (b) A three-phase load connected to the low-voltage terminals absorbs 6 kW at 110 volts and at 0.8 power factor lagging. Draw the per-unit impedance diagram and calculate the voltage and current at the high-voltage terminals. Assume positive-sequence operation.A single-phase l0-kVA,2300/230-volt,60-Hz two-winding distribution transformer is connected as an autotransformer to step up the voltage from 2300 to 2530 volts (a) Draw a schematic diagram of this arrangement, showing all voltages and currents when delivering full load at rated voltage. (b) Find the permissible kVA rating of the autotransformer if the winding currents and voltages are not to exceed the rated values as a two-winding transformer. How much of this kVA rating is transformed by magnetic induction? (C) The following data are obtained from tests carried out on the transformer when it is connected as a two-winding transformer: Open-circuit test with the low-voltage terminals excited: Applied voltage =230V, input current =0.45A, input power =70W. Short-circuit test with the high-voltage terminals excited: Applied voltage =120, input current =4.5A, input power =240W. Based on the data, compute the efficiency of the autotransformer corresponding to full load, rated voltage, and 0.8 power factor lagging. Comment on why the efficiency is higher as an autotransformer than as a two-winding transformer.1.a. For performing dielectric-strength tests on insulating materials, two transformers are connected in aA. parallel combination.B. cascade arrangement.C. polyphase arrangement. 1.b. In large power transformers, the unequal voltage distribution caused by voltage surges in the winding isprevented by the use ofA. static shields.B. series capacitors.c. low-voltage arresters.
- AC power of 100 volts and 1 ampere enters a transformer with 2 coils and exits the transformer with 20 coils. What is the exiting voltage and current? a.) 1000v/0.1amp b.) 0.1v/1000amp c.)1000v/1amp d.) 2v/20amp e.) No changeQuestion 10 Not yet answered Marked out of Previous page BE The results from the DC test of a single phase transformer are: Vdc-14v and ldc 1.5A, the DC resistance are equal to: O a. O b. OC. O d. 12.50. 8.450 9.3302. 16.250. Time left 0:26:1 hp Next pageVoltage control method connected across the load, to supply part of VAR required is ..... O Shunt capacitor O tap changing transformer O series capacitor O booster transformer
- Two transformers A and B have the following data Transformer A: 6600/440 V, (250 KVA ) requires ( 6%) of rated voltage to circulate (90%) of full load current at power factor (0.25) when the low voltage winding is short circuited and the no load loss is equal to (2500 W). Transformer B: 6600/420 V, (600 KVA) requires (9%) of rated voltage to circulate (80%) of full load current at power factor (0.16) when low voltage winding is short circuited and no load loss is equal to (4500 W). Calculate the followings: If both transformers are connected in parallel to supply a load (1.2 + j 2.3) ohm, find the output power of each transformer.Two transformers A and B have the following data Transformer A: 6600/440 V, (250 KVA ) requires ( 6%) of rated voltage to circulate (90%) of full load current at power factor (0.25) when the low voltage winding is short circuited and the no load loss is equal to (2500 W). Transformer B: 6600/420 V, (600 KVA) requires (9%) of rated voltage to circulate (80%) of full load current at power factor (0.16) when low voltage winding is short circuited and no load loss is equal to (4500 W). Calculate the followings: The terminal voltage when transformer A is supplying half load at power factor (0.6) lagging and transformer B is supplying (85%) of full load at power factor (0.85) leading.What is the influence of transformer connections in single-phase transformers connected for 3- phase operation
- 12.a. Comparing the transformer cores of core-form and shell-form transformers shows that thea. shell form provides lower reactance without increasing the transformer size.b. core form makes possible wider coils and better oil circulation.c. shell form is used exclusively in small low-voltage transformers.12.b. Distribution transformers are generally protected from damage due to excessive internal temperatures,by the operation of aA. lightning arrester.B. circuit breaker.C. surge diverter.- Transformers and Special Locations 7.a. Dry-type transformers are available in what configuration(s)?A. Single-phase or auto-phaseB. Poly-phase onlyC. Single- or poly-phaseD. Single-phase only7.b. How many separate and distinct electrical systems does an essential electrical system consist of?A. FiveB. ThreeC. FourD. SixQ8) Which of the following statement is true about Current Transformer? a. The current in the secondary winding is more than primary winding. b. No of turns in primary winding are less than secondary winding c. No of turns in primary winding are more than secondary winding. d. The voltage in the secondary winding is less than primary winding.