what are the conditions to be satisfied to use more than two CT'S in a differential protection scheme? chose one answer a, b, c or d ?? a. Both Current Transformers must have the Knee point and Ankle pint Voltage. b. Both Current Transformers must have the same Voltage, Current and Power ratings. C. All Answers are correct. d. Both Current Transformers must have the same Insulation Class.
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- A transformer is to be used to match an 8-Ωloudspeaker to a 500-Ω audio line. What is the turnsratio of the transformer, and what are the voltages atthe primary and secondary terminals when 10Wofaudio power is delivered to the speaker? Assume thatthe speaker is a resistive load and that the transformeris ideal.Which one of the following preliminary multistator watthour meter adjustments may be made while utilizing the series opposing connection of two current circuits ? A. Light-load adjustment B. Power factor adjustment C. Balance adjustment D. Full- load adjustmentA 300-kilovolt-ampere transformer bank consisting of three 100-kilovolt-ampere transformers has a 3-phase, 480-volt delta primary and a 120/240-volt, 3-phase, 4-wire delta-connected secondary.For problems 1 through 4 show calculations and/or source of information. 3. What is the proper rating of the fuses to install for overcurrent protection of the secondary?
- Under what circumstances the power transformer will act as a source of harmonic?Rated load contionSaturation condition3-ph Fault conditionNo load condition12. If overcurrent protection is provided in the transformer of a separately derived system, which of the following statements is correct?A. A ground electrode must be present at the transformer and the building's disconnect.B. There's no need for service equipment or a panelboard in the separate building.C. An equipment grounding conductor must be run with the conductors between the transformer and the building's disconnect.D. The neutral should be bonded to the equipment grounding conductor at the service equipment in the separate building.19.a. Four electricians are discussing guarding requirements for transformers. Electrician A says that awarning sign indicating the operating voltage of live parts on a transformer is required if the live parts areexposed. Electrician B says that dry-type transformers can be installed without an enclosure. Electric Csays that the warning sign indicates that the operating voltage is required for nonlive and live parts alike.Electrician D says that less flammable and liquid insulated have the same requirements for indoor andoutdoor installation. Which of the following statements is correct?A. Electrician D is correct.B. Electrician C is correct.C. Electrician A is correct.D. Electrician B is correct. 19.b. Four electricians are discussing transformers. Electrician A says that to ensure proper ventilation, therequired clearances aren't found on the transformer nameplate markings. Electrician B says that exposedlive parts on a transformer require the installation of a sign that indicates…
- An electrical lineman is connecting three single-phase transformers in a Y(primary)-Y(secondary) configuration, for power service to a business. Draw the connecting wires necessary between the transformer windings, and between the transformer terminals and the lines: Note: fuses have been omitted from this illustration, for simplicity.Three 1100/110-V transformers connected delta-delta supply a lighting load of 100 kW. One of the transformers is damaged and removed for repairs. Find (a) What currents were flowing in each transformer when the three transformers were in service? (b) What current flows in each transformer when the third is removed? and (c) The output kVA of each transformer if the transformers connected in open Δ supply the full- load with normal heating?Q1/ choose the correct answer The core type transformer is used for low voltage applications? Select one: True False
- 1- The recommended limit of voltage drop on a lighting circuit for a single-phase supply as per IEE Wiring regulations is equal to 6.3 volt. Then the value of supply voltage is a. 290V b. 250V c. 210V d. 230V 2- Which of the following statement is TRUE ? a. Resistance is not proportional to length of the material and Resistance is proportional to area b. Resistance is proportional to length of the material and Resistance is proportional to area c. Resistance is not proportional to length of the material and Resistance is inversly proportional to area d. Resistance is proportional to length of the material and Resistance is inversly proportional to area9. A three-phase transformer bank has the primary and secondary windings connected in a wye configuration. The secondary center tap is being used as a neutral to supply single-phase loads. Will connecting the center-tap connection of the secondary to the center-tap connection of the primary permit the secondary voltage to stay in balance when a single-phase load is added to the secondary? 10. Referring to the transformer connection in Question 9, if the center tap of the primary is connected to a neutral conductor on the incoming power, will it permit the secondary voltages to be balanced when single-phase loads are added? these two go together but i need them answered seperately please16. Flexible metal conduit will be installed between a raceway and a transformer in a system. If it's to serve as an equipment grounding conductor, the flexible conduit and its fittings must be less than _______ feet. A. 2 B. 6 C. 10 D. 4 17. In which of the following situations can an equipment ground conductor be run separately from the circuit conductors? A. When you install a GFCI and are connecting additional receptaclesB. When the connection is to be made to a nearby water pipeC. When you're replacing an ungrounded two-wire receptacle with a grounded receptacle D. When there are no spare conductors in the cable 18. A 400-amp circuit breaker protects a feeder that's installed in a nonmetallic raceway that requires an equipment grounding conductor. Which of the following is the minimum size of aluminum equipment grounding conductor that should be used in this situation? A. No. 4B. No. 1C. No. 6 D. No. 2 19. Which of the following is bonded to the grounding electrode system…