1. Delta-wye and wye-delta configurations both produce a. increases in the secondary voltages and currents. b. decreases...

1. Delta-wye and wye-delta configurations both produce

Transcribed Image Text:

a. increases in the secondary voltages and currents. b. decreases in the secondary voltages and currents. c. phase shifts between the incoming and outgoing line voltages. d. additional V3 increases in the secondary voltages and currents. 2. The line voltage at the secondary of a 10:1 wye-delta connected transformer will be a. equal to the line voltage at the primary times 1/V3. b. equal to the line voltage at the primary times v3. c. equal to the line voltage at the primary times 0.1 times 1/v3. d. equal to the line voltage at the primary times 0.1 times v3. 3. The line voltage at the secondary of a delta-wye connected transformer is a. greater than it is with a wye-delta connection. b. less than it is with a wye-delta connection. the same as it is with a wye-delta connection. d. only dependent on the turns ratio. C. 4. The sum of the phase voltages in three-phase transformers a. depends on the connection. b. equals zero when the transformers are properly connected. c. is v3 times the turns ratio. d. can only be determined when a load is connected to the secondary. 5. Before three-phase transformers are put into service a. the phase sequence of the incoming lines must be verified. b. the winding connections must be checked to ensure proper phase relationship. c. the load must be balanced. d. the phase shift must be measured. a. increases in the secondary voltages and currents. b. decreases in the secondary voltages and currents. c. phase shifts between the incoming and outgoing line voltages. d. additional V3 increases in the secondary voltages and currents. 2. The line voltage at the secondary of a 10:1 wye-delta connected transformer will be a. equal to the line voltage at the primary times 1/V3. b. equal to the line voltage at the primary times v3. c. equal to the line voltage at the primary times 0.1 times 1/v3. d. equal to the line voltage at the primary times 0.1 times v3. 3. The line voltage at the secondary of a delta-wye connected transformer is a. greater than it is with a wye-delta connection. b. less than it is with a wye-delta connection. the same as it is with a wye-delta connection. d. only dependent on the turns ratio. C. 4. The sum of the phase voltages in three-phase transformers a. depends on the connection. b. equals zero when the transformers are properly connected. c. is v3 times the turns ratio. d. can only be determined when a load is connected to the secondary. 5. Before three-phase transformers are put into service a. the phase sequence of the incoming lines must be verified. b. the winding connections must be checked to ensure proper phase relationship. c. the load must be balanced. d. the phase shift must be measured.

Answer rating: 100% (QA)

Answer 1 Deltawye and wyedelta configurations both produce phase shifts between the incoming and out... View the full answer