Topic Assessment 7 Parallel Operation of Transformers (60 min)_ Attempt review.pdf

26/08/2024, 22:49 Topic Assessment 7 Parallel Operation of Transformers (60 min): Attempt review Dashboard / My courses / EL25 - Test and connect transformers / Topic Assessments / Topic Assessment 7 Parallel Operation of Transformers (60 min)...

26/08/2024, 22:49 Topic Assessment 7 Parallel Operation of Transformers (60 min): Attempt review Dashboard / My courses / EL25 - Test and connect transformers / Topic Assessments / Topic Assessment 7 Parallel Operation of Transformers (60 min) Started on Monday, 19 August 2024, 12:02 PM State Finished Completed on Monday, 19 August 2024, 12:05 PM Time taken 2 mins 48 secs Marks 9.00/9.00 Grade 100.00 out of 100.00 Feedback Congratulations you have achieved 100%. Good luck with your continued studies. Question 1 Correct Mark 1.00 out of 1.00 Topic Assessment 7 Parallel Operation of Transformers Question 1 Review the statement/s carefully and indicate True or False. Statement True/False One advantage of paralleling is that separate energy banks of transformers provide continuity of service in True the event of preventive maintenance or emergency repair that requires removal of one transformer bank from  a service Your answer is correct. https://learn.sydneytafe.edu.au/mod/quiz/review.php?attempt=1610765&cmid=1441017 1/4 26/08/2024, 22:49 Topic Assessment 7 Parallel Operation of Transformers (60 min): Attempt review Question 2 Correct Mark 1.00 out of 1.00 Topic Assessment 7 Parallel Operation of Transformers Question 2 Review the statement/s carefully and indicate True or False. Statement True/False The following diagram depicts two single phase transformers with primary (HT) connected in parallel and secondary (LT) connected in series. False  Your answer is correct. Question 3 Correct Mark 1.00 out of 1.00 Topic Assessment 7 Parallel Operation of Transformers Question 3 What are the three connection considerations for parallel operation of three phase transformers? Select one: Delta connection, Phase sequence, Ratio sequence Equal polarity, Phase sequence, Ratio sequence Equal polarity, Phase sequence, Star connection Secondary voltage, Polarities, Regulation curves Your answer is correct. https://learn.sydneytafe.edu.au/mod/quiz/review.php?attempt=1610765&cmid=1441017 2/4 26/08/2024, 22:49 Topic Assessment 7 Parallel Operation of Transformers (60 min): Attempt review Question 4 Correct Mark 4.00 out of 4.00 Topic Assessment 7 Parallel Operation of Transformers Question 4 What are the FIVE conditions that must be satisfied before paralleling three phase transformers? Select one or more: The regulation curves must be similar The same primary current The same core type The secondary voltage The same polarities The same vector grouping The same phase sequence The same primary voltage Your answer is correct. Question 5 Correct Mark 1.00 out of 1.00 Topic Assessment 7 Parallel Operation of Transformers Question 5 What will happen to high circulating currents if the secondary terminals of the wrong polarity are connected together when paralleling single phase transformers? Select one: They will be set up in the secondary winding only They will be set up in both the primary and the secondary windings They will be set up in supply only They will be set up in the primary winding only Your answer is correct. https://learn.sydneytafe.edu.au/mod/quiz/review.php?attempt=1610765&cmid=1441017 3/4 26/08/2024, 22:49 Topic Assessment 7 Parallel Operation of Transformers (60 min): Attempt review Question 6 Correct Mark 1.00 out of 1.00 Topic Assessment 7 Parallel Operation of Transformers Question 6 Select the possible outcome for each result of incorrect transformer connections: Condition Outcome High voltage rises within the transformer windings and stress the end coils to Insulation failure voltages  Brittle, contaminated insulation High temperatures through the transformer  Transformer explosion Power infrequency arc  Your answer is correct. ◀︎Topic Assessment 6 Percentage Impedance (60 min) Jump to... Topic Assessment 8 Relevant Manufacturer Specifications (60 min) ▶︎ https://learn.sydneytafe.edu.au/mod/quiz/review.php?attempt=1610765&cmid=1441017 4/4