Exam 29: Three-Phase Transformers

A wye-delta transformer has a turns ratio of 2:1. It has a secondary line voltage of 480 V. The secondary is connected to a wye-connected three-phase resistive load of 50 Ω in each phase. What is the current flow is in each load resistor?

(Multiple Choice)

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Question 21

An open delta transformer is assembled from two 50 kVA transformers. The output power of the open delta is _____.

(Multiple Choice)

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Question 22

An open delta transformer is assembled from two 150 kVA transformers. The output power of the open delta is _____.

(Multiple Choice)

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Question 23

If three-phase transformation is needed and a three-phase transformer of the proper size and turns ratio is not available, three single-phase transformers can be connected to form a _____.

(Multiple Choice)

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Question 24

A wye-connected secondary has a phase voltage of 277.14 V. What is the line voltage?

(Multiple Choice)

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Question 25

Showing 21 - 25 of 25

A wye-delta transformer has a turns ratio of 2:1. It has a secondary line voltage of 480 V. The secondary is connected to a wye-connected three-phase resistive load of 50 Ω in each phase. What is the current flow is in each load resistor?

An open delta transformer is assembled from two 50 kVA transformers. The output power of the open delta is _____.

An open delta transformer is assembled from two 150 kVA transformers. The output power of the open delta is _____.

If three-phase transformation is needed and a three-phase transformer of the proper size and turns ratio is not available, three single-phase transformers can be connected to form a _____.

A wye-connected secondary has a phase voltage of 277.14 V. What is the line voltage?

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