Transformer Selection and Application Quiz

What is the most common method utilized by utility companies for three-phase service?

• Using a single three-phase transformer unit

• Using two single-phase transformer units

• Using four single-phase transformer units

• Using five single-phase transformer units

Why is banking three single-phase transformers considered more economical?

• It requires less maintenance

• It is less expensive to replace one transformer in case of trouble

• It provides higher voltage output

• It requires fewer connections

What is the responsibility of the lineworker when selecting single-phase transformers?

• To determine the installation date

• To select the proper transformers and make the proper connections

• To paint the transformers

• To design the transformer

What is the kVA rating of a transformer used for?

• To determine the color of the transformer

• To determine the size of the transformer

• To determine the weight of the transformer

• To determine the installation date

What should be done before selecting any transformer?

• Painting the transformer

• Testing it

• Weighing it

• Measuring its height

What is a general rule for transformer banks with Wye connected secondaries?

• They should be painted blue

• They should have a kVA rating on the nameplate

• They should be installed outdoors

• They should be installed in pairs

What is the focus of the section mentioned in the document?

• The installation of transformers

• The banking of single-phase transformers to provide three-phase services

• The painting of transformers

• The design of transformers

Why is it important to use transformers of the same polarity in a bank?

• To increase voltage output

• To prevent confusion and safety concerns

• To reduce manufacturing costs

• To improve energy efficiency

What is the polarity of transformers rated 200 kVA and smaller?

• Additive polarity

• Subtractive polarity

• Neutral polarity

• Positive polarity

What is the result of a reversed polarity on one transformer of a three-phase bank?

• Increased efficiency

• High current flow

• Reduced voltage

• Improved safety