In a delta to star connection of transformer one of the following is true

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 2

Answer 1

Delta – star connection type three-phase transformer is used for both large and low voltage rating transformers.
Delta – star transformer is used at the generator side to step up the voltage levels and Star – delta transformer is used at the load side of distribution systems to step down the voltage levels.
Star – star connection transformers are used for small, high voltage transformers.
Delta – delta connection transformers are used for large, low voltage transformers.

Additional InformationAs the line voltage is √3 times of the phase voltage, hence star connection is used to give the output.