# Three – Phase Transformer connections – Exercise – 1

Exercise – 1

1. For the star-star connection of three phase transformer, the phase angle between the phase voltages and line voltages on both primary and secondary side is : (a) 0 degree (b) 30 degree (c) 60 degree (d) 120 degree

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2. The phase shift in a star-star connected three phase transformer is : (a) 0 degree (b) 30 degree (c) 60 degree (d) 120 degree

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3. For the parallel operation of three phase transformers, which among the following connection is not applicable? (a) Δ – Δ to Y – Y (b) Y – Δ to Δ – Y (c) Y – Y to Y – Y (d) None of these

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4. For large low voltage transformers, the most commonly connections used are : (a) Star- star connection (b) Delta-delta connection (c) V connection (d) All of these

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5. If K is the transformation ratio, then the secondary phase voltage of delta-delta connected three phase transformer will be : (a) 1 / K times of the primary phase voltage (b) Equal to the primary phase voltage (c) 1 / K ∧ 2 times of the primary phase voltage (d) K times the primary phase voltage