The winding ratio of which transformer type is 3:1?

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Study for the BCTC Industrial Maintenance Technology AMTEC – NOCTI Mechatronic Assessment. Prepare with comprehensive question sets and detailed explanations. Ensure success with our targeted practice!

Multiple Choice

The winding ratio of which transformer type is 3:1?

Explanation:
In an ideal transformer, the voltage ratio equals the turns ratio: Vp/Vs = Np/Ns. A winding ratio of 3:1 means the primary has three times as many turns as the secondary, so the secondary voltage is one third of the primary (Vs = Vp/3). That is exactly what a step-down transformer does—reduces voltage. A step-up would require the inverse ratio (1:3) to raise voltage. An isolation transformer typically uses equal turns (1:1) to isolate without changing voltage. An auto transformer uses a single winding with a tap and can provide various ratios, but the fixed 3:1 setup described corresponds to a step-down arrangement.

In an ideal transformer, the voltage ratio equals the turns ratio: Vp/Vs = Np/Ns. A winding ratio of 3:1 means the primary has three times as many turns as the secondary, so the secondary voltage is one third of the primary (Vs = Vp/3). That is exactly what a step-down transformer does—reduces voltage. A step-up would require the inverse ratio (1:3) to raise voltage. An isolation transformer typically uses equal turns (1:1) to isolate without changing voltage. An auto transformer uses a single winding with a tap and can provide various ratios, but the fixed 3:1 setup described corresponds to a step-down arrangement.

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