First slide

Electrical machines and devices

Question

The transformation ratio in the step-up transformer is

Moderate

A

1
B

Greater than one
C

Less than one
D

The ratio greater or less than one depends on the other factors

Solution

Transformation ratio $k = \frac{N_{s}}{N_{p}} = \frac{V_{s}}{V_{p}}$
For step-up transformers, $N_{s} > N_{p} i . e . V_{s} > V_{p},$ hence $k > 1 .$

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