The output voltage is 15V and it is a step-down transformer.
To put it simply, a transformer is something that increases or decreases voltage. A step-up transformer increases the output voltage, whereas a step-down transformer decreases output voltage. To maintain the input and output power of the system equal, the step-up transformer will reduce the output current and the step-down transformer will increase the output current. A common tool for distributing and transmitting alternating current power, the transformer is essentially a voltage control device.
According to the question:
Vp/Vs = NP/NS
where V = voltage and N = no.of turns
P= primary S= secondary
so,VS = VP * NS/Np
VS = 120 *50/400 = 15V
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