Question

For the given circuit, comment on the type of transformer used.

• A. Step down transformer
• B. Auxiliary transformer
• C. Step-up transformer
• D. Autotransformer

Answer 1

The correct option is C

Step-up transformer

Step 1. Given data:

Current in the secondary circuit,$i_s=0.11A$ and

Power in the secondary circuit is $P_s=60W$

Input voltage in the primary coil is $220V$

Step 2. Finding voltage in secondary coil:

The power is given by, $P_s=i_s\times V_s$

$\Rightarrow V_s=\frac{P_s}{i_s}=\frac{60}{0.11}$

$\Rightarrow V_s=545.45V$

The voltage in the secondary coil is greater than that in the primary coil, it indicates that the transformer is a step-up transformer.

Hence, option C is correct.