A transformer having efficiency $90 \%$ is working on 200 V and 3 kw power supply. If the current in the…

A transformer having efficiency $90 \%$ is working on 200 V and 3 kw power supply. If the current in the secondary coil is 6 A , the voltage across the secondary coil and the current in the primary coil are respectively
  1. $300 \mathrm{~V}, 15 \mathrm{~A}$
  2. $450 \mathrm{~V}, 15 \mathrm{~A}$
  3. $450 \mathrm{~V}, 13 \cdot 5 \mathrm{~A}$
  4. $600 \mathrm{~V}, 15 \mathrm{~A}$

Solution

$\begin{aligned} & \text { Power output }=3 \times \frac{90}{100}=2.7 \mathrm{~kW} \\ & I_s=6 \mathrm{~A} \\ \therefore \quad & V_S=\frac{2.7 \times 10^3}{6}=450 \mathrm{~V} \text { and } I_p=\frac{3 \times 10^3}{200}=15 \mathrm{~A}\end{aligned}$

Asked in: MHT CET 2024 (03 May Shift 1)

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