Question

A transformer contains $250$ and $150$ turns in its primary and secondary coils, respectively. The transformer is a ______.

(A) Step up transformer

(B) Step down transformer

• A. Only (A) is true.
• B. Only (B) is true.
• C. Both (A) and (B) are true.
• D. Both (A) and (B) are false.

Answer 1

The correct option is B

Only (B) is true.

Given data

$N_s=150$ and $N_p=250$

We know that $N_s$ and $N_p$is the number of turns in the secondary coil and primary coil respectively.

Finding the type of transformer

When $N_s>N_p$, the transformer is a step-up transformer.

When $N_s<N_p$, the transformer is a step-down transformer.

Here,$150<250$ i.e., $N_s<N_p$

So, it's a step-down transformer.

Hence, option B is correct Only (B) is true.