1. ⇒ (MHT CET 2023 13th May Morning Shift )

A transformer has 20 turns in the primary and 100 turns in the secondary coil. An ac voltage of $V_{in} = 600 \sin 314 t$ is applied to primary terminal of transformer. Then maximum value of secondary output voltage obtained in volt is

A. 600

B. 300

C. 3000

D. 6000

Correct Option is (C)

We know,

$\frac{V_{s}}{V_{p}} = \frac{N_{s}}{N_{p}}$

$∴$ The maximum value of secondary output voltage is:

$\begin{aligned} V_{s} & = \frac{N_{s}}{N_{p}} \times V_{p} = \frac{100}{20} \times 600 \\ V_{s} & = 3000 V \end{aligned}$

2. ⇒ (MHT CET 2021 21th September Evening Shift )

In a step up transformer, which one of the following statements is correct?

A. Number of turns in the secondary coil is less than in primary coil.

B. Voltage in secondary coil is less than voltage is primary coil.

C. Current in the primary coil is more than current in the secondary coil.

D. Current in the primary coil is equal to current in the secondary coil.

Correct Option is (C)

In a step up transformer, the current in the secondary is less than the current in the primary.

3. ⇒ (MHT CET 2021 20th September Evening Shift )

In an ideal step down transformer, out of the following quantities, which quantity increases in the secondary coil?

A. Power

B. Voltage

C. Current

D. Frequency

Correct Option is (C)

For an ideal transformer,

$\frac{V_{s}}{V_{p}} = \frac{I_{p}}{I_{s}}$

Hence, if $V_{s} < V_{p}$ then $I_{p} < I_{s}$

⇒ Electromagnetic Induction