Transformer | MCQs

Explanation

The output voltage of transformer is greater than input voltage.

then it is known as step up transformer.

Explanation

A step-up transformer increases the voltage of the input signal, resulting in a higher voltage output.

This is achieved by having more turns in the secondary coil than in the primary coil.

Explanation

The turns ratio of a transformer is given by:

n = N₂ / N₁ = V₂ / V₁

Where:

- n is the turns ratio

- N₁ and N₂ are the number of turns in the primary and secondary coils

- V₁ and V₂ are the primary and secondary voltages

Given n = 5:

V₂ / V₁ = 5

This means the secondary voltage is greater than the primary voltage by a factor of 5.

Explanation

Explanation

A transformer can either convert high AC to low AC voltages or low AC to high AC voltages.

It functions through electromagnetic induction, adjusting voltage levels without changing from AC to DC.

Explanation

A turn ratio of 10 means that the secondary coil (Ns) has 10 times more turns than the primary coil (Np).

This is a step-up transformer, which increases the voltage and decreases the current.

Explanation

In a step-up transformer, the quantity that remains constant is power. 

Power conservation:

In an ideal transformer, the power input to the primary coil is equal to the power output from the secondary coil, meaning power is conserved. 

Voltage and current change:

While power stays constant, the voltage increases in a step-up transformer, which results in a corresponding decrease in current to maintain the same power output. 

Explanation

A transformer operates on the principles of “electromagnetic induction”, in the form of Mutual Induction.

Mutual induction is the process by which a coil of wire magnetically induces a voltage into another coil located in close proximity to it.

Explanation

Transformer works on Faraday's law of mutual induction.

Faraday's law of electromagnetic induction states that,

"When a change takes place in the magnetic flux which is linked with a circuit, an electromotive force current will induce in the circuit"

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Transformers are used to change AC voltage levels

The transformer work only on an AC supply

Explanation

Soft iron is most suitable for transformer cores due to its high magnetic permeability and low hysteresis loss.

It allows efficient magnetic flux linkage, improving transformer performance.