Transformer Quiz Practice Quiz | transformer

Q: What is the primary function of a transformer?

To change the voltage of an AC circuit — Transformers primarily alter voltage levels, stepping it up or down.

Q: In an ideal transformer, what is the relationship between the primary and secondary voltages and the number of turns?

Vp/Vs = Np/Ns — Voltage ratio is directly proportional to the turns ratio (Vp/Vs = Np/Ns).

Q: What is the core material commonly used in transformers to reduce core losses?

Laminated steel — Laminated steel minimizes eddy current and hysteresis losses.

Q: What type of loss is minimized by laminating the core?

Eddy current loss — Lamination reduces the circulation of eddy currents in the core.

Q: What is the equivalent circuit parameter representing the core losses in a transformer?

Shunt resistance — Core losses are modeled by a shunt resistance in the equivalent circuit.

Q: Which of the following is a disadvantage of using a transformer?

AC only operation — Transformers only work with AC power, not DC.

Q: What determines the voltage regulation of a transformer?

Impedance and load — Voltage regulation depends on internal impedance and load.

Q: What is the purpose of the oil in an oil-filled transformer?

To provide insulation and cooling — Transformer oil insulates and dissipates heat effectively.

Q: In a step-down transformer, the number of turns in the secondary coil is ______ than in the primary coil.

less — Step-down transformers have fewer turns in the secondary (Vs < Vp).

Q: What is the efficiency of an ideal transformer?

100% — An ideal transformer has no losses, hence 100% efficiency.

Question 1 of 10

What is the primary function of a transformer?

Transformers primarily alter voltage levels, stepping it up or down.

Question 2 of 10

In an ideal transformer, what is the relationship between the primary and secondary voltages and the number of turns?

Voltage ratio is directly proportional to the turns ratio (Vp/Vs = Np/Ns).

Question 3 of 10

What is the core material commonly used in transformers to reduce core losses?

Laminated steel minimizes eddy current and hysteresis losses.

Question 4 of 10

What type of loss is minimized by laminating the core?

Lamination reduces the circulation of eddy currents in the core.

Question 5 of 10

What is the equivalent circuit parameter representing the core losses in a transformer?

Core losses are modeled by a shunt resistance in the equivalent circuit.

Question 6 of 10

Which of the following is a disadvantage of using a transformer?

Transformers only work with AC power, not DC.

Question 7 of 10

What determines the voltage regulation of a transformer?

Voltage regulation depends on internal impedance and load.

Question 8 of 10

What is the purpose of the oil in an oil-filled transformer?

Transformer oil insulates and dissipates heat effectively.

Question 9 of 10

In a step-down transformer, the number of turns in the secondary coil is ______ than in the primary coil.

Step-down transformers have fewer turns in the secondary (Vs < Vp).

Question 10 of 10

What is the efficiency of an ideal transformer?

An ideal transformer has no losses, hence 100% efficiency.

Transformer Quiz