Quiz on Transformers in Power Transmission

What is the primary advantage of AC power over DC power for electricity transmission?

• AC power can utilize transformers to reduce power loss

• AC power is more reliable

• AC power is easier to generate

• AC power is cheaper

Answer explanation

AC power can utilize transformers to reduce power loss, making it the primary advantage over DC power for electricity transmission.

What do transformers primarily do to improve the efficiency of power transmission?

• Increase the current

• Decrease the voltage

• Convert AC to DC

• Step up the voltage and reduce the current

Answer explanation

Transformers primarily step up the voltage and reduce the current to improve the efficiency of power transmission.

Why is high voltage preferred in transmission lines?

• It reduces the voltage drop and power loss

• It requires simpler infrastructure

• It is safer

• It is easier to generate

Answer explanation

High voltage is preferred in transmission lines because it reduces the voltage drop and power loss.

What is the relationship between power loss and current in transmission lines?

• Directly proportional to the voltage

• Proportional to the square of the current

• Inversely proportional to the voltage

• Inversely proportional to the current

Answer explanation

Power loss in transmission lines is proportional to the square of the current flowing through them, according to the relationship P = I^2 * R.

What is the function of a step-up transformer in a power transmission system?

• Increases the resistance in the circuit

• Decreases the overall power transmitted

• Converts low current/high voltage to high current/low voltage

• Converts high current/low voltage to low current/high voltage

Answer explanation

The function of a step-up transformer in a power transmission system is to convert high current/low voltage to low current/high voltage.

What is the function of a step-down transformer in a power transmission system?

• Increases the resistance in the circuit

• Decreases the overall power transmitted

• Converts high current/low voltage to low current/high voltage

• Converts low current/high voltage to high current/low voltage

Answer explanation

Converts low current/high voltage to high current/low voltage

Why are lower voltages preferred for domestic power?

• They require less maintenance

• They are easier to generate

• They are safer

• They are more efficient

Answer explanation

Lower voltages are preferred for domestic power because they are safer, reducing the risk of electrical accidents and damage to appliances.

What does the equation 'P = VI' represent?

• Transformer efficiency equation

• Electrical power equation

• Voltage drop equation

• Power loss equation

Answer explanation

The equation 'P = VI' represents the Electrical power equation.