Understanding Electrical Systems and Components

Which of the following best describes the purpose of a circuit breaker in an electrical system?

• To increase the voltage in a circuit

• To automatically interrupt the flow of current in case of overload or fault

• To convert AC to DC

• To measure the resistance in a circuit

According to the IET Wiring Regulations (BS 7671), what is the minimum recommended height for mounting a standard wall socket in a domestic dwelling?

• 100 mm above floor level

• 450 mm above floor level

• 1 metre above floor level

• 2 metres above floor level

Which of the following is a fundamental principle in circuit design to ensure safety and reliability?

• Using the thinnest wires possible to save cost

• Ensuring all connections are soldered, regardless of environment

• Matching the current rating of components to the expected load

• Placing all components as close together as possible

In a simple control system, what is the main function of a feedback loop?

• To supply power to the system

• To monitor and adjust the system output based on actual performance

• To increase the system’s speed

• To reduce the system’s cost

Which of the following is a key advantage of integrating solar photovoltaic (PV) panels into the national grid?

• They require no maintenance

• They provide a renewable source of energy, reducing reliance on fossil fuels

• They generate electricity at night

• They are unaffected by weather conditions

Which British Standard covers the requirements for electrical safety in low-voltage installations?

• BS 1363

• BS 7671

• BS 3036

• BS 6004

What is the main function of a relay in an electrical control system?

• To store electrical energy

• To amplify signals

• To switch a circuit on or off using a low-power signal

• To convert AC to DC

Which of the following is NOT a typical challenge when integrating wind energy into the electrical grid?

• Variability of wind speed

• Noise pollution

• Consistent, predictable output

• Grid stability issues