Free BOC Electrical Systems and Lighting Questions and Answers — Questions and Answers
Question 1: What is the function of a circuit breaker in an electrical system?
- Increase voltage
- Measure electricity usage
- Protect against overcurrent (Correct answer)
- Balance electrical loads
Correct answer: Protect against overcurrent
A circuit breaker protects an electrical circuit from damage caused by overcurrent or short circuit by interrupting the flow of electricity.
Question 2: Which type of lighting is most energy-efficient for commercial buildings?
- Incandescent
- Fluorescent
- Halogen
- LED (Correct answer)
Correct answer: LED
LED lighting uses significantly less energy than traditional lighting sources and has a longer lifespan, making it ideal for commercial use.
Question 3: What device measures the amount of electrical energy consumed?
- Transformer
- Circuit breaker
- Electric meter (Correct answer)
- Switchgear
Correct answer: Electric meter
An electric meter tracks the amount of electrical energy used over time, typically in kilowatt-hours (kWh).
Question 4: What is the purpose of using motion sensors in lighting systems?
- Increase brightness during peak hours
- Control HVAC systems
- Reduce energy by turning off unused lights (Correct answer)
- Prevent electrical surges
Correct answer: Reduce energy by turning off unused lights
Motion sensors help save energy by automatically turning lights on when movement is detected and off when the space is unoccupied.
Question 5: Which term refers to the rate at which electrical energy is used?
- Voltage
- Resistance
- Current
- Power (Correct answer)
Correct answer: Power
Power is the rate at which energy is consumed, measured in watts or kilowatts.
Question 6: Why is it important to balance electrical loads in a facility?
- To double the amperage
- To ensure uneven energy supply
- To prevent overloads and increase efficiency (Correct answer)
- To decrease voltage
Correct answer: To prevent overloads and increase efficiency
Balancing loads prevents circuit overloads, reduces energy waste, and improves safety and equipment lifespan.
Free BOC Electrical Systems and Lighting Questions and Answers
What is the function of a circuit breaker in an electrical system?