5. Environmental Systems
Electrical Systems — Quiz
Test your understanding of electrical systems with 5 practice questions.
Practice Questions
Question 1
What role does the Coefficient of Utilization (CU) play in lighting design?
Question 2
In a room measuring 8\,m by 6\,m with a target illuminance of 500\,lux, using luminaires each providing 3000\,lumens, a CU of 0.6, and a light loss factor (LLF) of 0.8, how many luminaires are required? Show your calculation.
Question 3
A branch circuit with a round‐trip conductor length of 50\,m carries 20\,A. The conductor has a resistance of 0.00475\,Ω/m. Calculate the voltage drop and determine if it meets the 3\% maximum for a 230\,V supply. Show your calculation.
Question 4
What distinguishes a busbar trunking system from traditional cable‐based distribution in building electrical installations?
Question 5
A balanced three‐phase load draws 30\,kW at 400\,V with a power factor of 0.85. What is the line current? Show your calculation.