CPD PROGRAMME Module 41 June 2012 1. Which of these is unlikely to provide a significant reactive load?
A Incandescent lamp B Fluorescent lamp C Transformer D Digital equipment E Welding equipment
2. Looking at figure 2, what would happen to the value of the average power as the current lag increases towards 90°?
A Stays constant B Rises towards a maximum C Goes towards zero D Goes negative E Little change in value
3. A 10kW motor has a power factor of 0.90 (lagging). What is the approximate apparent power required by the motor?
A 1.11kVAr B 10 kVA C 10 kW D 0.90kVAr E 11.1kVA
4. If a 80W low energy lamp requires a reactive power of 90VAr, what is the approximate power factor?
A 0.16 B 0.33 C 0.50 D 0.66 E 0.88
5. Which of these is least likely to be a significant direct result of improving power quality in buildings?
A Reduce kW power costs B Reduce loads on distribution networks C Reduce potential for reactive power costs
D Reduce potentially damaging heating in transformer equipment
E Reduce instability in power systems 54 CIBSE Journal June 2012
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