1. Describe the definition and function of the following devices: (a) Miniature Circuit Breaker (MCB) (b) Earth Leakage Circuit Breaker (ELCB) 2. Your office is fitted with five units of 30W Compact Fluorescent Lamp (CFL) and two units of 1.5HP air conditioning unit. At the air conditioning unit’s nameplate data, the power factor is 0.7, and for CFL is 1.0. (Notes: 1HP = 746 Watt; HP is horsepower unit) (a) What is the total real power of your office in kW? (b) What is the total reactive power of your office in kVAR? (c) What is the total apparent power of your office in kVA? (d) What is the total power factor in your office? (e) What is the capacity of the reactive power that you intend to install?
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