(b) A balanced Y-connected load has phase voltage of 230 V and positive phase sequence. The impedances and Zc are 10230° N, respectively. I GUTM By taking VAB Oon the load side as a reference, determine all the line currents and asTM (ii) UT ciM I (i) Total real power of Q and total apparent power, UTM e loads can be measured using two wattmeter methods. Draw the connection of the two wattmeters if their current coils are in line A UT UT UT

Number 2 A piece of beef steak 7 cm thick will be frozen in the freezer room -30°C. This product has a moisture content of 73%, a density of 970 kg/m³, and a thermal conductivity (frozen) of 1.1 W/(m²K). Estimate the freezing time. using the Plank equation. This product has an initial freezing temperature of -1.75°C, and the movement of air in the freezing room gives a convective heat transfer coefficient of 15 W/(m²K). t f = answer in hour

a. Description of lamp-ballast system b. Choose the power rating of T8 fluorescent lamp to be used in the system c. The operation of lamp-ballast circuit d. The modelling of the lamp-ballast by an equivalent circuit e. The design of inductance of the choke of the lamp-ballast system f. Determine the supply current and power factor g. Decide the desire power factor to be achieved and state the reason for the chosen of that value of power factor h. The design of size of capacitor for power factor correction. i. Team members information