An alternator operating at an efficiency of 98% has a full-load capacity of 25,000 kw. How much air expressed to the nearest thousand cfm, is required for ventilation

A generating station has a maximum demand of 30,000 kW. Calculate the cost per unit generated from the following data: Capital cost = P 130M; Annual load factor = 50%; Annual cost of fuel and oil = P7.5M ; Taxes, wages and salaries etc. = P7M and Interest and depreciation = 12%

A noninductive heater element with a resistance of 5 2 is connected across a 60 Hz source. The supply has a sine wave voltage with an instantaneous maximum value of 141.4 V. a. Determine the power in watts taken by the heater unit. b. What is the energy, in kilowatt-hours, taken by the heater unit in one month if it is operated 5 hours per day for a period of 20 days?

Two AC generators running in parallel supply the following loads: 400kW at unity pf; 500kW at 0.9 lagging pf; 600kW at 0.866 lagging pf. One machine is loaded to 1000kW at 0.92 lagging pf, what is the operating pf of the second machine? Ans. 0.951 lagging