1. Discuss the features of two-wattmeter method of power measurement. 2. What is the significance of equal readings on the two watt meters in the two-wattmeter method? 3. In the two-wattmeter method, one of the watt meters reads zero. What would be the load power factor?

Maximum power capacity 15 kVa, rated voltage 2300 (primary) / 230 (secondary) volts. The respective impedances of the primary and secondary sides are as follows: R1 = 2 ohms R2 = 0.0245 ohms Rc = 105 Kohm X1 = 3 ohms X2 = 0.0345 ohms Xm = 11 k ohms a. How big is R2 from the primary circuit? b. What is the maximum current on the primary side? c. At maximum current on the primary side, what is the power loss in R1?

What is the current in amperes in a 3-phase circuit when the load is 135 horsepower, the efficiency is 90%, the voltage is 440 volts, and the circuit power factor is 0.80? Round the answer to the nearer hundredth.