Question 1: The reading of a dynamometer - type wattmeter with pressure coil phase angle of 2o is 700 watts, when it is used to measure power of a single phase inductive load supplied by 240 V single phase ac. source when the wattmeter is replaced by a second wattmeter with a phase angle of 1o for the pressure coil circuit, a reading of 620 watts is obtained. Assuming all errors of the wattmeter, except those due to pressure coil inductance are neglected. The actual power is _________ (in W).
Question 2: A 50 Hz generator is delivering 50% of the power that it is capable of delivering through a transmission line to an infinite bus. A fault occurs that increase the reactance between the generator and the infinite bus to 400% of the value before the fault. When the fault is isolated, the maximum power that can be delivered is 60% of the original maximum value. The critical clearing angle for the condition described is ________ (in degrees).
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