92 PROBLEMS IN ALTERNATING CURRENT MACHINERY 



on a 6400-volt, 25-cycle circuit in parallel with synchronous 

 apparatus. What are the output, the power factor, and the 

 efficiency when the slip is 1.9 per cent, and the voltage gener- 

 ated in the stator winding by the air-gap flux is (assumed to be) 

 92 per cent, of the terminal voltage? Assume that the ratio of 

 the effective to the ohmic resistance for the rotor is 20 per cent, 

 greater than for the stator, and that the ratios of the leakage 

 reactances and of the effective resistances are equal at the rated 

 frequency and a temperature of 25 C. The running temperature 

 is 70 C. 



