10 PROBLEMS IN ALTERNATING CURRENT MACHINERY 



TRANSFORMER DATA. 



45. l (a) How many turns should there be in the high- and 

 low-tension windings in order that the maximum flux density 

 shall be 69,000 lines per square inch in transformer No. A? What 

 is the core loss? What is the ratio of the no-load current to the 

 full-load current? Use the magnetic data given in problem 10. 

 (b) How many turns should there be in the high- and low-tension 

 windings in order that the maximum flux density shall be 69,000 

 lines per square inch in transformer No. C? What is the core loss? 

 What is the ratio of the no-load current to the full-load current? 

 Use the magnetic data given in problem 10. (c) How many 

 turns should there be in the high- and low-tension windings in 

 order that the maximum flux density shall be 69,000 lines per 

 square inch in transformer No. E? What is the core loss? What 

 is the ratio of the no-load current to the full-load current? Use 

 the magnetic data given in problem 10. 



46. 1 (a) What are the no-load current and core loss in trans- 

 former No. B? Use the magnetic data given in problem 10. (b) 

 What are the no-load current and core loss in transformer No. D? 

 Use the magnetic data given in problem 10. (c) What are the 

 no-load current and core loss in transformer No. F.? Use the 

 magnetic data given in problem 10. 



TRANSFORMER DATA 



47. 1 (a) What are the maximum flux density, the permeability, 

 and the iron loss in watts per cubic inch for transformer No. G? 

 (b) What are the maximum flux density, the permeability, and 



1 Assume that at this flux density 75 additional ampere turns are required 

 because of the joints in the magnetic circuit. 



