u iv -w\i-\v.ii MI \|.>i 



ton | tie curve -.)' />' in i! . there is n< current in I. 



and />' i- dning all tin* work, I: is a )x>int <*u the 



combined torque curve. Join r and produce it. Tin* line 

 will give the < < ond>iiu*d torque f<r any current. from or 

 into the line. 



The curve of combined torque .-.it- the sjK-ed . 

 at a point , below the origin, indicatini: that when the 

 current from the line is n.-ihinir. u small negative tr|iui has 

 tobe Hupj)li'-<l to assist the motor :ind maintain the mi rent 

 in the two dynamos. Sincv the current in each dynamo i- 



. / / - V . 



here the same, we can u = |L * , where 



/i /i t 



are the two resistance*, an<i W . \l the two induc- 

 tion fat-tors. A' the tension of the line, and /- the speed in 

 revolutitms per second. Solving this e<|nation. we have 

 for the speed when the current from the line i- nothing 





rtintf the given value* for It and M, we find thnt 



the speed ar in this case is 1, 152 revolutions per minute. 



/ 



If n ' . Hence two coupled 



} ("., -f / i 



motor* with equal resistances and unequal ituluction 

 mctom behave at a Mingle motor with an iml 

 factor eijnal to the mean of thi* two in<ln<-tion factors. 



Knowini/ the speed, AP, we can find the induced 

 tension in each dynamo. Using the equation = M 

 see that the induced tension of I i- I t *> .' voltK, an<l 

 is 96*8 rolto The induced tension <( .1. now noting at a 

 generator, ii mnsiderahly uT'iiter than that of the lino. 

 whir ; while the ind n\v 



