SYNCHRONOUS GENERA TORS 25 



If the coil pitch is 1.0, what is the generated armature voltage 

 per turn? What is the form factor of this e.m.f.? 



8. In problem 7 if the coil pitch is 0.8, what is the generated 

 armature voltage per turn? What is the form factor of this 



e.m.f.? 



9. In problem 7 if the coil pitch is 0.67, what is the generated 

 armature voltage per turn? What is the form factor of this 

 e.m.f. 



10. With normal excitation the resultant air-gap flux in a 

 ()()-( vcle alternator is 10 6 lines per pole. The equation of the 

 curve which represents the flux density in the air-gap is: 



B = Bi sinx+B 3 sin 3r. 



.r is the electrical angle measured from the point midway between 

 the poles. Take B 3 = 0.3#i. 



If the coil pitch is 1.0, what is the generated armature voltage 

 per turn? What is the form factor of this e.m.f.? 



11. In problem 10 if the coil pitch is 0.8, what is the generated 

 armature voltage per turn? What is the form factor of this 

 e.m.f.? 



12. In problem 10 if the coil pitch is 0.67 what is the generated 

 armature voltage per turn? What is the form factor of this 

 e.m.f.? 



13. With normal excitation the resultant air-gap flux in a 

 60-cycle alternator is 10 8 lines per pole. The equation of the 

 curve which represents the flux density in the air gap is: 



sn 



./ i> the electrical angle measured from the point midway l>ctwccn 

 the poles. Take 8 = 0.3#i. 



h' the coil piteh i- l.o. what i- t he genera ted armature voltage 

 irn'.' What i- the form factor of this r.n 



14. With normal excitation the re-ultant air-gup flux in a (ill- 

 cycle alternator i< K) 1 ' line^ p< T p,,],.. The equation of the curve 

 which represent- the flux density in the air-gap is: 



= i sn z, sn 



./ i- the electrical an^l' Bd frm t he point midway br- 



ibe poles. Take B, - 0.3^!. 



