9) The values of pitch factor and distribution factor for an alternator are 0.9 and 0.8 respectively. This will develop an e.m.f. lesser than an alternator having full-pitch coil and concentrated winding by :

10) The number of slip-rings used in a 3-phase, star connected alternator having a rotating armature will be :

11) The pitch factor is defined as the ratio of the e.m.fs. of the :

12) The rotor of a salient pole alternator has 12 poles. The number of cycles of e.m.f. in one revolution will be :\n(Hint: Two-pole alternator will generate one cycle of e.m.f. in one rotation)

13) In large sized alternators, dampers are used to :