Single phase portable generators are generally made in the range of :

8) An alternator supplies electric power to various kinds of loads of a factory. If the phase sequence of the alternator is changed, it will affect the :

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 :