Electrical Machines The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is 60 Hz. 16.67 Hz. 25 Hz. 50 Hz. 60 Hz. 16.67 Hz. 25 Hz. 50 Hz. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents? primary = 22.7 A, secondary = 602.4 A primary = 11.4 A, secondary = 301 A primary = 602 A, secondary = 22.7 A primary = 301 A, secondary = 22.7 A primary = 22.7 A, secondary = 602.4 A primary = 11.4 A, secondary = 301 A primary = 602 A, secondary = 22.7 A primary = 301 A, secondary = 22.7 A ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The volt-ampere euation for a long-shunt compound motor is given by Vt = Ea + Ia(ra + rs) Vt= Ea + Iara Vt= Ea– Iara Vt = Ea + Iara+ ILrs Vt = Ea + Ia(ra + rs) Vt= Ea + Iara Vt= Ea– Iara Vt = Ea + Iara+ ILrs ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Stray losses in transformer occurs in winding conductors and steel structures of transformer. transformer insulating oil. paper insulation in transformers. steel core. winding conductors and steel structures of transformer. transformer insulating oil. paper insulation in transformers. steel core. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to infinity. unity. zero. two. infinity. unity. zero. two. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator? same phase sequence same frequency same prime mover speed same voltage magnitude same phase sequence same frequency same prime mover speed same voltage magnitude ANSWER DOWNLOAD EXAMIANS APP
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