:A self-excited shunt generator fails to build up, because The field circuit is open .1 The armature circuit is open .2 The residual magnetic is absent.3 The direction of rotation is wrong .4 From these option, the correct answer is and 3,2,1 .AO and 3,1.B O and 4,3,2,1.CO only 3.D O

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Winding and Constructions

Alternating Current (AC) winding is generally of the 3-phase type due to the inherent advantages of the 3-phase machine. Armature coils must be connected to the yield balance (equivalent in magnitude and 2/3 of the series phase difference of the rod) 3-phase electromotive forces (emf). The armature should be divided into step-bands to start with slots around the perimeter.In the construction of AC machines, the frame is used as an external protective shield to protect it from environmental conditions. The frame also serves as the outer perimeter, allowing the interior to be easily placed. The static state section of the devices is the stator winding attached stator.