A 4-pole star connected; three phase alternator has 6 slots per pole per phase in the stator. What is its slot angle in degree?

Correct option is D

​$$\text{The slot angle (electrical) of an alternator is given by:} \\[8pt]\text{Slot angle} = \frac{180^\circ}{\text{Number of slots per pole}} \\[12pt]\textbf{Given:} \\[6pt]\bullet \ \text{Slots per pole per phase} = 6 \\[4pt]\bullet \ \text{Number of phases} = 3 \\[10pt]\text{So, slots per pole:} \\[6pt]= 6 \times 3 = 18 \\[14pt]\textbf{Calculation:} \\[8pt]\text{Slot angle} = \frac{180^\circ}{18} = 10^\circ$$​​