Discussion
Working the same machine at 1.0 per unit power, the angle between the two field axes comes to nearest
Answer: A
Correct answer: 53 degrees
\[ 1.0 = 1.25\sin\delta \quad\Rightarrow\quad \sin\delta = 0.8 \quad\Rightarrow\quad \delta = 53^\circ. \] Eighty per cent of the pull-out power is being delivered at 53 degrees rather than at 72, because the relation is sinusoidal - and the synchronising stiffness has already fallen to \( \cos 53^\circ \), or 60 per cent of its maximum.
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