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The operating region of the developed torque $\left(T_{e m}\right)$ and speed $(\omega)$ of an induction motor drive is given by the shaded region $OQRE$ in the figure. The load torque $\left(T_{L}\right)$ characteristic is also shown. The motor drive moves from the initial operating point $O$ to the final operating point $S$. Which one of the following trajectories will take the shortest time?

  1. $O-Q-R-S$
  2. $O-P-S$
  3. $O-E-S$
  4. $O-F-S$

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