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The torque-speed characteristics of motor $(TM)$ and load $(TL)$ for two cases are shown in the figures $(a)$ and $(b)$. The load torque is equal to motor torque at points $P$, $Q$, $R$ and $S$

The stable operating points are

  1. $P$ and $R$
  2. $P$ and $S$
  3. $Q$ and $R$
  4. $Q$ and $S$
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