CSIR stands for Capacitor Start, Induction Run.

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Multiple Choice

CSIR stands for Capacitor Start, Induction Run.

Start with the idea that this name describes how a single‑phase induction motor uses a capacitor to help starting. In a Capacitor Start, Induction Run motor, a capacitor is put in series with the start winding to create a strong phase shift and high starting torque. Once the motor reaches speed, that start capacitor is disconnected, and the motor continues running with the induction of the run winding alone. This is why the “Capacitor Start” part fits the starting behavior, and “Induction Run” fits the running behavior. The other descriptions don’t match this pattern: a Capacitor Run motor keeps the capacitor in the circuit during running, which changes running performance; Induction Start would imply starting by induction rather than using a capacitor for starting torque; the odd phrasing Start-Run Capacitor Induction isn’t the standard designation for this configuration. So the conventional and accurate label is Capacitor Start, Induction Run.

Start with the idea that this name describes how a single‑phase induction motor uses a capacitor to help starting. In a Capacitor Start, Induction Run motor, a capacitor is put in series with the start winding to create a strong phase shift and high starting torque. Once the motor reaches speed, that start capacitor is disconnected, and the motor continues running with the induction of the run winding alone. This is why the “Capacitor Start” part fits the starting behavior, and “Induction Run” fits the running behavior.

The other descriptions don’t match this pattern: a Capacitor Run motor keeps the capacitor in the circuit during running, which changes running performance; Induction Start would imply starting by induction rather than using a capacitor for starting torque; the odd phrasing Start-Run Capacitor Induction isn’t the standard designation for this configuration. So the conventional and accurate label is Capacitor Start, Induction Run.

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