In the comparison statement, which motor is the baseline to which the PSC motor is compared?

In the comparison statement, which motor is the baseline to which the PSC motor is compared?

• A. Shaded pole motor
• B. CSR
• C. Three-phase motor
• D. PSC motor

Answer: (A)

The main idea here is understanding what serves as the reference point when comparing motor types. In single‑phase induction motor comparisons, the simplest, oldest design—without a separate start winding—is used as the baseline. That’s the shaded pole motor. The permanent-split capacitor (PSC) motor is then evaluated against this baseline to show how adding a permanent capacitor improves starting torque, running efficiency, and power factor. The other options aren’t the baseline because they either use a different supply method (three-phase motor) or are different single‑phase designs meant for comparison themselves (capacitor-start-run) or are the device under comparison (the PSC motor). So the shaded pole motor is the correct baseline.

The main idea here is understanding what serves as the reference point when comparing motor types. In single‑phase induction motor comparisons, the simplest, oldest design—without a separate start winding—is used as the baseline. That’s the shaded pole motor. The permanent-split capacitor (PSC) motor is then evaluated against this baseline to show how adding a permanent capacitor improves starting torque, running efficiency, and power factor. The other options aren’t the baseline because they either use a different supply method (three-phase motor) or are different single‑phase designs meant for comparison themselves (capacitor-start-run) or are the device under comparison (the PSC motor). So the shaded pole motor is the correct baseline.