Within the split phase family of single...

Question 1 / 2066636eed28f7522a1c51dd7c

Question 1 of 2066636eed28f7522a1c51dd7c

Within the split phase family of single phase motors, what are the operational characteristics of the motor shown in figure "B" of the illustration? Illustration EL-0207

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Question 1 of 20

66636eed28f7522a1c51dd7c

Within the split phase family of single phase motors, what are the operational characteristics of the motor shown in figure "B" of the illustration? Illustration EL-0207

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🔍 Key Concepts

• Figure B shows an auxiliary (start) winding in series with a start capacitor and a centrifugal switch – this is the classic capacitor-start split-phase motor configuration. • Compare the typical starting torque and running efficiency of these types in the split‑phase family: resistance‑start (no capacitor), capacitor‑start (start capacitor only), permanent‑split capacitor (run capacitor only), and capacitor‑start/capacitor‑run (both). • Think about what a start capacitor is optimized for (starting performance) versus what a run capacitor is optimized for (running performance/efficiency).

💭 Think About

• How does adding a start capacitor in series with the auxiliary winding affect the phase angle between currents in the main and auxiliary windings, and what does that do to starting torque? • Once the motor is up to speed and the centrifugal switch opens, is any capacitor left in the circuit to improve running power factor and efficiency? • Which option best matches a motor that is designed mainly to improve starting performance but reverts to a standard induction‑run condition after startup?

✅ Before You Answer

• Confirm in the diagram that the capacitor in figure B is labeled Start Capacitor and is removed from the circuit by the centrifugal switch during normal running. • Verify whether there is any run capacitor left in the circuit in figure B once the motor reaches speed – this directly affects running efficiency. • Match that configuration to the known characteristics of a capacitor‑start, induction‑run split-phase motor: focus separately on starting torque and running efficiency.

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Question 1 of 20

Within the split phase family of single phase motors, what are the operational characteristics of the motor shown in figure "B" of the illustration? Illustration EL-0207

Relatively low starting torque and relatively high running efficiency

Relatively low starting torque and relatively low running efficiency

Relatively high starting torque and relatively low running efficiency

Relatively high starting torque and relatively high running efficiency

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Question 1 / 2066636eed28f7522a1c51dd7c

Question 1 of 2066636eed28f7522a1c51dd7c

Within the split phase family of single phase motors, what are the operational characteristics of the motor shown in figure "B" of the illustration? Illustration EL-0207

Back

Question 1 of 20

66636eed28f7522a1c51dd7c

Within the split phase family of single phase motors, what are the operational characteristics of the motor shown in figure "B" of the illustration? Illustration EL-0207

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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