If a motor is direct-on-line started with...

Study

Question 1 of 205eccefa4bacbc34ba4d483ac

If a motor is direct-on-line started with the stator winding star connected, it will only take a fraction of the starting current that it would take if the windings were delta connected. What is that fraction?

Back

Question 1 of 20

5eccefa4bacbc34ba4d483ac

No comments yet

Be the first to share your thoughts!

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

🔍 Key Concepts

• Relationship between line voltage and phase voltage in star (Y) and delta (Δ) connections • How starting current depends on applied phase voltage in an induction motor • Relationship between line current and phase current in star vs delta

💭 Think About

• First, write the formulas that relate line voltage to phase voltage in both star and delta connections. How do they differ? • Assume the motor has the same impedance per phase. Express the line current for star and for delta in terms of line voltage and impedance, then form the ratio (star current)/(delta current). • Compare your ratio with the numerical value of each option. Which one matches your calculated fraction most closely?

✅ Before You Answer

• Be clear whether you are comparing line current to line current (star vs delta), not phase currents. • Use the standard three‑phase relationships: in star, line current = phase current; in delta, line current = √3 × phase current. • Verify that you simplify any √3 terms correctly before matching to the multiple‑choice options.

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed