If an induction motor were to be operated at...

Question 1 / 270705eccefa4bacbc34ba4d48200

Question 1 of 270705eccefa4bacbc34ba4d48200

If an induction motor were to be operated at 90% rated voltage and at rated load, what would be the result?

Question 1 of 27070

If an induction motor were to be operated at 90% rated voltage and at rated load, what would be the result?

🔍 Key Concepts

• Induction motor torque vs voltage (torque ∝ V²) • Difference between synchronous speed and slip and what they depend on • How running current and heating change when voltage is reduced but load (kW) stays the same

💭 Think About

• If the supply voltage is reduced to 90% but the mechanical load (kW) is still rated, what must happen to the motor current to deliver the same power? • Does synchronous speed depend on voltage or on supply frequency and number of poles? What actually changes when voltage is reduced? • How does torque at a given slip change when voltage is reduced, and what does the motor do (in terms of slip and current) to try to maintain the same load torque?

✅ Before You Answer

• Confirm that starting torque is proportional to the square of voltage for an induction motor. • Verify what sets synchronous speed (frequency and poles vs voltage). • Think about whether lower voltage at same load tends to make current and copper losses (I²R) go up or down, and what that does to motor temperature.

Question 1 of 27070

If an induction motor were to be operated at 90% rated voltage and at rated load, what would be the result?

there would be an increase in starting torque

starting current would increase slightly

synchronous speed would decrease slightly

running current would increase and the motor would run hotter

Question 1 / 270705eccefa4bacbc34ba4d48200

Question 1 of 270705eccefa4bacbc34ba4d48200

If an induction motor were to be operated at 90% rated voltage and at rated load, what would be the result?

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Question 1 of 27070

If an induction motor were to be operated at 90% rated voltage and at rated load, what would be the result?