If a three-phase induction motor...

Question 1 / 270705eccefa4bacbc34ba4d48213

Question 1 of 270705eccefa4bacbc34ba4d48213

If a three-phase induction motor malfunctions and drops to a single-phase (one supply line open), what would be the result?

Back

Question 1 of 27070

If a three-phase induction motor malfunctions and drops to a single-phase (one supply line open), what would be the result?

🔍 Key Concepts

• Three-phase induction motor operation and how torque is produced by a rotating magnetic field • What happens to the rotating magnetic field if one phase (line) is lost • Difference between starting a motor and keeping it running when one phase is missing

💭 Think About

• Think about whether the rotor can still see a rotating magnetic field with only one phase, or if it effectively becomes a single-phase motor with a very weak or pulsating field • Consider whether a motor that was already running on three phases behaves differently from a motor that is trying to start on only one phase • Ask yourself what effect loss of one phase has on torque and heating of the windings

✅ Before You Answer

• Verify what happens to a running three‑phase motor when it suddenly becomes single‑phased (one line opens) • Check whether a three‑phase induction motor can self-start on only one phase • Consider the relationship between load level and the motor’s ability to keep turning when one phase is lost

Question 1 of 27070

If a three-phase induction motor malfunctions and drops to a single-phase (one supply line open), what would be the result?

the motor will continue to run if it is not heavily loaded

more torque will be developed

the motor will immediately stop and not be able to be restarted

the motor will immediately stop and can only be restarted at no load

Question 1 / 270705eccefa4bacbc34ba4d48213

Question 1 of 270705eccefa4bacbc34ba4d48213

If a three-phase induction motor malfunctions and drops to a single-phase (one supply line open), what would be the result?

Back

Question 1 of 27070

If a three-phase induction motor malfunctions and drops to a single-phase (one supply line open), what would be the result?