What is the characteristic of a wound-rotor...

What is the characteristic of a wound-rotor...

Question 1 of 270705eccefa4bacbc34ba4d4820a

What is the characteristic of a wound-rotor induction motor, with a high resistance inserted in series with the rotor winding at startup?

Question 1 of 27070

Q

What is the characteristic of a wound-rotor induction motor, with a high resistance inserted in series with the rotor winding at startup?

🔍 Key Concepts

• Wound-rotor induction motor behavior when rotor resistance is increased • Relationship between rotor resistance, starting torque, and slip • How stator current is affected by improved power factor at start

💭 Think About

• When you add resistance in the rotor circuit, what happens to the torque-speed curve at standstill (startup)? • Does higher rotor resistance tend to improve or worsen the starting power factor, and how does that influence stator (line) current? • Compare this situation to a standard squirrel-cage motor’s typical starting torque and current.

✅ Before You Answer

• Be clear on how increasing rotor resistance affects starting torque in a wound-rotor motor, not during normal running but specifically at start • Think about whether an improved power factor at start leads to higher or lower stator current for a given torque • Eliminate any option where the torque/current behavior contradicts basic induction motor theory (e.g., high resistance usually means what kind of current draw?).