When a shunt wound DC motor is operating at...

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Question 1 of 205eccefa3bacbc34ba4d48065

When a shunt wound DC motor is operating at or near rated speed, what is the amount of mechanical power developed by the motor dependent upon? The mechanical load on the motor The current drawn by the armature

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🔍 Key Concepts

• Shunt-wound DC motor characteristics – how speed and flux behave near rated speed • Relationship between mechanical output power, torque, and speed • How armature current relates to torque in a shunt motor

💭 Think About

• Think about which variable directly determines the motor’s torque at nearly constant speed and field strength. • Ask yourself: in a shunt motor near rated speed, does mechanical load change armature current, or does armature current control the torque that can handle the load? • Consider whether the motor’s developed mechanical power is more fundamentally tied to electrical input (armature current) or to the external mechanical load, when speed is held near constant.

✅ Before You Answer

• Recall that mechanical power developed is approximately P_mech ≈ T × ω (torque × angular speed) at the shaft. • In a shunt DC motor with nearly constant field, check how torque is proportional to armature current (I_a). • Decide whether load is a cause or an effect in changing armature current and developed power when speed is held near rated.

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