If a shunt motor running with a load has its...

Question 1 / 270703AqY1wxmAqmlJgqb7Esd

Question 1 of 270703AqY1wxmAqmlJgqb7Esd

If a shunt motor running with a load has its shunt field opened, how would this affect the speed of the motor?

Question 1 of 27070

If a shunt motor running with a load has its shunt field opened, how would this affect the speed of the motor?

🔍 Key Concepts

• Behavior of a DC shunt motor when the field circuit is weakened or lost • Relationship between field flux and motor speed at a given load • How back EMF and armature current change if the field is opened

💭 Think About

• In a shunt motor, if the field winding suddenly loses current, what happens to the magnetic field strength and, in turn, the speed needed to balance the applied voltage? • Think about whether a weaker field makes it easier or harder for the motor to turn under the same load. • Would opening the shunt field more likely make the motor slow down, lock up, or try to change speed drastically to maintain the electrical balance?

✅ Before You Answer

• Recall that for a DC motor, speed is roughly inversely proportional to field flux when voltage and load are fixed. • Consider whether losing field current makes the flux very small or very large. • Verify which option matches the typical warning about DC shunt motors operating with a lost or open field.

Question 1 of 27070

If a shunt motor running with a load has its shunt field opened, how would this affect the speed of the motor?

It will slow down.

It will stop suddenly.

It will speed up.

It will be unaffected.