If a DC motor runs faster than designed,...

Question 1 / 205eccefa3bacbc34ba4d4806d

Question 1 of 205eccefa3bacbc34ba4d4806d

If a DC motor runs faster than designed, with all other conditions being normal, what could be the possible cause?

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Question 1 of 20

5eccefa3bacbc34ba4d4806d

If a DC motor runs faster than designed, with all other conditions being normal, what could be the possible cause?

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🔍 Key Concepts

• Speed-torque characteristics of DC motors • Effect of field strength on motor speed in a shunt-wound DC motor • What happens to speed under overload vs. loss of field

💭 Think About

• Think about whether reducing magnetic field strength tends to make a DC motor speed up or slow down for the same voltage. • Consider what typically happens to a DC motor’s speed if it is mechanically overloaded. • Ask yourself which of the listed faults would still allow the motor to run, but at an abnormally high speed.

✅ Before You Answer

• Verify which fault would cause a weak or missing field while leaving armature voltage applied. • Check which faults would more likely cause loss of torque or no rotation at all, rather than overspeed. • Confirm which condition is commonly associated with dangerous overspeed in DC shunt motors.

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Question 1 of 20

If a DC motor runs faster than designed, with all other conditions being normal, what could be the possible cause?

open shunt field coil

open armature coil

reversed commutating pole

overload

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