An open in the armature of a DC motor is...

An open in the armature of a DC motor is...

Question 1 of 270705eccefa4bacbc34ba4d4853b

An open in the armature of a DC motor is suspected, but is not found by visual inspection of the commutator. What would be the next step in troubleshooting this problem?

Question 1 of 27070

Q

An open in the armature of a DC motor is suspected, but is not found by visual inspection of the commutator. What would be the next step in troubleshooting this problem?

🔍 Key Concepts

• DC motor armature faults such as opens vs grounds vs insulation failures • Purpose and method of a bar-to-bar test on a commutator • Difference between visual inspection, insulation resistance tests, and ground tests

💭 Think About

• Ask yourself which test is specifically designed to locate an open in the armature winding rather than a ground or insulation breakdown • Consider the logical sequence: after you have already inspected the commutator visually, what is the next more precise electrical test that targets individual commutator segments? • Match each choice with the type of fault it is best suited to detect: open circuit, ground fault, or insulation resistance problem

✅ Before You Answer

• Be clear on what an open circuit fault is and how it behaves electrically compared with a ground fault • Verify which method checks between adjacent commutator bars rather than between winding and ground • Check which tests in the options are most specific to locating a broken/loose armature coil connection instead of general insulation testing