How may temporary repairs to an open DC...

Question 1 / 270705eccefa4bacbc34ba4d485c2

Question 1 of 270705eccefa4bacbc34ba4d485c2

How may temporary repairs to an open DC propulsion armature coil be made, allowing continued operation until permanent repairs can be made?

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Question 1 of 27070

How may temporary repairs to an open DC propulsion armature coil be made, allowing continued operation until permanent repairs can be made?

🔍 Key Concepts

• DC propulsion motor armature coils and how they connect to commutator bars • What happens if one armature coil is damaged or open-circuited in a DC motor • The purpose of insulation and short-circuiting commutator bars in temporary armature repairs

💭 Think About

• Which choice safely removes the faulty coil from normal current flow while keeping the armature mechanically intact and the motor able to run? • In a DC machine, what is the effect of directly grounding or directly connecting an open coil to brushes on sparking, heating, and further damage? • Which option best reduces arcing at the commutator while preventing the damaged coil from carrying current?

✅ Before You Answer

• Make sure you understand what it means to short circuit commutator bars vs. short circuit the coil itself • Check which options would increase sparking or risk of a ground fault, and eliminate those • Verify which method both insulates the coil ends and provides a low-resistance path around the damaged coil so the machine can still operate temporarily

Question 1 of 27070

How may temporary repairs to an open DC propulsion armature coil be made, allowing continued operation until permanent repairs can be made?

connecting the coil ends directly to a pair of negative brushes

disconnecting coil ends, insulating each, and short circuiting the two commutator bars

grounding the coil ends and short circuiting the commutator bar

removing the sparking brushes

Question 1 / 270705eccefa4bacbc34ba4d485c2

Question 1 of 270705eccefa4bacbc34ba4d485c2

How may temporary repairs to an open DC propulsion armature coil be made, allowing continued operation until permanent repairs can be made?

Back

Question 1 of 27070

How may temporary repairs to an open DC propulsion armature coil be made, allowing continued operation until permanent repairs can be made?