What is the most effective method of...

Question 1 / 270705eccefa3bacbc34ba4d480a3

Question 1 of 270705eccefa3bacbc34ba4d480a3

What is the most effective method of locating a loose commutator bar in a D.C. motor?

Question 1 of 27070

What is the most effective method of locating a loose commutator bar in a D.C. motor?

🔍 Key Concepts

• Function of a commutator in a D.C. motor and what happens when a bar is loose • How vibration, sound, and movement can indicate looseness in mechanical/electrical parts • Practical methods used by marine electricians to find defects without disassembling equipment

💭 Think About

• Think about which method would most clearly show a difference between a tight, secure bar and a loose bar while the motor is at rest and safe to work on • Consider which option provides a clear, repeatable indication (such as a difference in feel or sound) rather than relying only on sight or excessive force • Ask yourself which method is commonly used in practice to find loose parts in electrical machines like motors and generators

✅ Before You Answer

• Verify which choice allows you to compare each bar against its neighbors in a simple, quick way • Check which method avoids applying excessive mechanical stress to the commutator surface or bars • Think about which technique would make a loose bar stand out clearly by producing a different feedback (such as a distinct response) compared to properly secured bars

Question 1 of 27070

What is the most effective method of locating a loose commutator bar in a D.C. motor?

visual inspection

jiggling each by hand

sounding each bar with a light weight hammer

checking with a calibrated torque wrench

Question 1 / 270705eccefa3bacbc34ba4d480a3

Question 1 of 270705eccefa3bacbc34ba4d480a3

What is the most effective method of locating a loose commutator bar in a D.C. motor?

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Question 1 of 27070

What is the most effective method of locating a loose commutator bar in a D.C. motor?