Question 1 of 27070
Q
Which of the conditions listed will indicate the need to clean the insulation on the windings of an electric motor?
A
Excessive vibration at normal speed.
B
Sparking at the brushes.
C
Higher than normal operating temperature.
D
High megger readings.
Question 1 / 270705eccefa4bacbc34ba4d483f8
Question 1 of 270705eccefa4bacbc34ba4d483f8

Which of the conditions listed will indicate the need to clean the insulation on the windings of an electric motor?

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Question 1 of 27070
Q

Which of the conditions listed will indicate the need to clean the insulation on the windings of an electric motor?

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🔍 Key Concepts

• Insulation condition vs. temperature in electric motors • What a megger (megohmmeter) reading actually tells you about insulation • Common symptoms of dirty vs. damaged components: brushes, bearings, windings

💭 Think About

• Which symptom is most directly related to the heat created by poor insulation on the windings? • Does high insulation resistance (shown by a megger) mean insulation is dirty or in good condition? • Which options could be caused by other mechanical issues (like imbalance or worn bearings) rather than dirty winding insulation?

✅ Before You Answer

• Be clear on what a high megger reading means: high resistance (good) vs. low resistance (bad). • Identify which choice points to a problem that would increase current and cause overheating in the windings. • Eliminate options that are more clearly tied to mechanical problems (vibration) or brush/commutator issues, not winding insulation.