The following stator-to-rotor air gap...

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Question 1 of 205eccefa4bacbc34ba4d484c8

The following stator-to-rotor air gap clearance readings were obtained from a horizontally mounted, bilge pump, induction motor, equipped with sleeve bearings: FWD END AFT END Top .045 .049 Right Side .045 .047 Left Side .045 .047 Bottom .045 .041 Which of the following statements is true?

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🔍 Key Concepts

• Air gap readings and bearing position on a horizontal motor (how clearance changes when a bearing is high vs low) • Difference between forward vs aft end readings, especially at the bottom • What it means when clearances are larger on one end and smaller on the opposite end in a sleeve-bearing motor

💭 Think About

• Compare the top vs bottom readings at both ends: which end shows the rotor closer to the stator at the bottom? • If the rotor is closer at the bottom on one end only, does that suggest the bearing at that end is too high or too low? • Which corrective action (raise or lower / add or remove shims / replace) would move the rotor toward a more even air gap all around?

✅ Before You Answer

• Verify which end (forward or aft) has the smallest air gap at the bottom compared to the top. • Check whether the pattern of readings suggests misalignment (tilt) rather than general wear (which might call for replacement). • Confirm whether the needed correction is to raise or lower the bearing on the end showing the greatest deviation from uniform clearance.

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