Which is NOT a task to carry out during a rotating machines maintenance.?

Question

BlackTom AI · Accepted Answer

Routine maintenance for rotating machines primarily involves mechanical servicing and electrical checks: lubrication of bearings, inspection and replacement of brushes, visual inspection for wear and damage, cleaning ventilation paths and bodywork, and electrical tests of field and armature coils. These activities are hands-on corrective or preventive actions performed during maintenance intervals.

Relevant knowledge points and concepts:
- Preventive maintenance: scheduled mechanical and electrical tasks to keep a machine operating reliably (lubrication, cleaning, brush checks).
- Corrective/diagnostic testing: targeted electrical tests of windings (insulation resistance, continuity) to detect faults.
- Condition monitoring: continuous or periodic measurements (temperature, vibration, oil analysis) used to track machine health rather than perform direct service.

Step-by-step reasoning:
1. Lubrication of bearings: Bearings require regular lubrication to reduce friction and wear. This is a standard maintenance task.
2. Check of brushes: For machines with brushes (e.g., DC machines, slip-ring motors), brush condition and seating are inspected and adjusted/replaced during maintenance.
3. Visual inspection: Looking for loose bolts, corrosion, insulation damage, leaks or debris is a basic maintenance step.
4. General cleaning of vents and body: Ensures cooling passages are clear; directly affects machine cooling and is a routine maintenance action.
5. Testing of field and armature coils: Electrical tests (continuity, insulation resistance, short-circuit tests) are performed during maintenance to verify winding integrity.
6. Temperature test: Measuring temperature (thermocouples, infrared) is primarily a condition-monitoring or diagnostic activity performed during operation or via separate inspections; it is not typically a direct maintenance action like lubrication or cleaning.

Why the correct answer is correct:
Temperature testing is a monitoring/diagnostic measure used to assess machine condition (often online or during testing), not a hands-on maintenance task performed to service or restore components. The other options are direct maintenance tasks.

Why other options are incorrect:
Each of the other listed items (lubrication, brush checks, visual inspection, cleaning vents, coil testing) are standard maintenance procedures undertaken during scheduled servicing.

Conclusion: Therefore, "Temperature test" is NOT a typical maintenance task to carry out during rotating machines maintenance, matching the provided answer.

Which is NOT a task to carry out during a rotating machines maintenance.?单项选择题

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