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Maintenance & Mechanics Flashcards

7 cards from real USPS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Maintenance & Mechanics flashcards as text

  1. A technician records: 'Replaced broken drive sprocket on conveyor C-7. Old sprocket: 18-tooth, 1-inch pitch. New sprocket installed: 24-tooth, 1-inch pitch.' If the original design requires an 18-tooth sprocket, what problem does this change create?

    Answer: The conveyor speed will increase and may exceed safe operating limits

    Installing a larger sprocket increases the driven speed, which can cause the conveyor to run faster than its rated safe speed.

  2. A safety data sheet (SDS) review log lists: 'Chemical: Battery acid (sulfuric acid). SDS last reviewed: March 2023. Next review required: March 2026.' Today is July 2026. What is the error in the log?

    Answer: The next review date has passed and the SDS is overdue for review

    The SDS review was due in March 2026 and it is now July 2026, making the review three months overdue.

  3. A repair order states: 'Tighten all M12 bolts on conveyor frame to 75 Nm using an impact wrench set to maximum torque.' The specification sheet calls for 75 Nm with a calibrated torque wrench. What error is present in the repair order?

    Answer: Impact wrenches do not provide calibrated, controlled torque and should not be used for spec-critical fastening

    Impact wrenches cannot reliably deliver a precise torque value; a calibrated torque wrench is required when a specific torque must be verified.

  4. A PM record for a pallet jack shows: 'Wheels inspected: OK. Forks inspected: OK. Hydraulic fluid level: LOW — topped off with AW-46. Load test: PASS.' The equipment manual specifies the hydraulic system requires AW-32 fluid. What is the error?

    Answer: The wrong viscosity hydraulic fluid was added to the system

    AW-46 has a higher viscosity than the specified AW-32, and mixing or substituting fluids can cause improper hydraulic system operation.

  5. An equipment inspection tag shows: 'Overhead crane — Rated capacity: 2 tons. Load tested: 2.5 tons. Last inspection: June 2025. Next inspection due: June 2027.' OSHA standard 1910.179 requires annual inspection of overhead cranes. What is the error?

    Answer: The next inspection should be June 2026, not June 2027

    Annual inspection requirements mean the next inspection should be one year after the last, June 2026, not two years later in June 2027.

  6. A work order for replacing a conveyor motor belt reads: 'Belt P/N: B78. Length: 78 inches. Width: 21/32 inch. Quantity ordered: 3. Cost per belt: $12.50. Total: $37.50.' What, if anything, is incorrect?

    Answer: There is no error — 3 × $12.50 = $37.50 is correct

    3 × $12.50 = $37.50, which matches the listed total, so there is no arithmetic error on this work order.

  7. A technician notes in a repair log: 'Motor overheating on sorter #5. Measured ambient temperature: 95°F. Motor rated for operation up to 104°F (40°C). Action taken: Installed larger cooling fan.' Is increasing fan size the correct diagnosis and fix?

    Answer: Not necessarily — 95°F ambient is within the rated limit, so the root cause of overheating may be elsewhere

    Since 95°F ambient is below the 104°F rated limit, ambient heat alone does not explain overheating — the technician should investigate other causes such as overloading, dirty windings, or failed bearings.