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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 maintenance schedule card reads: 'Grease spindle bearings on flat sorter every 3 months. Last greased: January 10, 2026. Next due: May 10, 2026.' Is the next due date correct?

    Answer: No — 3 months after January 10 is April 10, not May 10

    Three months after January 10 is April 10, not May 10; the next due date on the card is one month too late.

  2. A tool inventory sheet lists: 'Torque wrench Cal. #TW-04 — Calibration date: 02/01/2026 — Calibration interval: 6 months — Next cal. due: 09/01/2026.' What error is on this record?

    Answer: Next calibration should be 08/01/2026, not 09/01/2026

    Six months after February 1 is August 1, so the next calibration due date should be 08/01/2026, not 09/01/2026.

  3. A facility's electrical panel directory shows: 'Breaker 14 — Conveyor A motor — 20A. Breaker 16 — Conveyor B motor — 20A. Breaker 18 — Lighting circuit — 20A.' A technician switches off Breaker 16 to work on Conveyor B, but Conveyor B continues running. What does this indicate?

    Answer: The panel directory contains an error — Breaker 16 may not control Conveyor B

    If Conveyor B keeps running after its labeled breaker is opened, the panel directory is likely mislabeled or incorrect.

  4. A repair invoice for postal vehicle #V-221 lists: 'Oil change — 5W-30 synthetic, 6 quarts: $54.00. Labor 0.5 hr @ $90/hr: $45.00. Shop supplies: $8.00. Subtotal: $107.00. Tax (8%): $8.24. Total: $115.24.' Is the subtotal correct?

    Answer: Yes — $54 + $45 + $8 = $107

    $54.00 + $45.00 + $8.00 = $107.00, so the subtotal is correct.

  5. A conveyor maintenance log records: 'Replaced photo-eye sensor on line 3. Old sensor: NPN output. New sensor installed: PNP output. Wiring unchanged from previous installation.' What error did the technician introduce?

    Answer: NPN and PNP sensors have opposite output logic and require different wiring — reusing the old wiring will cause the sensor to malfunction

    NPN and PNP sensors switch to different voltage rails (ground vs. supply), so the original wiring is not compatible with the new sensor type.

  6. A parts order shows 4 identical gaskets ordered at $6.25 each, with a 10% bulk discount applied. The form lists the total as $22.50. Is this total correct?

    Answer: Yes — 4 × $6.25 = $25.00 minus 10% = $22.50

    4 × $6.25 = $25.00; a 10% discount = $2.50; $25.00 − $2.50 = $22.50, so the total is correct.

  7. A maintenance technician is instructed to apply a 'medium-strength threadlocker' to fasteners on a mail processing machine's access panel. The technician uses high-strength (red) threadlocker instead because it was the only type available. What problem does this create?

    Answer: High-strength threadlocker may require heat or special tools to disassemble, making future maintenance difficult

    High-strength (red) threadlocker is designed for permanent fastening and typically requires heat above 500°F to break loose, making future disassembly difficult or damaging.