USPS Maintenance & Mechanics 2 — Questions and Answers
Question 1: A maintenance log entry reads: 'Replaced conveyor belt drive motor on Unit 4B. Motor model: 3HP-208V-60Hz. Installation date: 03/14/2026. Torque spec: 45 ft-lbs. Completed by: Tech J. Harmon.' Which field contains an error if the facility runs on 480V three-phase power?
- Installation date
- Motor model voltage rating (Correct answer)
- Torque specification
- Technician name
Correct answer: Motor model voltage rating
The motor is rated 208V but the facility operates on 480V, making the voltage rating an error that would cause equipment failure.
Question 2: A work order states: 'Lubricate all conveyor chain links using SAE 30 oil every 500 hours.' The equipment manual specifies chain lubrication every 250 hours with ISO 220 gear oil. What is the error in the work order?
- The lubricant type only
- Both the interval and lubricant type (Correct answer)
- The interval only
- There is no error — SAE 30 is equivalent to ISO 220
Correct answer: Both the interval and lubricant type
Both the lubrication interval (500 vs. 250 hours) and the lubricant type (SAE 30 oil vs. ISO 220 gear oil) are incorrect.
Question 3: A parts request form lists: 'Item: Conveyor roller bearing. Part #: 6205-2RS. Qty: 12. Unit cost: $4.80. Total: $57.60.' What is the arithmetic error in this form?
- The total should be $48.00, not $57.60
- The total should be $62.40, not $57.60
- No arithmetic error — $57.60 is correct (Correct answer)
- The part number format is wrong
Correct answer: No arithmetic error — $57.60 is correct
12 × $4.80 = $57.60 is mathematically correct, so there is no arithmetic error on this form.
Question 4: A safety inspection checklist entry reads: 'Fire extinguisher Station 7: Last inspected 11/2025. Next inspection due: 11/2027.' If USPS policy requires annual fire extinguisher inspections, what is the error?
- The inspection station number
- The last inspection date
- The next inspection due date should be 11/2026, not 11/2027 (Correct answer)
- There is no error — biennial inspection is standard
Correct answer: The next inspection due date should be 11/2026, not 11/2027
Annual inspections mean the next due date should be 12 months after the last, so 11/2026, not 11/2027.
Question 5: A repair record states: 'Flat belt replaced on sorter #3. Belt dimensions: 6 inches wide × 48 feet long. Tension set to 120 PSI. Belt speed: 250 FPM.' The technician's manual states belt tension should be 80–100 PSI. What error is present?
- Belt width is incorrect
- Belt tension exceeds the specified range (Correct answer)
- Belt speed is too high
- Belt length is inconsistent with sorter #3 specs
Correct answer: Belt tension exceeds the specified range
120 PSI exceeds the allowable tension range of 80–100 PSI, indicating the belt was over-tensioned.
Question 6: A maintenance schedule shows Machine A receives a full inspection every 1,000 hours. The machine's current meter reads 7,340 hours, and the last full inspection was at 6,500 hours. According to the schedule, is an inspection overdue?
- No — the next inspection is due at 7,500 hours and the meter reads 7,340 (Correct answer)
- Yes — it was due at 7,000 hours
- Yes — an inspection is overdue by 340 hours
- No — inspections reset only at shift change
Correct answer: No — the next inspection is due at 7,500 hours and the meter reads 7,340
6,500 + 1,000 = 7,500 hours; since the meter reads 7,340, the next inspection is not yet due.
Question 7: A work order requests replacement of a 15-amp circuit breaker with a 20-amp breaker because 'the 15-amp breaker keeps tripping.' What is the likely error in this corrective action?
- Circuit breakers cannot be replaced in a postal facility
- Increasing breaker amperage without diagnosing the root cause may create a fire hazard (Correct answer)
- A 20-amp breaker is always too large for postal equipment
- Work orders cannot specify electrical repairs
Correct answer: Increasing breaker amperage without diagnosing the root cause may create a fire hazard
Replacing a breaker with a higher-rated one without finding the cause of tripping can allow unsafe current levels, creating a fire hazard.
USPS Maintenance & Mechanics 2
A maintenance log entry reads: 'Replaced conveyor belt drive motor on Unit 4B.
Motor model: 3HP-208V-60Hz.
Installation date: 03/14/2026.
Torque spec: 45 ft-lbs.
Completed by: Tech J.
Harmon.' Which field contains an error if the facility runs on 480V three-phase power?