USPS - Error Detection Test Error Detection Maintenance & Mechanics 1 — Questions and Answers
Question 1: Which of the following sentences contains an error?
- The pneumatic tube system requires pressure adjustments on a quarterly basis.
- Maintenance logs must be signed by the supervising technician after each service.
- The gear assembly was replaced because its teeth had became worn beyond tolerance. (Correct answer)
- Safety valves should be tested regularly to prevent dangerous pressure buildup.
Correct answer: The gear assembly was replaced because its teeth had became worn beyond tolerance.
Option C contains a verb form error. 'Had became' is incorrect; the past participle of 'become' is 'become,' so the correct phrase is 'had become.'
Question 2: Which of the following sentences contains an error?
- The forklift operator must inspect the vehicle before each shift begins.
- Loose bolts on the conveyor frame was tightened during the overnight maintenance window. (Correct answer)
- Oil spills near machinery should be cleaned up immediately to prevent accidents.
- The facility manager approved the equipment replacement request last Friday.
Correct answer: Loose bolts on the conveyor frame was tightened during the overnight maintenance window.
Option B has a subject-verb agreement error. The subject 'bolts' is plural, so the verb should be 'were tightened,' not 'was tightened.'
Question 3: Which of the following sentences contains an error?
- The technician drained the hydraulic fluid, replaced the filter, and refilling the reservoir. (Correct answer)
- Emergency shutoff switches must be accessible at all times during operations.
- The maintenance department has submitted a work order for the broken conveyor.
- All power tools used in the repair shop must be inspected before each use.
Correct answer: The technician drained the hydraulic fluid, replaced the filter, and refilling the reservoir.
Option A has a faulty parallel structure. The series uses past tense verbs ('drained,' 'replaced'), so the final item should be 'refilled,' not 'refilling.'
Question 4: Which of the following sentences contains an error?
- Package sorting errors increased after the scanner's calibration was skipped.
- The maintenance team follow a strict protocol when servicing high-voltage equipment. (Correct answer)
- Replacement parts for aging machinery are ordered well in advance to avoid delays.
- Workers are required to lock out equipment before beginning any repair work.
Correct answer: The maintenance team follow a strict protocol when servicing high-voltage equipment.
Option B has a subject-verb agreement error. 'Team' is a singular collective noun, so the correct verb is 'follows,' not 'follow.'
Question 5: Which of the following sentences contains an error?
- The diesel-powered generator is tested monthly to ensure reliable backup power.
- Technicians whom perform repairs on electrical systems must hold valid certifications. (Correct answer)
- Preventive maintenance reduces the likelihood of unexpected equipment failures.
- The damaged conveyor belt was replaced during the scheduled downtime period.
Correct answer: Technicians whom perform repairs on electrical systems must hold valid certifications.
Option B incorrectly uses 'whom' where 'who' is needed. Because the pronoun is the subject of the verb 'perform,' the subjective case 'who' is correct.
Question 6: Which of the following sentences contains an error?
- All maintenance records are stored in the facility's digital management system.
- The repair crew worked through the night to restore the sorters to full operation.
- Each mechanics tool bag is inspected for completeness at the start of every shift. (Correct answer)
- Faulty wiring in the control panel was identified and repaired by a licensed electrician.
Correct answer: Each mechanics tool bag is inspected for completeness at the start of every shift.
Option C is missing a possessive apostrophe. The bag belongs to the mechanic, so it should read 'mechanic's tool bag,' not 'mechanics tool bag.'
USPS - Error Detection Test Error Detection Maintenance & Mechanics 1
Which of the following sentences contains an error?