USPS Error Detection Maintenance & Mechanics Flashcards

Which of the following sentences contains an error? (A) The conveyor belt requires lubrication every 500 operating hours. (B) Maintenance technicians should wear protective equipment while servicing machinery. (C) The sorting machine was repaired after it's motor overheated during peak hours. (D) All mechanical failures must be reported to the shift supervisor immediately.

Answer: Sentence C

Sentence C incorrectly uses "it's" (a contraction of "it is") instead of the possessive pronoun "its."

Which of the following sentences contains an error? (A) Preventative maintenance schedules are posted on the bulletin board weekly. (B) The mail processing equipment have been upgraded to meet new safety standards. (C) Technicians must complete a safety checklist before performing any repairs. (D) Worn belts should be replaced before they cause additional damage to the system.

Answer: Sentence B

Sentence B has a subject-verb agreement error; "equipment" is singular and requires "has" instead of "have."

Which of the following sentences contains an error? (A) The postal vehicle's brakes were inspected and found to be in good condition. (B) Each delivery truck is scheduled for routine maintenance every three months. (C) The mechanic replaced the alternator, the battery, and checked the starter. (D) Fleet vehicles must pass a safety inspection before returning to active routes.

Answer: Sentence C

Sentence C has a parallel structure error; the series should consistently use the same grammatical form.

Which of the following sentences contains an error? (A) Automated flat sorting machines require calibration after any major component replacement. (B) The maintenance crew completed they're assigned tasks ahead of schedule. (C) Hydraulic fluid levels should be checked at the start of every shift. (D) Faulty sensors can cause packages to be misrouted during processing.

Answer: Sentence B

Sentence B incorrectly uses "they're" (they are) instead of the possessive pronoun "their."

Which of the following sentences contains an error? (A) The loading dock door mechanism was jammed due to a broken spring. (B) Neither the supervisor nor the technicians was available to address the malfunction. (C) Regular cleaning of optical scanners helps maintain accurate barcode readings. (D) Emergency shutdown procedures are clearly posted near all heavy machinery.

Answer: Sentence B

Sentence B should use "were" instead of "was" because the verb must agree with the nearer plural subject "technicians."

Which of the following sentences contains an error? (A) Replacing the toner cartridge in the label printer is a simple procedure. (B) The maintenance log indicates that the air compressor was serviced last Tuesday. (C) Mechanical failures that goes unreported can lead to costly equipment downtime. (D) All power tools must be stored in designated cabinets when not in use.

Answer: Sentence C

Sentence C has a subject-verb agreement error; "failures" is plural and requires "go" instead of "goes."