USPS Exams 943, 944, 945 (2025/2026) || Verified Correct Answers on
Hydrocarbons, NOx & Combustion Already Graded A+
HC - (ANSWER)hydrocarbons
Hc is caused by - (ANSWER)Misfire
Nox - (ANSWER)High exhaust temps caused by high combustion temp
Egr open - (ANSWER)Lean
Egr closed - (ANSWER)Rich
Rich - (ANSWER)Black smoke
Lean - (ANSWER)White smoke
Secondary spring - (ANSWER)Goes on first
lower ball joint - (ANSWER)Load bearing
Vacuum range - (ANSWER)14-22 "
Cam to crank - (ANSWER)Crank turns 2 times per 1 cam rotation
What is used for piston pin diameter - (ANSWER)Micrometer
Amp - (ANSWER)Electrical current
Hydrocarbons, NOx & Combustion Already Graded A+
HC - (ANSWER)hydrocarbons
Hc is caused by - (ANSWER)Misfire
Nox - (ANSWER)High exhaust temps caused by high combustion temp
Egr open - (ANSWER)Lean
Egr closed - (ANSWER)Rich
Rich - (ANSWER)Black smoke
Lean - (ANSWER)White smoke
Secondary spring - (ANSWER)Goes on first
lower ball joint - (ANSWER)Load bearing
Vacuum range - (ANSWER)14-22 "
Cam to crank - (ANSWER)Crank turns 2 times per 1 cam rotation
What is used for piston pin diameter - (ANSWER)Micrometer
Amp - (ANSWER)Electrical current