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ASE Truck Equipment

TE3 Truck Equipment — Auxiliary Power — practice test

Studying for TE3 (Truck Equipment — Auxiliary Power)? Overhaul Prep has 168 verified TE3 questions written to the current task list — in the same formats the real exam uses (direct, Technician A/B, EXCEPT and most-likely-cause). Every answer comes with a written explanation, so you learn why instead of memorising a letter.

168TE3 questions
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Sample TE3 questions

Straight from the bank — answers highlighted, with the explanation underneath.

A transmission-mounted PTO is rated at "58%." This rating indicates that the:

  1. PTO can transmit 58% of engine torque
  2. PTO output shaft turns at 58% of engine crankshaft speed
  3. PTO is 58% mechanically efficient
  4. PTO engages at 58 psi air pressure
WhyPTO speed percentage expresses output-shaft rpm as a fraction of engine rpm, set by the transmission's PTO drive-gear ratio; a 58% PTO at 2000 engine rpm turns about 1160 rpm. It is not a torque, efficiency, or pressure figure.

Technician A says a PTO's output speed depends on the transmission's PTO drive-gear ratio and engine rpm. Technician B says any clutch-shift PTO can be safely engaged at full engine speed without using the clutch. Who is correct?

  1. Technician A only
  2. Technician B only
  3. Both Technicians A and B
  4. Neither Technician
WhyA is right: output speed equals engine rpm times the PTO percentage. B is wrong: clutch-shift PTOs need the master clutch depressed to avoid gear clash; only hot-shift PTOs engage under power.

Immediately after a new transmission-mounted PTO is installed, it produces a high-pitched whine that rises with engine speed. This is MOST likely caused by:

  1. Excessive gear backlash between the PTO and transmission gear
  2. Insufficient gear backlash (too few mounting gaskets)
  3. A worn PTO output-shaft bearing
  4. Low transmission fluid level
WhyA whine or squeal indicates the PTO gear is meshed too tightly with too little backlash, usually from too few mounting gaskets; adding gaskets increases backlash. Excessive backlash instead produces a rattle or knock.

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