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ASE Transit Bus

H3 Transit Bus — Drive Train — practice test

Studying for H3 (Transit Bus — Drive Train)? Overhaul Prep has 169 verified H3 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.

169H3 questions
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9,711questions in total
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Sample H3 questions

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

The three primary members of a heavy-duty automatic transmission (Allison) torque converter are the:

  1. Impeller (pump), turbine, and stator
  2. Sun gear, planet carrier, and ring gear
  3. Rotor, stator, and armature
  4. Impeller, lockup clutch, and governor
WhyThe engine-driven impeller (pump) throws fluid against the turbine (output), and the stator redirects the returning fluid to multiply torque. These three elements make up the converter.

Technician A says the lockup (converter) clutch mechanically couples the engine to the turbine to eliminate converter slip and improve fuel economy. Technician B says once the lockup clutch is applied there is no torque multiplication. Who is correct?

  1. Technician A only
  2. Technician B only
  3. Both Technicians A and B
  4. Neither Technician
WhyThe lockup clutch ties impeller and turbine together for a 1:1 mechanical drive, removing slip; with no slip the converter is only coupling, not multiplying torque.

A transit bus engine runs and the shift selector responds, but the transmission produces no drive in any forward range or in reverse. The MOST likely cause is:

  1. Low or empty transmission fluid or a failed pump/converter (no hydraulic pressure)
  2. A single worn range clutch
  3. A faulty backup-lamp switch
  4. A driveshaft phasing error
WhyTotal loss of drive in every range points to a system-wide loss of hydraulic pressure, most often low fluid or a failed pump/converter, not one clutch.

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