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ASE Medium / Heavy Truck

T2 Diesel Engines — practice test

Studying for T2 (Diesel Engines)? Overhaul Prep has 119 verified T2 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.

119T2 questions
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9,711questions in total
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Sample T2 questions

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

A diesel turbocharger uses which of the following to spin the compressor wheel?

  1. Engine oil pressure
  2. Exhaust gas flowing across the turbine wheel
  3. A gear drive off the camshaft
  4. Intake vacuum
WhyA turbocharger is exhaust-driven: exhaust gas spins the turbine wheel, which is on a common shaft with the compressor wheel that pressurizes the intake. Oil is used only for bearing lubrication/cooling, not to drive it.

Technician A says active DPF regeneration lowers exhaust temperature to burn off trapped soot. Technician B says passive regeneration occurs during normal highway driving with no added fuel or driver action. Who is correct?

  1. Technician A only
  2. Technician B only
  3. Both Technicians A and B
  4. Neither Technician
WhyActive regen RAISES exhaust temperature (roughly 550-600 C) by dosing extra fuel to oxidize soot, not lowers it. Passive regen occurs at normal operating temperatures using NO2 from the DOC, with no driver action. Only Technician B is correct.

All of the following are true of an exhaust gas recirculation (EGR) system on a diesel engine EXCEPT:

  1. It lowers peak combustion temperature to reduce NOx formation
  2. It routes a metered amount of exhaust gas back into the intake
  3. An EGR cooler further lowers the temperature of the recirculated gas
  4. It increases cylinder oxygen concentration to promote complete combustion
WhyEGR displaces oxygen with inert exhaust gas and lowers peak combustion temperature, which reduces NOx; it does not increase cylinder oxygen (that would raise NOx).

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