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ASE Medium / Heavy Truck

T6 Electrical / Electronic Systems — practice test

Studying for T6 (Electrical / Electronic Systems)? Overhaul Prep has 114 verified T6 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.

114T6 questions
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9,711questions in total
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Sample T6 questions

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

Ohm's law states that voltage equals:

  1. Current divided by resistance
  2. Current multiplied by resistance (E = I × R)
  3. Resistance divided by current
  4. Power multiplied by current
WhyOhm's law: E = I × R (Voltage = Current × Resistance). It's the foundation of electrical diagnosis — a voltage drop across a connection equals current times that connection's resistance.

Technician A says that to measure current, the ammeter (or clamp) must be placed in series with the load. Technician B says a voltmeter is connected in parallel, across the component being tested. Who is correct?

  1. Technician A only
  2. Technician B only
  3. Both Technicians A and B
  4. Neither Technician
WhyAn ammeter must be in series so all circuit current passes through it (or a clamp encircles the conductor). A voltmeter is connected in parallel across the load to measure potential difference. Both statements are correct.

A charging system test shows battery voltage stays at 12.4 V with the engine running at 1500 rpm and loads on. The MOST likely cause is:

  1. An overcharging alternator
  2. An undercharging alternator or high resistance in the charge circuit
  3. A shorted starter
  4. Normal operation
WhyWith the engine running, a good charging system should read roughly 13.5–14.5 V. Staying at battery voltage means the alternator isn't charging — bad alternator/regulator, broken belt, blown fusible link, or high resistance in the charge/ground path.

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