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ASE Automobile & Light Truck (A1–A8) — Practice Exam

A1 Lubrication and cooling: practice questions

Our ASE A1–A8 bank has 9 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1 · A1 Engine Repair

After refilling a cooling system, why must air be bled out?

  1. It isn't necessary on modern engines
  2. Trapped air can cause hot spots, overheating and poor heater output
  3. Air raises the freeze point
  4. Air dilutes the coolant and raises its freeze point over time
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B. Trapped air can cause hot spots, overheating and poor heater output — Use bleeder valves or a vacuum fill tool as the maker specifies.

Question 2 · A1 Engine Repair

An engine has low oil pressure at hot idle only. Which is a likely cause?

  1. Worn main and rod bearings
  2. A stuck-closed thermostat raising oil temperature
  3. A clogged air filter
  4. A weak battery
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A. Worn main and rod bearings — Hot, thinner oil leaks more through worn clearances. Confirm with a mechanical gauge.

Question 3 · A1 Engine Repair

A mechanical fan clutch that spins freely when the engine is hot can cause what?

  1. Overheating at idle and low speed
  2. Low oil pressure
  3. Overcooling
  4. Overheating only at highway speed
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A. Overheating at idle and low speed — Airflow from vehicle speed cools the radiator on the highway.

Question 4 · A1 Engine Repair

How should oil pressure be verified when the warning light is on?

  1. By checking the oil color
  2. With a mechanical gauge in place of the sending unit
  3. By reading the oil filter label
  4. By listening to the engine and checking the dash gauge reading
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B. With a mechanical gauge in place of the sending unit — A faulty sender or circuit can cause a false warning.

Question 5 · A1 Engine Repair

Exhaust gases in the coolant can be confirmed with which test?

  1. A cooling system pressure test only, with the engine cold
  2. A chemical block (combustion leak) tester
  3. A refractometer
  4. An oil pressure test
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B. A chemical block (combustion leak) tester — The test fluid changes color when exposed to combustion gases.

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