Red Seal Automotive Service Technician Exam (Interprovincial)
E. Electrical, HVAC and comfort systems: practice questions
Our Red Seal Automotive Service Technician bank has 42 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.
Question 1
Which soldering hazard does the RSOS list for electrical repairs?
- Soldering fumes
- Refrigerant frostbite
- Airbag deployment
- Fuel injection pressure
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A. Soldering fumes — Electrical diagnosis hazards include damaging components, fire and soldering fumes.
Question 2
Under jurisdictional rules, what work on instrument clusters does the RSOS specifically flag?
- Changing bulbs
- Cleaning the lens
- Odometer servicing
- Setting the clock
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C. Odometer servicing — The RSOS lists odometer servicing as a jurisdictional regulation for instrumentation; mileage must be recorded correctly.
Question 3
A/C works at highway speed but warms up at idle. A common cause is:
- A failed blend door
- A dead blower motor
- An open cabin filter door
- Poor condenser airflow (cooling fan fault or debris)
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D. Poor condenser airflow (cooling fan fault or debris) — At idle the condenser relies on the fan; without airflow, high-side pressure rises and cooling falls off.
Question 4
Which anti-theft system does the RSOS list as a starting and charging control system?
- Immobilizer
- Cruise control
- Parking sensors
- Rain sensor
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A. Immobilizer — Control systems include anti-theft/immobilizer and safety interlock devices.
Question 5
How should an ammeter be connected to measure parasitic draw?
- In parallel across the battery posts
- In series between the battery post and the cable
- Across the alternator output
- Between the two battery cables with the engine running
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B. In series between the battery post and the cable — An ammeter must carry the circuit current, so it goes in series; across the posts it would short the battery.