Cert III Heavy Commercial Vehicle Practice Questions - Certificate III in Heavy Commercial Vehicle Mechanical Technology (AUR31120) Exam - Cert III Heavy Commercial Vehicle Practice Questions - Certificate III in Heavy Commercial Vehicle Mechanical Technology (AUR31120) Exam

Question 1

In a compression ignition (diesel) engine, how is fuel ignited in the combustion chamber?

By the heat of compressed air By a spark plug By a glow plug during normal operation By an electrical ignition coil

Correct Answer:

By the heat of compressed air

Question 2

What is the primary purpose of a turbocharger on a heavy vehicle diesel engine?

To reduce exhaust noise To increase the mass of air entering the cylinders for greater power output To cool the engine oil before it returns to the sump To regulate fuel pressure in the injection system

Correct Answer:

To increase the mass of air entering the cylinders for greater power output

Question 3

A Variable Geometry Turbocharger (VGT) improves engine performance by:

Changing the angle of vanes in the turbine housing to control boost at varying engine speeds Using two separate turbochargers that engage at different RPM ranges Bypassing exhaust gas around the turbine at high RPM via a wastegate Adjusting the compressor wheel diameter mechanically during operation

Correct Answer:

Changing the angle of vanes in the turbine housing to control boost at varying engine speeds

Question 4

In a common rail diesel injection system, fuel pressure in the rail can reach up to approximately:

200 bar 500 bar 1,000 bar 2,000 bar or more

Correct Answer:

2,000 bar or more

Question 5

During active DPF (Diesel Particulate Filter) regeneration, what happens inside the filter?

The filter is physically removed and cleaned with compressed air Accumulated soot is burned off at elevated exhaust temperatures, typically above 550 °C A chemical cleaning agent is injected into the filter housing The filter reverses airflow direction to blow soot out through the exhaust pipe

Correct Answer:

Accumulated soot is burned off at elevated exhaust temperatures, typically above 550 °C

Question 1

Exam overview

About this Exam

Prepare with the Cert III Heavy Commercial Vehicle Practice Questions - Certificate III in Heavy Commercial Vehicle Mechanical Technology (AUR31120) Exam practice quiz. This question bank includes 100 questions covering heavy, vehicle, diesel, brake, and engine. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

More details

Additional Information

Cert III Heavy Commercial Vehicle Practice Questions - Certificate III in Heavy Commercial Vehicle Mechanical Technology (AUR31120) Exam

This practice set contains 100 questions from the matching question bank and focuses on heavy, vehicle, diesel, brake, and engine. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

Quiz information

Frequently Asked Questions

The complete question count is available after full access is unlocked.

No fixed duration is currently configured for this quiz.

Question explanations are included where they are available in the quiz content, helping you review the reasoning after answering.

Yes. You can retake the practice test again as you continue studying during your available access period.

After your access is confirmed, you can continue into the complete practice exam from this quiz flow.

Unless explicitly stated otherwise, this page provides independent practice material for study and exam preparation and is not the official examination itself.

Keep studying

Correct Answer:

Correct Answer:

Correct Answer:

Correct Answer:

Correct Answer:

About this Exam

Additional Information

Cert III Heavy Commercial Vehicle Practice Questions - Certificate III in Heavy Commercial Vehicle Mechanical Technology (AUR31120) Exam

Frequently Asked Questions

Related Questions

ISC2 Certified in Cybersecurity Practice Exam

120-Hour TESOL Certificate Practice Test

2026 FFM Agent Broker Certification Practice Exam

340B Program Operations Certificate Practice Exam

3CX Academy Advanced Certification Practice Exam

3CX Academy Basic Certification Practice Exam