AF Commercial Driving Theory Practice Questions - Afghanistan Driving License Theory Test - Commercial & Heavy Vehicle Exam - AF Commercial Driving Theory Practice Questions - Afghanistan Driving License Theory Test

Question 1

What is the primary function of the air compressor in a heavy commercial vehicle's pneumatic brake system?

To pump compressed air into the storage reservoirs (air tanks) to supply the braking system To cool the engine cylinders during heavy braking To provide hydraulic fluid pressure to the clutch To inflate the cabin air conditioning system

Correct Answer:

To pump compressed air into the storage reservoirs (air tanks) to supply the braking system

Question 2

At approximately what pressure does the air compressor governor typically cut out (stop pumping air into the tanks)?

Around 120 to 125 PSI (approximately 8.3 to 8.6 bar) Around 40 to 50 PSI Around 250 to 300 PSI Around 10 to 15 PSI

Correct Answer:

Around 120 to 125 PSI (approximately 8.3 to 8.6 bar)

Question 3

At what air pressure must the low air pressure warning device (buzzer or red light) activate in a commercial air brake vehicle?

Before air pressure drops below approximately 60 PSI (around 4.1 bar) Only when air pressure reaches 0 PSI At 100 PSI Only when the vehicle comes to a complete halt

Correct Answer:

Before air pressure drops below approximately 60 PSI (around 4.1 bar)

Question 4

Why must air brake storage tanks be drained daily of water and oil accumulation?

Water and oil sludge can freeze in cold weather, block valves, corrode components, and cause brake failure To reduce vehicle total weight for fuel economy To allow fresh fuel to enter the air brake lines Draining tanks is only required once every 5 years during major overhauls

Correct Answer:

Water and oil sludge can freeze in cold weather, block valves, corrode components, and cause brake failure

Question 5

What happens when air pressure in a heavy vehicle's pneumatic system drops completely to zero while driving?

The powerful mechanical spring parking brakes (maxi brakes) automatically engage and lock the rear wheels The brakes release completely, leaving the vehicle to coast with no retardation The service brakes continue to work normally from a reserve air supply The engine shuts down automatically and the vehicle rolls to a halt

Correct Answer:

The powerful mechanical spring parking brakes (maxi brakes) automatically engage and lock the rear wheels

Exam overview

About this Exam

Prepare with the AF Commercial Driving Theory Practice Questions - Afghanistan Driving License Theory Test - Commercial & Heavy Vehicle Exam practice quiz. This question bank includes 100 questions covering commercial, truck, vehicle, heavy, and brake. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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AF Commercial Driving Theory Practice Questions - Afghanistan Driving License Theory Test - Commercial & Heavy Vehicle Exam

This practice set contains 100 questions from the matching question bank and focuses on commercial, truck, vehicle, heavy, and brake. 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.

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About this Exam

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AF Commercial Driving Theory Practice Questions - Afghanistan Driving License Theory Test - Commercial & Heavy Vehicle Exam

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