Alberta Air Brake (Q) Practice Test 2026: Test de práctica 2

Test de práctica 2 de 2 de Alberta Air Brake (Q) Practice Test: 35 preguntas más con respuestas y explicaciones.

Vehículo comercial
Alberta
60 preguntas
Revisado el 10 de octubre de 2026

Pregunta 1 de 35
How quickly should the compressor build pressure from 50 to 90 psi at the governed engine speed?
- Within 10 seconds
- Within 3 minutes
- Within 10 minutes
- Within 30 minutes
Ver respuesta
Respuesta: B. Within 3 minutes
Compressor build-up from 50 to 90 psi should take no more than three minutes.
Pregunta 2 de 35
In the Alberta trip test, what is the normal range for governor cut-out pressure?
- 90 to 100 psi
- 60 to 80 psi
- 150 to 175 psi
- 120 to 135 psi
Ver respuesta
Respuesta: D. 120 to 135 psi
The governor should cut out between 120 and 135 psi.
Pregunta 3 de 35
How far below the cut-out pressure should the governor cut in?
- It cuts in at the same pressure
- 50 to 60 psi lower
- 20 to 25 psi lower
- 1 to 2 psi lower
Ver respuesta
Respuesta: C. 20 to 25 psi lower
The cut-in pressure should be about 20 to 25 psi lower than the cut-out pressure.
Pregunta 4 de 35
In the applied leakage check with full brake application, what is the most a power unit alone may lose in 2 minutes?
- 4 psi
- 1 psi
- 20 psi
- 10 psi
Ver respuesta
Respuesta: A. 4 psi
The guide allows a loss of 4 psi in 2 minutes for a power unit, plus 2 psi for each trailer.
Pregunta 5 de 35
What is the minimum size of wheel chocks for a commercial vehicle?
- 10 cm by 10 cm
- 30 cm by 30 cm
- 15 cm by 15 cm
- 5 cm by 5 cm
Ver respuesta
Respuesta: C. 15 cm by 15 cm
Wheel chocks must be at least 15 cm by 15 cm.
Pregunta 6 de 35
About how much time is added to your stopping distance by air brake lag?
- No time at all
- About 0.4 seconds
- About 4 seconds
- About 1 minute
Ver respuesta
Respuesta: B. About 0.4 seconds
Air brake lag time is about 0.4 seconds, added to about 0.75 seconds of perception and 0.75 seconds of reaction.
Pregunta 7 de 35
According to the Commercial Driver's Guide, about how long does it take a driver to perceive a hazard?
- About 0.1 seconds
- About 0.75 seconds
- About 5 seconds
- About 3 seconds
Ver respuesta
Respuesta: B. About 0.75 seconds
Perception time is about 0.75 seconds, and reaction time is about another 0.75 seconds.
Pregunta 8 de 35
Why should you not pump air brakes during a normal stop?
- Pumping wastes air and lowers system pressure
- It is the only way to stop
- It locks the steering
- It makes the brakes too hot to touch
Ver respuesta
Respuesta: A. Pumping wastes air and lowers system pressure
Apply steady pressure and ease off as you slow. Pumping uses up air.
Pregunta 9 de 35
You are about to descend a hill and the air pressure is dropping abnormally. What should you do?
- Do not go down the hill until the problem is fixed
- Go down quickly before the pressure is gone
- Shift to neutral and coast down slowly
- Use only the trailer hand valve on the way down
Ver respuesta
Respuesta: A. Do not go down the hill until the problem is fixed
Test your brakes before descending, and do not proceed if air pressure drops abnormally.
Pregunta 10 de 35
Why should you not hold a combination on a hill with only the trailer hand valve?
- It drains the fuel tank and stalls the engine
- It is the safest way to hold a combination
- It turns off the trailer lights and the horn
- The trailer brakes can leak off, and using them alone risks a jackknife
Ver respuesta
Respuesta: D. The trailer brakes can leak off, and using them alone risks a jackknife
Do not rely on the trailer hand valve alone. Use the spring brakes to park.
Pregunta 11 de 35
This diagram shows an air brake system. What drives the air compressor?
- The engine
- The brake pedal
- The trailer wheels
- A hand pump
Ver respuesta
Respuesta: A. The engine
The compressor is driven by the engine and pumps air into the storage tanks.
Pregunta 12 de 35
Which part tells the compressor when to start and stop pumping air?
- The foot valve
- The governor
- The slack adjuster
- The brake drum
Ver respuesta
Respuesta: B. The governor
The governor senses tank pressure and controls the compressor's cut-in and cut-out.
Pregunta 13 de 35
Why do air tanks have drain valves?
- To check the tire pressure at each wheel
- To release the parking brakes by hand
- To let fresh air into the tanks
- To remove water and oil that collect in the tanks
Ver respuesta
Respuesta: D. To remove water and oil that collect in the tanks
Compressed air leaves water and oil in the tanks. Drain them so they do not freeze or damage valves.
Pregunta 14 de 35
What happens when you press the brake pedal (foot valve) in an air brake system?
- Air is sent to the brake chambers, which apply the brakes
- The spring brakes release so the wheels can turn
- The compressor stops and the tanks are sealed
- Air is released from the tires to slow the wheels
Ver respuesta
Respuesta: A. Air is sent to the brake chambers, which apply the brakes
The foot valve sends air from the tanks to the brake chambers, which push the rods that apply the brakes.
Pregunta 15 de 35
What does the slack adjuster do?
- It dries the air before it reaches the tanks
- It turns the brake camshaft when the push rod moves
- It measures the air pressure in the tanks
- It holds the trailer to the tractor
Ver respuesta
Respuesta: B. It turns the brake camshaft when the push rod moves
The push rod moves the slack adjuster, which turns the camshaft and forces the shoes against the drum.
Pregunta 16 de 35
In an S-cam brake, what forces the brake shoes against the drum?
- A hydraulic cylinder
- Magnets
- The driver's leg strength
- The S-shaped cam turning
Ver respuesta
Respuesta: D. The S-shaped cam turning
When the camshaft turns, the S-cam spreads the shoes against the drum.
Pregunta 17 de 35
What does the safety valve do?
- Applies the brakes when you go too fast
- Releases air if tank pressure gets too high
- Removes water and oil from the tanks
- Stops the engine if the air gets too hot
Ver respuesta
Respuesta: B. Releases air if tank pressure gets too high
The safety valve protects the tanks from too much pressure by letting air out.
Pregunta 18 de 35
What is the main safety feature of spring brakes?
- They only work at high speed on highways
- They apply automatically if air pressure is lost
- They replace the service brakes when driving
- They need extra air pressure to apply
Ver respuesta
Respuesta: B. They apply automatically if air pressure is lost
Air holds spring brakes off. If pressure is lost, the springs apply the brakes.
Pregunta 19 de 35
How should you park an air-brake vehicle?
- Apply the spring (parking) brakes
- Put a brick on the brake pedal
- Hold the service brakes with the trailer hand valve
- Leave it in gear only
Ver respuesta
Respuesta: A. Apply the spring (parking) brakes
Use the spring brakes to park. Service brakes rely on air, which can leak away.
Pregunta 20 de 35
What is the advantage of a dual air brake system?
- If one circuit fails, the other can still stop you
- It never needs a pre-trip inspection
- It lets you drive at a higher top speed
- It does not need an air compressor
Ver respuesta
Respuesta: A. If one circuit fails, the other can still stop you
A dual system has two separate circuits, so a failure in one still leaves braking from the other.
Pregunta 21 de 35
Which colour is usually used for the emergency (supply) air line between tractor and trailer?
- Red
- Yellow
- Blue
- Green
Ver respuesta
Respuesta: A. Red
The emergency or supply line is usually red and the service line is blue.
Pregunta 22 de 35
What does the tractor protection valve do?
- Controls the headlights and trailer lights
- Protects the tractor's air if the trailer lines break
- Locks the fifth wheel jaws around the kingpin
- Measures the trailer's weight on each axle
Ver respuesta
Respuesta: B. Protects the tractor's air if the trailer lines break
It closes off the trailer lines so the tractor keeps its air if the trailer breaks away.
Pregunta 23 de 35
What does a low air pressure warning tell you?
- The compressor is working normally
- The air tanks are completely full
- Pressure is dropping and you are losing braking ability
- The tires need more air in them
Ver respuesta
Respuesta: C. Pressure is dropping and you are losing braking ability
The warning means pressure is low. Stop safely and find the cause before the spring brakes apply.
Pregunta 24 de 35
What happens to stopping distance when you double your speed?
- It becomes about half as long
- It about doubles
- It stays about the same
- It becomes about four times as long
Ver respuesta
Respuesta: D. It becomes about four times as long
Stopping distance grows with the square of speed, so doubling speed makes it about four times as long.
Pregunta 25 de 35
Your brakes get very hot on a long hill and stop working as well. What is this called?
- Brake creep
- Brake fade
- Brake lock
- Brake lag
Ver respuesta
Respuesta: B. Brake fade
Overheated brakes lose effectiveness. Use a low gear and engine braking on long grades.
Pregunta 26 de 35
What is the best way to check whether a brake is out of adjustment?
- Feel the tire temperature after a trip
- Look at the paint on the brake drum
- Listen to the brake while driving slowly
- Measure the push rod stroke with the brakes applied
Ver respuesta
Respuesta: D. Measure the push rod stroke with the brakes applied
Brake adjustment is checked by measuring push rod stroke with a full brake application.
Pregunta 27 de 35
Why is moisture in the air system a problem?
- It makes the brakes grab too strongly
- It cools the compressor too much in summer
- It can freeze and block lines and valves
- It is not a problem in a modern system
Ver respuesta
Respuesta: C. It can freeze and block lines and valves
Water can freeze and stop valves or lines from working. Drain tanks and use the air dryer.
Pregunta 28 de 35
Brake lag means the brakes on an air-brake vehicle take time to apply. What does this mean for following distance?
- You can follow more closely
- Following distance does not matter
- You should brake later
- You need more space ahead than a car does
Ver respuesta
Respuesta: D. You need more space ahead than a car does
Air brake lag adds to your stopping distance, so leave a bigger gap.
Pregunta 29 de 35
Your spring brakes apply suddenly while you are driving. What is the most likely cause?
- A serious loss of air pressure
- The trailer is empty and light
- The engine is still too cold
- The governor has cut out normally
Ver respuesta
Respuesta: A. A serious loss of air pressure
Spring brakes come on when system pressure drops too low.
Pregunta 30 de 35
Before starting the air brake test, how should the vehicle be secured?
- Release all brakes
- Leave it in neutral without chocks
- Park on a hill facing down
- Park on level ground and chock the wheels
Ver respuesta
Respuesta: D. Park on level ground and chock the wheels
Secure the vehicle with wheel chocks on level ground before testing the brakes.
Pregunta 31 de 35
What appears on your licence card after you pass the Alberta air brake knowledge test?
- The Q endorsement
- A red stripe
- Nothing changes
- A new licence class
Ver respuesta
Respuesta: A. The Q endorsement
Passing the knowledge test adds the Q endorsement to your licence card.
Pregunta 32 de 35
What must you show at the registry agent before you can write the air brake knowledge test?
- A letter from your employer or school
- Your truck's registration and insurance
- Your Notice of Air Brake Program Completion
- Your Class 1 road test result
Ver respuesta
Respuesta: C. Your Notice of Air Brake Program Completion
Bring the Notice you received after passing the practical assessment.
Pregunta 33 de 35
After a failed practical reassessment, who decides what additional training you need?
- A police officer at a weigh scale
- Your insurance company
- The driver training school and the student
- The registry agent who sells you the test
Ver respuesta
Respuesta: C. The driver training school and the student
Any additional training is decided by the driver training school and the student.
Pregunta 34 de 35
In the applied leakage check, what is the most a tractor with one trailer may lose in 2 minutes under the guide's figures?
- 12 psi
- 2 psi
- 4 psi
- 6 psi
Ver respuesta
Respuesta: D. 6 psi
The guide allows 4 psi for the power unit plus 2 psi for each trailer, so 6 psi for a tractor and one trailer.
Pregunta 35 de 35
Which form is used for the one-on-one air brake practical assessment in Alberta?
- A daily log
- The Air Brake Practical Test form
- The vehicle registration form
- A trip inspection report
Ver respuesta
Respuesta: B. The Air Brake Practical Test form
The practical assessment is done on the Air Brake Practical Test form within 15 minutes.

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