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Commercial Drivers Licence Online Practice Test - Exam 3
Date :
19 / 10 / 2026
Q
1
)
You are traveling down a long, steep hill. Your brakes get so hot that they fail. What should you do?
Pump the brake pedal.
Down shift.
Look for an escape ramp or escape route.
All of the above.
Q
2
)
What factors determine your selection of "safe" speed when going down a long steep downgrade?
Size of vehicle‚ curves in the road.
Conditions of brakes‚ radio bulletins and alertness of driver.
Total weight of the vehicle‚ length of the grade‚ steepness‚ road conditions‚ and weather.
Q
3
)
Retarders keep you from skidding where the road is slippery.
TRUE
FALSE
Dont Know
None of the above
Q
4
)
Which of these statements about escape ramps is true?
They protect equipment and cargo from severe damage.
They are designed to prevent injury to drivers and passengers.
They are used to stop vehicles that lose their brakes on downhill grades.
All of the above are true.
Q
5
)
To avoid a crash, you had to drive onto the right shoulder. You are now driving at 40 MPH on the shoulder. How should you move back onto the pavement?
Keep moving at the present speed and steer very gently back onto the pavement.
Steer sharply onto the pavement and counter steer when both back wheels of your vehicle are on the pavement.
Brake hard to slow the vehicle‚ then steer sharply onto the pavement.
Come to a complete stop‚ if possible‚ before steering back onto the pavement.
Q
6
)
Truck escape ramps:
Cannot be used by certain types of heavy vehicles.
Are designed to protect vehicles from damage.
Should not be used unless you have first tried all other ways to save your vehicle after brake failure.
All of the above.
Q
7
)
During what time in your pre-trip inspection do you check the back emergency door? to insure it is closed
During step four lights first half the inside walk through.
Only during the operation inspection of the pre-trip.
Only during the inside walk through.
None of the above.
Q
8
)
Tie downs must be of the proper type and strength. The combined strength of cargo tie downs must be strong enough to lift.
One and one half times the weight of the cargo tied down.
Three times the weight of the cargo tied down.
Twice the weight of the cargo tied down.
The weight of the cargo tied down
Q
9
)
Your vehicle has hydraulic brakes. While traveling on a level road, you press the brake pedal and find that it goes to the floor. Which of these statements is true?
You should not downshift if you have an automatic transmission.
Pumping the brake pedal may bring the pressure up so you can stop the vehicle.
The parking brake will not work either because it is part of the same hydraulic system.
All of the above are true.
Q
10
)
Which fires can you use water to put out?
Gasoline fires.
Tire fires.
Electrical fires.
All of the above.
Q
11
)
If your vehicle has an alcohol evaporator, it is there to:
Reduce the risk of ice in air brake valves in cold weather.
Eliminate the need for daily tank draining.
Rid the wet tank of alcohol that condenses and sits at the bottom.
Boost tank pressure the same way that superchargers boost.
Q
12
)
The emergency brake system:
Uses parts of the service and parking brake system to stop the vehicle in the event of a brake system failure.
Uses the service brake to stop the vehicle in the event of a brake system failure.
Uses the parking brake to stop the vehicle in the event of a brake system failure.
Q
13
)
How can you check the slack adjuster?
Park on level ground‚ turn off parking brakes‚ pull hard on each slack adjuster. It should not move more than one inch.
Park on level ground‚ turn off parking brake and press brake pedal.
Park on an incline and see if the vehicle rolls.
None of the above
Q
14
)
Air brakes are really three different braking systems: service brake, parking brake and emergency brake.
TRUE
FALSE
Dont Know
None of the above
Q
15
)
What are the slack adjusters?
It is the space between the back wheels.
It is an adjusting nut on the backside of the brake drum used for adjusting the brakes.
It is an adjusting nut under the cab to adjust the springs.
None of the above
Q
16
)
How can you test the low pressure warning signal?
While the engine is running‚ step on and off the brake pedal.
Shut off the engine and see if the air pressure leaks down.
Shut off the engine with enough air pressure‚ turn on the electrical power and step on and off the brake pedal until the low air pressure warnin
Q
17
)
If the air compressor should develop a leak, what keeps the air in the tanks?
The tractor protection valve
The emergency relay valve
The one way check valve
The air compressor
Q
18
)
When you put on the brakes by pushing down the brake pedal:
The air pressure is reduced to the brake pads.
Air pressure is applied to the brake pads.
Compressed air is let go out of the system.
None of the above
Q
19
)
Should you ever leave your vehicle unattended without applying parking brakes or chocking the wheels?
Yes
No
Dont Know
None of the above
Q
20
)
Why must air tanks be drained?
To drain all the air out of the tank.
To keep anyone from moving the vehicle.
None of the above
Minumum pass for the test is 75%
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Commercial Drivers Licence
Commercial Driver Licence Test 1
Commercial Driver Licence Test 2
Commercial Driver Licence Test 3
Commercial Driver Licence Test 4
Commercial Driver Licence Test 5
Commercial Driver Licence Test 6
Commercial Driver Licence Test 7
Commercial Driver Licence Test 8
