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Ontario Class A Commercial study materials
Ontario Class A Commercial study resources

Ontario Class A Commercial practice questions

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Question 1Commercial vehicle pre-trip inspection and air brake checks

During a pre-trip inspection of a tractor-trailer, you must check the service brake system for leakage. With the engine running and the system fully charged, what does the standard test require?

  1. Secure the vehicle against movement, stop the engine, release the spring brakes, and hold a full service-brake application for one minute while watching for pressure drop Correct answer.
  2. Releasing the parking brake and timing how long the tractor rolls on a level surface
  3. Five fanning applications with the engine off, watching for pressure rise
  4. One full application with the engine off, watching for the low-pressure warning to sound

Explanation

With the vehicle secured against movement and the system fully charged, stop the engine and release the spring brakes. Hold a full service-brake application and observe pressure loss over one minute after the initial application drop stabilizes. The engine must be off so the compressor cannot mask leakage.

Question 2Commercial vehicle pre-trip inspection and air brake checks

With the engine off and the air system fully charged, you fully apply the brakes and hold them for one minute. Which result indicates the system passes the static leakage check?

  1. Pressure rises slightly and then holds steady
  2. Pressure drops to zero and the spring brakes apply
  3. Pressure holds only if you keep pumping the pedal
  4. Pressure drops no more than the manufacturer's allowable limit for that period Correct answer.

Explanation

Static leakage is measured by holding a full brake application with the engine off and observing the gauge. The system passes when the pressure loss stays within the manufacturer's published limit for the test period. A large drop to zero would indicate a serious leak, not a pass.

Question 3Commercial vehicle pre-trip inspection and air brake checks

How do you test the low air pressure warning device during a pre-trip inspection?

  1. Turn the key on with the engine off and fan off pressure until the warning activates Correct answer.
  2. Rev the engine and watch for the warning to activate as pressure rises
  3. Apply the parking brake and listen for the warning as the spring brakes release
  4. Start the engine and watch for the warning to come on while the compressor builds pressure

Explanation

The warning device must activate before pressure falls below the regulated threshold, so the test is done with the engine off by fanning off the stored air until the warning sounds or lights. The compressor must not be running, or it will keep rebuilding pressure and prevent the warning from being reached.

Question 4Commercial vehicle pre-trip inspection and air brake checks

During a pre-trip inspection, the low pressure warning must activate before the air pressure drops below what value?

  1. 45 psi
  2. 80 psi
  3. 100 psi
  4. 60 psi Correct answer.

Explanation

Regulations require the low air pressure warning to activate before gauge pressure falls below 60 psi. This gives the driver time to stop safely before spring brakes apply automatically. Checking the warning against this threshold confirms the device is set correctly.

Question 5Commercial vehicle pre-trip inspection and air brake checks

What is the correct procedure for testing the tractor protection valve and trailer spring brakes during a pre-trip?

  1. With the vehicle secured and trailer spring brakes released, disconnect the charged trailer's supply line and confirm automatic brake application; then close the tractor's trailer supply valve, disconnect the service line, apply the service brakes and confirm no air escapes from that tractor line Correct answer.
  2. Drain all trailer air and confirm the trailer wheels roll freely
  3. Open the trailer supply valve fully and listen for continuous air escape
  4. Apply the tractor parking brake and check the trailer relay valve for leakage

Explanation

Two separate observations are required. Loss of supply air from a charged trailer with released spring brakes should cause those brakes to apply automatically. With the trailer supply valve closed and the service line disconnected, a service-brake application should produce no air escape from the tractor service line, demonstrating tractor protection.

Question 6Commercial vehicle pre-trip inspection and air brake checks

When checking slack adjusters on a vehicle with automatic slack adjusters, what should you do if you find excessive pushrod travel?

  1. Increase application pressure during the test until travel is within limits
  2. Manually adjust the slack adjuster and continue the trip
  3. Tag the vehicle out of service and have the fault repaired Correct answer.
  4. Ignore it because automatic slack adjusters always correct travel once moving

Explanation

Excessive pushrod travel means the brake system may not apply effectively, and automatic slack adjusters cannot be adjusted by hand as a substitute for repair. The vehicle should be placed out of service until the fault is corrected. Continuing to operate with excessive travel risks brake failure.

Question 7Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection, you check the air compressor governor cut-in and cut-out pressures. Which pair of values is typical for a properly functioning system?

  1. Cut-in around 45 psi and cut-out around 60 psi
  2. Cut-in around 120 psi and cut-out around 140 psi
  3. Cut-in and cut-out both at 90 psi
  4. Cut-in around 85 psi and cut-out around 100 to 125 psi Correct answer.

Explanation

The governor normally restarts compressor loading at roughly 85 psi and unloads it around 100 to 125 psi, depending on the manufacturer's specification. This range keeps adequate pressure for repeated brake applications. A system that cuts in far below or cuts out far above the specification needs repair.

Question 8Commercial vehicle pre-trip inspection and air brake checks

You are checking the alcohol evaporator or air dryer on a vehicle so equipped. What is the purpose of this component in the air brake system?

  1. To reduce system pressure at the governor
  2. To lubricate the brake chambers automatically
  3. To increase compressor output during heavy braking
  4. To remove moisture and contaminants from the compressed air before it reaches the tanks Correct answer.

Explanation

Air dryers and alcohol evaporators remove moisture from compressed air so it does not condense and freeze in lines or corrode components. Moisture in the system can cause brake failure in cold weather. Checking that the dryer is functioning is part of the pre-trip air system inspection.

Question 9Commercial vehicle pre-trip inspection and air brake checks

When draining air tanks during the pre-trip inspection, what should you observe to confirm the system is functioning correctly?

  1. A small amount of water and no oil, with the drain closing fully Correct answer.
  2. A steady stream of oil and water that does not stop
  3. A continuous flow of air that continues after the drain is closed
  4. No air escaping at any time from the drain cocks

Explanation

Draining the tanks should release a little moisture, but a heavy oil or water discharge indicates a compressor or dryer problem. If oil appears, the compressor may be passing oil into the system. The drain must close fully to prevent leakage.

Question 10Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection, you are checking the parking brake. With the system charged and the parking brake control pulled, what should happen?

  1. The spring brakes apply and hold the vehicle stationary Correct answer.
  2. The tractor protection valve opens to supply the trailer
  3. The service brakes apply and release automatically
  4. Air pressure rises in the spring brake chambers

Explanation

Applying the parking brake control exhausts air from the spring brake chambers, so the springs apply the brakes and hold the vehicle. This is a fail-safe design: loss of air applies the brakes. The check confirms the control and spring chambers function.

Question 11Commercial vehicle pre-trip inspection and air brake checks

A driver performs the pre-trip inspection and finds that the tractor protection valve does not close when the trailer supply line is disconnected. What is the correct action?

  1. Place the vehicle out of service until the valve is repaired Correct answer.
  2. Reduce speed and monitor the pressure gauge closely
  3. Disconnect the trailer and operate as a bobtail only
  4. Continue the trip but avoid using the trailer brakes

Explanation

A tractor protection valve that fails to close allows air to escape from the tractor when the trailer is disconnected, which can leave the tractor without braking air. The vehicle must be taken out of service until repaired. Operating with a known brake defect is unsafe and non-compliant.

Question 12Commercial vehicle pre-trip inspection and air brake checks

When inspecting the brake chambers and pushrods during the pre-trip, which condition requires the vehicle to be placed out of service?

  1. A pushrod that travels beyond the adjustment limit when the brake is applied Correct answer.
  2. A pushrod with a small amount of normal side play
  3. A chamber that holds air with no audible leak
  4. A light dust film on the exterior of the chamber

Explanation

Pushrod travel beyond the adjustment limit means the brakes cannot apply with sufficient force, so the vehicle must not be operated. This indicates worn or out-of-adjustment foundation brakes. Minor dust or slight play is normal and does not require removal from service.

Question 13Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection, how should you check the condition and adjustment of the service brakes on a trailer?

  1. Check the trailer lights and reflectors for operation
  2. Spin each wheel by hand and listen for bearing noise
  3. Measure the tire tread depth on each trailer wheel
  4. Apply the brakes and observe pushrod travel and chamber condition at each wheel Correct answer.

Explanation

The service brake check focuses on the foundation brakes: pushrod travel, chamber condition, slack adjusters, and lining condition at each wheel. Applying the brakes while observing these components confirms they function. Tire and light checks are separate parts of the inspection.

Question 14Commercial vehicle pre-trip inspection and air brake checks

You are performing the pre-trip inspection on a vehicle equipped with a spring brake system. What is the purpose of the spring brakes?

  1. To regulate compressor output
  2. To release the service brakes after each application
  3. To apply automatically if air pressure is lost Correct answer.
  4. To provide extra braking force during normal stops

Explanation

Spring brakes are held off by air pressure and apply by spring force when pressure is lost, providing a fail-safe parking and emergency brake. They are not the primary service brakes during normal driving. This design ensures the vehicle stops if the air system fails.

Question 15Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection, you notice that the air pressure builds very slowly from 85 psi to 100 psi with the engine at operating speed. What does this indicate?

  1. A correctly functioning governor that is limiting output
  2. A possible compressor or air system fault that should be repaired before operation Correct answer.
  3. Normal operation, since pressure always builds slowly
  4. That the low-pressure warning is set too high

Explanation

Slow pressure buildup indicates the compressor, governor, or system may be faulty, such as a weak compressor or a leak. The system should build pressure within the manufacturer's specified time. Slow buildup reduces the ability to recover pressure between brake applications.

Question 16Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection, you check the brake linings and drums. Which condition requires the vehicle to be placed out of service?

  1. A drum that is slightly warm to the touch
  2. A drum with a visible crack Correct answer.
  3. A drum with light surface rust
  4. Linings with a small amount of dust

Explanation

A cracked brake drum can fail under braking load and must be replaced before the vehicle is operated. Cracks compromise the structural integrity of the drum and the braking surface. Light rust, dust, and slight warmth are normal and not out-of-service conditions.

Question 17Commercial vehicle pre-trip inspection and air brake checks

When performing the pre-trip inspection, you check that the trailer emergency (breakaway) system functions. What should happen if the trailer supply line is pulled free?

  1. The trailer spring brakes apply and hold the trailer Correct answer.
  2. The trailer air tanks drain completely with no brake application
  3. The trailer brakes release and the wheels roll freely
  4. The tractor parking brake releases

Explanation

Pulling the supply line free simulates a breakaway, causing the trailer emergency system to apply the spring brakes and hold the trailer. This fail-safe function prevents a detached trailer from rolling away. The test confirms the emergency relay valve and spring chambers work.

Question 18Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection, you must verify that the air system reaches full pressure. What should the pressure gauge read when the system is fully charged and the compressor has cut out?

  1. Within the manufacturer's specified cut-out range, typically around 100 to 125 psi Correct answer.
  2. Any value below 80 psi
  3. Exactly 60 psi
  4. Exactly 45 psi

Explanation

A fully charged system should reach the governor cut-out pressure, typically around 100 to 125 psi depending on the manufacturer. This confirms the compressor can build adequate pressure. Readings far below this range indicate a fault.

Question 19Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection, you find that the low-pressure warning device does not activate when pressure falls below the required threshold. What is the correct action?

  1. Use the parking brake as a substitute for the warning
  2. Continue operating but check the gauge more often
  3. Reduce the governor cut-out pressure to compensate
  4. Place the vehicle out of service until the warning device is repaired Correct answer.

Explanation

The low-pressure warning is a required safety device that alerts the driver before spring brakes apply. If it does not function, the vehicle must be taken out of service until repaired. Frequent gauge checking does not replace the required warning.

Question 20Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection, you check the air lines and gladhands between the tractor and trailer. Which condition requires the vehicle to be placed out of service?

  1. A coupler that is securely latched
  2. A gladhand seal that is cracked or missing Correct answer.
  3. A gladhand that is clean and free of damage
  4. An air line that is properly supported

Explanation

A cracked or missing gladhand seal allows air to escape from the supply or service line, which can cause brake loss or drag. The vehicle must not be operated until the seal is replaced. Clean, supported lines and secure couplers are normal conditions.

Question 21Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection, you are checking the brake pedal free play and travel. What should you observe?

  1. The pedal should have the specified free play and should not travel excessively before the brakes apply Correct answer.
  2. The pedal should be firm with no free play at all
  3. The pedal should sink slowly to the floor while held
  4. The pedal should travel to the floor before any braking occurs

Explanation

Brake pedal free play and travel should match the manufacturer's specification, with the brakes applying before excessive travel. A pedal that sinks while held indicates an air or hydraulic leak. Too much free play means the brakes may not apply fully.

Question 22Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection, you must check the air compressor drive belt or coupling. Which condition requires the vehicle to be placed out of service?

  1. A belt that is frayed or missing Correct answer.
  2. A belt with light surface dust
  3. A coupling that is properly secured
  4. A belt with normal tension

Explanation

A frayed or missing compressor drive belt means the compressor cannot build air, which could leave the vehicle without braking pressure. The vehicle must not be operated until the belt is replaced. Normal tension, secure coupling, and light dust are acceptable.

Question 23Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection, how do you check that the trailer service brakes function when applied from the tractor?

  1. Drain the trailer air tanks and listen for the warning
  2. Apply the foot valve and have an assistant observe the trailer brake chambers for pushrod movement Correct answer.
  3. Disconnect the trailer supply line and check for air escape
  4. Release the parking brake and watch the trailer wheels for rotation

Explanation

The trailer service brakes are checked by applying the foot valve and confirming pushrod movement at the trailer chambers, which shows the service line and relay valve are working. An assistant is needed because the driver cannot see the trailer chambers from the cab. This confirms the trailer brakes respond to the tractor control.

Question 24Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection, you find that the air pressure in the system drops rapidly when the engine is off and the brakes are not applied. What does this indicate?

  1. A leak in the air system that must be repaired before operation Correct answer.
  2. Normal pressure loss from cooling
  3. A correctly functioning governor
  4. That the low-pressure warning is working as designed

Explanation

Rapid pressure loss with the brakes released and the engine off indicates a leak in the air system, such as a faulty valve, line, or fitting. The vehicle must not be operated until the leak is found and repaired. Normal systems hold pressure with only minor loss over time.

Question 25Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection, you check the brake lights and the trailer electrical connection. What is the correct way to confirm the brake lights operate?

  1. Have an assistant apply the brakes while you observe the rear lights Correct answer.
  2. Turn on the headlights and check the dash indicator
  3. Release the parking brake and watch for the light on the dash
  4. Rev the engine and listen for the brake light relay

Explanation

Brake lights are confirmed by having an assistant apply the brake pedal while you observe the rear of the vehicle and trailer. This verifies the switch, wiring, and bulbs all function. A dash indicator does not confirm the rear brake lights are working.

Question 26Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection of an air-braked tractor-trailer, you must confirm the air system's maximum pressure. With the system fully charged and the compressor at governor cut-out, the gauge should read at least what value?

  1. 150 psi
  2. 50 psi
  3. 100 psi Correct answer.
  4. 75 psi

Explanation

A fully charged air system must build to at least 100 psi before you begin the brake tests; this is the minimum reservoir pressure the system must reach and hold. If the compressor cuts out below this figure, the vehicle is not fit for service and must be repaired.

Question 27Commercial vehicle pre-trip inspection and air brake checks

You are checking the air pressure build-up rate during the pre-trip inspection. With the engine running at normal operating speed and the system below cut-out, what minimum rate should the compressor achieve?

  1. 50 psi per minute Correct answer.
  2. 10 psi per minute
  3. 5 psi per minute
  4. 85 psi per minute

Explanation

The compressor must raise reservoir pressure at a rate of at least 50 psi per minute at normal governed engine speed. A slower build-up means a weak compressor, a leak, or a slipping drive and the vehicle must be taken out of service pending repair.

Question 28Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection you perform the static leak test on the air system. With the engine off, the system fully charged, and the brakes released, the pressure should drop no more than what amount over one minute?

  1. 1 psi
  2. 3 psi Correct answer.
  3. 6 psi
  4. 10 psi

Explanation

With the engine stopped, the system charged, and the brakes released, leakage must not exceed 3 psi in one minute. A larger drop reveals a leak somewhere in the system that must be located and repaired before the trip.

Question 29Commercial vehicle pre-trip inspection and air brake checks

You apply and hold the service brake fully during the pre-trip static leak test with the engine off and the system charged. What is the maximum allowable pressure loss in one minute with the brakes applied?

  1. 4 psi Correct answer.
  2. 6 psi
  3. 3 psi
  4. 15 psi

Explanation

When the service brake is fully applied and held with the engine off, leakage must not exceed 4 psi in one minute. This applied-brake test uses a slightly higher limit than the released-brake test because the applied system contains more charged volume.

Question 30Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection you check the low air pressure warning device. At approximately what pressure must the warning activate as pressure falls?

  1. 60 psi Correct answer.
  2. 45 psi
  3. 30 psi
  4. 90 psi

Explanation

The low-pressure warning buzzer and light must activate before pressure drops below 60 psi, giving the driver time to react before braking performance is compromised. You verify this by reducing pressure with the engine off and watching for the warning to come on at or above that threshold.

Question 31Commercial vehicle pre-trip inspection and air brake checks

You are testing the tractor protection valve during the pre-trip. With the trailer supply line charged and the parking brake released, you make a trailer breakaway by disconnecting the supply line. What should happen?

  1. The trailer supply line stays open and pressure holds steady
  2. The tractor protection valve closes and the trailer emergency brakes apply Correct answer.
  3. The trailer service brakes release and pressure bleeds slowly
  4. Only the tractor service brakes apply automatically

Explanation

When the trailer supply line is broken or disconnected, the tractor protection valve must close to protect tractor air and the trailer emergency brakes must apply automatically. This confirms the breakaway protection works as designed.

Question 32Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection you drain the supply reservoir and observe the gauge. What should happen to the pressure in the other reservoirs as the supply tank drains?

  1. Pressure in all reservoirs should fall to zero immediately
  2. Pressure in the other reservoirs should remain unaffected
  3. The compressor should start and hold pressure steady
  4. The pressure in the other reservoirs should drop as well Correct answer.

Explanation

The reservoirs are interconnected through one-way check valves, so draining one tank should not empty the others, but the system pressure will fall as air is released. A check valve that lets a single tank drain the entire system is a defect requiring repair.

Question 33Commercial vehicle pre-trip inspection and air brake checks

You are checking the slack adjusters on a vehicle with manual slack adjusters during the pre-trip. With the brakes released, the pushrod should have no more than what amount of free travel?

  1. About 1 inch
  2. About 1/2 inch Correct answer.
  3. About 3 inches
  4. About 2 inches

Explanation

Manual slack adjusters should allow no more than about 1/2 inch of pushrod free travel with the brakes released. Excessive free travel means the brakes are out of adjustment and must be corrected before the vehicle is driven.

Question 34Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection you check the brake pedal. Which observation indicates the service brake system is functioning correctly?

  1. The pedal travels more than halfway before resistance
  2. The pedal feels firm and holds its position when held Correct answer.
  3. The pedal sinks slowly to the floor when held
  4. The pedal pulses strongly at all times without application

Explanation

A properly functioning service brake gives a firm pedal that holds its position while applied; a sinking pedal points to an air or hydraulic leak. Excessive travel or a spongy feel means the system needs repair before use.

Question 35Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection you examine the brake chambers and pushrods. Which condition requires the vehicle to be placed out of service?

  1. A light film of dust on the chamber exterior
  2. A pushrod that returns fully when the brake is released
  3. A chamber with a slightly faded manufacturer label
  4. A cracked or dented brake chamber housing Correct answer.

Explanation

A cracked, dented, or otherwise damaged brake chamber housing is a defect that can cause sudden brake failure and requires the vehicle to be placed out of service. Cosmetic conditions such as dust or a faded label do not affect braking performance.

Question 36Commercial vehicle pre-trip inspection and air brake checks

You are checking the spring brakes during the pre-trip. With the system fully charged, you release the parking brake control and observe the pushrods. What should happen?

  1. The pushrods should extend and stay extended
  2. The pushrods should extend only on the trailer axle
  3. The pushrods should retract and the wheels should turn freely Correct answer.
  4. The pushrods should stay in the applied position

Explanation

With full air pressure applied, the spring brakes release and the pushrods retract, allowing the wheels to turn freely. If the pushrods do not retract, the spring brake system or its air supply has failed and the vehicle must not be driven.

Question 37Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection you check the brake lining thickness on an air-braked vehicle. Which condition requires the vehicle to be placed out of service?

  1. A lining with a slightly uneven wear pattern
  2. A lining with light surface glazing
  3. A drum with a light dust coating
  4. A lining worn to the rivet heads or bonded material worn thin Correct answer.

Explanation

A lining worn down to the rivets or with bonded material worn below the minimum thickness cannot provide adequate braking and requires the vehicle to be placed out of service. Light glazing, dust, or minor uneven wear does not by itself make the vehicle unfit.

Question 38Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection you check the alcohol evaporator or air dryer. What is its purpose in the air system?

  1. It boosts air pressure to the trailer
  2. It removes moisture and contaminants from the air supply Correct answer.
  3. It lubricates the brake chambers automatically
  4. It increases the compressor's cut-out pressure

Explanation

An alcohol evaporator or air dryer removes moisture and contaminants from the compressed air so that water does not collect in the reservoirs and freeze or corrode the system. It does not change pressure settings or lubricate components.

Question 39Commercial vehicle pre-trip inspection and air brake checks

During the pre-trip inspection you check the gladhands and air lines between tractor and trailer. Which condition requires the vehicle to be placed out of service?

  1. A gladhand that is cracked or missing its seal Correct answer.
  2. A coupler seal that is slightly discolored
  3. An air line with a small amount of surface dust
  4. A gladhand with a light scuff on the outer body

Explanation

A cracked gladhand or one missing its rubber seal will leak air and can cause the trailer brakes to fail or drag, so the vehicle must be placed out of service. Cosmetic scuffs, discoloration, or dust do not affect the air seal.

Question 40Commercial vehicle pre-trip inspection and air brake checks

You are performing the pre-trip inspection and must verify the trailer service brakes apply from the tractor. Which procedure confirms this correctly?

  1. Drain the trailer reservoir and watch the gauge fall
  2. Charge the system, release the parking brake, and apply the foot brake while a helper watches the trailer pushrods Correct answer.
  3. Release the tractor parking brake only and watch the trailer wheels
  4. Open the trailer supply line and listen for air escaping

Explanation

To confirm trailer service brakes, charge the system fully, release the parking brake, and apply the foot brake while a helper observes the trailer pushrods extend. The trailer brakes must apply and release with the tractor service brake.

Question 41Hours of service and daily log requirements

Under Ontario hours-of-service rules, after how many consecutive hours on duty must a driver of a commercial motor vehicle take at least 8 consecutive hours off duty?

  1. 11 hours
  2. 16 hours
  3. 14 hours Correct answer.
  4. 13 hours

Explanation

Ontario Regulation 555/06 requires a driver to take at least 8 consecutive hours off duty after accumulating 14 hours on duty in a day. The 14-hour limit is a maximum elapsed on-duty window, not driving time, and it resets only after the required off-duty period.

Question 42Hours of service and daily log requirements

A driver operating under Ontario hours-of-service rules has been on duty for 13 hours and has driven 10 hours. What is the maximum additional driving time available before a daily reset is required?

  1. 0 hours
  2. 1 hour Correct answer.
  3. 2 hours
  4. 3 hours

Explanation

The daily driving limit is 13 hours, so with 10 hours already driven the driver has 3 hours of driving remaining. However, the 14-hour on-duty window caps total elapsed duty, and only 1 hour of that window remains, so only 1 hour of driving is available. The most restrictive limit governs.

Question 43Hours of service and daily log requirements

What is the minimum number of consecutive hours off duty that a driver must take in each day under Ontario hours-of-service rules?

  1. 11 hours
  2. 10 hours
  3. 8 hours Correct answer.
  4. 13 hours

Explanation

Ontario requires at least 8 consecutive hours off duty in each day, and this off-duty period is what resets the daily on-duty and driving limits. The 8 hours may be taken in a sleeper berth or off duty, provided it is consecutive.

Question 44Hours of service and daily log requirements

A driver's daily log shows 9 hours driving, 3 hours on duty not driving, and 2 hours off duty within a 14-hour window. What total on-duty time must be recorded for that day?

  1. 14 hours
  2. 11 hours
  3. 9 hours
  4. 12 hours Correct answer.

Explanation

On-duty time includes both driving time and on-duty-not-driving time, so 9 plus 3 equals 12 hours on duty. Off-duty time is recorded separately and is not counted toward the on-duty total.

Question 45Hours of service and daily log requirements

How many hours of driving are permitted in a day before the driver must stop driving and take the required off-duty period?

  1. 14 hours
  2. 12 hours
  3. 11 hours
  4. 13 hours Correct answer.

Explanation

Ontario sets the daily driving limit at 13 hours. Once 13 hours of driving have accumulated in a day, the driver cannot drive again until an 8-hour off-duty period resets the daily limits.

Question 46Hours of service and daily log requirements

In a cycle of 7 consecutive days, what is the maximum total on-duty time a driver may accumulate under Ontario hours-of-service rules?

  1. 60 hours
  2. 120 hours
  3. 70 hours Correct answer.
  4. 77 hours

Explanation

A driver operating on the 7-day cycle may accumulate no more than 70 hours on duty in any 7 consecutive days. The 60-hour figure applies to the 6-day cycle option. Exceeding the cycle limit requires the driver to take the prescribed reset.

Question 47Hours of service and daily log requirements

A driver on the 6-day cycle reaches 60 hours on duty. What must occur before the driver may drive again under Ontario rules?

  1. Take 24 consecutive hours off duty Correct answer.
  2. Switch to the 7-day cycle immediately
  3. Take 8 consecutive hours off duty
  4. Take 36 consecutive hours off duty

Explanation

When the 6-day cycle limit of 60 hours is reached, the driver must take at least 24 consecutive hours off duty to reset the cycle. An 8-hour break resets only the daily limits, not the cycle total.

Question 48Hours of service and daily log requirements

Which item is required to appear on a completed daily log for a commercial driver in Ontario?

  1. The driver's signature certifying the log is accurate Correct answer.
  2. The name of the shipper for each load
  3. The driver's home address and phone number
  4. The total distance travelled in kilometres

Explanation

A daily log must be signed by the driver to certify that the entries are accurate and complete. The log also records the date, vehicle unit numbers, duty status changes, and total hours, but the driver's certification signature is a mandatory element.

Question 49Hours of service and daily log requirements

A driver changes from on duty not driving to driving status at 10:15. How must this change be recorded on the daily log?

  1. A single total for the day written at the bottom
  2. A line drawn to the driving row at 10:15 with the location noted Correct answer.
  3. An entry made at the end of the shift from memory
  4. A note in the remarks section only

Explanation

Each change of duty status must be shown on the graph grid at the exact time it occurs, with the location recorded. This creates a continuous, verifiable record of the driver's day rather than a summary.

Question 50Hours of service and daily log requirements

A driver is dispatched at 06:00, drives until 09:00, and then waits 2 hours for a load while remaining on duty. At what time does the driver's 14-hour on-duty window expire?

  1. 17:00
  2. 18:00
  3. 20:00 Correct answer.
  4. 19:00

Explanation

The 14-hour window begins when the driver comes on duty at 06:00 and runs continuously, so it expires at 20:00. Waiting time counts as on duty and does not pause the window.