DZ test questions: 50 printable practice questions with answers

50 original Ontario Class D (DZ) practice questions on one printable sheet, with a separate answer key, an explanation and the handbook chapter for every answer. Print it or save it as a PDF. Free; not the official test.

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This page puts 50 original practice questions for the Ontario Class D (DZ) Truck Knowledge Test on one sheet you can print or save as a PDF. They are drawn evenly from our 14 topics (class d licence and requirements, weights, cvor and documents, daily inspection and defects, brake checks: hydraulic and air, cargo securement and loads, hours of service and logs, engine, gears and braking technique and off-track, turns, clearances and backing, among others), so one sitting covers the whole test, not just the easy chapters.

The answer key starts on a new page after the last question. Each answer has a short explanation and the chapter of the The Official MTO Truck Handbook it comes from, so you can check the rule in the official source instead of memorising our wording. These are not the official test questions: the Ontario Ministry of Transportation (MTO) does not publish its question bank. When the sheet feels easy, sit a timed mock exam of 40 questions (you need 32 correct to pass our mock).

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1.What should you do if you think a fire is caused by a short circuit?
1. Open the hood and leave it
2. Pour water on the wiring
3. Remove the battery cables
4. Start the engine to clear it
2.A doctor reports a DZ driver's heart condition. What can follow?
1. A fine for the doctor
2. Automatic upgrade to Class A
3. Nothing; such reports are ignored
4. A suspension until cleared
3.What must a Class D holder add to drive a truck fitted with air brakes?
1. A T endorsement
2. An R condition
3. A Q condition
4. A Z endorsement
4.After the warm-up idle, how should you start driving?
1. At full power to finish warming
2. Gently, without hard throttle
3. With the engine brake on
4. In neutral down a hill
5.Instead of an "OVERSIZE LOAD" sign, which other sign may be used?
1. A slow-moving vehicle triangle
2. A "D" sign
3. An LCV placard
4. A dangerous goods placard
6.How can brakes cause a truck fire?
1. By being painted the wrong colour
2. By overheating
3. By using brand-new brake linings
4. By being washed too often
7.Whose name must appear on a driver's daily log besides their own?
1. The insurance broker's name
2. The receiver's warehouse manager
3. The truck's manufacturer
4. The operator and co-drivers
8.When is pumping (fanning) the brakes useful?
1. On dry pavement
2. When parked on a hill
3. On long downgrades
4. On slippery pavement
9.Your truck's rear wheels keep riding up on corner curbs. What should you do?
1. Use the sidewalk on purpose
2. Turn faster to finish more quickly
3. Go further in before turning
4. Turn the wheel sooner and sharper
10.Why shouldn't you drive on or block the shoulder of a freeway in traffic?
1. It sets off the speed cameras
2. It is reserved for city buses
3. Emergency vehicles may use it
4. It wears out your tires faster
11.Two solid lines curve around a bridge pier on the road. What do they do?
1. Show a school crossing ahead
2. Steer traffic around it
3. Mark a lane for trucks only
4. Mark a no-parking zone
12.When the backing manoeuvre is finished, what must you do?
1. Get out and measure the gap
2. Leave the engine in reverse
3. Drive forward to the start line
4. Secure it and tell the examiner
13.You refuse to unload part of an overweight load when ordered. What fine range applies?
1. $50 to $500
2. $25,000 to $50,000
3. $1,000 to $2,000
4. $200 to $20,000
14.With brakes held applied for one minute, what air drop is a major defect on a Class D truck?
1. More than 1 psi
2. More than 5 psi
3. More than 8 psi
4. More than 3 psi
15.How far to the right can a snow plow's wing extend?
1. Up to 3 m
2. Up to 5 m
3. Up to 10 m
4. Up to 1 m
16.A DZ driver takes a cold medicine that impairs them. Can they face criminal charges?
1. No, it is a legal medicine
2. Yes, any drug counts
3. Only if they caused a crash
4. Only if the label warns of it
17.How old must you be to apply for a Class D licence?
1. At least 21
2. At least 16
3. At least 18
4. At least 17
18.A used truck's brand reads "None". What does that tell you?
1. It was rebuilt after a crash
2. It has never been damaged
3. It is unsafe to drive
4. No Ontario brand applied
19.What colour are the flags for an oversize load?
1. Any bright colour
2. Yellow or green
3. Bright red or orange
4. Blue or white
20.You hear an air leak during your circle check. What should you do next?
1. Ignore it if pressure is normal
2. Drive and recheck tomorrow
3. Do the air-loss rate test
4. Add an alcohol evaporator
21.A driver uses a pick-up with a 5,500 kg MGVWR for personal errands. Do hours-of-service rules apply?
1. Yes, always
2. Only over 160 km
3. No, it is exempt
4. Only on weekends
22.On some trucks, what may you need to do while releasing the clutch to move off?
1. Add a little throttle
2. Turn off the engine brake switch
3. Press the service brake hard
4. Shift back into neutral
23.Turning left at an island, what can hit a sign post if you do not watch it?
1. Your roof lights
2. The rear of your truck
3. Your front bumper only
4. Your side mirror only
24.A second conviction within five years for not moving over for a stopped emergency vehicle brings what fine range?
1. $400 to $2,000
2. $100 to $500
3. $1,000 to $4,000
4. $5,000 to $10,000
25.What do EDR signs along a road mark?
1. Electric vehicle charging points
2. Express delivery truck routes
3. A detour around a highway closure
4. Exits reserved for dump trucks
26.For each randomly selected item, what must you do besides demonstrating the check?
1. Explain the defect and your action
2. Photograph it for the examiner
3. Repair it on the spot
4. Sign a repair order for it
27.Which vehicle is NOT a motor vehicle under the handbook definition?
1. A delivery truck
2. A moped
3. A farm tractor
4. A motorcycle
28.How does the inspection schedule divide defects?
1. Into legal and illegal
2. Into red and green
3. Into minor and major
4. Into front and rear
29.Your truck has lane-keeping assist. Can you still be charged with careless driving?
1. Yes, you must stay in control
2. No, the system is responsible
3. Only on city streets
4. Only at night
30.Who should you ask about a new prescription's effect on driving?
1. Your dispatcher
2. Another truck driver
3. Your doctor or pharmacist
4. The police
31.With Class D, what is the heaviest trailer you may tow behind your truck?
1. 11,000 kg
2. 2,000 kg
3. 4,600 kg
4. Any weight
32.How should you start a diesel truck to save fuel?
1. Zero throttle, no-throttle gear
2. Pump the throttle three times
3. Start it in the top gear
4. Hold the throttle wide open
33.You loaded at 7 a.m. When must you first stop to check the load?
1. At the end of the day
2. Within the first 80 km
3. After 3 hours or 500 km
4. Only if you hear a noise
34.At what air pressure should pushrod stroke be measured?
1. 90 to 100 psi
2. Any pressure at all
3. 40 to 50 psi
4. 120 to 130 psi
35.Under what condition may a driver switch from one cycle to the other?
1. Any day at midnight
2. Only with police approval
3. Only by starting a new cycle
4. Only after an inspection
36.What happens if you shift without using the clutch?
1. The brakes adjust themselves
2. Fuel economy improves
3. Transmission gear teeth wear down
4. The engine runs cooler
37.Your truck has a back-up alarm. Does it remove your responsibility when reversing?
1. Only with a guide present
2. Only in daylight
3. Yes, the alarm warns everyone
4. No, the driver stays responsible
38.Following too closely behind a small car in a truck can cause what?
1. Nothing, if you stay alert
2. The driver may feel intimidated
3. A shorter stopping distance
4. Better fuel economy for both
39.The light turns yellow as you approach. What should you do?
1. Speed up to clear it
2. Always stop instantly
3. Sound the horn and go
4. Stop if you can do so safely
40.On a Class D road test you make errors on two daily inspection items. What is the result?
1. You pass with a warning
2. You redo one item
3. You lose 2 of 30 points
4. You do not pass
41.Which of these is a commercial motor vehicle under the handbook definition?
1. A farm tractor working in a field
2. A car with a roof rack for luggage
3. A truck with a fixed delivery body
4. A motorized snow vehicle on a trail
42.Which national standard sets the annual inspection requirements?
1. CSA Standard B620
2. NSC Standard 10
3. ISO Standard 14001
4. NSC Standard 11, Part B
43.You become stranded in a severe snowstorm. What should you do?
1. Sleep with all windows sealed tight
2. Stay with the truck
3. Walk to the nearest town for help
4. Run the engine nonstop for heat
44.What can happen if you build up too many demerit points?
1. Your truck is impounded
2. Nothing at all happens
3. Your CVOR is cancelled
4. Your licence can be suspended
45.A Class G holder adds an RV endorsement. Up to what RV weight may they drive?
1. Any weight
2. 4,600 kg
3. 14,000 kg
4. 11,000 kg
46.How should your tires be inflated for best fuel economy?
1. As low as safely possible
2. 10 psi below the maximum
3. As the tire maker says
4. Based on the load only
47.It is foggy at noon and your load overhangs 2 m. What marking is required?
1. An amber flasher
2. Only a red flag
3. No marking
4. A red light
48.What can happen to the operator if a truck is found with out-of-adjustment brakes?
1. Their insurance is cancelled at once
2. Nothing; only the driver is fined
3. They receive a free inspection
4. Their CVOR certificate may be suspended
49.After 8 hours off, you start at 5 a.m. After what time may you not drive, regardless of driving hours?
1. 7 p.m. (14 hours later)
2. 9 p.m. (16 hours later)
3. 5 a.m. next day
4. 6 p.m. (13 hours later)
50.Which gauge should you check right after starting the engine?
1. Trip odometer
2. Fuel economy
3. Outside temperature
4. Oil pressure

Answer key with explanations

1. C — Remove the battery cables
If the fire is thought to be from a short circuit, remove the battery cables, using the right extinguisher for the fire class.
Night, weather and emergencies · Based on: MTO Truck Handbook (online edition, 2026), Ch. 3 Safe and responsible driving, Dealing with emergencies — Fire precautions
2. D — A suspension until cleared
The licence may be suspended until new medical evidence shows the condition does not pose a safety risk; reports are not given to anyone else.
Keeping your Class D licence · Based on: MTO Truck Handbook (online edition, 2026), Ch. 5 Keeping your licence, Other ways to lose your licence — Medical suspension
3. D — A Z endorsement
A Z air brake endorsement is required on a licence to operate any air-brake-equipped motor vehicle.
Class D licence and requirements · Based on: MTO Truck Handbook (online edition, 2026), Ch. 1 Getting your licence, Getting your licence — Licence classification chart
4. B — Gently, without hard throttle
After the initial idle, warm up the vehicle by driving easily rather than pushing the throttle hard.
Fuel-efficient driving, HOV and branding · Based on: MTO Truck Handbook (online edition, 2026), Ch. 7 Additional information, Driving efficiently — Starting and warm-up
5. B — A "D" sign
Vehicles and loads must display either an OVERSIZE LOAD sign or a "D" sign on the front of the vehicle and rear of the load.
Cargo securement and loads · Based on: MTO Truck Handbook (online edition, 2026), Ch. 1 Getting your licence, Signs — Oversize load sign
6. B — By overheating
Overheated brakes, either from misuse or maladjustment, are a common cause of truck fires; check hub temperatures whenever you check tires.
Brake checks: hydraulic and air · Based on: MTO Truck Handbook (online edition, 2026), Ch. 2 Driving, Dealing with emergencies — Brake heat
7. D — The operator and co-drivers
The daily log must include the operator's name and the names of the driver's co-drivers, if any.
Hours of service and logs · Based on: MTO Truck Handbook (online edition, 2026), Ch. 1 Getting your licence, Hours of service — Daily log requirement
8. D — On slippery pavement
Fanning the brakes gives better control and a shorter stop only on slippery pavement; on dry pavement it just wastes air.
Engine, gears and braking technique · Based on: MTO Truck Handbook (online edition, 2026), Ch. 2 Driving, Use of brakes
9. C — Go further in before turning
Lead the turning arc according to your off-track and proceed well into the intersection before beginning the turn.
Off-track, turns, clearances and backing · Based on: MTO Truck Handbook (online edition, 2026), Ch. 2 Driving, Right turns
10. C — Emergency vehicles may use it
Emergency vehicles will use the shoulder if all lanes are blocked, so don't drive on it or block it.
Driver conduct and sharing the road · Based on: MTO Truck Handbook (online edition, 2026), Ch. 3 Safe and responsible driving, Dealing with particular situations — Emergency vehicles
11. B — Steer traffic around it
Two solid lines guide traffic away from fixed objects such as bridge piers or concrete islands, which also carry yellow and black markings.
Signs, signals and markings · Based on: MTO Truck Handbook (online edition, 2026), Ch. 4 Traffic signs and lights, Pavement markings
12. D — Secure it and tell the examiner
Finish as straight as possible within the cones, secure the vehicle and inform the examiner you are finished.
Class D road test · Based on: MTO Truck Handbook (online edition, 2026), Ch. 6 Road test, Backing skills test
13. D — $200 to $20,000
Refusing to redistribute or remove part of a load, or obstructing a weighing, brings a fine of $200 to $20,000.
Weights, CVOR and documents · Based on: MTO Truck Handbook (online edition, 2026), Ch. 1 Getting your licence, Vehicle safety, maintenance and daily inspections — Inspection stations
14. D — More than 3 psi
For Class D, an air pressure drop of more than 21 kPa (3 psi) in one minute is a major defect; for Class A combinations it is 4 psi.
Daily inspection and defects · Based on: MTO Truck Handbook (online edition, 2026), Ch. 1 Getting your licence, Daily inspection test — Straight truck defect limits
15. A — Up to 3 m
Some snow plows have a wing that extends as far as three metres to the right of the vehicle.
Night, weather and emergencies · Based on: MTO Truck Handbook (online edition, 2026), Ch. 3 Safe and responsible driving, Driving at night and in bad weather — Snow plows
16. B — Yes, any drug counts
Impairment by any substance, including prescription or over-the-counter drugs, can lead to severe consequences including criminal charges.
Keeping your Class D licence · Based on: MTO Truck Handbook (online edition, 2026), Ch. 5 Keeping your licence, Other ways to lose your licence — Zero tolerance
17. C — At least 18
An applicant for a Class A or D licence must be at least 18 years old.
Class D licence and requirements · Based on: MTO Truck Handbook (online edition, 2026), Ch. 1 Getting your licence, A and D licence classes and requirements — Requirements
18. D — No Ontario brand applied
A brand of None does not mean the vehicle was never damaged or never branded elsewhere; it only means no Ontario brand has been applied.
Fuel-efficient driving, HOV and branding · Based on: MTO Truck Handbook (online edition, 2026), Ch. 7 Additional information, Additional information — Mandatory Vehicle Branding Program
19. C — Bright red or orange
Oversize loads must have bright red or orange flags at least 40 cm square at the extremities, kept clean.
Cargo securement and loads · Based on: MTO Truck Handbook (online edition, 2026), Ch. 1 Getting your licence, Signs — Oversize load sign
20. C — Do the air-loss rate test
Any audible air leak is a minor defect, and on hearing one you should conduct the air-loss rate test.
Brake checks: hydraulic and air · Based on: MTO Truck Handbook (online edition, 2026), Ch. 2 Driving, Daily inspection test — Air brake items
21. C — No, it is exempt
Pick-up trucks used for personal purposes with an MGVWR of 6,000 kg or less are exempt from hours-of-service rules.
Hours of service and logs · Based on: MTO Truck Handbook (online edition, 2026), Ch. 1 Getting your licence, Hours of service — Exemptions
22. A — Add a little throttle
When starting to move, release the clutch gradually while releasing the parking brake; on some vehicles the engine must be speeded up gradually to prevent stalling.
Engine, gears and braking technique · Based on: MTO Truck Handbook (online edition, 2026), Ch. 2 Driving, Putting vehicle in motion
23. B — The rear of your truck
Allow for off-track on a left turn; monitor the rear wheels' path in the left mirror so they do not hit a vehicle or a sign on an island.
Off-track, turns, clearances and backing · Based on: MTO Truck Handbook (online edition, 2026), Ch. 2 Driving, Left turns
24. C — $1,000 to $4,000
A first offence brings $400 to $2,000; a subsequent offence within five years brings $1,000 to $4,000, demerit points and a possible suspension of up to two years.
Driver conduct and sharing the road · Based on: MTO Truck Handbook (online edition, 2026), Ch. 3 Safe and responsible driving, Dealing with particular situations — Stopped emergency vehicle
25. C — A detour around a highway closure
EDR markers guide drivers along an alternative route when police close a provincial highway, and back onto it.
Signs, signals and markings · Based on: MTO Truck Handbook (online edition, 2026), Ch. 4 Traffic signs and lights, Signs — Other signs
26. A — Explain the defect and your action
Demonstrate and describe the inspection, explain what the defects would be and describe what action you would take for a minor or major defect.
Class D road test · Based on: MTO Truck Handbook (online edition, 2026), Ch. 6 Road test, Road test — Class D components
27. C — A farm tractor
Motor vehicles exclude farm tractors, road-building machines, motorized snow vehicles, power-assisted bikes and rail cars.
Weights, CVOR and documents · Based on: MTO Truck Handbook (online edition, 2026), Ch. 1 Getting your licence, Getting your licence — Definitions
28. C — Into minor and major
The schedule lists systems to inspect and divides defects into two categories: major and minor.
Daily inspection and defects · Based on: MTO Truck Handbook (online edition, 2026), Ch. 1 Getting your licence, Daily trip inspection — classes A and D
29. A — Yes, you must stay in control
Even with driver-assistance features, you can be charged with distracted, careless or dangerous driving; you must monitor and be ready to take control.
Night, weather and emergencies · Based on: MTO Truck Handbook (online edition, 2026), Ch. 3 Safe and responsible driving, Dealing with particular situations — Distracted driving
30. C — Your doctor or pharmacist
Ask your doctor or pharmacist before you drive; drugs and alcohol together can have dangerous effects even several days later.
Keeping your Class D licence · Based on: MTO Truck Handbook (online edition, 2026), Ch. 5 Keeping your licence, Other ways to lose your licence — Drugs
31. C — 4,600 kg
Class D allows a truck or combination over 11,000 kg as long as the towed vehicle is not over 4,600 kg (10,000 lb).
Class D licence and requirements · Based on: MTO Truck Handbook (online edition, 2026), Ch. 1 Getting your licence, A and D licence classes and requirements — Class D
32. A — Zero throttle, no-throttle gear
When starting, use zero throttle and a gear that does not need any; pumping the throttle wastes fuel and can damage cylinder walls.
Fuel-efficient driving, HOV and branding · Based on: MTO Truck Handbook (online edition, 2026), Ch. 7 Additional information, Driving efficiently — Starting and warm-up
33. B — Within the first 80 km
The cargo must be inspected before driving and re-checked not more than 80 km from where it was loaded.
Cargo securement and loads · Based on: MTO Truck Handbook (online edition, 2026), Ch. 1 Getting your licence, Vehicle safety, maintenance and daily inspections — Cargo securement
34. A — 90 to 100 psi
Raise or lower pressure until both gauges show 90 to 100 psi, shut off the engine and hold the brakes fully applied to measure stroke.
Brake checks: hydraulic and air · Based on: MTO Truck Handbook (online edition, 2026), Ch. 2 Driving, Daily inspection test — Air brake items
35. C — Only by starting a new cycle
A driver may only switch cycles by starting a new one: 36 consecutive hours off on the 7-day cycle, 72 on the 14-day cycle.
Hours of service and logs · Based on: MTO Truck Handbook (online edition, 2026), Ch. 1 Getting your licence, Hours of service — Cycle reset
36. C — Transmission gear teeth wear down
Always use the clutch; failing to do so can wear down the gear teeth in the transmission.
Engine, gears and braking technique · Based on: MTO Truck Handbook (online edition, 2026), Ch. 2 Driving, Driving efficiently
37. D — No, the driver stays responsible
Back-up alarm devices do not relieve the driver's responsibility when reversing; use a guide and check the area.
Off-track, turns, clearances and backing · Based on: MTO Truck Handbook (online edition, 2026), Ch. 2 Driving, Guide
38. B — The driver may feel intimidated
Following closely is dangerous because you lack room to stop, and a large vehicle looming behind may intimidate drivers of small vehicles.
Driver conduct and sharing the road · Based on: MTO Truck Handbook (online edition, 2026), Ch. 3 Safe and responsible driving, Driver conduct
39. D — Stop if you can do so safely
A yellow light means the red is about to appear; stop if you can do so safely, otherwise go with caution.
Signs, signals and markings · Based on: MTO Truck Handbook (online edition, 2026), Ch. 4 Traffic signs and lights, Traffic lights — Yellow light
40. D — You do not pass
In the daily inspection test you are allowed to make errors on one item only.
Class D road test · Based on: MTO Truck Handbook (online edition, 2026), Ch. 6 Road test, Road test — Passing standard
41. C — A truck with a fixed delivery body
A commercial motor vehicle has a permanently attached truck or delivery body; ambulances, hearses, buses and tractors used to haul loads also count.
Weights, CVOR and documents · Based on: MTO Truck Handbook (online edition, 2026), Ch. 1 Getting your licence, Getting your licence — Definitions
42. D — NSC Standard 11, Part B
Annual inspections check compliance with National Safety Code Standard 11, Part B, adopted under the Highway Traffic Act.
Daily inspection and defects · Based on: MTO Truck Handbook (online edition, 2026), Ch. 1 Getting your licence, Vehicle safety, maintenance and daily inspections — Annual inspection
43. B — Stay with the truck
Stay with your vehicle for warmth and safety, open a window slightly for ventilation, run the motor sparingly and use your flashers.
Night, weather and emergencies · Based on: MTO Truck Handbook (online edition, 2026), Ch. 3 Safe and responsible driving, Driving at night and in bad weather — Whiteouts
44. D — Your licence can be suspended
Demerit points stay on your record for two years; if you accumulate too many, your licence can be suspended.
Keeping your Class D licence · Based on: MTO Truck Handbook (online edition, 2026), Ch. 5 Keeping your licence, Keeping your licence — Demerit point system
45. C — 14,000 kg
A full Class E, F or G licence with an RV endorsement covers recreational vehicles up to 14,000 kg.
Class D licence and requirements · Based on: MTO Truck Handbook (online edition, 2026), Ch. 1 Getting your licence, Get a truck driver's licence (ontario.ca) — RV rules since July 2025
46. C — As the tire maker says
Inflate tires to the manufacturer's recommendation; about 1 per cent of fuel is wasted for every 10 psi of under-inflation.
Fuel-efficient driving, HOV and branding · Based on: MTO Truck Handbook (online edition, 2026), Ch. 7 Additional information, Driving efficiently — On the road
47. D — A red light
Lights are required in poor light conditions as well as from half an hour before sunset to half an hour after sunrise, so the overhang needs a red light.
Cargo securement and loads · Based on: MTO Truck Handbook (online edition, 2026), Ch. 1 Getting your licence, Vehicle safety, maintenance and daily inspections — Rear overhang
48. D — Their CVOR certificate may be suspended
Out-of-adjustment air brakes can get the vehicle detained, and the operator's CVOR certificate may be cancelled or suspended.
Brake checks: hydraulic and air · Based on: MTO Truck Handbook (online edition, 2026), Ch. 2 Driving, Daily trip inspection — Brake adjustment
49. B — 9 p.m. (16 hours later)
After at least eight hours off duty, a driver cannot drive once 16 hours have elapsed, in addition to the 13-hour driving and 14-hour on-duty limits.
Hours of service and logs · Based on: MTO Truck Handbook (online edition, 2026), Ch. 1 Getting your licence, Hours of service — Mandatory off-duty time
50. D — Oil pressure
Check the gauge for adequate engine oil pressure after starting; on air-brake trucks also check air pressure.
Engine, gears and braking technique · Based on: MTO Truck Handbook (online edition, 2026), Ch. 2 Driving, Starting the engine

Original practice questions by Canada Exam Prep, written from the official handbook. Not official test questions. Free to print for personal study.

FAQ

Ontario Class D (DZ) questions and answers (printable): common questions

Are these the real Ontario Class D (DZ) test questions?

No. The Ontario Ministry of Transportation (MTO) keeps its question bank private. Every question here is original and written from the The Official MTO Truck Handbook, the material the real test is based on. Understanding the rules, not memorising answers, is what helps on test day.

How do I save the Ontario Class D (DZ) questions and answers as a PDF?

Press the print button and choose Save as PDF instead of a printer. Menus, buttons and ads are hidden when you print, and the answer key starts on a new page after question 50.

How many questions are on the printable sheet?

50, chosen from all 14 topics in our bank of 272 questions. For more, use the online practice tests, which show the correct answer and an explanation after every question.

DZ test questions: 50 printable practice questions with answers